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參數(shù)資料
| 型號(hào)： | M62221L |
| 廠商： | Mitsubishi Electric Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 3.0V FIXED OUTPUT VOLTAGE DC-DC CONVERTER |
| 中文描述： | 3.0V固定輸出電壓的DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 3/3頁 |
| 文件大?。?/td> | 25K |
| 代理商： | M62221L |
MITSUBISHI <Dig./Ana. INTERFACE>
M62221L/FP
3.0V FIXED OUTPUT VOLTAGE DC-DC CONVERTER
April. 1997
( 3 / 3 )
Application Circuit (3.0V Output DC-DC Converter)
Current Limit Detection:
When the voltage drop between pin 3 and pin 4 becomes more than 150mV,
the Current Limit Detection circuit begins operating. The peak switch
current "Ipk" is limited to 150mV / R
CLM
. In the example of application
(fig.1), the current is limited to 1.5A.
2
1
3
4
Vcc
5 IN
CLM
Collector
GND
+
+
M62221
V
IN
(5V)
V
OUT
(3.0V,1A)
100μF
100μF
0.1
R
CLM
1K
1K
68μH
Fig.1 Example of the M62221L/FP application circuit
THE EXPRESSION OF CIRCUIT CONSTANTS
VF :Forward voltage drop of an external diode.
Vsat :Output saturation voltage of an external switching transistor.
I
O
:It should be set between 1/3 and 1/5 of maximum output current.
An external transistor, diode and inductor should have a peak current capability of
greater than "Ipk".
CONSTANTS
T
ON
T
OFF
(T
ON
+T
OFF
)
MAX
T
OFF(MIN)
T
ON(MAX)
L
(MIN)
V
O
+V
F
V
IN
- V
CE(sat)
- V
O
1
fosc- T
OFF
I
o
2
Io
( V
IN
- V
CE(sat)
- V
O
) x T
ON(MAX)
1
fosc
fosc:110KHz(Vcc=5V)
EXPRESSIONS
Ipk
R
CLM
( T
ON
+ T
OFF
) /
T
ON
T
OFF
1 +
(
)
Io +1
0.15
Ipk
V
CLM
:150mV(Vcc=5V)
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