M62291GP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC
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M62291GP Datasheet PDF : 3 Pages
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MITSUBISHI <Standard Linear IC>
M62291GP
5-PIN SOT-23 5.0V SYSTEM FIXED OUTPUT VOLTAGE DC-DC CONVERTER
1. Application Circuit (5.0V Output DC-DC Converter; M62291GP)
VIN (12V)
RCLM
0.09ohm
+ 100µF
VOUT(5.0V,1A)
+
100µF
3 IN
4
5
Vcc
CLM
1Kohm
M62291 Collector 1
GND
1Kohm
2
150µH
Fig.1 Example of application circuit of M62270GP
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. THE EXPRESSION OF CIRCUIT CONSTANTS
CONSTANTS
TON
TOFF
(TON+TOFF)MAX
TOFF(MIN)
TON(MAX)
L(MIN)
Ipk
RCLM
EXPRESSIONS
VO+VF
VIN - VCE(sat) - VO
1
fosc
fosc:110KHz(Vcc=5V)
( TON + TOFF )
/
( 1+
TON
TOFF
)
1
fosc - TOFF
( VIN - VCE(sat) - VO ) TON(MAX)
∆Io
Io
+
1
2
∆Io
0.15
Ipk
∆VCLM:150mV(Vcc=5V)
• 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".
( 3 /3)
Jan. 2000
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