TPS3514 Datasheet, PDF (1/16 Pages) Texas Instruments – PC POWER-SUPPLY SUPERVISORS

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PC POWER-SUPPLY SUPERVISORS
TPS3514
SLVS422A – JULY 2003
FEATURES
D OVER-VOLTAGE PROTECTION AND LOCKOUT: 12V,
5V, and 3.3V Supplies
D OVER-CURRENT PROTECTION AND LOCKOUT:
12V, 5V, and 3.3V Supplies
D UNDER-VOLTAGE PROTECTION AND
LOCKOUT: 12V Supplies
D UNDER-VOLTAGE DETECT: 5V and 3.3V Supplies
D FAULT-PROTECTION OUTPUT WITH
OPEN–DRAIN OUTPUT STAGE
D OPEN-DRAIN, POWER-GOOD OUTPUT SIGNAL:
Monitors Power–Good Signal Input 3.3V and 5V
Supplies
D 300ms POWER-GOOD DELAY
D 75ms DELAY: 5V, 3.3V Power-Supply Short-Circuit
Turn-On Protection
D 2.3ms PSON CONTROL TO FPO TURN–OFF DELAY
D 38ms PSON CONTROL DEBOUNCE
D WIDE SUPPLY VOLTAGE RANGE: 4.5V to 15V
DESCRIPTION
The TPS3514 is a PC switching power-supply system monitor
with minimum external components. It provides under-voltage
lockout (UVLO), over-voltage (OV), under-voltage (UV),
over-current (OC), protection circuits, power-good indicator, and
on/off control.
UVLO thresholds are 4.45V (on) and 3.65V (off). Over-current
protection (OCP) and over-voltage protection (OVP) monitor 3.3V,
5V, and 12V supplies. When an OC or OV condition is detected,
the power–good output (PGO) is asserted LOW and the fault
protection output (FPO) is latched HIGH. PSON from
LOW-to-HIGH resets the latch. The OCP function will be enabled
75ms after PSON goes LOW with PGI HIGH and a debounce of
typically 38ms. A built-in 2.3ms delay with 38ms debounce from
PSON to FPO output is enabled at turn–off.
An external resistor is connected between the RI pin and the GND
pin. This will program a precise I_(REF) for OCP function. The
programmable I_(REF) range is from 12.5µA to 62.5µA. Three OCP
comparators and the I_(REF) section are supplied by VS12. The
current draw from the VS12 pin is less than 1mA.
The power–good feature monitors PGI, the 3.3V and 5V supplies,
and issues a power–good signal when the output is ready.
The TPS3514 is characterized for operation from –40°C to 85°C.
The TPS3514 is available in DIP-14 and SO-14 packages.
12V
5V
3.3V
5V VSB
PG
From Transformer
System Side
0.01Ω
R1Ω
R2Ω
560Ω
56kΩ
470kΩ _TPS3514
PGI
PGO
GND
FPO
VDD
VS5
PSON VS33
IS12
VS12
RI
IS33
NC
IS5
IO
0.01Ω
0.01Ω
1kΩ
820Ω
1.5kΩ
12V
5V
3.3V
5V VSB
Power Supply
Output Side
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PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
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