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3515A Datasheet Preview

3515A Datasheet

PC POWER SUPPLY SUPERVISOR

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UNISONIC TECHNOLOGIES CO., LTD
3515A
PC POWER SUPPLY
SUPERVISOR
„ DESCRIPTION
The UTC 3515A 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
Halogen Free
3515AL-D14-T
3515AG-D14-T
3515AL-S14-R
3515AG-S14-R
3515AL-S14-T
3515AG-S14-T
Package
DIP-14
SOP-14
SOP-14
CMOS IC
Packing
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
1 of 9
QW-R502-105,B




UTC

3515A Datasheet Preview

3515A Datasheet

PC POWER SUPPLY SUPERVISOR

No Preview Available !

3515A
„ 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


Part Number 3515A
Description PC POWER SUPPLY SUPERVISOR
Maker UTC
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3515A Datasheet PDF





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