S3515

DESCRIPTION

The UTC S3515 is specially designed for switching power supply

system. It provides over-voltage protection, over-current protection,

under-voltage protection, on/off control and power good signal generating.

OVP/UVP (Over/Under-Voltage Protection) monitors 3.3V, 5V and

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

one of these supply voltages exceeds their normal operation voltage

range.

OCP (Over Current Protection) monitors IS33, IS5, IS12 input

current. The voltage difference across external current shunt is used for

OCP functions. An external resistor which is connected between the RI

pin and the GND pin can be used to adjust protection threshold. To

achieve better immunity for lighting surge glitch and to prevent

accidental power shut down during dynamic loading condition, the

de-bounce time for UVP/OCP is 73us respectively. The deglitch time for

OVP is 73uS for better noise immunity.

The power supply is turned on after 38mS de-bounce time when

PSON signal is set from high to low. To turn off power supply, PSON

signal is set from low to high and the de-bounce time is 115mS. When

PGI input voltage level is lower than the internal 1.15V reference

voltage, after 73uS de-bounce time, the PGO signal is pulled low.

FEATURES

* Over/Under-Voltage Protection for 3.3V, 5V, and Two 12V

* Over-Current Protection for 3.3V, 5V, and Two 12V

* PGO and FPO pins with Open Drain Output Stage

* 300mS Power Good Delay from PGI to PGO

* 75mS Delay for 3.3V, 5V and 12V Power Turn on

* 2.8mS Delay for PSON Control to FPO Turn off

* 38mS / 115mS PSON on/off De-Bounce Time

* 73uS width Noise Deglitches

* 73uS De-Bounce Time for UVP and OCP

* Wide Supply Voltage Range

规格书S3515