ML4812
PIN CONFIGURATION
ML4812
20-Pin PLCC (Q20)
ML4812
16-Pin PDIP (P16)
I
1
2
3
4
5
6
7
8
16
C
T
SENSE
GM OUT
EA OUT
EA–
15 GND
14
13
V
V
REF
CC
3
9
2
1 20 19
EA OUT
EA–
4
5
6
7
8
18
17
V
V
REF
CC
OVP
12 OUT
NC
16 NC
OVP
15 OUT
I
11 PWR GND
10 SHDN
SINE
I
14 PWR GND
SINE
RAMP COMP
10 11 12 13
R
9
CLOCK
T
TOP VIEW
TOP VIEW
PIN DESCRIPTION
PIN NAME
FUNCTION
PIN NAME
FUNCTION
1
2
I
Input from the current sense
transformer to the non-inverting input
of the PWM comparator.
8
R
Oscillator timing resistor pin. A 5V
source sets a current in the external
resistor which is mirrored to charge
SENSE
T
C .
T
GM OUT Output of gain modulator.
A resistor to ground on this pin
converts the current to a voltage.
This pin is clamped to 5V and tied
to the inverting input of the PWM
comparator.
9
CLOCK
Digital clock output.
10
SHDN
A TTL compatible low level on this
pin turns off the output.
11
PWR GND Return for the high current totem pole
output.
3
4
5
6
7
EA OUT
EA–
Output of error amplifier.
Inverting input to error amplifier.
Input to over voltage comparator.
Current gain modulator input.
12
13
14
OUT
High current totem pole output.
Positive Supply for the IC.
OVP
V
CC
I
V
REF
Buffered output for the 5V voltage
reference.
SINE
RAMP
COMP
Buffered output from the oscillator
15
16
GND
Analog signal ground.
ramp (C ). A resistor to ground sets the
T
current which is internally subtracted
C
T
Timing capacitor for the oscillator.
from the product of I
and I in
SINE
EA
the gain modulator.
2
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
