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S3525 Dataheets PDF



Part Number S3525
Manufacturers Unisonic Technologies
Logo Unisonic Technologies
Description PC POWER SUPPLY SUPERVISOR
Datasheet S3525 DatasheetS3525 Datasheet (PDF)

UNISONIC TECHNOLOGIES CO., LTD S3525 PC POWER SUPPLY SUPERVISOR „ DESCRIPTION The UTC S3525 is specially designed for switching power supply system. it provides protection circuits, power good output (PGO) indicator, fault protection output (FPOB) and a PSONB control. The protection circuits include over voltage protection (OVP), under voltage protection (UVP) and over current protection (OCP) monitoring for system voltages and currents. When 3.3V, 5V or 12V voltage is decreasing to 2.68V, 4.3V.

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UNISONIC TECHNOLOGIES CO., LTD S3525 PC POWER SUPPLY SUPERVISOR „ DESCRIPTION The UTC S3525 is specially designed for switching power supply system. it provides protection circuits, power good output (PGO) indicator, fault protection output (FPOB) and a PSONB control. The protection circuits include over voltage protection (OVP), under voltage protection (UVP) and over current protection (OCP) monitoring for system voltages and currents. When 3.3V, 5V or 12V voltage is decreasing to 2.68V, 4.3V and 9.9V respectively, the under voltage protection (UVP) function will be enabled. FPOB will be set to high to turn off the PWM controller IC. Toggling the PSONB from low to high will reset the fault protection latch. The voltage difference across external current shunt is used for OCP functions. An external resistor can be used to adjust protection threshold. The power supply is turned on after 38mS delay time when PSONB signal is set from high to low. To turn off power supply, PSONB signal is set from low to high with the delay time 38mS. The PGI circuitry provides a power-down warning signal for PGO. When PGI input is lower than the internal 1.20V reference voltage, PGO signal is pulled low. „ FEATURES * OVP/UVP monitors 3.3V, 5V, 12V input voltage level. * OCP monitors IS33, IS5, IS12 input current sense. * Fault protection output (FPOB) with Open Drain Output stage. * Power good output (PGO) with Open Drain Output stage. * 38ms de-bounce time for PSONB input signal. * 300ms time delay from PGI to PGO. * 2.4ms time delay for PSONB to turn off FPOB. „ ORDERING INFORMATION Ordering Number Lead Free Plating Halogen Free S3525L-D14-T S3525G-D14-T S3525L-S14-R S3525G-S14-R S3525L-S14-T S3525G-S14-T Package DIP-14 SOP-14 SOP-14 CMOS IC Packing Tube Tape Reel Tube www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd 1 of 9 QW-R502-105.B S3525 „ PIN ASSIGNMENT CMOS IC „ FUNCTION DESCRIPTION PGI PSONB UV&OC Protection OV Protection PGI<1.2V L No No PGI<1.2V L No Yes PGI<1.2V L Yes No PGI<1.2V L Yes Yes PGI>1.2V L No No PGI>1.2V L No Yes PGI>1.2V L Yes No PGI>1.2V L Yes Yes XHXX Note: FPOB=L means: fault is not latched. FPOB=H means: fault is latched PGO=L means: fault. PGO=H means: No fault X=do not care FPOB L H L H L H H H H PGO L L L L H L L L L „ PIN DESCRIPTIONS PIN NO. 1 2 3 PIN NAME PGI GND FPOB 4 PSONB 5 IS12AB 6 RI 7 V12B 8 IS5 9 IS33 10 V12A 11 V33 12 V5 13 VDD 14 PGO TYPE Input Supply Output Input Input Input Input Input Input Input Input Input Supply Output DESCRIPTION Power Good Input. For ATX SMPS, it detects AC line voltage through the main transformer. Ground Fault Protection Output. Output signal to control the primary PWM IC through an opto-coupler. When FPOB is low, the PWM IC is enabled. Remote On/Off logic input from CPU or main-board. The power supply will be turned on/off after 38mS delay. 12V AB over current protection. Reference setting. One external resistor Ri connected between RI and GND pin will determine a reference current, IREF = 1.20/Ri, for OCP programming. 12V over/under voltage protection. 5V over current protection. 3.3V over current protection 12V over/under voltage protection. 3.3V over/under voltage protection 5V over/under voltage protection. Power supply. Power good logic output, 0 or 1(open-drain). Power good=1 means that the power supply is good for operation. The power good delay is 300mS. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R502-105.B S3525 „ BLOCK DIAGRAM PGI Bandgap Reference VREF=1.2V IS33 VS33 IS12AB VS12A VS12B IS5 VS5 +- UN V12A + IREF*8 + -OV +-UN V12A + - IREF*8 + -OV +-UN V12A + - + -OV +-UN V12A + IREF*8 + -OV +-UN CMOS IC 73 μs debounce 225ms clr delay V cc PGO 73 μs debounce RQ SQ FPOB Power On Reset Internal PWR Power VCCI=3.6V 2.4ms delay 38 ms debounce PSONB 75ms/ 300ms delay PWR OSC CLK V12A VREF=1.2V + - RI UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 9 QW-R502-105.B S3525 CMOS IC „ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage, VDD, V12A Input Voltage V5,V33, PSONB, IS5, IS33 IS12AB, V12B PGI VIN -0.3 ~ 16 -0.3 ~ 7 -0.3 ~ 16 -0.3 ~ VDD+0.3 V V V V Output Voltage FPOB PGO VOUT -0.3 ~ 7 -0.3 ~ 7 V V Operating Temperature TOPR -40 ~ +125 °C Storage Temperature TSTG -55 ~ +150 °C Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. „ RECOMMENDED OPERATING CONDITIONS Supply Voltage VDD Supply Voltage VCC2 Input Voltage PARAMETER Output Voltage Output Sink Current RI Output Current Supply Voltage Rising Time (VDD) SYMBOL VDD V5,V33 ,PGI ,PSONB V12A, V12B FPOB PGO FPOB PGO VIN VOUT IO(SINK) IO(RI) tR MIN 4 9.5 10 1 TYP 12 12 „ ELECTRICAL CHARACTERISTICS (Ta=25°C and VDD=5V and V12A=12V) MAX 15 15 7 15 7 7 30 10 65 UNIT V V V V V.


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