NJU7680

- 3 -

Ver.2010-03-31

■BLOCK DIAGRAM

0.5V

OSC

2

µA

UVLO

0.8V

0.2V

OUT1

GND

RT

IN-1

FB1

PWM1

ER

⋅AMP1

Regulator

2V

DTC_COMP1

Buffer1

SST1

V

+

VREG

SCP

SCP

ON/OFF

CE2

CE1

RT_ON

DTC1

OUT2

IN-2

FB2

PWM2

ER

⋅AMP2

DTC_COMP2

Buffer2

SST2

DTC2

RT_ON

SW

CH1

CH2

V

+

2k

Ω

1V

1V

Vref

1V

V

+

•On/Off Function

The On/Off switch for each channel is controlled by CE pin.

→ Setting the CE low will turn off all applicable channels’ circuit.

→ Turning off both channels will turn off all circuit.

→ Opening the RT pin will turn off all circuit regardless of input signals from CE pin.

Input Signal

Operating State

RT

CE1

CE2

CH1

CH2

H

H

H

ON

ON

H

H

L

ON

OFF

H

L

H

OFF

ON

H

L

L

L

H

H

L

H

L

L

L

H

L

L

L

OFF

Standby Mode