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september 2012 ? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 fan6862w ? highly integrated green-mode pwm controller fan6862w highly integrated green-mode pwm controller features ? low standby power: under 0.1 w ? low startup current: 8 a ? low operating current in green mode: 600 a ? peak-current mode operation with cycle-by-cycle current limiting ? pwm frequency continuously decreasing with burst mode at light loads ? v dd over-voltage protection (ovp) ? constant output power limit (full ac input range) ? internal latch circuit (fan6862wl) for ovp, otp ? fixed pwm frequency (65 khz) with frequency hopping ? feedback open-loop protection: 60 ms delay ? gate output maximum voltage clamp: 13.5v ? soft-start time: 5 ms ? soft driving for emi improvement ? full range frequency hopping ? internal otp sensor with hysteresis ? gate driving capability: 400 ma applications general-purpose switched-mode power supplies and flyback power converters, including: ? power adapters ? open-frame smps ? smps with surge-current output, such as for printers, scanners, motor drivers description a highly integrated pwm controller, fan6862w provides several features to enhance the performance of flyback converters. to minimize standby power consumption, a proprietary green mode provides off- time modulation to continuously decrease the switching frequency under light-load conditions. under zero-load conditions, the power supply enters burst mode, which completely shuts off pwm out put. output restarts just before the supply voltage drops below the uvlo lower limit. green mode enables power supplies to meet international power conservation requirements. the fan6862w is designed for smps and integrates a frequency-hopping function t hat helps to reduce emi emission of a power supply with minimum line filters. to compensate the power limit variation over universal input range, a bias current limit (v limit ) adaptively keeps the power limit subs tantially constant. the gate output is clamped at 13.5 v to protect the external mosfet from over-voltage damage. other protection functions include v dd over-voltage protection (ovp), and over-t emperature protection (otp). for otp, an external ntc thermistor can be applied to sense the ambient temperature. when v dd ovp or otp is activated, an internal latch circuit latches off the controller. protection types are shown in table 1. table 1. protection type part number ovp olp otp / otp2 fan6862w latch a/r latch fan6862wl latch latch latch fan6862wr a/r a/r a/r ordering information part number operating temperature range package packing method fan6862wty -40 to +105c 6-lead, sot23, jedec mo-178 vari ation ab, 1.6 mm wide tape & reel FAN6862WLTY fan6862wrty
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 2 fan6862w ? highly integrated green-mode pwm controller typical application figure 1. typical application block diagram figure 2. block diagram
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 3 fan6862w ? highly integrated green-mode pwm controller marking information figure 3. top mark pin configuration figure 4. pin configuration pin definitions pin # name function description 1 gnd ground ground 2 fb feedback the fb pin provides the output voltage regulation signal. it provides feedback to the internal pwm comparator, so the pwm comparator can control the duty cycle. this pin also provides over-current protection. if v fb is higher than the trigger level and persists at that leve l, the controller stops and restarts. 3 rt temperature detection an external ntc thermistor is connect ed from this pin to the gnd pin. the impedance of the ntc decreases at high te mperatures. if the voltage of the rt pin drops below the threshold, pwm output is disabled. 4 sense current sense this pin senses the voltage across a resistor. when the voltage reaches the internal threshold, pwm output is disa bled and this activates over-current protection. this pin also provides current amplitude information for current mode control. 5 vdd power supply power supply 6 gate driver output the totem-pole output driver for driving the power mosfet axx: aby: fan6862wty abz: fan6862wrty aca: FAN6862WLTY tt: wafer lot code ???? : year code _ _ _ : week code
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 4 fan6862w ? highly integrated green-mode pwm controller absolute maximum ratings stresses exceeding the absolute maximum ratings may dam age the device. the device may not function or be operable above the recommended operating conditions and stressi ng the parts to these levels is not recommended. in addition, extended exposure to stresses above the recomm ended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. all vo ltage values, except differential voltages, are given with respect to gnd pin. symbol parameter min. max. unit v dd supply voltage 30 v v l input voltage to fb, sense, and rt pins -0.3 7.0 v ja thermal resistance (junction-to-ambient) 244 c/w t j operating junction temperature -40 +125 c t stg storage temperature range -55 +150 c t l lead temperature, wave soldering, 10 seconds +260 c esd human body model, jesd22-a114 5.5 kv charge device model, jesd22-c101 2.0 recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ens ure optimal performance to the datasheet specificatio ns. fairchild does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter min. max. unit t a operating ambient tem perature -40 +105 c
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 5 fan6862w ? highly integrated green-mode pwm controller electrical characteristics v dd = 15 v and t a = 25c, unless otherwise noted. symbol parameter condition min. typ. max. unit v dd section v dd-op continuously operating voltage 20 v v dd-on turn-on threshold voltage 15 16 17 v v dd-off turn-off voltage 6.5 7.0 7.5 v v dd-lh threshold voltage for latch-off release fan6862w, fan6862wl only 4 v i dd-st startup current v dd-on ? 0.16 v 8 15 a i dd-op1 operating supply current in pwm operation v dd = 20 v, v fb = 3 v gate open 2 ma i dd-op2 operating supply current when v fb < v fb-zdc v dd = 15 v, v fb < v fb-zdc 600 a v dd-ovp v dd over-voltage protection fan6862wl-latch, fan6862wr-auto restart 21.0 22.2 23.5 v t d-vddovp v dd ovp debounce time 50 s i dd-lh latch-off holding current v dd = 5 v; fan6862w, fan6862wl only 70 80 a feedback input section a v input-voltage to current-sense a ttenuation 1/4.0 1/3.5 1/3.0 v/v z fb input impedance 17 k ? v fb-open fb pin open voltage 5.2 5.4 5.6 v v fb-olp threshold voltage for open-loop protection 4.3 4.6 4.9 v t d-olp open-loop protection delay v fb > v fb-olp, t on > 2.5 s, t a = -40 to +105c 54 60 66 ms t d-scp secondary short-circuit protection delay fb > v fb-olp , t on < 2.5 s, t a = -40 to +105c 6 7 8 ms t on-scp short-circuit protection on-time detection v fb >v fb-olp , t a = -40 to +105c 2.5 s current sense section t pd delay to output 100 250 ns t leb leading-edge blanking time 200 250 ns v limit-h high threshold voltage for current limit duty>55% 0.57 0.60 0.63 v v limit-l low threshold voltage for current li mit duty = 0% 0.36 0.39 0.42 v t soft-start period during startup time star tup time 4.75 5.00 10.00 ms continued on the following page?
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 6 fan6862w ? highly integrated green-mode pwm controller electrical characteristics (continued) v dd = 15 v and t a = 25c, unless otherwise noted. symbol parameter condition min. typ. max. unit oscillator section f osc normal pwm frequency center frequency v fb > v fb-n 60 65 68 khz hopping range v fb v fb-n 4.0 v fb = v fb-g (1) 2.9 t hop-1 hopping period 1 (1) v fb v fb-n 4.4 ms t hop-3 hopping period 3 (1) v fb = v fb-g 11.5 ms f osc-g green mode minimum frequency 18 22 26 khz v fb-n fb threshold voltage for frequency reduction 2.35 2.50 2.65 v v fb-g fb voltage at f osc-g 2.05 2.20 2.30 v v fb-zdc fb threshold voltage for zero-duty 1.6 v v fb-zdcr - v fb-zdc zdc hysteresis 0.15 v f dv frequency variation vs. v dd deviation v dd = 7.5 v to 21 v 0.5 2.0 % f dt frequency variation vs. temperature deviation (1) t a = -40 to +105c 2 % continued on following page? figure 5. pwm frequency pwm frequency f osc f osc-g v fb-n v fb-g v fb-zdc v fb v fb-zdcr
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 7 fan6862w ? highly integrated green-mode pwm controller electrical characteristics (continued) v dd = 15 v and t a = 25c, unless otherwise noted. symbol parameter condition min. typ. max. unit pwm output section dcy max maximum duty cycle 60 70 75 % v ol output voltage low v dd = 15 v, i o = 50 ma 1.5 v v oh output voltage high v dd = 8 v, i o = 50 ma 6 v t r rising time (with soft driving) gate = 1 nf 150 ns t f falling time gate = 1 nf 35 ns v clamp gate output clamping voltage v dd = 20 v 12.0 13.5 15.0 v i o-source gate source driving capability (1) v dd = 15 v 400 ma i o-sink gate sink driving capability (1) v dd = 15 v 400 ma over-temperature protection (otp) section r rt maximum external resistance of rt pin to trigger protection 9 10 11 k ? v otp threshold voltage for over-temperature protection fan6862w, fan6862wl-latch, fan6862wr-auto restart, at 25c 0.94 1.00 1.06 v i rt output current of rt pin 92 100 108 a t dotp over-temperature debounce time v fb =v fb-n 14 17 19 ms v otp2 second threshold voltage for over- temperature protection fan6862w, fan6862wl-latch, fan6862wr-auto restart, at 25c 0.65 0.70 0.75 v t dotp2 second over-temperature debounce time 80 135 200 s t otp protection junction temperature (1,2) +135 c t restart restart junction temperature (1,3) t otp - 25 c notes : 1. guarantee by design. 2. when activated, the output is disabled and the latch is turned off. 3. the threshold temperature for enablin g the output again and resetting the latch after otp has been activated.
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 8 fan6862w ? highly integrated green-mode pwm controller typical performance characteristics figure 6. turn-on threshold voltage (v dd-on ) vs. temperature figure 7. turn-off threshold voltage (v dd-off ) vs. temperature figure 8. operating current (i dd-op2 ) vs. temperature figure 9. v dd ove r - v oltage protection (v dd-ovp ) vs. temperature figure 10. center frequency ( f osc ) vs. temperature figure 11. fb threshold v oltage f or frequency reduction (v fb-n ) vs. temperature
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 9 fan6862w ? highly integrated green-mode pwm controller typical performance characteristics (continued) figure 12. fb voltage at f osc-g (v fb-g ) vs. temperature figure 13. threshold v oltage fo r open-loop protection (v fb-olp ) vs. temperature figure 14. open-loop protection delay (t d-olp ) vs. temperature figure 15. flat threshold voltage for current limit (v limit-h ) vs. temperature figure 16. v alley threshold voltage for current limit (v limit-l ) vs. temperature figure 17. gate output clamping voltage ( v clamp ) vs. temperature
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 10 fan6862w ? highly integrated green-mode pwm controller typical performance characteristics (continued) figure 18. maximum duty cycle (dcy max ) vs. temperature figure 19. leading-edge blanking time (t leb ) vs. temperature figure 20. rising time (t r ) vs. temperature figure 21. falling time (t f ) vs. temperature figure 22. output current of rt pin (i rt ) vs. temperature figure 23. maximum external resistance of rt pin to trigger protection (r rt ) vs. temperature
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 11 fan6862w ? highly integrated green-mode pwm controller operation description startup operation figure 24 shows a typical startup circuit and transformer auxiliary winding for a typical application. before switching operation begins, fan6862w consumes only startup current (typically 8 a) and the current supplied through the startup re sistor charges the v dd capacitor (c dd ). when v dd reaches turn-on voltage of 16 v (v dd- on ), switching begins and the current consumed increases to 2 ma. power is then supplied from the transformer auxiliary winding. the large hysteresis of v dd (7 v) provides more holdup time, which allows using a small capacitor for v dd . the startup resistor is typically connected to ac line for a fast reset of latch protection. figure 24. startup circuit green-mode operation the fan6862w uses feedback voltage (v fb ) as an indicator of the output load and modulates the pwm frequency, as shown in figure 25, such that the switching frequency decreases as load decreases. in heavy-load conditions, the switching frequency is 65 khz. once v fb decreases below v fb-n (2.5 v), the pwm frequency starts to linearly decrease from 65 khz to 22.5 khz to reduce the switching losses. as v fb decreases below v fb-g (2.2 v), the switching frequency is fixed at 22.5 khz and fan6862w enters ?deep? green mode, where the operating current decreases to 600 a (maximum), further reducing the standby power consumption. as v fb decreases below v fb-zdc (1.6v), fan6862w enters burst-mode operation. when v fb drops below v fb-zdc , switching stops and the output voltage starts to drop, which causes the feedback voltage to rise. once v fb rises above v fb-zdc , switching resumes. burst mode alternately enables and disables switching, thereby reducing switching loss in standby mode, as shown in figure 26. figure 25. pwm frequency figure 26. burst-mode operation frequency hopping emi reduction is accomplished by frequency hopping, which spreads the energy over a wider frequency range than the bandwidth measured by the emi test equipment. an internal frequency-hopping circuit changes the switching frequency between 61.0 khz and 69.0 khz with a period of 4.4 ms, as shown in figure 27. this covers the whole frequency range and shrinks the period with operation frequency proportionally. figure 27. frequency hopping
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 12 fan6862w ? highly integrated green-mode pwm controller protections self-protective functions include v dd over-voltage protection (ovp), open-loop / overload protection (olp), over-current protec tion (ocp), short-circuit protection (scp) and over-temperature protection (otp). olp, ocp and scp are auto-restart mode protections; ovp and otp ar e latch-mode protections. auto-restart mode protection once a fault condition is detected, switching is terminated and the mosfet remains off. this causes v dd to fall because no more power is delivered from auxiliary winding. when v dd falls to v dd-off (7 v), the protection is reset and the operating current reduces to startup current, which causes v dd to rise. fan6862w resumes normal operation when v dd reaches v dd-on (16 v). in this manner, the auto-restart can alternately enable and disable the switch ing of the mosfet until the fault condition is eliminated ( see figure 28 ). figure 28. auto restart operation latch-mode protection once this protection is trigge red, switching is terminated and the mosfet remains off. the latch is reset only when v dd is discharged below 4 v by unplugging the ac power line. over-current protection (ocp) fan6862w over-current protection is a pulse-by-pulse bias current limit threshold (v limit ) that turns off the mosfet once the sensing vo ltage of mosfet drain current reaches the threshold. the v limit compensates the power-limit variation over the universal input range and adaptively keeps the power limit constant. open-loop / overload protection (olp) when the upper branch of the voltage divider for the shunt regulator (ka431 shown in figure 29) is broken, no current flows through the photo-coupler transistor, which pulls up the feedba ck voltage to 5.4 v. when feedback voltage is above 4.6 v for longer than 60 ms, olp is triggered. this protection is also triggered when the smps output drops below the nominal value for longer than 60 ms due to the overload condition. if the secondary output-short situation occurs when the feedback voltage is above 4.6 v, protection time is 7 ms for shorter debounce time. figure 29. olp operation v dd over-voltage protection (ovp) v dd over-voltage protection prevents ic damage caused by over voltage on the v dd pin. the ovp is triggered when v dd reaches 22.2 v. a debounce time (typically 50 s) prevents false triggering by switching noise. over-temperature protection (otp) the otp circuit is composed of current source and voltage comparators. typica lly, an ntc thermistor is connected between the rt and gnd pins. if the voltage of this pin drops below a th reshold of 1.0 v, pwm output is disabled after t dotp debounce time. if this pin voltage drops below 0.7 v, it trigge rs the latch-off protection immediately after t dotp2 debounce time.
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 13 typical application circuit (netbook adapter by flyback) application fairchild devices input voltage range output netbook adapter fan6862w 90~265 v ac 19 v / 2.1a (40 w) features ? high efficiency (>85.3% at full-load condition) meeting eps regula tion with enough margin ? low standby (pin<0.1 w at no-load condition) ? soft-start time: 5 ms figure 30. measured efficiency and power saving figure 31. schematic of typical application circuit 230 v ac 50hz (89.92% avg.) 115 v ac 60hz (88.75% avg.) 85.29% (energy star v2.0)
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 14 fan6862w ? highly integrated green-mode pwm controller transformer specification ? core: rm 8 ? bobbin: rm 8 figure 32. transformer no terminal wire ts insulation s f ts n1 11 10 0.25 ? 1 9 3 n2 3 2 0.25 ? 1 33 1 11 copper shield 1.2 3 n3 fly- fly+ 0.5 ? 2 12 1 11 copper shield 1.2 3 n4 2 1 0.25 ? 1 33 4 core rounding tape 3 pin specification remark primary-side inductance 3 1 920 h 5% 100 khz, 1 v primary-side effective leakage 3 1 15 h maximum short one of the secondary windings
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 15 fan6862w ? highly integrated green-mode pwm controller physical dimensions figure 33. 6-lead, sot23, jedec mo-178 variation ab, 1.6 mm wide package drawings are provided as a service to customers consi dering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packa ging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ . notes: a. this package conforms to jedec mo-178, variation ab. b. all dimensions are in millimeters. c. does not include mold flash, protrusions or gate burrs. d. does not include interlead flash or protrusions. e. dimensions and tolerancing as per asme y14.5m-1994 f. drawing file name: ma06erev2 1.30 0.90 0.15 0.05 8x 0x seating plane 0.60 ref 0.60 0.30 scale: 2:1 detail a see detail a gage plane 0.25 1.45 max 0.08 0.22 land pattern recommendation symm c l c c 0.10 0.15 ca-b 0.15 c 2x 2x 3 tips 6x 2.9 1.6 2x 1.9 a 2.8 1.4 0.15 c d 0.95 b 2x 0.3-0.5 0.20 ca-bd d pin 1 index area (0.95) (0.95) (1.00min) (1.90) (2.60) (0.70min) r0.10min r0.10min c d d c
? 2012 fairchild semiconductor corporation www.fairchildsemi.com fan6862w ? rev. 1.0.0 16 fan6862w ? highly integrated green-mode pwm controller

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