KA3504 ,PC SMPS Supervisory ICKA3504PC SMPS Supervisory IC
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KA3504
PC SMPS Supervisory IC
Features PC Power Supply Output Monitor Circuitry Few External Components Over Voltage Protection for 3.3V / 5V / 12V Output Over Current Protection for 3.3V / 5V / 12V Output With
Delay Time Fault Protection Output With Open Collector Output Power Supply On/Off Delay Time Control (PSON) Power Good Signal Generator With Hysteresis Open Collector PG Output 300ms Power Good Delay Current Sense Setting Function With RI Latch Function Controlled by PSON and Protection Input 16-Pin Dual In-line Package
FPO (Fault Protection Output)Fault Protection Output indicates the fault condition as pro-tection signal. When fault state occurs, the main power is to be turned-off and the PGO signal goes LOW.
NORMAL = "LOW", FAULT = "HIGH"
PGO (Power Good Output)Power Good Signal Generator is to monitor the voltage level of power supply for safe operation of a microprocessor hav-ing some delay time at turn-on. The delay time is prorammed by a timing capacitor connected to TPG pin of KA3504. The power good output should be low state before the output volt-age is out of regulation at turn-off.
NORMAL = "HIGH", FAULT = "LOW"
DescriptionThe KA3504 is complete output supervisory circuitry intended for use in the secondary side of the switched modepower supply. It provides all the functions necessary to monitor and control the output of the power supply system.Power good signal generator, Remote on and off control,some precision protection features against over-voltage andover-current are implemented. It directly senses all the outputrails for OVP without any external dividers. As for outputcontrol, Power Good Output (PGO) and Fault Protection Out-put (FPO) are also included. Utilizing a minimum number ofexternal components, the KA3504 offers a simple and cost effective solution, greatly reducing PCB board space forpower supply system.
OCP (Over Current Protection)It has precision OCP functions for +3.3V, +5V, +12V outputs. The block is made up of three comparators with current source setting function. Two inputs of each OCP comparator are connected to both sides of output inductor that is located in the secondary output of SMPS.
OVP (Over Voltage Protection)It has OVP functions for +3.3V, +5V, +12V outputs. The circuit is made up of a comparator with three detecting inputs.
Remote ON/OFFRemote on/off section is used to control SMPS externally. If a high signal is supplied to the remote on/off input, FPO signal becomes a high state and all secondary outputs are grounded. The remote on/off signal is transferred with some on-delay and off-delay time of 8ms, 24ms respectively with 0.1mF external capacitor.
