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參數(shù)資料
| 型號： | R1230D181D-TR |
| 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同步整流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 881K |
| 代理商： | R1230D181D-TR |
Rev. 1.12 - 8 -
I
TYPICAL APPLICATION AND TECHNICAL NOTES
1) Fixed Output Voltage Type
C
IN
C
OUT
AGND
MODE
V
OUT
CE
V
DD
PGND
Lx
V
IN
LOAD
L
V
OUT
L : 10
μ
H LQH3C100K54(Murata)
C
OUT
: 10
μ
F ECSTOJX106R(Panasonic)
C
IN
: 10
μ
F C3216JB0J106M(TDK)
2) Adjustable Output Voltage Type
Rb
Cb
C
IN
C
OUT
AGND
MODE
V
FB
CE
V
DD
PGND
L
X
V
IN
LOAD
R1
R2
L
V
OUT
L:
C
OUT
:
C
IN
:
10
μ
H LQH3C100K54 (Murata)
10
μ
F ECSTOJX106R (Panasonic)
10
μ
F C3216JB0J106M (TDK)
Standard value of the sum of Divider Resistors, R1+R2 is as much as 100k
.
Cb value for phase compensation depends on values of L, C, and R1. Refer to the technical notes.
If a ceramic capacitor is used as an output capacitor, add 0.2
or more resistance to compensate the ESR of the
capacitor.
When you use these ICs, consider the following issues;
G
Input same voltage into Power Supply pins, V
IN
and V
DD
. Set the same level as AGND and PGND.
G
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.
G
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.
G
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.
G
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.
G
At VFM mode, (MODE=”H”), Latch protection circuit does not operate.
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