ml4823 Fairchild Semiconductor, ml4823 Datasheet - Page 2

• Manufacturer Part Number: ml4823
• Description: High Frequency Power Supply Controller
• Manufacturer: Fairchild Semiconductor

ML4823
PIN CONFIGURATION
PIN DESCRIPTION
2
1 (2)
2 (3)
3 (4)
4 (5)
5 (7)
6 (8)
7 (9)
8 (10) SS
PIN
NAME
INV
NI
E/A OUT Output of error amplifier and input to
CLOCK
R
C
RAMP
T
T
E/A OUT
CLOCK
RAMP
INV
16-PIN SOIC (S16W)
C
NI
R
SS
T
T
16-PIN DIP (P16)
FUNCTION
Inverting input to error amp.
Non-inverting input to error amp.
main comparator.
Oscillator output.
Timing resistor for oscillator — sets
charging current for oscillator timing
capacitor (pin 6).
Timing capacitor for oscillator.
Non-inverting input to main
comparator. Connected to C
Voltage mode operation or to current
sense resistor for current mode.
Normally connected to soft start
capacitor.
ML4823
TOP VIEW
1
2
3
4
5
6
7
8
(Pin Numbers in Parentheses are for PLCC Version)
16
15
14
13
12
11
10
9
5.1V REF
V
OUTPUT
V
PWR GND
I
GND
I
LIM
LIM
CC
C
/S.D.
REF
T
for
9 (12) I
10 (13) GND
11 (14) I
12 (15) PWR GND Return for the high current totem
13 (17) V
14 (18) OUT B
15 (19) V
16 (20) 5.1V REF
PIN
E/A OUT
NAME
CLOCK
LIM
LIM
C
CC
NC
C
/S.D.
R
REF
T
T
4
5
6
7
8
20-PIN PLCC (Q20)
3
9
FUNCTION
Current limit sense pin. Normally
connected to current sense resistor.
Analog signal ground.
Reference input for cycle-by-cycle
current limit comparator.
pole output.
Positive supply for the high current
totem pole output.
High current totem pole output.
Positive supply for the IC.
Buffered output for the 5.1V voltage
reference.
10
2
ML4823
TOP VIEW
11
1
20
12
19
13
18
17
16
15
14
REV. 1.0 10/12/2000
OUTPUT
V
NC
PWR GND
I
LIM
C
REF