KA3511D データシートの表示（PDF） - Fairchild Semiconductor
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KA3511D Datasheet PDF : 21 Pages
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INTELLIGENT VOLTAGE MODE PWM IC
KA3511/D
GENERAL DESCRIPTION
The KA3511/D is a fixed-frequency improved-
performance pulse-width modulation control circuit
with complete housekeeping circuitry for use in the
secondary side of SMPS (Switched mode power
supply). It contains various functions, which are
precision voltage reference, over voltage protection,
under voltage protection, remote on/off control, power
good signal generator and etc.
22-DIP-400 / 24-SOP-300
OVP (Over voltage protection) section
It has OVP functions for +3.3V,+5V,+12V and PT
outputs. The circuit is made up of a comparator with
four detecting inputs and without hysteresis voltage.
Especially, PT (Pin16) 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.
Remote on/off section
Remote on/off section is used to control SMPS
externally. If a high signal is supplied to the remote on/
off input, PWM 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.
Precision reference section
The reference voltage trimmed to ± 2%
(4.9V≤Vref≤5.1V)
PG (Power good signal generator) section
Power good signal generator is to monitor the voltage
level of power supply for safe operation of a
microprocessor.
KA3511 requires few external components to
accomplish a complete housekeeping circuits for
SMPS. The KA3511 is available in a 22-pin dual in-line
package.
ORDERING INFORMATION
Device
KA3511
KA3511D
Package
22 DIP
24 SOP
Operating Temperature
-25°C ~ 85°C
-25°C ~ 85°C
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
• One more external input for various protection
(PT)
• Remote on/off control function (PS-ON)
• Latch function controlled by remote and protection
input
• Power good signal generator with hysteresis
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