contact Micrel Semiconductor, contact Datasheet - Page 3

• Manufacturer Part Number: contact
• Description: Bicmos 1a Current-mode Pwm Controllers
• Manufacturer: Micrel Semiconductor

Pin Configuration
Pin Description
April 2005
Pin Number
N, M, MM
1
2
3
4
5
6
7
8
COMP
RT/CT
ISNS
FB
Pin Number
-1BN, -1BM
1
2
3
4
8-Lead SOIC (M)
10
11
12
13
14
1
2
3
4
5
6
7
8
9
8-Pin DIP (N)
MIC38HC4x
Pin Name
COMP
RT/CT
PGND
AGND
VREF
8
7
6
5
ISNS
GND
OUT
VDD
NC
NC
NC
NC
FB
VD
VREF
VDD
OUT
GND
Pin Function
Compensation: Connect external compensation network to modify the error
amplifier output.
Not internally connected.
Feedback (Input): Error amplifier input. Feedback is 2.5V at desired output
voltage.
Not internally connected.
Current Sense (Input): Current sense comparator input. Connect to current
sensing resistor or current transformer.
Not internally connected.
Timing Resistor/Timing Capacitor: Connect external RC network to select
switching frequency.
Ground: Combined analog and power ground.
Power Ground: N-channel driver transistor ground.
Analog Ground: Controller circuitry ground.
Power Output: Totem-pole output.
Power Supply (Input): P-channel driver transistor supply input. Return to
power ground (PGND).
Analog Supply (Input): Controller circuitry supply input. Return to analog
ground (AGND).
Not internally connected.
5V Reference (Output): Connect external RC network.
3
COMP
RT/CT
ISNS
NC
NC
NC
FB
14-Lead SOIC (-1BM)
1
2
3
4
5
6
7
14-Pin DIP (-1BN)
MIC38HC4x-1
14
13
12
11
10
9
8
VREF
NC
VDD
VD
OUT
AGND
PGND
M9999-042205