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| PS236 version : a.001 issue date : 2005/11/16 file name : sp-PS236-a.001.doc total pages : 13 3-channel secondary monitoring ic with an additional ocp channel ?W@^?I? 9?7?1 silicon touch technology inc . 9-7f-1, prosperity road i, science based industrial park, hsin-chu, taiwan 300, r.o.c. tel 886-3-5645656 fax 886-3-5645626
3-channel secondary monitoring ic version a.001 - 1 - ps23 6 PS236 3-channel secondary monitoring ic with an additional ocp channel general description PS236 is specially designed for switching power supply system. four important functions of PS236 are the following: over-vol tage protection, over-current protection, under-voltage protection and power good signal generating. ovp/uvp (over-voltage/under-voltage protec tion) monitors 3.3v, 5v and 13v to protect our power supply. fpo/ goes to high when one of these supply voltages exceeds their normal oper ation voltage range. ocp (over current protection) monitors is33, is5, is13 input current sense. composed of ?i ref ? and ?protection current range resist or?, an adjustable over-current condition helps users design ocp easily. an additional ocp channel helps users m onitor additional vsx rail output current. power good signal generating can notify pers onal computer when power supply is ready or power supply is going to shutdown, therefore it can provide a reliable power supply environment. features ? over/under-voltage protection and lock out ? over-current protection and lock out ? fault protection output with open drain output stage ? open drain power good output si gnal for power good input ? built-in 300ms power good delay ? ac on 3ms delay for uv/oc protection ? 17us de-bounce for noise immunity ? wide power supply range (4.2v~18v) ? special care for ac power off 3-channel secondary monitoring ic version a.001 - 2 - ps23 6 block diagram h : 2.5ms l : 4.5us delay v cc / vsx vs13 v s5 v s33 is x is13 is5 is33 3.3 ov 3.3 uv 5 ov 5 uv 13 ov 13 uv 17us de-bounce band-gap reference power on reset clock generator 73us de-bounce h : 300ms l : 4.5us delay constant current source i ref s q r fpo/ pgi pgo ri gnd por v ref clk 1m 1m 1 0 s q r 1.25v h : 3ms l : 4.5us delay 159k 6.5k 14.5k v re f v re f vcci vcci 64.5k 6k 19.5k v re f v re f vcci vcci 51k 10k 29k v re f v re f vcci vcci i ref x 8 vcc oc vcci i ref x 8 13 oc vcci i ref x 8 5 oc vcci i ref x 8 3.3 oc vcci internal power vcci = 4v 1.13v vcci 0.63v vcci 1.25v vcci vcci step down to near 2.5v step down to near 2.5v step down to near 2.5v step down to near 2.5v por 3-channel secondary monitoring ic version a.001 - 3 - ps23 6 timing chart t d1 t d2 fpo/ pgi vcc isx vs13 is13 vs5 is5 vsx vs33 is33 pgo uvp/ovp/ocp protect ac turn on ac turn off v pgi t d2 t d1 1.25v 0.63v 1.13v ovp/uvp/ocp uvp/ocp protect 3-channel secondary monitoring ic version a.001 - 4 - ps23 6 pin descriptions pin no pin name descri p tions 1 pgi power good input signal pin 2 gnd ground 3 fpo/ inverted fault protection output ,open drain output stage 4 n/c n/c 5 is13 13v over current protection input pin 6 ri current sense setting 7 isx vsx over current protection input pin 8 is5 5.0v over current protection input pin 9 is33 3.3v over current protection input pin 10 vs13 13v over/under voltage protection input pin 11 vs33 3.3v over/under voltage protection input pin 12 vs5 5.0v over/under voltage protection input pin 13 vcc / vsx power supply 14 pgo power good output signal pin , open drain output stage absolute maximum ratings paramete r ratin g unit storage temperature (t stg ) -40 to +125 c operating temperature (t opr ) -30 to +90 c supply voltage (v cc ) vcc/vsx -0.5 to +18.0 v isx, vs13, is13 -0.5 to +18.0 v vs5, is5 -0.5 to +9.0 v vs33, is33 -0.5 to +7.0 v input voltage range (v i ) pgi -0.5 to +16.0 v fpo/ -0.5 to +16.0 v output voltage range (v o ) pgo -0.5 to vcc+0.5 v output current for ri (i ri ) ri 12.5 to 62.5 ua 3-channel secondary monitoring ic version a.001 - 5 - ps23 6 electrical characteristics , vcc=12v, t a = 25 ? c range. (unless otherwise specified) power supply section parameter conditions min typ max unit su pp l y volta g e 4.2 5.0 18.0 v su pp l y current v pson/ = 5v 2 3 m a power on reset threshold volta g e ( v por ) 3.2 3.4 3.6 v power on reset h y steresis ( v hyst ) -0.15 -0.3 -0.45 v over-voltage section parameter conditions min typ max unit vs33 3.8 3.9 4.2 v vs5 5.5 5.8 6.0 v over-voltage threshold vs13 15.0 15.5 16.0 v under-voltage section parameter conditions min typ max unit vs33 2.7 2.9 3.0 v vs5 4.1 4.4 4.6 v under-voltage threshold vs13 10.1 10.8 11.0 v over-current section parameter conditions min typ max unit vsx, isx -5 -2 1 mv vs33, is33 -5 -2 3 mv vs5, is5 -5 -2 3 mv offset voltage (ocp comparator) vs13, is13 -5 -2 1 mv constant current generator volta g e ( v ri ) 1.20 1.25 1.30 v 3-channel secondary monitoring ic version a.001 - 6 - ps23 6 electrical characteristics (continued) pgi, analog input parameter conditions min typ max unit threshold volta g e for start t d1 1.16 1.25 1.33 v threshold volta g e for start t d2 0.60 0.63 0.75 v threshold volta g e for mask oc,uv 1.05 1.13 1.21 v h y steresis ( v hyst ) * -20 -50 -80 mv * all of the comparator for pgi input in block diagram. pgo, open drain digital output parameter conditions min typ max unit leaka g e current ( i lkg ) v pgo =5v 5 u a low level out p ut volta g e ( v ol ) i sink =5m a 0.4 v fpo/, open drain digital output parameter conditions min typ max unit leaka g e current ( i lkg ) v fpo/ =5v 5 u a low level out p ut volta g e ( v ol ) i sink =5m a 0.3 v switching characteristics , vcc=12v, t a = 25 ? c. parameter conditions min typ max unit pgi to pgo dela y time ( t d1 ) 200 300 400 ms short circuit dela y t ime ( t d2 ) 23 4 ms over current dela y t ime ( t d3 ) 1.6 2.5 3.2 ms fpo/ noise de- g litch t ime ( t b1 ) 9 17 26 us pgo noise de- g litch t ime ( t b2 ) 47 73 100 us 3-channel secondary monitoring ic version a.001 - 7 - ps23 6 application typical 4 rails sps d v r oc12(2) r oc5 r oc33 r oc12(1) r i r pgi c pgi 1k +5v sb pgo +5v sb = or s.p.s. secondary side r s5 +5v output r s12(2) +12v output +12v coil r s12(1) +13v output +13v coil r s33 +3.3v output +3.3v coil r pgo 4.7k d i r os 5.6k 14 13 12 11 10 8 1 2 3 4 5 6 7 pgi n/c ri isx is13 fpo/ gnd pgo vs33 is33 is5 vs13 vs5 vsx PS236 9 c by 0.1 uf 0.1 uf 0.1 uf 0.1 uf 3-channel secondary monitoring ic version a.001 - 8 - ps23 6 application (continued) typical 3 rails sps r oc5 r oc33 r oc12 r i r pgi c pgi 1k +5v sb pgo +5v sb = or s.p.s. secondary side r s5 +5v output r s12 +13v output +13v coil r s33 +3.3v output +3.3v coil r pgo 4.7k 14 13 12 11 10 8 1 2 3 4 5 6 7 pgi n/c ri isx is13 fpo/ gnd pgo vs33 is33 is5 vs13 vs5 vsx PS236 9 c by 0.1 uf 0.1 uf 0.1 uf 3-channel secondary monitoring ic version a.001 - 9 - ps23 6 notes: 1. zener diode or resist or or both of t hem can be used in component x. 2. the bypass capacitor c by suggests to be 0.1uf~ 10uf and layout nearby pin vcc. 3. the recommend sense values of r s12(1) , r s12(2) , r s5 and r s33 are 0.002 . 4. over-current protection design example: (1) a i ref 20 = , () = = = k i v r ri ri i 5 . 62 20 25 . 1 (2) r s5 =0.002 , ref oc v v i r i v = = + 8 002 . 0 5 5 5 (3) if +5v ocp trip point is 20a, () = = 250 20 8 20 002 . 0 5 oc r 5. gnd path: (1) the gnd path width is wider as far as it could. (2) the better grounding ability has better performance at surge test. 6. PS236 uses single 13v ocp protection function: as ?typical 3 rails sps? application ci rcuit, the pin7(isx) must be connected a resistor(resistance>1k ) to vcc/vsx or floating. 3-channel secondary monitoring ic version a.001 - 10 - ps23 6 package specification d e 1 e b 1 a 1 e a s a 2 ? 0.0 0.5 1.0 inch 0 10 25 mm 15 5 20 ( 14-pin dip ) l seating plane b e b dimension in mm symbol dimension in inch a 5.330 (max) 0.210 (max) a 1 0.380 (min) 0.015 (min) a 2 3.300 0.130 0.130 0.005 b 1.520 (typ) 0.060 (typ) b 1 0.460 (typ) 0.018 (typ) d 19.400 0.200 0.764 0.008 e 7.620 (typ) 0.300 (typ) e 1 6.350 0.130 0.250 0.005 e 2.540 (typ) 0.100 (typ) e b 9.000 0.500 0.355 0.020 l 9.020 0.500 0.130 0.020 s 1.800 (typ) 0.074 (typ) ? 0 ~ 15 0 ~ 15 note 3-channel secondary monitoring ic version a.001 - 11 - ps23 6 package specification (continued) dimension in mm symbol dimension in inch min. max. min. max. d e h a 1 a c l 0.0 0.2 0.4 inch 0 10 mm 5 ( 14-pin sop ) seating plane a 1.35 1.75 0.0532 0.0688 a 1 0.1 0.25 0.0040 0.0098 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.0075 0.0098 e 1.27bsc 0.050bsc d 8.55 8.75 0.3367 0.3444 h 5.80 6.20 0.2284 0.2440 e 3.80 4.00 0.1497 0.1574 l 0.40 1.27 0.016 0.050 h 0.25 0.50 0.0099 0.0196 0 8 0 8 note b e h x 45 3-channel secondary monitoring ic version a.001 - 12 - ps23 6 the products listed herein are designed for or dinary electronic applications, such as electrical appliances, audio-visual equi pment, communications devices and so on. hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machi nery, nuclear power control systems, disaster/crime-prevention equipment and the like. misusing those products may directly or indirectly endanger human lif e, or cause injury and property loss. silicon touch technology, inc. will not take any responsibilities regarding the misusage of the products m entioned above. anyone w ho purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. silicon touch technology, inc. and its distributors and all their office rs and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such in tention and manipulation. silicon touch technology, inc. reserve the ri ght to make changes to their products or to discontinue any product or service without notice, and advise cu stomers to obtain the latest version of relevant informati on to verify, before placing orders, that information being relied on is current and complete. |
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