UNISONIC TECHNOLOGIES CO., LTD
3513
PC POWER SUPPLY
SUPERVISOR
DESCRIPTION
The UTC
3513
is designed to provide protection circuits,
power good output (PGO) indicator, fault protection output
(FPOB) and a PSONB control for PC switching power supply
systems.
The protection circuits include over voltage protection
(OVP), under voltage protection (UVP) and over current
protection(OCP) monitoring for 3.3V, 5V and two 12V.
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. FPO 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.
The device is available in two versions: UTC
3513E/3513F.
Specially, fan control function is available in OTP/FC pin of
UTC
3513F.
CMOS IC
* Pb-free plating product number: 3513EL/3513FL
FEATURES
* OVP/UVP monitors 3.3V, 5V, 12V input voltage level.
* OCP monitors I
S33
, I
S5
, I
S12
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.
www.unisonic.com.tw
Copyright © 2007 Unisonic Technologies Co., Ltd
1 of 12
QW-R502-129.A
3513
FUNCTION DESCRIPTION（1）
ORDERING
3513E
3513F
OTP low level
2.45V
2.45V
OTP high level
3.25V
3.25V
FC/PWM
X
○
T(PSONB ON)/
T(PSONB OFF)
38ms
38ms
CMOS IC
tg2
73µs
73µs
FUNCTION DESCRIPTION（2）
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
X
H
X
X
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
4
5
6
7
8
8
9
9
10
11
12
13
14
15
16
* 3513E only
** 3513F only
PIN NAME
PGI
GND
FPOB
PSONB
OTP/FC
RI
V
S12B
I
S12B
*
P
WM
**
I
S12A
*
I
S12AB
**
V
S12A
I
S33
V
S33
I
S5
V
S5
V
DD
PGO
TYPE
Input
Supply
Output
Input
Input
Input
Input
Input
Output
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.
Over temperature protection/Fan speed control
Reference setting. One external resistor Ri connected between RI
and GND pin will determine a reference current, I
REF
= 1.20/Ri, for
OCP programming.
12V over/under voltage protection.
12V over current protection.
Pulse width modulation.
12V over current protection.
12V over current protection.
12V over/under voltage protection.
3.3V over current protection
3.3V over/under voltage protection
5V over current 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
4 of 12
QW-R502-129.A
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