© 2008 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN7387 Rev. 1.0.0

2

Typical Application Diagrams

Figure 1. Typical Application Circuit for SMPS (Self Oscillation Method)

Figure 2. Typical Application Circuit for SMPS Using External Signal

VDD

RDT

CT

RT2

D1

R1

R2

M1

M2

C3

C4

D2

VDD

RCT

VB

HO

VS

LO

GND

8

7

6

5

1

2

3

4

DT/ SD

GND

C1

C2

VDC

D3

C5

C6

Shutdown

Q1

RT1

Frequency

Control

Q2

FAN7387 Rev1.0

Cb*

* Note: This capacitor, Cb, is for system stability and must use at least 470nF.

VDD

Q2

RDT

D1

R3

R4

M1

M2

C3

C4

D2

VDD

RCT

VB

HO

VS

LO

GND

8

7

6

5

1

2

3

4

DT/ SD

GND

C1

C2

VDC

D3

C5

C6

PWM

Shutdown

Q1

R2

R1

FAN7387 Rev.1.0

* Note: This capacitor, Cb, is for system stability and must use at least 470nF.

Cb*