SG3526 查看數據表（PDF） - ON Semiconductor

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SG3526

Pulse Width Modulation Control Circuit

ON Semiconductor 

SG3526

APPLICATIONS INFORMATION

C*

VCC

27

17 Reference 18

Regulator

Vref

+

15

10μF

Gnd

* May be required with some types of transistors

Figure 13. Extending Reference

Output Current Capability

R3

Vref

R2

Gnd

1+

R2

Vref

2−

R3

R1

Positive

Output

Voltage Gnd

Negative

R1

Output

Voltage

1+

2−

Vout = Vref

R1 + R2

R2

R3 =

R1R2

R1 + R2

Vout = Vref

R1

R2

Figure 14. Error Amplifier Connections

11

SG3526

12

Sync

RD

9

10

RT

CT

Figure 15. Oscillator Connections

Output to Load

−6

8

+7

+

RS

R1

Vout

I(max) =

Gnd

Vout R1

0.1 V + R1 + R2

RS

R2

−

ISC =

0.1 V

RS

Figure 16. Foldback Current Limiting

+ Error 1

− Error 2

Reset 5

+

Error

− Amp

Vref

100

μA

Q1

Ramp

−

PWM

+

Q2

+12V

14

VC A 13

SG3526

B 16

Gnd

To

Q3

Undervoltage

Lockout

CSoft−Start

Figure 17. Soft−Start Circuity

The totem pole output drivers of the SG3526 are ideally

suited for driving the input capacitance of power FETs at

high speeds.

Figure 18. Driving VMOS Power FETs

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