ML4819CS datasheet(2/15 Pages) MICRO-LINEAR

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ML4819

PIN CONFIGURATION

NAME

FUNCTION

NAME

FUNCTION

ISENSE A

Input form the PFC current sense

transformer to the PWM comparator

(+). Current Limit occurs when this

point reaches 5V.

OVP

Input to Over-Voltage comparator.

GM OUT

Output of Gain Modulator. A resistor

to ground on this pin converts the

current to a voltage.

EA OUT A

Output of error amplifier.

INV A

Inverting input to error amplifier.

6ISINE

Current Multiplier input.

DUTY CYCLE PWM controller duty cycle is limited

by setting this pin to a fixed voltage.

PWM B

Error voltage feedback input.

9ISENSE B

Input for Current Sense resistor for

current mode operation or for

Oscillator ramp for voltage mode

operation.

10 RT

Oscillator timing resistor pin. A 5V

source across this resistor sets the

charging current for CT

11 ILIM

Cycle by cycle PWM current limit.

Exceeding 1V threshold on this pin

terminates the PWM cycle.

12 RAMP COMP Buffered output from the Oscillator

Ramp (CT). A resistor to ground sets a

current, 1/2 of which is sourced on

pins 9 and 11.

13 GND B

Return for the high current totem pole

output of the PWM controller.

14 OUT B

PWM controller totem pole output.

15 VCC

Positive Supply for the IC.

16 OUT A

PFC controller totem pole output.

17 GND A

Return for the high current totem pole

output of the PFC controller.

18 VREF

Buffered output for the 5V voltage

reference

19 GND

Analog signal ground.

20 CT

Timing Capacitor for the Oscillator.

PIN DESCRIPTION

ML4819

20-Pin PDIP

ISENSE A

OVP

GM OUT

EA OUT A

INV A

ISINE

DUTY CYCLE

PWM B

ISENSE B

GND

VREF

PGND A

OUT A

VCC

OUT B

PGND B

RAMP COMP

ILIM

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