UNISONIC TECHNOLOGIES CO., LTD
3512
PC POWER SUPPLY
SUPERVISORS
CMOS IC
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.
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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
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
3512-D14-T
3512L-D14-T
3512-S14-R
3512L-S14-R
3512-S14-T
3512L-S14-T
Package
DIP-14
SOP-14
SOP-14
DIP-14
SOP-14
*Pb-free plating product number: 3512L
Packing
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Tape Reel
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Copyright © 2005 Unisonic Technologies Co., Ltd
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