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R1234D151B Datasheet(PDF) 10 Page - RICOH electronics devices division

Part # R1234D151B
Description  PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R1234D151B Datasheet(HTML) 10 Page - RICOH electronics devices division

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R1234D
10
TYPICAL APPLICATION AND TECHNICAL NOTES
1) Fixed Output Voltage Type
L
VOUT
CIN
COUT
LOAD
Lx
VIN
CE
VOUT
MODE
VDD
AGND
PGND
1
2
3
4
8
7
6
5
CIN
10
µF C3216JB0J106M (TDK)
COUT
10
µF ECSTOJX106R (Panasonic)
L
10
µH LQH3C100K54 (Murata)
2) Adjustable Output Voltage Type
L
VOUT
CIN
COUT
Cb
R1
R2
LOAD
Rb
Lx
VIN
CE
VOUT
MODE
VDD
AGND
PGND
1
2
3
4
8
7
6
5
CIN
10
µF C3216JB0J106M (TDK)
COUT
10
µF ECSTOJX106R (Panasonic)
L
10
µH 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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