MIC9131(2001) 查看數據表（PDF） - Micrel

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产品描述 (功能)

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MIC9131
(Rev.:2001)

High-Voltage, High-Speed Telecom DC-to-DC Controller

Micrel 

MIC9131

Oscillator Frequency vs.

RC Values

1000000

47pF

100pF

100000 220pF

470pF

680pF

1000pF

10000

2200pF

Note:

101000000

100000 1000000 10000000

FREQUENCY (Hz)

Output switching frequency is 1/4 the oscillator frequency.

Micrel

*See applications section for higher

switching frequencies

Functional Block Diagram

FB

COMP OSC

SYNC

7

6

4

5

Oscillator

2

Error 1.2V

Amplifier

ISNS 14

40µA

VBIAS 9 5V

EN 10

RBIAS 3

BIAS

REG

0.82V

1.21V

5V

PWM

Peak

Current Limit

4µA

SS 12

CPWR 8

Max.

Duty Cycle

VCC 2

Q

R1

R2

S

LINE 1

2

SR Latch

R

Q

S1

S2

MAXIMUM DUTY CYCLE

Current

Limit

Selection

VCC

UVLO

1-Shot

UNDERVOLTAGE LOCKOUT

MIC9131

Thermal

Shutdown

13

UVLO

LINE

UVLO

Figure 1

8

VCC

16 OUT

15 PGND

11 AGND

July 2001

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