MIC38C42BMM データシートの表示（PDF） - Micrel

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MIC38C42BMM

BiCMOS Current-Mode PWM Controllers

Micrel 

MIC38C42/3/4/5

Pin Configuration

MIC38C4x

COMP 1

8 VREF

FB 2

7 VDD

ISNS 3

6 OUT

RT/CT 4

5 GND

Micrel, Inc.

MI C 3 8 C 4 x - 1

COMP 1

NC 2

FB 3

NC 4

ISNS 5

NC 6

RT/CT 7

14 VREF

13 NC

12 VDD

11 VD

10 OUT

9 AGND

8 PGND

8-Pin DIP (N)

8-Pin SOIC (M)

8-Pin MSOP (MM)

Pin Description

Pin Number Pin Number

N, M, MM -1BN, -1BM

1

1

Pin Name

COMP

2

NC

2

3

FB

4

3

5

NC

ISNS

6

NC

4

7

RT/CT

5

GND

8

PGND

9

AGND

6

10

OUT

11

VD

7

12

VDD

13

NC

8

14

VREF

14-Pin DIP (-1BN)

14-Pin SOIC (-1BM)

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.

September 2007

3

M9999-091107

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