MIC38C42A Datasheet, PDF (3/9 Pages) Micrel Semiconductor – BiCMOS Current-Mode PWM Controllers

MIC38C42A/43A/44A/45A
Pin Configuration
MIC38C4xA
COMP 1
8 VREF
FB 2
7 VDD
ISNS 3
6 OUT
RT/CT 4
5 GND
8-Lead SOIC (M)
8-Lead MM8™ (MM)
Micrel, Inc.
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
COMP
FB
ISNS
RT/CT
GND
OUT
VDD
VREF
Pin Function
Compensation: Connect external compensation network to modify the error
amplifier output.
Feedback (Input): Error amplifier input. Feedback is 2.5V at desired output
voltage.
Current Sense (Input): Current sense comparator input. Connect to current
sensing resistor or current transformer.
Timing Resistor/Timing Capacitor: Connect external RC network to select
switching frequency.
Ground: Combined analog and power ground.
Power Output: Totem-pole output.
Analog Supply (Input): Controller circuitry supply input. Return to analog
ground (AGND).
5V Reference (Output): Connect external RC network.
April 2005
3
M9999-042205