R1234D321B データシートの表示（PDF） - RICOH Co.,Ltd.

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R1234D321B

PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier

RICOH Co.,Ltd. 

TEST CIRCUITS

1 VIN

Lx 8

R1234D

Series

3 VDD

CE 4

7 AGND 5 VOUT

A

2 PGND MODE 6

R1234D

1 VIN

Lx 8

R1234D

Series

3 VDD

CE 4

7 AGND 5 VOUT

2 PGND MODE 6

OSCILLOSCOPE

Test Circuit for Input Current and Leakage Current Test Circuit for Input Voltage and UVLO voltage

1 VIN

Lx 8

R1234D

Series

3 VDD

CE 4

7 AGND 5 VOUT

OSCILLOSCOPE

VOUT

L

10µF

2 PGND MODE 6

Test Circuit for Output Voltage, Oscillator Frequency, Soft-Starting Time

1 VIN

Lx 8

R1234D

Series

A

3 VDD

CE 4

7 AGND 5 VOUT

2 PGND MODE 6

1 VIN

Lx 8

R1234D

Series

3 VDD

CE 4

OSCILLOSCOPE

A

7 AGND 5 VOUT

2 PGND MODE 6

Test Circuit for Supply Current and Standby Current

Test Circuit for ON resistance of LX,

Limit Voltage, Delay Time of Protection Circuit

The bypass capacitor between power supply and GND is a ceramic capacitor 10µF.

9

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