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M62291GP 数据表(PDF) 3 Page - Mitsubishi Electric Semiconductor

部件名 M62291GP
功能描述  5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER
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制造商  MITSUBISHI [Mitsubishi Electric Semiconductor]
网页  http://www.mitsubishichips.com
标志 MITSUBISHI - Mitsubishi Electric Semiconductor

M62291GP 数据表(HTML) 3 Page - Mitsubishi Electric Semiconductor

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1. Application Circuit (5.0V Output DC-DC Converter; M62291GP)
Current Limit Detction:
When the voltage drop between 4pin and 5pin becomes 140mV or more,
Current Limit Detection circuit starts to operate. In the example of application
(fig.1), the current is limited to 1.5A.
2
1
3
4
5
IN
Vcc
CLM
Collector
GND
+
+
M62291
VIN (12V)
VOUT(5.0V,1A)
100µF
100µF
0.09ohm
RCLM
1Kohm
1Kohm
150µH
Fig.1 Example of application circuit of M62270GP
2. THE EXPRESSION OF CIRCUIT CONSTANTS
VF
: Forward voltage drop of an external diode.
Vsat : Output saturation voltage of an external switching transistor.
Io :Set to 1/3 to 1/5 of maximum output current
Choose an external transistor, diode and inductor with peak current rating
greater than "Ipk".
CONSTANTS
TON
TOFF
(TON+TOFF)MAX
TOFF(MIN)
TON(MAX)
L(MIN)
VO+VF
VIN - VCE(sat) - VO
1
fosc - TOFF
Io
( VIN - VCE(sat) - VO ) TON(MAX)
1
fosc
fosc:110KHz(Vcc=5V)
EXPRESSIONS
Ipk
RCLM
( TON + TOFF ) /
TON
TOFF
1 +
(
)
Io +
1
2
Io
0.15
Ipk
VCLM:150mV(Vcc=5V)
M62291GP
MITSUBISHI <Standard Linear IC>
5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER
Jan. 2000
3


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