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NJU7678MLK

Internal 60V, 3A MOSFET Step-Up / Flyback Switching Regulator IC

Japan Radio Corporation  

NJU7678

■BLOCK DIAGRAM

V+

FB

IN-

1V Vref

ER⋅AMP

Soft Start

Latch

UVLO

SCP

1V

2µA

SCP

2kΩ

0.5

A

RT

1V

DTC

0.65V

0.15V

OSC

0.5V

PWM

Buffer

0.6V

RT

RT

GND

DRAIN

DRAIN

DRAIN

SOURCE

SOURCE

SOURCE

SOURCE

The initial soft start time is 4msec. The soft start time can be adjusted by connecting the capacitor with

the DTC pin. The charging current is calculated by 0.5/RT.

The MaxDuty is 90%@700kHz. MaxDuty can be adjusted by connecting resistance with the DTC pin.

MaxDuty is calculated by (RDTC / RT) × 86 - 24.

The short-circuit protection circuit is a timer latch type. The protection Delay time can be adjusted with

the capacitor connected with the SCP pin. To release the latch mode, it should do reclosing the power

supply (below the UVLO detection voltage) or the SCP pin down to GND level.

-2-

Ver.2010-10-26

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