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FAN7585 Datasheet

  • FAN7585

  • Intelligent Voltage Mode PWM IC

  • 16頁(yè)

  • FAIRCHILD

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www.fairchildsemi.com
FAN7585
Intelligent Voltage Mode PWM IC
Features
Complete PWM Control and House Keeping Circuitry
Few External Components
Precision Voltage Reference Trimmed to 2%
Dual Output for Push-Pull Operation
Each Output TR for 200mA Sink Current
Variable Duty Cycle by Dead Time Control
Soft Start Capability by Using Dead Time Control
Double Pulse Suppression Logic
Over Voltage Protection for 3.3V/5V/12V
Under Voltage Protection for 3.3V/5V/12V
Over Current Protection for 3.3V/5V/12V
One More External Input for Various Protection (PT)
Remote On/Off Control Function (PS-ON)
Latch Function Controlled by Remote and Protection
Input
鈥?Power Good Signal Generator with Hysteresis
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Description
The FAN7585 is a fixed frequency improved performance
pulse width modulation control circuit with complete house-
keeping circuitry for use in the secondary side of SMPS
(Switched Mode Power Supply). It contains various func-
tions, which are overvoltage protection, undervoltage protec-
tion, over current protection, remote on/off control, power
good signal generator, etc.
OVP (Over Voltage Protection) Section
It has OVP functions for +3.3V,+5V,+12V outputs and PT.
The circuit is made up of a comparator with four detecting
inputs and without hysteresis voltage. Especially, PT (Pin19)
is prepared for an extra OVP input or another protection
signal.
UVP (Under Voltage Protection) Section
It also has UVP functions for +3.3V, +5V, +12V outputs. The
block is made up of a comparator with three detecting inputs
and without hysteresis voltage.
Typical Application
鈥?PC Power Supply
OCP (Over Current Protection) Section
It has precision OCP functions for +3.3V, +5V, +12V out-
puts. 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 current sensing inductor that is
located in the secondary output of SMPS.
Remote On/Off Section
The remote on/off section is used to control SMPS exter-
nally. If a high signal or open state is supplied to the remote
on/off input, PWM signal becomes a high state and all sec-
ondary outputs are grounded. The remote on/off signal is
transferred with some on-delay and off-delay time of 8ms,
24ms respectively.
24-SDIP
Precision Reference Section
1
The reference voltage is trimmed to
鹵2%.
(4.9V
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Vref
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5.1V)
PG (Power Good Signal Generator) Section
The 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 power good output
should be low state before the output voltatge is out of regu-
lation at turn-off.
Rev. 1.0.0
漏2003 Fairchild Semiconductor Corporation

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