參數(shù)資料
型號(hào)： R1232D181B
廠商： Ricoh Co., Ltd.
英文描述： PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
中文描述： PWM降壓型DC / DC變換器的同步整流
文件頁(yè)數(shù)： 9/24頁(yè)
文件大小： 819K
代理商： R1232D181B
R1232D
9
When you use these ICs, consider the following issues;
Input the same voltage into power supply pins, V
IN
and V
DD
. Set the same level as AGND and PGND.
When you control the CE 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.
In terms of the protection circuits, current limit for the peak current of each cycle of Lx, and the latch
protection circuit, which works if the over-limit current flows continuously for a certain time exist. To release
the protection, once make this IC into be standby mode with chip enable pin, or make the supply voltage be
down to UVLO threshold level or less.
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.
Connect the TEST Pin to the "L" or GND level.
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.
相關(guān)PDF資料
PDF描述
R1232D191A PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D191B PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R1232D191A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D191B 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D201A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D201B 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
R1232D211A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
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