R1234D321B 데이터 시트보기 (PDF) - RICOH Co.,Ltd.

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R1234D321B

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

RICOH Co.,Ltd. 

R1234D

TYPICAL APPLICATION AND TECHNICAL NOTES

1) Fixed Output Voltage Type

1 VIN

CIN

L

Lx 8

2 PGND AGND 7

3 VDD MODE 6

4 CE

5 VOUT

VOUT

LOAD

COUT

CIN

COUT

L

10µF C3216JB0J106M (TDK)

10µF ECSTOJX106R (Panasonic)

10µH LQH3C100K54 (Murata)

2) Adjustable Output Voltage Type

1 VIN

Lx 8

CIN

2 PGND AGND 7

3 VDD MODE 6

4 CE

5 VOUT

L

VOUT

LOAD

COUT

Cb

R1

Rb

R2

CIN

COUT

L

10µF C3216JB0J106M (TDK)

10µF ECSTOJX106R (Panasonic)

10µH LQH3C100K54 (Murata)

VFM mode may work with a parasitic diode, but we recommend that VFM mode used with an external diode in

between LX and GND. As for PWM mode, an external diode is not necessary.

As for how to choose Cb, Rb, R1, and R2 values, refer to the technical notes.

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