FSDH321, FSDL321

www.onsemi.com

2

ORDERING INFORMATION

Product Number

Package

Marking Code

BVDSS

fOSC

RDS(ON)

Shipping

FSDH321

8DIP

DH321

650 V

100 KHz

14

W

3000 / Tube

FSDL321

8DIP

DL321

650 V

50 KHz

14

W

3000 / Tube

Table 1. OUTPUT POWER TABLE

Product

230VAC

+15%

(Note 3)

85−265VAC

Adapter

(Note 1)

Open

Frame

(Note 2)

Adapter

(Note 1)

Open

Frame

(Note 2)

FSDL321

11 W

17 W

8 W

12 W

FSDH321

11 W

17 W

8 W

12 W

1. Typical continuous power in a non−ventilated enclosed adapter

with sufficient drain pattern as a heat sinker, at 50

°C ambient.

2. Maximum practical continuous power in an open frame design

with sufficient drain pattern as a heat sinker, at 50

°C ambient.

3. 230 VAC or 100/115 VAC with doubler.

Figure 1. Typical Flyback Application

AC

IN

+

+

+

Ipk

Vstr

Drain

Vfb

Vcc

Source

DC

OUT

PWM

Figure 2. Functional Block Diagram of FSDx321

Vfb

Ipk

3

4

+

−

+

−

+

−

+

−

VBURH

VBURL/VBURH

Vcc

Vcc

IDELAY

IFB

VSD

Vcc

Vovp

TSD

2.5R

R

Burst

Normal

Vcc good

Vcc

Vcc

Vstr

Drain

+

−

Vcc good

Vref

Internal

Bias

2

5

6,7,8

1 GND

Vocp

+

−

PWM

8 V/12 V

IBUR(pk)

Freq.

Modulation

ICH

OSC

LEB

Gate

Driver

+

−

+

S

R

Q

Q

S

R

Q

Q

Soft

Start

AOCP