View SG5841DZ_4158550.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 1 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 features ? green-mode pwm controller ? low start-up current (14a) ? low operating current (4ma) ? programmable pwm frequency with hopping ? peak-current-mode control ? cycle-by-cycle current limiting ? synchronized slope compensation ? leading-edge blanking ? constant output power limit ? totem pole output with soft driving ? v dd over-voltage clamping ? programmable over-temperature protection (otp) ? internal open-loop protection ? v dd under-voltage lockout (uvlo) ? gate output maximum voltage clamp (18v) applications general-purpose switch-mode power supplies and flyback power converters, including: ? power adapters ? open-frame smps description the highly integrated sg5841/j series of pwm controllers provides several features to enhance the performance of flyback converters. to minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency at light-load conditions. this green-mode function enables the power supply to meet international power conservation requirements. to further reduce power consumption, sg5841/j is manufactured using the bicmos process. this allows a low start-up current, around 14a, and an operating current of only 4ma. as a result, a large start-up resistance can be used. the sg5841/j built-in synchronized slope compensation achieves stable peak-current-mode control. the proprietary internal sawtooth power-limiter ensures constant output power limit over a wide range of ac input voltages, from 90vac to 264vac. sg5841/j provides many protection functions. in addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety should an open-loop or output-short-circuit failure oc cur. pwm output is disabled until v dd drops below the uvlo lower limit, then the controller starts again. an external ntc thermistor can be applied for over-temperature protection. sg5841/j is available in an 8-pin dip or sop package. typical application sg5841/j
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 2 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 marking diagrams pin configuration ordering information part number frequency hopping pb-free pack age sg5841jsz yes 8-pin sop sg5841jdz yes 8-pin dip sg5841sz no 8-pin sop SG5841DZ no 8-pin dip pin descriptions pin no. symbol function description 1 gnd ground ground. 2 fb feedback the signal from the external compensation circuit is fed into this pin. the pwm duty cycle is determined in response to the signal from this pin and the current-sense signal from pin 6. if fb voltage exceeds the threshold, the internal protection circuit disables pwm output after a predetermined delay time. 3 vin start-up input for start-up, this pin is pulled high to the rectified line input via a resistor. since the start-up current requirement of the sg5841/j is very small, a large start-up resistance can be used to minimize power loss. 4 ri reference setting a resistor connected from the ri pin to gnd pin provides the sg5841 /j with a constant current source. this determines the center pwm frequency. increasing the resistance reduces pwm frequency. using a 26k ? resistor results in a 65khz center pwm frequency. 5 rt temperature detection for over-temperature protection. an external ntc thermistor is connected from this pin to the gnd pin. the impedance of the ntc decreases at high temperatures. once the voltage of the rt pin drops below a fixed limit, pwm output is disabled. 6 sense current sense current sense. the sensed voltage is used for peak-current-mode control and cycle-by-cycle current limiting. 7 vdd power supply power supply. if v dd exceeds a threshold, the internal protection circuit disables pwm output. 8 gate driver output the totem-pole output driver for the power mosfet, which is internally clamped below 18v. h: j = with frequency hopping null = without frequency hopping t : d = dip, s = sop p: z = lead free null=regular package xxxxxxxx : wafer lot y : year; ww : week v : assembly location xxxxxxxxywwv ri vin gate vdd sense rt gnd fb sg5841htp
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 3 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 block diagram 5841j only
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 4 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 absolute maximum ratings symbol parameter value unit v vdd supply voltage 30 v v vin input terminal 30 v v fb input voltage to fb pin -0.3 to 7.0 v v sense input voltage to sense pin -0.3 to 7.0 v v rt input voltage to rt pin -0.3 to 7.0 v v ri input voltage to ri pin -0.3 to 7.0 v dip 800.0 p d power dissipation (t a < 50c ) sop 400.0 mw dip 82.5 r ja thermal resistance (junction-to-air) sop 141.0 c/w dip 59.7 r jc thermal resistance (junction-to-case) sop 80.8 c/w t j operating junction temperature -40 to +125 c t stg storage temperature range -55 to +150 c t l lead temperature (wave soldering or infrared, 10 seconds) 260 c v esd,hbm electrostatic discharge capability, human body model 3.0 kv v esd,mm electrostatic discharge capability, machine model 250 v * all voltage values, except differential voltages, are given with respect to gnd pin. * stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. recommended operating conditions symbol parameter value unit t a operating ambient temperature -20 to +85 c * for proper operation. electrical characteristics v dd = 15v, t a = 25c, unless otherwise noted. v dd section symbol parameter test condition min. typ. max. unit v dd-op continuously operating voltage 24.7 v v dd-on start threshold voltage 15 16 17 v v dd-off minimum operating voltage 9 10 11 v i dd-st start-up current v dd =v dd-on ?0.16v 14 30 a i dd-op operating supply current v dd =15v, r i =26k ? , gate=open 4 5 ma v dd-clamp v dd over-voltage-clamping level 28 29 v t d-vddclamp v dd over-voltage-clamping debounce time r i =26k ? 50 100 200 s r i section symbol parameter test condition min. typ. max. unit ri nor r i operating range 15.5 36.0 k ? ri max maximum r i value for protection 230 k ? ri min minimum r i value for protection 10 k ?
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 5 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 oscillator section symbol parameter test condition min. typ. max. unit center frequency r i =26k ? 62 65 68 f osc normal pwm frequency hopping range r i =26k ? (5841j only) 3.7 4.2 4.7 khz t hop hopping period r i =26k ? (5841j only) 3.9 4.4 4.9 ms f osc-g green-mode frequency r i =26k ? 18 22 25 khz f dv frequency variation vs. v dd deviation v dd =11.5v to 24.7v 5 % f dt frequency variation vs. temperature deviation t a =-20 to +85 c 5 % feedback input section symbol parameter test condition min. typ. max. unit a v fb input to current comparator attenuation 1/3.75 1/3.20 1/2.75 v/v z fb input impedance 4 7 k ? v fb-open fb output high voltage fb pin open 5 6 v v fb-olp fb open-loop trigger level 4.2 4.5 4.8 v t d-olp delay time of fb pin open-loop protection r i =26k ? 26 29 32 ms v fb-n green-mode entry fb voltage r i =26k ? 1.9 2.1 2.3 v v fb-g green-mode ending fb voltage r i =26k ? v fb-n -0.5 v current-sense section symbol parameter test condition min. typ. max. unit z sense input impedance 12 k ? v sthfl current limit flatten threshold voltage 0.85 0.90 0.95 v v sthva current limit valley threshold voltage v sthfl ?v sthva 0.22 v t pd propagation delay to gate output r i =26k ? 150 200 ns t leb leading-edge blanking time r i =26k ? 200 270 350 ns
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 6 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 gate section symbol parameter test condition min. typ. max. unit dcy max maximum duty cycle 60 65 70 % v gate-l output voltage low v dd =15v, i o =50ma 1.5 v v gate-h output voltage high v dd =12.5v, i o =50ma 7.5 v tr rising time v dd =15v, c l =1nf 150 250 350 ns tf falling time v dd =15v, c l =1nf 30 50 90 ns i o peak output current v dd =15v, gate=6v 230 ma v gate-clamp gate output clamping voltage v dd =24.7v 18 19 v rt section symbol parameter test condition min. typ. max. unit i rt output current of rt pin r i =26k ? 92 100 108 a v rtth trigger voltage for over-temperature protection 0.585 0.620 0.655 v v rt-rls otp release voltage v rtth +0.03 v t d-otp over-temperature debounce r i =26k ? 60 100 140 s
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 7 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 typical characteristics s tart-up c urrent (i dd-s t ) vs temperature 10 14 18 22 26 30 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature ( ) i dd-s t (ua ) o perating s upply c urrent (i dd-op ) vs temperature 2.5 3.0 3.5 4.0 4.5 5.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature ( ) i dd-op (ma ) operation current (i dd-op ) vs v dd v oltage 0 3 6 9 12 15 11 13 15 17 19 21 23 25 27 29 vdd voltage (v) i dd-op (ma ) start threshold voltage (v dd-on ) vs temperature 15.0 15.5 16.0 16.5 17.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature ( ) v dd-on (v ) m in. o perating v oltage (v dd-off ) v s t emperature 9.0 9.5 10.0 10.5 11.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature ( ) v dd-off (v ) p wm f requenc y (f os c ) vs t emperature 62 63 64 65 66 67 68 -40-25-10 5 203550658095110125 temperature ( ) fosc (khz) gate = 1000pf gate = open
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 8 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 max. duty c ycle (dc y max. ) vs t e mpe ra ture 60 62 64 66 68 70 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature ( ) dcy ma x. (%) t rigge r v olta ge for o ve r-te mpe ra ture p rote c tion (v rtth ) vs temperature 0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.65 0.66 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature ( ) v (rtth) (v) output c urrent of rt pin (i rt ) vs t e mpe ra ture 92 96 100 104 108 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature ( ) i rt (ua )
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 9 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 operation description start-up current typical start-up current is only 14a, so that a high resistance and low-wattage start-up resistor can be used to minimize power loss. for an ac/dc adapter with universal input range, a 1.5m ? , 0.25w start-up resistor and a 10f/25v v dd hold-up capacitor are enough for this application. operating current operating current is around 4ma. the low operating current enables better efficiency and reduces the requirement of v dd hold-up capacitance. green-mode operation the proprietary green-mode function provides off-time modulation to continuously decrease the pwm frequency under light-load conditions. to avoid acoustic noise problems, the minimum pwm frequency is set above 22khz. this green-mode function dramatically reduces power consumption under light-load and zero-load conditions. power supplies using a sg5841/j controller can meet even the most restrictive international regulations regarding standby power consumption. oscillator operation a resistor connected from the ri pin to the gnd pin generates a constant current source for the sg5841/j controller. this current is used to determine the center pwm frequency. increasing the resistance reduces pwm frequency. using a 26k resistor, r i , results in a corresponding 65khz pwm frequency. the relationship between r i and the switching frequency is: (khz) 1690 ) (k r i = pwm f ---------------------------- (1) the range of the pwm oscillation frequency is designed as 47khz ~ 109khz. sg5841j also integrates frequency hopping function internally. the frequency variation ranges from around 62khz to 68khz for a center frequency of 65khz. the frequency hopping function helps reduce emi emission of a power supply with minimum line filters. current sensing / pwm current limiting peak-current-mode control is utilized in sg5841/j to regulate output voltage and provide pulse-by-pulse current limiting. the switch current is detected by a sense resistor into the sense pin. the pwm duty cycle is determined by this current sense signal and the feedback voltage. when the voltage on the sense pin reaches around v comp = (v fb ?1.0)/3.2, a switch cycle is terminated immediately. v comp is internally clamped to a variable voltage around 0.85v for output power limit. leading-edge blanking each time the power mosfet is switched on, a turn-on spike occurs at the sense-resistor. to avoid premature termination of the switching pulse, a leading-edge blanking time is built in. during this blanking period, the current-limit comparator is disabled and cannot switch off the gate drive. under-voltage lockout (uvlo) the turn-on and turn-off thresholds of sg5841/j are fixed internally at 16v/10v. during start-up, the hold-up capacitor must be charged to 16v through the start-up resistor for the ic to be enabled. the hold-up capacitor continues to supply v dd before the energy can be delivered from auxiliary winding of the main transformer. v dd must not drop below 10v during this start-up process. this uvlo hysteresis window ensures that hold-up capacitor is adequate to supply v dd during start-up. gate output / soft driving the sg5841/j bicmos output stage is a fast totem pole gate driver. cross conduction has been avoided to minimize heat dissipation, increase efficiency, and enhance reliability. the output driver is clamped by an internal 18v zener diode to protect power mosfet transistors against undesirable gate over-voltage. a soft driving waveform is implemented to minimize emi. built-in slope compensation the sensed voltage across the current-sense resistor is used for peak-current-mode control and pulse-by-pulse current limiting. built-in slope compensation improves stability or prevents sub-harmonic oscillation. sg5841/j inserts a synchronized, positive-going ramp at every switching cycle.
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 10 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 constant output power limit when the sense voltage across the sense resistor, r s , reaches the threshold voltage, around 0.85v, the output gate drive is turned off after delay t pd . this delay introduces additional current, proportional to t pd ? v in / l p . the delay is nearly constant regardless of the input voltage v in . higher input voltage results in larger additional current and the output power limit is higher than under low input line voltage. to compensate this variation for a wide ac input range, a sawtooth power-limiter (saw limiter) is designed to solve the unequal power-limit problem. the saw limiter is designed as a positive ramp signal (v limit_ramp ) and fed to the inverting input of the ocp comparator. this results in a lower current limit at high-line inputs than at low-line inputs. v dd over-voltage clamping v dd over-voltage clamping has been built in to prevent damage due to abnormal conditions. once the v dd voltage is over the v dd over-voltage clamping voltage (v dd-clamp ) and lasts for t d-vddclamp , the pwm pulses are disabled until the v dd voltage drops below the v dd over-voltage clamping voltage. thermal protection an ntc thermistor r ntc in series with a resistor r a can be connected from pin rt to ground. a constant current i rt is output from pin rt. the voltage on the rt pin can be expressed as v rt = i rt (r ntc + r a ), in which i rt = 2 x (1.3v / r i ). at high ambient temperature, r ntc is smaller, such that v rt decreases. when v rt is less than 0.62v, the pwm is completely turned off. limited power control the fb voltage increases every time the output of the power supply is shorted or over loaded. if the fb voltage remains higher than a built-in threshold longer than t d-olp , pwm output is turned off. as pwm output is turned off, the supply voltage v dd begins decreasing. when v dd goes below the turn-off threshold (e.g., 10v) the controller is totally shut down. v dd is charged up to the turn-on threshold voltage of 16v through the start-up resistor until pwm output is restarted. this protection feature remains activated as long as the over-loading condition persists. this prevents the power supply from overheating due to over loading conditions. noise immunity noise on the current sense or control signal may cause significant pulse width jitter, particularly in the continuous-conduction mode. slope compensation helps alleviate this problem. good placement and layout practices should be followed. avoiding long pcb traces and component leads, locating compensation and filter components near to the sg5841/j, and increasing the power mos gate resistance improves performance. ) (k i r 115 . 1 olp - d (ms) t = ----------------- (2)
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 11 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 reference circuit 1 2 3 cn1 r5 f1 c2 2 1 + c4 r7 r1 c3 2 1 3 4 bd1 2 1 d2 1 2 3 q2 r8 gnd 1 fb 2 vin 3 ri 4 rt 5 sense 6 vdd 7 gate 8 u1 sg5841/j 1 2 4 3 u2 c6 r4 1 3 2 q1 2 1 + c7 2 1 d4 r9 r16 r13 r15 r14 r11 c10 2 1 + c9 vz1 c1 1 2 3 4 l2 c11 r2 t1 r10 ther2 r3 c5 1 2 3 4 l1 r12 2 1 + c8 2 1 d3 a k r u3 vo+ 1 2 l3 tr1 d1 r6 vo+ c12 bom reference component reference component bd1 bd 4a/600v q2 mos 7a/600v c1 xc 0.68f/300v r1,r2 r 1mohm 1/4w c2 xc 0.1f/300v r3 r 100kohm 1/2w c3 cc 0.01f/500v r4 r 47ohm 1/4w c4 ec 120/400v r5,r7 r 750kohm 1/4w c5 yc 222p/250v r6 r 2kohm 1/8w c6 cc 1000pf/100v r8 r 0.3ohm 2w c7 ec 1000f/25v r9 r 33kohm 1/8w c8 ec 470f/25v r10 r 4.7kohm 1/8w 1% c9 ec 10f/50v r11 r 470ohm 1/8w c10 cc 222pf/50v r12 r 0 ohm 1/8w c11 cc 470pf/50v r13 r 4.7kohm 1/8w c12 cc 102pf/50v(option) r14 r 154kohm 1/8w d1 led r15 r 39kohm 1/8w d2 diode byv95c r16 r 100ohm 1/8w d3 tvs p6ke16a ther2 thermistor ttc104 d4 diode fr103 t1 transformer (600h-pq2620) f1 fuse 4a/250v u1 ic sg5841/j l1 choke (900h) u2 ic pc817 l2 choke (10mh) u3 ic tl431 l3 inductor (2h) vz1 vz 9g q1 diode 20a/100v
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 12 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 package information 8pins-dip (d) 4 1 85 d e1 e e b a1 a2 a b b1 l e x dimensions millimeters inches symbol min. typ. max. min. typ. max. a 5.334 0.210 a1 0.381 0.015 a2 3.175 3.302 3.429 0.125 0.130 0.135 b 1.524 0.060 b1 0.457 0.018 d 9.017 9.271 10.160 0.355 0.365 0.400 e 7.620 0.300 e1 6.223 6.350 6.477 0.245 0.250 0.255 e 2.540 0.100 l 2.921 3.302 3.810 0.115 0.130 0.150 eb 8.509 9.017 9.525 0.335 0.355 0.375 ? 0 ? 7 ? 15 ? 0 ? 7 ? 15 ?
product specification highly integrated green-mode pwm controller sg5841/j ? system general corp. - 13 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007 8pins-sop(s) 1 4 8 5 h e e b a a1 d c f l dimensions millimete r inch symbol min. t yp .max.min.t yp .max. a 1.346 1.752 0.053 0.069 a 1 0.101 0.254 0.004 0.010 b 0.406 0.016 c 0.203 0.008 d 4.648 4.978 0.183 0.196 e 3.810 3.987 0.150 0.157 e 1.016 1.270 1.524 0.040 0.050 0.060 f 0.381x45 0.015x45 h 5.791 6.197 0.228 0.244 l 0.406 1.270 0.016 0.050 ? 0 8 0 8
product specification highly-integrated green-mode pwm controller sg5841/j ? system general corp. - 14 - www.sg.com.tw ? www.fairchildsemi.com version 1.3.1 (iao33.0017.b6) september 20, 2007

▲Up To Search▲

Price & Availability of SG5841DZ

	To Download SG5841DZ Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .