ML4818 データシートの表示（PDF） - Micro Linear Corporation
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ML4818 Datasheet PDF : 12 Pages
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ML4818
PIN CONNECTION
24-Pin Power DIP
GND 1
CT 2
RAMP 3
ILIM 4
E/A OUT 5
GND 6
GND 7
INV 8
SOFT START 9
SHUTDOWN 10
RT 11
RCRESET 12
24 VREF
23 GND
22 B1 OUT
21 B2 OUT
20 VCC
19 GND
18 GND
17 A1 OUT
16 A2 OUT
15 GND
14 RDELAY
13 CLOCK
TOP VIEW
GND
CT
RAMP
ILIM
E/A OUT
GND
GND
INV
SOFT START
SHUTDOWN
RT
RCRESET
24-Pin SOIC
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
TOP VIEW
VREF
GND
B1 OUT
B2 OUT
VCC
GND
GND
A1 OUT
A2 OUT
GND
RDELAY
CLOCK
PIN DESCRIPTION
PIN NAME
1 GND
FUNCTION
Ground
2 CT
3 RAMP
Timing capacitor for oscillator
Non-inverting input to main
comparator. Connected to current
sense resistor for current mode
4 ILIM
Current limit sense pin. Normally
connected to current sense resistor
5 E/A OUT
Output of error amplifier and input
to PWM comparator
6,7 GND
Ground and substrate
8 INV
Inverting input to error amp
9 SOFT START Normally connected to soft start
capacitor
10 SHUTDOWN Pulling this pin low puts the IC into
a power down mode and turns off
all outputs. This pin is internally
pulled up to VREF.
11 RT
Resistor which sets discharge
current for oscillator timing
capacitor
PIN NAME
12 RCRESET
13 CLOCK
14 RDELAY
15 GND
16 A2 OUT
17 A1 OUT
18,19 GND
20 VCC
21 B2 OUT
22 B1 OUT
23 GND
24 VREF
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
2
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