Preliminary Datasheet

CURRENT MODE PWM CONTROLLER FOR BJT

AP3720

Jul. 2009 Rev. 1. 0

BCD Semiconductor Manufacturing Limited

3

Functional Block Diagram

Skip

OLP

VF4

VF2

VF3

Duty

PWM

Comp

CS

FB

Slope Compensation

R

S

OSC

65K/20K

Q

Drive

OCP

V2

COMP

COMP

COMP

COMP

Line

compensation

DRV

Regulator

&UVLO

Internal

Supply

VCC

GND

LINE

OLP

OTP

Fault

Protect

Logic

Skip

Vref&Vbias

VF4

VF3

VF2

K1

OVP

V1

COMP

OVP

BIAS

1

3

4

5

6

7

8

Figure 3. Functional Block Diagram of AP3720

Ordering Information

AP3720

-

Package

Temperature

Range

Part Number

Marking ID

Packing Type

DIP-8

AP3720P-G1

AP3720P-G1

Tube

SOIC-8

-40 to 85

°C

AP3720MTR-G1

3720M-G1

Tape & Reel

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant

and green.

G1: Green

Circuit Type

Package

P: DIP-8

M: SOIC-8

TR: Tape and Reel

Blank: Tube