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參數(shù)資料
| 型號： | RN5RY331A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A SWITCHING CONTROLLER, 180 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | MINI, PLASTIC, SOT-23, 5 PIN |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 434K |
| 代理商： | RN5RY331A-TR |
RN5RYxx1
12
APPLICATION HINTS
L1
D1
VOUT
CE
GND
VOUT
VIN
+
C2
+
C1
+
C3
Cb
Rb
Q1
EXT
RN5RYxx1
TYPICAL APPLICATIONS
Components : Inductor (L1)
: CD105
Diode (D1)
: D1FS4A (Schottky Type)
Capacitor (C1)
: 33F (Tantalum Type)
Capacitor (C2)
: 47F (Tantalum Type)
Capacitor (C3)
: 47F (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 (VDS, VCF). 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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