M62294FP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC
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M62294FP Datasheet PDF : 4 Pages
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MITSUBISHI(Standard Linear ICs)
M62294FP
3.3V, 2.0V FIXED 2-OUTPUT VOLTAGE DC-DC CONVERTER
APPLICATION CIRCUIT (3.3V and 2.0V 2-output voltage DC-DC converter
VIN(5V)
+
Cin
VOUT1(3.3V)
+
Co1
VOUT2(2.0V)
+
Co2
Vcc
IN1
Cout1
M62294FP
IN2
RESET Cd
Cout2
GND
R2
Q1
R1
L1
D1
R4
Q2
R3
L2
D2
2.0V LINE
3.3V LINE
MCU etc.
THE EXPRESSION OF CIRCUIT CONSTANTS
Constants
T ON
T OFF
(T ON+T OFF)MAX
T OFF(MIN)
T ON(MAX)
L(MIN)
Ipk
Expressions
VO+VF
VIN - VCE(sat) - VO
1
fosc fosc:110KHz(Vcc=5V)
( TON + T OFF )
/ ( 1+
T ON
T OFF
)
1
fosc
-
TOFF
( VIN - VCE(sat) - VO ) X T ON(MAX)
∆Io
Io +
1 ∆Io
2
note:
·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
approximately greater than "Ipk".
( 4 /4)
000131
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