M62281P Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC
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M62281P
MITSUBISHI ELECTRIC
M62281P Datasheet PDF : 9 Pages
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MITSUBISHI SEMICONDUCTOR < STANDERD LINEAR IC >
M62281P/FP
GENERAL PURPOSE CURRENT MODE PWM CONTROL IC
FUNCTION DESCRIPTION AND APPLICATION
(1) EA IN, EA OUT TERMINAL
Circuit for EAOUT terminal is connected to constant current
load(370µA typ.) shown in Fig.1. Output voltage of error
amp. is controlled by the output transistor to provide current-
sense comp. with the controlled voltage.
EA OUT
370µA
To current -sense
comp.
Fig.1 Circuit diagram of EAOUT terminal
Peripheral circuit of Error Amp
Detected voltage devided by R1 and R2 is input to EAIN terminal in such case as fly-back system where
VCC line voltage is proportional to output voltage, or in the case that the voltage detection is made on the
primary side. In this case operating region is set by R1 and R2, and AC gain by R1// R2, RF.
From detecting voltage
Reference voltage(2.5V)
R1
EA IN
EA
R2
OUT
RF
Fig.2 Method to detect the voltage on the primary side
In the case that feedforward system by photo-coupler is applied, following two methods are available.
One is the method by error amp. as in Fig.3-1, the other is by the direct connection to photo-coupler as in
Fig.3-2.
When photo-coupler is directly connected to EAOUT terminal, input terminal of error amp. is connected to
GND, photo-coupler is connected directly to EAOUT terminal.
Vcc
R1
Reference voltage(2.5V)
RIN
EA IN
R2
RF
EA
OUT
Reference voltage(2.5V)
EA IN
EAOUT
Fig.3-1 Method to use photo-coupler (1)
Fig.3-2 Method to use photo-coupler (2)
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