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參數(shù)資料
| 型號： | RN5RY301 |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | VFM STEP-UP DC/DC CONVERTER CONTROLLER |
| 中文描述： | 衡工量值式升壓型DC / DC變換器控制器 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大小： | 117K |
| 代理商： | RN5RY301 |
APPLICATION HINTS
RN5RY
××
1
12
L1
D1
V
OUT
CE
GND
V
OUT
V
IN
+
C2
+
C1
+
C3
Cb
Rb
Q1
EXT
RN5RY
××
1
TYPICAL APPLICATIONS
Components : Inductor (L1)
: CD105
Diode (D1)
: D1FS4A (Schottky Type)
Capacitor (C1)
: 33μF (Tantalum Type)
Capacitor (C2)
: 47μF (Tantalum Type)
Capacitor (C3)
: 47μF (Tantalum Type)
Transistor (Q1)
: 2SD1628G
Base Resistor (Rb)
: 220
Base Capacitor (Cb)
: 2200pF
A spike-shaped voltage higher than output voltage may be applied to the driver transistor. Therefore, care should be
paid regarding its absolute maximum ratings (V
DS
, V
CF
). We recommend to use a transistor having absolute maxi-
mum ratings of at least twice the set output voltage.
We also recommend the use of an output capacitor with an allowable voltage which is at least 1.5 times the set out-
put voltage. This is because there may be the case where a spike-shaped voltage higher than the set output voltage
is generated.
Use capacitor with good high frequency characteristics such as tantalum capacitor.
Choose such an inductor that a sufficiently small d.c. resistance and large allowable current, and hardly reaches
magnetic saturation.
Use a diode of a Schottky type with high switching speed, and also take care of the rated current.
Set external components as close as possible to the IC and minimize the current between the components and the
IC. In particular, make minimum connection with the output capacitor.
Make sufficient grounding. A large current flows through GND Pin by switching. When the impedance of the GND
connection is high, the potential within the IC is varied by the switching current. This may result in unstable opera-
tion of the IC.
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| RN5RY301C | VFM STEP-UP DC/DC CONVERTER CONTROLLER |
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