M62290L 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC
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M62290L Datasheet PDF : 7 Pages
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MITSUBISHI <Dig./Ana. INTERFACE>
M62290L/FP
5.0V FIXED OUTPUT VOLTAGE DC-DC CONVERTER
Application Circuit (5V Output DC-DC converter)
VIN (12V)
RCLM
0.09Ω
+ 100µ F
VOUT(5.0V,1A)
5 IN
+
100µ F
4
3
Vcc
CLM
M62290 Collector 1
GND
2
1KΩ
1KΩ
150µ H
Fig.1 Example of application circuit of the M62290L/FP
•Current Limit Detection:
When the voltage drop between pin 3 and 4 becomes more than 140mV,
the Current Limit Detection circuit begins operating. The peak switch
current "Ipk" is limited to 140mV / RCLM. In the example of application
(fig.1), the current is limited to 1.5A.
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:120KHz(Vcc=12V)
( TON + TOFF ) / ( 1 + TON )
TOFF
1
fosc - TOFF
( VIN - VCE(sat) - VO ) X TON(MAX)
∆Io
Io +
1
2
∆Io
0.14
Ipk
∆VCLM:140mV(Vcc=12V)
• VF : Forward voltage drop of an external diode.
• Vsat : Output saturation voltage of an external switching transistor.
• ∆IO : Set between 1/3 and 1/5 of the maximum output current.
• An external transistor, diode and inductor must be have a peak current capability of
approximately greater than "Ipk".
(6 / 7 )
April 1997
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