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參數(shù)資料
| 型號： | R1234D281B |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| 中文描述： | 脈寬調(diào)制/ VFM的降壓型DC / DC同步整流變換器 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 876K |
| 代理商： | R1234D281B |
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R1234D
11
When you use these ICs, consider the following issues;
Input same voltage into the power supply pins, V
IN
and V
DD
. Set the same level as AGND and PGND.
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 V
IN
/V
DD
pin.
Set external components such as an inductor, C
IN
, C
OUT
as close as possible to the IC, in particular,
minimize the wiring to V
IN
pin and PGND pin.
At stand by mode, (CE
=
"L"), the L
X
output is Hi-Z, or both P-channel transistor and N-channel transistor of
L
X
pin turn off.
Use an external capacitor C
OUT
with a capacity of 10
μ
F or more, and with good high frequency
characteristics such as tantalum capacitors.
At VFM mode, (MODE
=
"H"), Latch protection circuit does not operate.
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.
Reinforce the V
IN
, PGND, and V
OUT
lines sufficiently. Large switching current may flow in these lines. If the
impedance of V
IN
and PGND lines is too large, the internal voltage level in this IC may shift caused by the
switching current, and the operation might be unstable.
The performance of power source circuits using these ICs extremely depends upon the peripheral circuits.
Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that
the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their
respected rated values.
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PDF描述 |
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| R1234D291A | PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D291B | PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D301A | PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D301B | PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D311A | PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R1234D291A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D291B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D301A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D301B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
| R1234D311A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier |
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