KA3511DS

KA3511DS Datasheet

AN4003 PC POWER SUPPLY DESIGN WITH KA3511

Part	Datasheet
KA3511DS	KA3511DS (pdf)

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November 2,1999 AN4003 PC POWER SUPPLY DESIGN WITH KA3511 Sang-Tae Im The KA3511 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. 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 Package 22 DIP Operating Temperature -25°C ~ 85°C • 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 • 22-Pin dual in-line package BLOCK DIAGRAM 22-DIP-400 V5 V12 RT 7 CT 8 COMP 2 E/A - E/A + DEAD TIME CONTROL 12 VREF VCC 1 OSCILLATOR PWM CONTROL DQ CK Q 1.25V DEAD TIME CONTROLLER 0.1V INTERNAL BIAS VREF Start Up COMP1 5V VREF Ichag PG GENERATOR DELAY CONTROLLER REMOTE ON/OFF 1.4V VREF OVP COMP 1.25V DET 9 COMP2 1.25V COMP3 1.8V 0.6V 1.8V 0.6V UVP COMP 1.25V 10 TPG 2.2uF TUVP 2.2uF 18 GND 22 C1

PDF Datasheet Preview

November 2,1999

AN4003 PC POWER SUPPLY DESIGN WITH KA3511

Sang-Tae Im

The KA3511 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. 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

Package 22 DIP

Operating Temperature -25°C ~ 85°C
• 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
• 22-Pin dual in-line package

BLOCK DIAGRAM
22-DIP-400

V5 V12

RT 7 CT 8

COMP 2

E/A -

E/A +

DEAD TIME CONTROL
12 VREF

VCC 1

OSCILLATOR

PWM CONTROL

DQ CK Q
1.25V

DEAD TIME CONTROLLER
0.1V

INTERNAL BIAS

VREF

Start Up

COMP1 5V

VREF Ichag

PG GENERATOR

DELAY CONTROLLER REMOTE ON/OFF
1.4V

VREF OVP COMP 1.25V

DET 9

COMP2 1.25V

COMP3 1.8V 0.6V 1.8V
0.6V

UVP COMP
1.25V
10 TPG
2.2uF

TUVP 2.2uF
18 GND
22 C1

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Datasheet ID: KA3511DS 634111