HA16114FP View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

View to exact match

HA16114FP

Switching Regulator for Chopper Type DC/DC Converter

Hitachi -> Renesas Electronics 

Application Examples (2)

HA16114P/PJ/FP/FPJ, HA16120FP/FPJ

• External Synchronization with Primary-Control AC/DC Converter

(1) Combination with a flyback AC/DC converter (simplified schematic)

HRA83

Commer-

cial AC

+

1S2076A

−

+

Error amp. VIN

−

OUT

+

CL(CS)

Transformer

1S2076A

HRP24

D SBD

R1

+

−

R2

2

SYNC

VIN 10

HA16114,

HA16120 CL 11

GND OUT P.GND

1

9

8

+

Main DC

output

−

Primary AC/DC converter IC

(HA16107, HA17384, etc.)

To A of SBD

2SJ296

Step-down

output

(HA16114)

K

A SBD

HRP24

+

+ Sub DC

− output

−

This is one example of a circuit that uses the features of the HA16114/120 by operating in

synchronization with a flyback AC/DC converter. Note the following design points concerning the

circuit from the secondary side of the transformer to the SYNC pin of the HA16114/120.

• Diode D prevents reverse current. Always insert a diode here. Use a general-purpose switching

diode.

• Resistors R1 and R2 form a voltage divider to ensure that the input voltage swing at the SYNC pin

does not exceed Vref (2.5 V). To maintain operating speed, R1 + R2 should not exceed 10 kΩ.

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