ML4821
PIN CONNECTION
ML4821
20-Pin SOIC (S20)
ML4821
18-Pin DIP (P18)
I
1
2
20
19
18
17
16
15
14
13
12
11
GND
LIM
I
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
GND
LIM
IA OUT
IA–
C
V
V
T
IA OUT
IA–
C
V
V
T
3
REF
CC
REF
CC
IA+
4
IA+
I
5
OUT
SINE
I
OUT
SINE
EA OUT
EA–
6
PGND
EA OUT
EA–
PGND
7
R
T
R
T
V
8
OVP
SYNC
N/C
RMS
V
OVP
RMS
SOFT START
N/C
9
SOFT START
SYNC
10
TOP VIEW
TOP VIEW
PIN DESCRIPTION (Pin numbers in parentheses are for 20-pin packages)
PIN
NAME
FUNCTION
PIN
NAME
FUNCTION
1 (1)
I
Peak cycle-by-cycle current limit input
10 (12) SYNC
11 (13) OVP
Oscillator synchronization input
LIM
2 (2) IA OUT Output and compensation node of the
average current error amplifier
Inhibits output pulses when the
voltage at this pin exceeds 5V. Also,
when the voltage at this pin is less
than 0.7V, the IC goes into low current
shut-down mode.
3 (3) IA–
Inverting input of the average current
error amplifier
4 (4) IA+
Non-Inverting input of the average
current error amplifier and output of
the gain modulator
12 (14) R
Timing resistor for the oscillator
T
13 (15) PWR
GND
Return for the high current totem
pole output
5 (5)
I
Gain modulator input
SINE
14 (16) OUT
High current totem pole output
Positive supply for the IC
15 (17) V
CC
6 (6) EA OUT Output of output voltage error
amplifier
16 (18) V
Buffered output for the 5V voltage
reference
REF
7 (7) INV
8 (8)
Inverting input to error amplifier
17 (19) C
Timing capacitor for the oscillator.
Analog signal ground
T
V
RMS
Input for average line voltage
compensation
18 (20) GND
9 (9) SOFT
Normally connected to soft start
START capacitor
2
Micro Linear
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
