ml4818 Microsemi Corporation, ml4818 Datasheet - Page 2

• Manufacturer Part Number: ml4818
• Description: Phase Modulation/soft Switching Controller
• Manufacturer: Microsemi Corporation

ML4818
PIN CONNECTION
PIN DESCRIPTION
2
PIN
6,7
10
11
1
2
3
4
5
8
9
NAME
GND
C
RAMP
I
E/A OUT
GND
INV
SOFT START
SHUTDOWN Pulling this pin low puts the IC into
R
LIM
T
T
SHUTDOWN
SOFT START
E/A OUT
RC
RAMP
GND
GND
GND
RESET
I
INV
LIM
C
R
24-Pin Power DIP
T
T
FUNCTION
Ground
Timing capacitor for oscillator
Non-inverting input to main
comparator. Connected to current
sense resistor for current mode
Current limit sense pin. Normally
connected to current sense resistor
Output of error amplifier and input
to PWM comparator
Ground and substrate
Inverting input to error amp
Normally connected to soft start
capacitor
a power down mode and turns off
all outputs. This pin is internally
pulled up to V
Resistor which sets discharge
current for oscillator timing
capacitor
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
GND
B1 OUT
B2 OUT
V
GND
GND
A1 OUT
A2 OUT
GND
R
CLOCK
REF
DELAY
REF
CC
.
18,19 GND
PIN
12
13
14
15
16
17
20
21
22
23
24
SHUTDOWN
SOFT START
NAME
RC
CLOCK
R
GND
A2 OUT
A1 OUT
V
B2 OUT
B1 OUT
GND
V
E/A OUT
DELAY
CC
REF
RC
RESET
RAMP
GND
GND
GND
RESET
I
INV
LIM
C
R
T
T
10
11
12
1
2
3
4
5
6
7
8
9
FUNCTION
Timing elements for Integrating fault
detection and reset delay circuits
Oscillator output
Resistor to ground on this pin
programs the amount of delay from
the time an output turns off until its
complementary output turns on
Ground
High current totem pole output A1
High current totem pole output A2
Ground and substrate
Positive supply for the IC
High current totem pole output B1
High current totem pole output B2
Ground
Buffered output for the 5V voltage
reference
24-Pin SOIC
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
V
GND
B1 OUT
B2 OUT
V
GND
GND
A1 OUT
A2 OUT
GND
R
CLOCK
DELAY
REF
CC