ML4819
PIN CONFIGURATION
ML4819
20-Pin PDIP
I
SENSE
A
OVP
GM OUT
EA OUT A
INV A
I
SINE
DUTY CYCLE
PWM B
I
SENSE
B
R
T
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
C
T
GND
V
REF
PGND A
OUT A
V
CC
OUT B
PGND B
RAMP COMP
I
LIM
TOP VIEW
PIN DESCRIPTION
PIN
NAME
FUNCTION
PIN
NAME
FUNCTION
1
I
SENSE
A
Input form the PFC current sense
transformer to the PWM comparator
(+). Current Limit occurs when this
point reaches 5V.
Input to Over-Voltage comparator.
Output of Gain Modulator. A resistor
to ground on this pin converts the
current to a voltage.
Output of error amplifier.
11 I
LIM
Cycle by cycle PWM current limit.
Exceeding 1V threshold on this pin
terminates the PWM cycle.
2
3
OVP
GM OUT
12 RAMP COMP Buffered output from the Oscillator
Ramp (C
T
). A resistor to ground sets a
current, 1/2 of which is sourced on
pins 9 and 11.
13 GND B
14 OUT B
Return for the high current totem pole
output of the PWM controller.
PWM controller totem pole output.
Positive Supply for the IC.
PFC controller totem pole output.
Return for the high current totem pole
output of the PFC controller.
Buffered output for the 5V voltage
reference
Analog signal ground.
Timing Capacitor for the Oscillator.
4
5
6
7
8
9
EA OUT A
INV A
I
SINE
Inverting input to error amplifier.
Current Multiplier input.
15 V
CC
16 OUT A
17 GND A
18 V
REF
19 GND
20 C
T
DUTY CYCLE PWM controller duty cycle is limited
by setting this pin to a fixed voltage.
PWM B
I
SENSE
B
Error voltage feedback input.
Input for Current Sense resistor for
current mode operation or for
Oscillator ramp for voltage mode
operation.
Oscillator timing resistor pin. A 5V
source across this resistor sets the
charging current for C
T
10 R
T
2
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
