3-CHANNEL SECONDARY SUPERVISOR

DESCRIPTION

UTC S3526 is used for switching power supply system. UTC

S3526 provides protection functions, over-voltage protection,

over-current protection, under-voltage protection and power good

signal generating.

OVP/UVP (Over-Voltage/Under-Voltage Protection) monitors

triple 12V to protect our power supply and PC, FPO goes to high

when one of these supply voltages exceeds their normal operation

voltage range.

UTC S3526 OCP (Over Current Protection) monitors IS12A,

IS12B and IS12C input current sense by using smart comparator

circuit to make the point setting through sense resistor is more

exact and easy.

An additional latch protection input pin provides the flexibility for

design protection circuit.

UTC S3526 provides the fault protection latch (FPOB), the

power good output (PGO), the PSONB control and the power good

input control pin (PGI).

FEATURES

* Over/Under-voltage protection

* Over-current protection

* Additional protection input

* Fault protection output with open drain output stage

* Open drain power good output signal for power good input

* 300ms power good delay

* 75ms delay for UV/OC protection

* 38ms PSON control de-bounce

* Wide power supply range (3.8V~16V)

* Special care for AC power off