oct , 2009 v1.2 1 / 9 power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm features features features features ? pc half-bridge (or 494) power supply supervisor + pwm ? high integration & few external components ? over-voltage protection for 3.3v, 5v ,12v and pt ? under-voltage protection for 3.3v, 5v and 12v ? over-voltage protection for extra voltage input ? power-down warning circuitry ? power good circuitry ? delay time for pson ? 280ms pg time delay ? remote on/off function ? 280 ms time delay for uvp ? on-chip error amplifier ? on-chip oscillator ,frequency is adjustable by external resistor ? pwm dead - time control ? soft-start and maximum 90% duty cycle ? compatible with wt7520 ? pb-free dip-16l package applications applications applications applications ? atx pc power ? tft- lcd- tv ? nlx /sfx power general general general general description description description description PHY4943D controller is designed for switching mode power supply for desktop pcs. it provides all the functions necessary to monitor and control the output of the power supply. remote on/off control, power good circuitry, some protection features against over-voltage and over-power are implemented. it directly senses all the output rails for ovp without the need of external dividers. an innovated ac-signal sampling circuitry provides a sufficient power-down warning signal for pg. a built-in timer generates accuracy timing for control circuit including the ps-off delay. the pwm dead- time control prevents the power transformer from the saturation and ensures the fastest response for the short-circuit protection which greatly reduce the stress for power transistors. utilizing minimum number of external components, the includes all of the functions for push-pull and/or half-bridge topology, decreasing the production cost and pcb space, and increasing the mtbf for power supply PHY4943D PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 2 / 9 dip-16l dip-16l dip-16l dip-16l package package package package top-view top-view top-view top-view pin pin pin pin descriptions descriptions descriptions descriptions pin pin pin pin no. no. no. no. pin pin pin pin name name name name type type type type function function function function 1 v33 i ovp/uvp input for 3.3v. 2 v5 i ovp/uvp input for 5v. 3 v12 i ovp/uvp input for 12v. 4 pt i extra ovp protection input. 5 gnd p ground. 6 rt o oscillation frequency set by external resistor. 7 c1 o pwm open drain output 1. 8 c2 o pwm open drain output 2. 9 rem i remote on/off input. rem= low that means the main smps is turned-on. rem= high , the main smps is turned-off. 10 ss o soft start function set by external capacitor. 11 pg o power good signal. pg= high means power good .pg= low means power fail . 12 det i extra protection input. 13 vcc p supply voltage. 14 opout o op compensation output. 15 opnegin i op compensation negative input. 16 vadj i op compensation positive input , feedback voltage sense input. PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 3 / 9 absolute absolute absolute absolute maximum maximum maximum maximum ratings ratings ratings ratings @v @v @v @v cc cc cc cc =5.5v =5.5v =5.5v =5.5v temperature temperature temperature temperature characteristics,vcc=5v characteristics,vcc=5v characteristics,vcc=5v characteristics,vcc=5v electrical electrical electrical electrical characteristics.ta=25 characteristics.ta=25 characteristics.ta=25 characteristics.ta=25 ,vcc=5v ,vcc=5v ,vcc=5v ,vcc=5v supply voltage v cc 5.5 v drain output voltage vcc1,vcc2 5.5 v drain output current icc1,icc2 200 ma power dissipation pd 200 mw operating temperature topr -10 to 70 operating junction temperature tj -20 to 150 storage temperature tstg -40 to 150 characteristics characteristics characteristics characteristics symbol symbol symbol symbol min min min min typ typ typ typ max max max max unit unit unit unit coefficient of vref(-10 ~+85 ) 0.01 %/ characteristics characteristics characteristics characteristics symbol symbol symbol symbol test test test test condition condition condition condition min min min min typ typ typ typ max max max max unit unit unit unit dead dead dead dead time time time time control control control control section section section section input threshold voltage vthdt zero duty cycle 3.0 3.3 v max.duty cycle 0.1 error error error error amp amp amp amp section section section section close loop voltage gain 0.5v~3.5v 65 db cross over point 0db 320 khz opneg bias voltage opneg open 2.38 2.45 2.52 v output output output output section section section section output saturation voltage vdssat id=200ma 1.1 1.3 v drain off-state current idoff vcc=vd=vs=0v 2 10 ua rising time tr 100 200 ns falling time tf 50 200 ns PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 4 / 9 protection protection protection protection section section section section over voltage protection (ovp) v33 3.8 4.1 4.3 v v5 5.8 6.2 6.6 v v12 4.41 4.64 4.90 v pt 1.2 1.25 1.3 v under voltage protection (uvp) v33 1.78 1.98 2.18 v v5 2.70 3.00 3.30 v v12 2.11 2.37 2.63 v uvp disable voltage pt 0.55 0.62 0.68 v uvp delay time td.uvp 100 280 500 ms remote remote remote remote on/off on/off on/off on/off section section section section rem high input voltage vremh 2.0 v rem low input voltage vreml 0.8 v rem pull high voltage vremo 2.0 5.25 v rem delay time trem 3.0 36 42 ms rem off delay time toff 3.5 4.5 5.5 ms power power power power good good good good section section section section detecting input voltage vdet 0.55 0.62 0.68 v pg output pull-up resistor rpup.pg 5 k pg output load resistor rpg 0.5 1 2 k pg delay time 150 280 350 ms output saturation voltage vsat.pg ipg=10ma 0.2 0.4 v total total total total device device device device standby supply current icc 10 20 ma oscillation oscillation oscillation oscillation section section section section oscillation frequency fosc ct=2200p 50 70 khz soft soft soft soft start start start start section section section section sink current of ss iss.sink 13 ua source current of ss iss.source 700 ua PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 5 / 9 block block block block diagram diagram diagram diagram PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 6 / 9 typical typical typical typical application application application application description description description description 1. 1. 1. 1. input input input input impedance impedance impedance impedance : : : : pin pin pin pin no. no. no. no. pin pin pin pin name name name name input input input input impedance impedance impedance impedance 1 v33 47 .2 k 2 v5 73 .3 k 3 v12 47 .4 k 4 pt 24 .0 k +4.6k 2. 2. 2. 2. osc osc osc osc function function function function : : : : the period of the saw tooth is t osc : a 44 . 3 3 1 120k 24v . 1 3 1 rt 24v . 1 i charge = ? ? ? ? ? ? ? = ? ? ? ? ? ? = s 6 . 16 i c 3v . 3 t charge osc = = 60khz t 1 f osc osc = = PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 7 / 9 3.remote 3.remote 3.remote 3.remote on/off: on/off: on/off: on/off: 4. 4. 4. 4. under under under under voltage voltage voltage voltage protection protection protection protection delay delay delay delay time: time: time: time: 5. 5. 5. 5. pulse pulse pulse pulse width width width width modulation modulation modulation modulation pwm pwm pwm pwm block: block: block: block: the output pulse width modulation is generated by comparision of the saw C tooth waveform from the capacitor c t to the feedback of the voltage. therefore, an increase in feedback control signal amplitude cause a linear decrease of the output pulse width. also, the ss(dtc and soft-start) limits the output pulse width. the timing diagram is shown as below: PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 8 / 9 6.protection 6.protection 6.protection 6.protection control control control control of of of of the the the the soft-start: soft-start: soft-start: soft-start: this signal is prepared for extra ovp/opp (v pt > 1.25v) or another disable under voltage protection function (v pt < 0.62v) . 7. 7. 7. 7. reference reference reference reference application application application application cir cir cir cir c c c c uit: uit: uit: uit: note: in some application power system, adding an external resistor (r9) could reduce the peak value spike from the environments to pin 9 (rem) and avoid pin 9 (rem ) damaged by the external noise. PHY4943D PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
power power power power supply supply supply supply supervisor supervisor supervisor supervisor + + + + pwm pwm pwm pwm oct , 2009 v1.2 9 / 9 package package package package information information information information (dip-16l) (dip-16l) (dip-16l) (dip-16l) PHY4943D www.datasheet.co.kr datasheet pdf - http://www..net/
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