TSM115 datasheet(15/17 Pages) STMICROELECTRONICS

15 / 17 page

Electrical Characteristics

TSM115

15/17

TSM115: Housekeeping IC

TSM115 is a one chip solution for all PC SMPS: it

integrates on one chip the Housekeeping Circuitry

(Over and under voltage and over current

protections, with adequate sequencing).

Multiple Power Line Protection

The TSM115 Housekeeping Circuit is dedicated

to 3.3V, 5V and ±12V power lines protection. It

integrates a multiple Over and under Voltage

Protection Circuit and a multiple over current

Protection Circuit as well as all the necessary

logic and transient timing management circuits for

optimal and secure communication with the

motherboard, during start up, switch off and

stabilized conditions.

Over Voltage Protection

The Over Voltage Protection Circuit is made of

comparators with internal voltage thresholds

which do not require any external components for

proper

operation.

The

outputs

these

comparators are ORed.

Under Voltage Protection

The Under Voltage Protection Circuit is made of

comparators with internal voltage thresholds

which do not require any external components for

proper

operation.

The

outputs

these

comparators are ORed, and blanked by an

internal delay circuitry (Power Up Blanking - Tuv)

which can be adjusted with an external capacitor

(Cuv). This allows that during power up, the under

voltage protection circuit is inhibited.

Over Current Protection

The Over current Protection Circuit is made of

comparators with external thresholds which can

be adjusted by changing a resistor. The outputs of

these comparators are ORed.

FAULT

The Over Voltage and Under Voltage Circuits

outputs are ORed before activating a latch. When

activated, this latch commands the full switch OFF

of the main power lines (3.3V, 5V, 12V) by an

external link between the housekeeping and the

primary PWM circuits via the main optocoupler or

any other device.

Power Good

The Under Voltage Circuits are Ored to switch the

Power Good output active (PG) to warn the

motherboard that the voltage of at least one of the

three power lines is out of range. The PG

activation bears an internal Tpg delay circuitry

which can be adjusted with an external capacitor

(Cpg).

Remote Control

The remote control information from the mother

board, enters via the Remote pin (REM) to

activate an internal latch. When the Remote pin is

active,

the

external

Fault

link

between

Housekeeping circuit and the PWM generator is

active (high = PWM OFF) and the PG pin is active

(high). Note that to reset effectively the latch, a

minimum width Remote pulse should be applied

thanks to an internal delay circuitry (Trem) which

can be adjusted with an external capacitor

(Crem).

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