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MT700 Service Manual

4.1.5.4. Voltage Feedback

The seconddary referenced error amplifier control system is implemented with the

TL431. The device consists if an accurate 2.5V reference, error amplifer a, and

driver. The output voltage is sensed , diveded by R5 and R6 ,and applied to the

inverting of the error amplifier is internally connected to the reference voltage . The

frequency response of the error amplifier is determinde by the compensation network

cinsisting of R3 an C1, and the high frequency gain setting R4. The optocouple diode

current is limited by R7. the optocoupler drives the error signal into the feedback pin

of PWM IC.