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1 of 20 1.0 features isolated ac/dc offine 100v ac led driver line frequency ranges from 45 hz to 66 hz intelligent wall dimmer detection x leading-edge dimmer x no-dimmer detected x unsupported dimmer hybrid dimming scheme wide dimming range from 1% up to 100% no visible ficker resonant control to achieve high effciency, 85% without dimmer temperature compensated led current small size design x small size input bulk capacitor x small size output capacitor x small transformer primary-side sensing eliminates the need for opto- isolator feedback and simplifes design tight led current regulation 5% fast start-up, typically 10a start-up current hot-plug led module support multiple protection features: x led open circuit protection x single-fault protection x over-current protection x led short circuit protection x current sense resistor short circuit protection x over-temperature protection x input over-voltage protection up to 10w output power 2.0 description the iw3602-00 is a high performance ac/dc offine power supply controller for dimmable led luminaires, which uses advanced digital control technology to detect the dimmer type and phase. the dimmer conduction phase controls the led brightness. the led brightness is modulated by pwm- dimming. the iw3602-00s unique digital control technology eliminates visible ficker. the iw3602-00 can operate with all dimmer schemes including: leading-edge dimmer, as well as other dimmer confgurations such as r-type, or r-l type. when a dimmer is not present, the controller can automatically detect that there is no dimmer. the iw3602-00 operates in a quasi-resonant mode to provide high effciency. the iw3602-00 provides a number of key built-in features. the iw3602-00 uses dialogs advanced primary-side sensing technology to achieve excellent line and load regulation without secondary feedback circuitry. in addition, the iw3602-00s pulse-by-pulse waveform analysis technology allows accurate led current regulation. the iw3602-00 maintains stability over all operating conditions without the need for loop compensation components. therefore, the iw3602-00 minimizes external component count, simplifes emi design and lowers overall bill of materials cost. 3.0 applications dimmable led luminaires optimized for 3w to 10w output power iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
2 of 20 pin # name type pin description 1 output(tr) output gate drive for bleeding mosfet switch 2 v sense analog input auxiliary voltage sense (used for primary side regulation and zvs) 3 v in analog input rectifed ac line voltage sense 4 v t analog input external power limit and shutdown control 5 gnd ground ground 6 i sense analog input primary current sense (used for cycle-by-cycle peak current control and limit) 7 output output gate drive for main mosfet switch 8 v cc power input power supply for control logic and voltage sense for power-on reset circuitry figure 3.1 : iw3602-00 typical application circuit 4.0 pinout description ac input from dimmer v out rtn + u1 iw3602-00 ntc thermistor output(tr) v sense v in vt v cc output i sense gnd 1 2 3 8 7 6 4 5 + bleeding circuit isolated flyback converter + iw3602-00 1 2 3 8 7 6 4 5 v cc v sense v in v t i sense gnd output(tr) output figure 4.1: 8-lead soic-8 package iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
3 of 20 absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. for maximum safe operating conditions, refer to electrical characteristics in section 6.0. 5.0 absolute maximum ratings parameter symbol value units dc supply voltage range (pin 8, i cc = 20ma max) v cc -0.3 to 18 v dc supply current at v cc pin i cc 20 ma output (pin 7) -0.3 to 18 v output(tr) (pin 1) -0.3 to 18 v v sense input (pin 2, i vsense 10 ma) -0.7 to 4.0 v v in input (pin 3) -0.3 to 18 v i sense input (pin 6) -0.3 to 4.0 v v t input (pin 4) -0.3 to 4.0 v power dissipation at t a 25c p d 526 mw maximum junction temperature t jmax 150 c operating junction temperature t jopt -40 to 150 c storage temperature t stg C65 to 150 c thermal resistance junction-to-pcb board surface temperature jb (note 1) 70 c/w junction-to-ambient [still air] ja 160 esd rating per jedec jesd22-a114 2,000 v latch-up test per jesd78a 100 ma notes: note 1. jb [psi junction to board] provides an estimation of the die junction temperature relative to the pcb [board] surface temperature. this data is measured at the ground pin (pin 5) without using any thermal adhesives. for iw3602-00 (with exposed pad), jb = 70c/w. see section 9.13 for more information. iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
4 of 20 parameter symbol test conditions min typ max unit v in section (pin 3) start-up current i inst v in = 10v, c vcc = 10 f 10 15 a input impedance z in t a = 25c 2.5 k w v in range v in 0 1.8 v v sense section (pin 2) input leakage current i in(vsense) v sense = 2v 1 a nominal voltage threshold v sense(nom) t a = 25c, negative edge 1.523 1.538 1.553 v output ovp threshold v sense(max) t a = 25c, negative edge 1.65 1.7 1.75 v output section (pin 7) output low level on-resistance r ds(on)lo i sink = 5ma 30 w output high level on-resistance r ds(on)hi i source = 5ma 150 w rise time (note 2) t r t a = 25c, c l = 330pf 10% to 90% 150 ns fall time (note 2) t f t a = 25c, c l = 330 pf 90% to 10 30 ns maximum switching frequency (note 3) f sw(max) 200 khz v cc section (pin 8) maximum operating voltage v cc(max) 16 v start-up threshold v cc(st) v cc rising 11 12 13 v undervoltage lockout threshold v cc(uvl) v cc falling 7 7.5 8 v operating current i ccq c l = 330pf, v sense = 1.5v 4.1 4.7 ma zener diode clamp voltage v z(clamp) t a = 25c, i z = 5ma 18.5 19 20.5 v i sense section (pin 6) over-current limit threshold v ocp 1.83 1.89 1.95 v i sense short protection reference v rsns 0.16 v cc regulation threshold limit (note 4) v reg-th 1.8 v v t section (pin 4) power limit high threshold (note 4) v p-lim(hi) 0.56 v power limit low threshold (note 4) v p-lim(lo) 0.44 v v cc = 12v, -40c t a 85c, unless otherwise specifed (note 1) 6.0 electrical characteristics iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
5 of 20 6.0 electrical characteristics (cont.) v cc = 12v, -40c t a 85c, unless otherwise specifed (note 1) parameter symbol test conditions min typ max unit shutdown threshold (note 4) v sh-th 0.22 v input leakage current i in(vt) v t = 1.0v 1 a pull-up current source i vt 90 100 110 a output(tr) section (pin 1) output low level on-resistance r ds-tr(on)lo i sink = 5ma 100 output high level on-resistance r ds-tr(on)hi i source = 5ma 200 notes: note 1. adjust v cc above the start-up threshold before setting at 12v. note 2. these parameters are not 100% tested. they are guaranteed by design and characterization. note 3. operating frequency varies based on the line and load conditions, see theory of operation for more details. note 4. these parameters refer to digital preset values. they are not 100% tested. iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
6 of 20 7.0 typical performance characteristics 0.0 0.0 6.0 3.0 9.0 2.0 6.0 10.0 14.0 v cc (v) v cc supply start-up current (a) 4.0 8.0 12.0 figure 7.1 : v cc vs. v cc supply start-up current -50 12.0 -25 25 75 125 ambient temperature (c) v cc start-up threshold (v) 0 50 100 12.2 11.8 11.6 figure 7.2 : start-up threshold vs. temperature -50 -25 25 75 125 ambient temperature (c) % deviation of switching frequency from ideal 0 50 100 0.3 % -0.3 % -0.9 % -1.5 % figure 7.3 : % deviation of switching frequency to ideal switching frequency vs. temperature 1.98 -50 2.00 1.99 2.01 -25 25 75 125 ambient temperature (c) internal reference voltage (v) 0 50 100 figure 7.4 : internal reference vs. temperature iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
7 of 20 8.0 functional block diagram the iw3602-00 combines two functions: 1) wall dimmer type detection and dimmer phase measurement; and 2) output led light dimming. it uses digital control technology, which consists of: 1) chopping circuit, which helps to increase the power factor and serves as a dynamic impedance to load the dimmer; 2) primary side controlled isolated fyback converter. the iw3602-00 provides a low cost dimming solution which enables led bulb to be used with most of the common wall dimmers. this allows led bulbs to directly replace conventional incandescent bulbs with ease. the iw3602 can detect and operate with leading-edge, and trailing-edge dimmers as well as no-dimmer. the controller operates in critical discontinuous conduction mode (cdcm) to achieve high power effciency and minimum emi. it incorporates proprietary primary-feedback constant current control technology to achieve tight led current regulation. figure 3.1 shows a typical iw3602-00 application schematic. figure 8.1 shows the functional block diagram. the advanced digital control mechanism reduces system design time and improves reliability. the start-up algorithm makes sure the v cc supply voltage is ready before powering up the ic. the iw3602-00 provides multiple protection features for current limit, over-voltage protection, and over temperature protection. the v t function can provide over-temperature compensation for the led. the external ntc senses the led temperature. if the v t pin voltage is below v p-lim(hi) , the controller reduces the led current. if the v t pin voltage is below v sh-th then the controller turns off . figure 8.1 : iw3602-00 functional block diagram ? + v in gnd enable v cc 5 v t 4 v sense v fb v vms v ipk output i sense 6 1.89v 0v ~ 1.8v v in_a 0.0v ~ 1.8v i peak v ocp start-up dac ? + 2 3 8 gate driver enable z in 100a 65k 7 dimmer detection and dimmer phase measurement adc mux adc gate driver output(tr) 65k 1 v ovp signal conditioning constant current control iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
8 of 20 pin 6 C i sense primary current sense. used for cycle by cycle peak current control. pin 7 C output gate drive for the external mosfet switch. pin 8 C v cc power supply for the controller during normal operation. the controller starts up when v cc reaches 12v (typical) and shuts down when the v cc voltage is below 7.5 v (typical). high-frequency transients and ripples can be easily generated on the v cc pin due to power supply switching transitions, and line and load disturbances. excess ripples and noises on v cc may cause the iw3602-00 to function undesirably, hence a decoupling capacitor should be connected between the v cc pin and gnd. a ceramic capacitor of minimum 0.1uf connected as close as possible to the v cc pin is suggested. 9.2 wall dimmer detections dimmer detection, or discovery, takes place during the third cycle after start-up. the controller determines whether no dimmer exists, or there is a leading-edge dimmer. a c l i n e b e f o r e w a l l - d i m m e r a c l i n e a f t e r w a l l - d i m m e r figure 9.1 : leading-edge wall dimmer waveforms v cross is internally generated by comparing the digitized v in signal to the threshold of 0.14v. the v in period (t period ) is measured between two consecutive rising edge zero-crossings. t cross is generated by the internal digital block (refer to figure 9.2); when v in_a is higher than 0.14v t cross is set to high and when v in_a falls below 0.14v t cross is reset to zero. if t cross is much shorter than the v in period then a dimmer is detected. using fltered derivatives the 9.0 theory of operation the iw3602-00 is a high performance ac/dc off-line power supply controller for dimmable led luminaires, which uses advanced digital control technology to detect the dimmer type and dimmer phase to control the led brightness. a pwm-dimming scheme is used to modulate the led current with a dimming frequency of 900hz at low dimming levels. iw3602-00 can work with all types of leading-edge dimmers, as well as other dimmer confgurations such as r-type or r-l type without visible ficker. the controller can also work when no dimmer is connected. the iw3602-00 operates in a quasi-resonant mode to provide high effciency and to simplify emi design. in addition, the iw3602-00 includes a number of key built-in protection features. using dialogs state-of-the-art primary- feedback technology, the iw3602-00 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. iw3602-00 also eliminates the need for loop compensation components while maintaining stability over all operating conditions. pulse-by-pulse waveform analysis allows for accurate led current regulation. hence, the iw3602-00 can provide high performance dimming solutions, with minimal external component count and low bill of materials cost. 9.1 pin detail pin 1 C output(tr) gate drive for the bleeding circuit mosfet switch. pin 2 C v sense sense signal input from auxiliary winding. this pin provides the secondary voltage feedback used for output regulation. pin 3 C v in rectifed line voltage sense input. v in is used for dimmer phase detection. the input line voltage is scaled down using a resistor network. it is used for input under-voltage and over-voltage protection. this pin also provides the supply current to the ic during start-up. pin 4 C v t external power limit and shutdown control. if the shutdown control is not used, this pin should be connected to gnd via a resistor. pin 5 C gnd ground. iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
9 of 20 controller decides which type of dimmer is present. a large positive derivative value indicates a leading edge dimmer, then the controller enters the leading-edge dimmer mode; otherwise it enters no dimmer mode. during the dimmer detection stage, the output(tr) is kept high to turn on the switching fet in the bleeding circuit, creating a resistive load for the wall dimmer. 0 . 1 4 v o u t p u t(tr) l e d(en) v l e d v cross v in_a t cross t period figure 9.2 : dimmer detection 9.3 dimmer tracking and phase measurements the dimmer detection algorithm and the dimmer tracking algorithm both depend on an accurate input voltage period measurement. the v in period is measured during the second cycle of the dimmer detection process and is latched for use thereafter. using the measured v in period in subsequent calculations rather than a constant allows for automatic 50/60hz operation and allows for a 10% frequency variation. the phase measurement starts when v in exceeds the rising threshold until v in falls below the falling threshold. v cross t period t cross t 0 0.14 v figure 9.3 : dimmer phase measurement the dimmer phase is calculated as: dimmer phase cross period t t = (9.1) the calculated dimmer phase is used to generate the signal d ratio , which determines led current. if the dimmer phase is less than 0.14 then the d ratio is clamped at 0.14; if the dimmer phase is greater than 0.7 then d ratio is clamped at 1.0; otherwise d ratio is calculated by equation 9.2. 12 dimmer phase ratio d kk = ? (9.2) where, k 1 is set to 1.768 and k 2 is set to 0.238. using v isense(nom) to represent the nominal 100% led current, the v isense , which modulates the output led current, is controlled by: () isense isense nom ratio vv d = (9.3) when d ratio is 1, the converter outputs 100% of nominal power to the led. if d ratio is 0.01, the converter outputs 1% of nominal power to the led. 9.4 bleeding operation ac wall dimmer + br output(tr) v in_a * r 2 r c r 1 d 2 v cb q c c b * r 2 is internal z in of ic r s figure 9.4 : bleeding schematic a bleeding circuit provides the dynamic impedance for the dimmer and builds the energy to the led power converter. it consists of q c , r c , r s , and d 2 . v in pin signal 500 mv/div 3 2 1 time (2.0 ms/div) output(tr) 10.0 v/div t cross 5.0 v/div figure 9.5 : signals of bleeding circuit q c is always on when t cross is low and q c is always off when t cross is high. 9.5 start-up prior to start-up the v in pin charges up the v cc capacitor through a diode between v in and v cc . when v cc is fully charged to a voltage higher than the start-up threshold v cc(st) , the enable signal becomes active and enables the iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
10 of 20 control logic, shown by figure 9.6. when the control logic is enabled, the controller enters the confguration mode, where dimmer type and ac line period are measured. during the confguration mode, which is implemented during the frst 3 half ac cycles, output(tr) is kept high to determine the dimmer type and measure the ac line period. after the confguration mode the constant current stage is enabled and the output voltage starts to ramp up. when the output voltage is above the forward voltage of the led, the controller begins to operate in constant output current mode. an adaptive soft-start control algorithm is applied during start-up state, where the initial output pulses are short and gradually get wider until the full pulse width is achieved. the peak current is limited cycle by cycle by the i peak comparator. v cc v cc(st) enable start-up sequencing v in figure 9.6 : start-up sequencing diagram 9.6 understanding primary feedback figure 9.7 illustrates a simplifed fyback converter. when the switch q 1 conducts during t on (t) , the current i g (t) is directly drawn from the rectifed v g (t) . the energy e g (t) is stored in the magnetizing inductance l m . the rectifying diode d 1 is reversely biased and the load current i o is supplied by the secondary capacitor c o . when q 1 turns off, d 1 conducts and the stored energy e g (t) is delivered to the output. + v in (t) t s (t) i o v o v aux n:1 d1 q1 v aux c o v g (t) i g (t) + ? i in (t) i d (t) figure 9.7 : simplifed flyback converter in order to tightly regulate the output voltage, the information about the output voltage and load current needs to be accurately sensed. in the dcm fyback converter, this information can be read via the auxiliary winding or the primary magnetizing inductance (l m ). during the q 1 on-time, the load current is supplied from the output flter capacitor c o . the voltage across l m is v g (t) , assuming the voltage dropped across q 1 is zero. the current in q 1 ramps up linearly at a rate of: () () gg m di t v t dt l (9.6) at the end of on-time, the current ramps up to: _ () () g on g peak m vt t it l (9.7) this current represents a stored energy of: 2 _ () 2 m g g peak l e it (9.8) when q 1 turns off, i g (t) in l m forces a reversal of polarities on all windings. ignoring the communication-time caused by the leakage inductance l k at the instant of turn-off, the primary current transfers to the secondary at a peak amplitude of: _ () () p d g peak s n it i t n (9.9) assuming the secondary winding is master and the auxiliary winding is slave. v aux 0v v aux = -v in x n aux n p v aux = v o x n aux n s figure 9.8 : auxiliary voltage waveforms the auxiliary voltage is given by: (9.10) and refects the output voltage as shown in figure 9.9. the voltage at the load differs from the secondary voltage by a diode drop and ir losses. the diode drop is a function of () aux aux o s n v vv n iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
11 of 20 current, as are ir losses. thus, if the secondary voltage is always read at a constant secondary current, the difference between the output voltage and the secondary voltage is a fxed v . furthermore, if the voltage can be read when the secondary current is small, for example, at the knee of the auxiliary waveform (see figure 9.9), then v is also small. with the iw3602-00, v can be ignored. the real-time waveform analyzer in the iw3602-00 reads the auxiliary waveform information cycle by cycle. the part then generates a feedback voltage v fb . the v fb signal precisely represents the output voltage and is used to regulate the output voltage. 9.7 valley mode switching in order to reduce switching losses in the mosfet and emi, the iw3602-00 employs valley mode switching during constant output current operation. in valley mode switching, the mosfet switch is turned on at the point where the resonant voltage across the drain and source of the mosfet is at its lowest point (see figure 9.9). by switching at the lowest v ds , the switching loss is minimized. g a t e v d s figure 9.9 : valley mode switching turning on at the lowest v ds generates lowest dv/dt, thus valley mode switching can also reduce emi. to limit the switching frequency range, the iw3602-00 can skip valleys (seen in the frst cycle in figure 9.9) when the switching frequency becomes greater than f sw(max) . at each of the switching cycles, the falling edge of v sense is checked. if the falling edge of v sense is not detected, the off- time is extended until the falling edge of v sense is detected. 9.8 led current regulation the iw3602-00 incorporates a patented primary-side only constant current regulation technology. the iw3602-00 regulates the output current at a constant level regardless of the output voltage, while avoiding continuous conduction mode. to achieve this regulation the iw3602-00 senses the load current indirectly through the primary current. the primary current is detected by the i sense pin through a resistor from the mosfet source to ground. i p i s i o t on t of f t r t s figure 9.10 : constant led current regulation the i sense resistor determines the maximum current output of the power supply. the output current of the power supply is determined by: 1 2 reg th r out ps sense s v t in rt (9.11) where n ps is the turns ratio of the primary and secondary windings and r sense is the i sense resistor. 9.9 v in resistors v in resistors are chosen primarily to scale down the input voltage for the ic. the scale factor for the input voltage in the ic is 0.0086. since the internal impedance of this pin is 2.5 k, then, the v in resistors should equate to: 2.5 2.5 288 0.0086 vin k r kk (9.12) 9.10 voltage protection functions the iw3602-00 includes a function that protects against an input over-voltage (v in ovp) and output over-voltage (ovp). the input voltage is monitored by v in_a , as shown in figure 8.1. if this voltage exceeds 1.73v for 15 continuous half ac cycles the iw3602-00 considers v in to be over-voltage. output voltage is monitored by the v sense pin. if the voltage at this pin exceeds v sense(max) for 2 continuous switching cycles the iw3602-00 considers the output voltage to be over-voltage. in both input over-voltage and output over-voltage cases, the ic remains biased, which discharges the v cc supply. iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
12 of 20 in order to prevent overcharging the output voltage or overcharging the bulk voltage, the iw3602-00 employs an extended discharge time before restart. initially if v cc drops below the uvlo threshold, the controller resets itself and then initiates a new soft-start cycle. under the fault condition, the controller tries to start up for three consecutive times. if all three start-up attempts fail, the controller enters the inactive mode, during which the controller does not respond to v cc power-on requests. the controller is activated again after it sees 29 start-up attempts. the controller can also be reset to the initial condition if v cc is discharged. typically, this extended discharge time is around 3 to 5 seconds. this extended discharge time allows the iw3602-00 to support hot-plug led modules without causing dangerously high output voltages while maintaining a quick recovery. 9.11 pcl, oc and srs protection peak-current limit (pcl), over-current protection (ocp) and sense-resistor short protection (srsp) are features built into the iw3602-00. the i sense pin enables the iw3602-00 to monitor the primary peak current; this allows for cycle by cycle peak current control and limit. when the primary peak current multiplied by the i sense sense resistor is greater than v ocp , ocp engages and the ic immediately turns off the gate drive until the next switching cycle. the output driver continues to send out switching pulses; the ic immediately turns off the gate drive if the ocp threshold is reached again. to ensure that a shorted i sense sense resistor does not cause any unsafe conditions to occur, the srsp feature is enabled after start-up and shuts down the ic within one power supply cycle of the fault occurrence. the v cc is discharged since the ic remains biased. in order to prevent overcharging the output voltage, the iw3602-00 employs an extended discharge time before restart, similar to the discharge time described in section 9.10. 9.12 over-temperature protection if an ntc thermistor is connected from the v t pin to gnd then, the iw3602-00 is able to detect and protect against an over-temperature event (otp). the iw3602-00 provides a current (i vt ) to the v t pin and detects the voltage on the pin. based on this voltage the iw3602-00 can monitor the temperature of the ntc thermistor. as the v t pin voltage reduces, the iw3602-00 reduces the output current according to figure 9.11 and figure 9.12. there is a hysteresis of 84mv on v t pin voltage for each power limiting step. v t pin voltage percentage of nominal output current (%) 0.0 0.2 0.4 0.6 0.8 1.0 0 20 40 60 80 100 v p-lim(hi) v p-lim(lo) v sh-th figure 9.11 : v t pin voltage vs. % of nominal output current v t from 1.0 v to 0.0 v v t pin voltage percentage of nominal output current (%) 0.0 0.2 0.4 0.6 0.8 1.0 0 20 40 60 80 100 v p-lim(hi) v p-lim(lo) v sh-th figure 9.12 : v t pin voltage vs. % of nominal output current v t from 0.0 v to 1.0 v when the v t pin voltage reaches v p-lim(hi) the output current begins to reduce as shown in figure 9.11. at v p-lim(lo) the output current reduces to 1%. the device can be placed in shutdown mode by pulling the v t pin to ground or under v sh-th . 9.13 thermal design note: this section only applies to iw3602-00. the iw3602-00 is typically installed inside a small enclosure, where space and air volumes are constrained. under these circumstances ja (thermal resistance, junction to ambient) measurements do not provide useful information for this type of application. instead we have provided jb which estimates the increase in die junction temperature relative to the pcb surface temperature. figure 9.13 shows the pcb surface temperature is measured at the ics gnd pin pad. iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
13 of 20 gnd pin thermal vias connect top thermal pad to bottom copper thermal epoxy artic silver ic die printed circuit board exposed die pad copper thermal pad under package printed circuit board j b jb pcb top copper trace pcb bottom copper trace figure 9.13 : ways to improve thermal resistance using jb the junction temperature (t j ) of the ic can be found using the equation below. jb j bh ttp (9.13) where, t b is the pcb surface temperature and p h is the power applied to the chip or the product of v cc and i ccq . the iw3602-00 uses an exposed pad package to reduce the thermal resistance of the package. although just by using an exposed package can provide some thermal resistance improvement, more signifcant improvements can be obtained with simple pcb layout and design. figure 9.13 demonstrates some recommended techniques to improve thermal resistance, which are also highlighted below. ways to improve thermal resistance increase pcb area and associated amount of copper interconnect. use thermal adhesive to attach the package to a thermal pad on pcb. connect pcb thermal pad to additional copper on pcb using thermal vias. environment jb no adhesive 70 c/w use thermal adhesive to pad 63 c/w use thermal adhesive to pad with thermal vias 49 c/w table 9.1: improvements in jb based on limited experimentation 5 15 25 pcb area (cm 2 ) jb (?c/watt) 10 20 30 85 65 45 35 75 55 25 ~ 30% effect of thermal resistance improvements a: without thermal adhesive and thermal vias b: with thermal adhesive and thermal vias a b figure 9.14 : effect of thermal resistance improvements figure 9.14 shows improvement of approximately 30% in thermal resistance across different pcb sizes when the exposed pad is attached to pcb using a thermal adhesive and thermal vias connect the pad to a larger plate on the opposing side of the pcb. iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
14 of 20 10.0 performance characteristics leading edge d i m m e r 3 1 4 time (2.0 ms/div) v in pin signal 1.0 v/div ac line current 2.0 a/div ac line 200 v/div figure 10.1 : leading edge dimmer leading edge d i m m e r 3 1 4 time (2.0 ms/div) v in pin signal 1.0 v/div ac line current 2.0 a/div ac line 200 v/div figure 10.2 : leading edge dimmer 2 no d i m m e r ch1 500ma ch3 200v ch4 1.0v 3 1 4 time (2.0 ms/div) v in pin signal 1.0 v/div ac line current 500 ma/div ac line 200 v/div figure 10.3 : no dimmer iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
15 of 20 11.0 typical application schematic figure 11.1 : iw3602-00 typical application schematic ac input from dimmer v out rtn + u1 iw3602-00 ntc output(tr) v sense v in vt v cc output i sense gnd 1 2 3 8 7 6 4 5 + l3 4.7mh r17 4.7k? l1 4.7mh r1 4.7k? f1 1a 250v cx1 0.022f r2 150k? r3 130k? c4 1.0nf r16 100? r6 750? d1 rs1m q2 02n6 c2 6.8 f/200v d3 ss26 c6 47f r15 20k? r13 24k? r14 2.2k? d2 1n4148 6.2? r11 q1 02n6 br1 mb8s q3 f501 r7 68k? r8 68k? 1w + c5 4.7f 4.7? r12 c7 100pf 1k? r10 100? r9 47k? 25v r19 150k? r18 150k? 275v r16b 100? 25v c8 10nf z1 15v iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
16 of 20 12.0 physical dimensions figure 12.1 : physical dimensions for iw3602-00 compliant to jedec standard ms12f controlling dimensions are in inches; millimeter dimensions are for reference only this product is rohs compliant and halide free. soldering temperature resistance: [a] package is ipc/jedec std 020d moisture sensitivity level 3 [b] package exceeds jedec std no. 22-a111 for solder immersion resistance; package can withstand 10 s immersion < 260?c dimension d does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 mm per end. dimension e does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 mm per side. the package top may be smaller than the package bottom. dimensions d and e are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 8-lead small outline (soic) package coplanarity 0.10 (0.004) 8 5 4 1 seating plane a1 e h b d e a c l 5 8 1 4 n m exposed pad top view bottom view side views inches symbol millimeters min 0.0020 a1 max min max 0.0060 0.05 0.150 0.051 a 0.067 1.30 1.70 0.014 b 0.019 0.36 0.48 0.007 c 0.010 0.18 0.25 0.189 d 0.197 4.80 5.00 0.150 e 0.157 3.81 3.99 0.050 bsc e 1.27 bsc 0.228 h 0.244 5.79 6.20 0.086 n 0.094 2.18 2.39 0.016 l 0.050 0.41 1.27 0 8 m 3.20 3.00 0.118 0.126 iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
17 of 20 figure 12.2 : physical dimensions for IW3602-30 part number options package description iw3602-00 universal input < 0.7pf soic-8-ep 2 tape & reel 1 IW3602-30 universal input < 0.7pf, improved bleeder, lower cost package soic-8 tape & reel 1 note 1: tape & reel packing quantity is 2,500/reel. minimum ordering quantity is 2,500. note 2: for the exposed pad package, refer to section 9.13 thermal design. 13.0 ordering information compliant to jedec standard ms12f controlling dimensions are in inches; millimeter dimensions are for reference only this product is rohs compliant and halide free. soldering temperature resistance: [a] package is ipc/jedec std 020d moisture sensitivity level 1 [b] package exceeds jedec std no. 22-a111 for solder immersion resistance; package can withstand 10 s immersion < 260?c dimension d does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 mm per end. dimension e does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 mm per side. the package top may be smaller than the package bottom. dimensions d and e are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 8-lead small outline (soic) package coplanarity 0.10 (0.004) 8 5 4 1 seating plane a1 e h b d e a c l top view side views inches symbol millimeters min 0.0020 a1 max min max 0.0060 0.05 0.150 0.051 a 0.067 1.30 1.70 0.014 b 0.019 0.36 0.48 0.007 c 0.010 0.18 0.25 0.189 d 0.197 4.80 5.00 0.150 e 0.157 3.81 3.99 0.050 bsc e 1.27 bsc 0.228 h 0.244 5.79 6.20 0.086 n 0.094 2.18 2.39 0.016 l 0.050 0.41 1.27 0 8 m 3.20 3.00 0.118 0.126 iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet
disclaimer information in this document is believed to be accurate and reliable. however, dialog semiconductor does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information. dialog semiconductor furthermore takes no responsibility whatsoever for the content in this document if provided by any information source outside of dialog semiconductor . dialog semiconductor reserves the right to change without notice the information published in this document, including without limitation the specifcation and the design of the related semiconductor products, software and applications. applications, software, and semiconductor products described in this document are for illustrative purposes only. dialog semiconductor makes no representation or warranty that such applications, software and semiconductor products will be suitable for the specifed use without further testing or modifcation. unless otherwise agreed in writing, such testing or modifcation is the sole responsibility of the customer and dialog semiconductor excludes all liability in this respect. customer notes that nothing in this document may be construed as a license for customer to use the dialog semiconductor products, software and applications referred to in this document. such license must be separately sought by customer with dialog semiconductor . all use of dialog semiconductor products, software and applications referred to in this document are subject to dialog semiconductors standard terms and conditions of sale , unless otherwise stated. ? dialog semiconductor (uk) ltd. all rights reserved. rohs compliance dialog semiconductor complies to european directive 2001/95/ec and from 2 january 2013 onwards to european directive 2011/65/eu concerning restriction of hazardous substances (rohs/rohs2). dialog semiconductors statement on rohs can be found on the customer portal https://support.diasemi.com/ . rohs certifcates from our suppliers are available on request. 18 of 20 contacting dialog semiconductor united kingdom dialog semiconductor (uk) ltd phone: +44 1793 757700 germany dialog semiconductor gmbh phone: +49 7021 805-0 the netherlands dialog semiconductor b.v. phone: +31 73 640 88 22 email info_pcbg@diasemi.com north america dialog semiconductor inc. phone: +1 408 845 8500 japan dialog semiconductor k. k. phone: +81 3 5425 4567 taiwan dialog semiconductor taiwan phone: +886 8178 6222 web site: www.dialog-semiconductor.com singapore dialog semiconductor singapore phone: +65 64849929 hong kong dialog semiconductor hong kong phone: +852 2607 4271 korea dialog semiconductor korea phone: +82 2 3469 8200 china dialog semiconductor (shenzhen) phone: +86 755 2981 3669 dialog semiconductor (shanghai) phone: +86 21 5178 2561 iw3602-00 ac/dc digital power controller for dimmable led drivers rev. 0.8 preliminary iw3602-00 ? 2014 dialog semiconductor (uk) ltd. datasheet

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