UNISONIC TECHNOLOGIES CO., LTD

3512

CMOS IC

www.unisonic.com.tw

1 of 9

Copyright © 2005 Unisonic Technologies Co., Ltd

QW-R502-073,A

PC POWER SUPPLY

SUPERVISORS

DESCRIPTION

The UTC 3512 is specially designed for switching power supply

system. It provides over-voltage protection, over-current protection,

under-voltage protection, on/off control and power good signal

generating.

OVP/UVP (Over/Under-Voltage Protection) monitors 3.3V, 5V

and double 12V to protect our power supply and PC, FPO goes to

high when one of these supply voltages exceeds their normal

operation voltage range.

OCP (Over Current Protection) monitors IS33, IS5, IS12 input

current. The voltage difference across external current shunt is

used for OCP functions. An external resistor which is connected

between the RI pin and the GND pin can be used to adjust

protection threshold. To achieve better immunity for lighting surge

glitch and to prevent accidental power shut down during dynamic

loading condition, the de-bounce time for UVP/OCP is 73us

respectively. The deglitch time for OVP is 73uS for better noise

immunity.

The power supply is turned on after 38mS de-bounce time when

PSON signal is set from high to low. To turn off power supply,

PSON signal is set from low to high and the de-bounce time is

115mS. When PGI input voltage level is lower than the internal

1.15V reference voltage, after 73uS de-bounce time, the PGO

signal is pulled low.

FEATURES

* Over/Under-voltage protection for 3.3V, 5V, and two 12V

* Over-current protection for 3.3V, 5V, and two 12V

* PGO and FPO pins with open drain output stage

* 300mS power good delay from PGI to PGO

* 75mS delay for 3.3V, 5V and 12V power turn on

* 2.8mS delay for PSON control to FPO turn off

* 38mS / 115mS PSON on/off de-bounce time

* 73uS width noise deglitches

* 73uS de-bounce time for UVP and OCP

* Wide supply voltage range

DIP-14

SOP-14

*Pb-free plating product number: 3512L

ORDERING INFORMATION

Order Number

Normal

Lead Free Plating

Package

Packing

3512-D14-T

3512L-D14-T

DIP-14

Tube

3512-S14-R

3512L-S14-R

SOP-14

Tape Reel

3512-S14-T

3512L-S14-T

SOP-14

Tube