Technical Note

5/11

BD5650AFVM

www.rohm.com

2011.11 - Rev.B

© 2011 ROHM Co., Ltd. All rights reserved.

●

Typical application

Fig.16

VOUT = VREF × (R1+R2) / R2 [V]

CURRENT LIMIT : IL = VSE / RS [A]

Recommended part list

Symbol

Products

Recommended value

C0

UD Series (Nichikon)

220 ～ 1000μF

C1

UD Series (Nichikon)

100 ～ 680μF

C21

MCH182CN104 (Rohm)

0.1μF

CP

-

(Tolerence B)

R1

MCR03 (Rohm)

160k (Tolerence F)

R2

MCR03 (Rohm)

51k (Tolerence F)

R3

MCR03 (Rohm)

470

R21

MCR03 (Rohm)

1k

R22

MCR03 (Rohm)

470

RS

MCR25 (Rohm)

0.3 (Tolerence F)

D1

SB240

-

PC

PC17K1DD (KODENSHI)

-

Caution in use

We are convinced that an example above application circuit is no problem, but you should sufficiently evaluate the

characteristics for your application. You need to decide external values sufficiently considering static characteristics,

transient characteristics and IC’s unevenness to keep working application margin when you use in change external circuit

value. You need to evaluate when you decide external value, since the frequency response in overall system is affected in

particular from not IC only but characteristics of optocoupler and primary side control IC.

-

+

-

VREF

+

-

+

5

3

1

2

Comparator

with latch

VOLTAGE

REFERENCE

6

VREF

8

Ichg

73mV detection

Comparator

7

4

RS

Δ

VS

470uF

/10V

1000pF

PC

R1

R2

CP

Vout

0.1uF

1k

IL

Error amplifier

D1

L1

R3

C21

R21

R22

Set divided resistance

at output voltage your

request.

Recommended use F

grade.

P.6

Phase compensation parts

for

voltage

controlled

amplifier.

P.6

Set at limit current

your request.

Set

delay time from

over-current detection to

protection latch.

P.7

P.7