R1230D001B-TL 데이터 시트보기 (PDF) - RICOH Co.,Ltd.
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R1230D001B-TL Datasheet PDF : 20 Pages
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n TYPICAL APPLICATION AND TECHNICAL NOTES
1) Fixed Output Voltage Type
VIN
Lx
L
CIN
PGND
AGND
VDD
CE
MODE
VOUT
VOUT
LOAD
COUT
L : 10µH LQH3C100K54 (Murata)
COUT: 10µF ECSTOJX106R (Panasonic)
CIN : 10µF C3216JB0J106M (TDK)
2) Adjustable Output Voltage Type
VIN
LX
CIN
PGND
AGND
VDD
MODE
CE
VFB
L
VOUT
R1
Cb
COUT
Rb
R2
LOAD
L : 10µH LQH3C100K54 (Murata)
COUT: 10µF ECSTOJX106R (Panasonic)
CIN : 10µF C3216JB0J106M (TDK)
As for how to choose Cb, Rb, R1, and R2 values, refer to the technical notes.
When you use these ICs, consider the following issues;
l Input same voltage into Power Supply pins, VIN and VDD. Set the same level as AGND and PGND.
l When you control the CE pin and MODE pin by another power supply, do not make its "H" level more than the voltage
level of VIN / VDD pin.
l Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular, minimize the
wiring to VIN pin and PGND pin.
l At stand by mode, (CE=”L”), the Lx output is Hi-Z, or both P-channel transistor and N-channel transistor of Lx pin turn
off.
l Use an external capacitor COUT with a capacity of 10µF or more, and with good high frequency characteristics such
as tantalum capacitors.
l At VFM mode, (MODE=”H”), Latch protection circuit does not operate.
l If the mode is switched over into PWM mode from VFM mode during the operation, change the mode at light load
current. If the load current us large, output voltage may decline.
Rev. 1.17
- 8-
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