TPS3513 Datasheet, PDF (2/15 Pages) Texas Instruments – PC POWER SUPPLY SUPERVISORS

TPS3513
PC POWER SUPPLY SUPERVISORS
SLVS313 – FEBRUARY 2001
description (continued)
UVLO thresholds are 4.45 V (on) and 3.65 V (off). Overcurrent protection (OCP) and overvoltage protection
(OVP) monitor 3.3 V, 5 V, and 12 V. 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 75 ms after PSON goes low, and a debounce of typically 38 ms. A built-in
2.3-ms delay with 38-ms debounce from PSON to FPO output is enabled at turnoff.
An external resistor is connected between the RI pin and the GND pin. This will introduce an accurate I_(ref) for
OCP function. The I_(ref) range is from 12.5 µA to 62.5 µA. The formula for choosing RI resistor is V_(RI)/I_(ref). Three
OCP comparators and the I_(ref) section are supplied by VS12. The current draw from the VS12 pin is less
than 1 mA.
The power good feature monitors PGI, 3.3 V and 5 V, and issues a power good signal when the output is ready.
The TPS3513 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
PGI
PSON
UV CONDITION
3.3 V / 5 V
OV CONDITIONS
< 0.9 V
L
No
No
< 0.9 V
L
No
No
< 0.9 V
L
No
Yes
< 0.9 V
L
No
Yes
< 0.9 V
L
Yes
No
< 0.9 V
L
Yes
No
< 0.9 V
L
Yes
Yes
< 0.9 V
L
Yes
Yes
1.0 V < PGI < 1.1 V
L
No
No
1.0 V < PGI < 1.1 V
L
No
No
1.0 V < PGI < 1.1 V
L
No
Yes
1.0 V < PGI < 1.1 V
L
No
Yes
1.0 V < PGI < 1.1 V
L
Yes
No
1.0 V < PGI < 1.1 V
L
Yes
No
1.0 V < PGI < 1.1 V
L
Yes
Yes
1.0 V < PGI < 1.1 V
L
Yes
Yes
>1.2 V
L
No
No
>1.2 V
L
No
No
>1.2 V
L
No
Yes
>1.2 V
L
No
Yes
>1.2 V
L
Yes
No
>1.2 V
L
Yes
No
>1.2 V
L
Yes
Yes
>1.2 V
L
Yes
Yes
x
H
x
x
x = don’t care
FPO = L means: fault is not latched
FPO = H means: fault is latched
PGO = L means: fault
PGO = H means: No fault
UV CONDITION 12 V
OC CONDITIONS
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
x
FPO
L
L
H
H
L
L
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
PGO
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
2
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