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Fairchild - PC SMPS Supervisory IC

Numéro de référence KA3505
Description PC SMPS Supervisory IC
Fabricant Fairchild 
Logo Fairchild 





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KA3505 fiche technique
KA3505
PC SMPS Supervisory IC
www.fairchildsemi.com
Features
• PC Power Supply Output Monitor Circuitry
• Few External Components
• Over Voltage Protection for 3.3V/5V/12V Output
• Under Voltage Protection for 3.3V/5V/12V Output With
Delay Time
• 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
protection 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
having some delay time at turn-on. The delay time is
programmed by a timing capacitor connected to TPG pin of
KA3505. The power good output should be low state before
the output voltage is out of regulation at turn-off.
NORMAL = "HIGH", FAULT = "LOW"
Description
The KA3505 is complete output supervisory circuitry
intended for use in the secondary side of the switched mode
power 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,
under-voltage and over-current are implemented. It directly
senses all the output rails for OVP and UVP without any
external dividers. As for output control, Power Good Output
(PGO) and Fault Protection Output (FPO) are also included.
Utilizing a minimum number of external components, the
KA3505 offers a simple and cost effective solution, greatly
reducing PCB board space for power 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.
UVP (Under Voltage Protection)
It also has UVP functions for +3.3V, +5V, +12V outputs. The
block is made up of a comparator with three detecting inputs.
Remote ON/OFF
Remote 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
0.1µF external capacitor.
16-DIP
1
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.1

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