Daewoo DWP-28W2ZZF Service Manual download pdf (Page 63)

Appendix Service manual WP-795

- 36 -

When the MOSFET is ON, the STR-F6653 internal capacitor C1 is charged at the constant voltage

6.5V.

At the same time, the voltage at pin 1 (OCP / FB) increases with the same waveform as the MOSFET

drain current.

When the pin 1 voltage reaches the threshold voltage V

TH1

= 0.73V, the STR-F6653 internal

comparator 1 starts operating. The STR-F6653 internal oscillator is inverted and the MOSFET turns OFF.

When the MOSFET turns OFF, charging of STR-F6653 internal capacitor C1 is released and C1

starts discharging by the STR-F6653 internal resistance R1. So, C1 voltage starts falling in accordance

with the gradient regulated by the constant discharging time of C1 and R1. So, this means that the fixed

time determined by C1 and R1 is the OFF-time of the MOSFET.

When C1 voltage falls to around 3.7V, the STR-F6653 internal oscillator is reversed again and the

MOSFET turns ON. C1 is quickly charged to around 6.5V

The MOSFET continues to oscillate by repeating the above procedure.

2-8 -2-3 STR-F6653 protection circuits

• overcurrent protection function (OCP)

Overcurrent protection is performed pulse by pulse detecting at STR-F6653 pin 1 (OCP) the peak of the

MOSFET drain current in every pulse.

•

latch circuit

This circuit sustains an output low from the STR-F6653 internal oscillator and stops operation of the

power supply when overvoltage protection (OVP) and thermal shutdown (TSD) circuit are under

operation

•

thermal shutdown circuit (TSD)

This circuit triggers the latch circuit when the frame temperature of STR-F6653 IC exceeds 140

•

overvoltage protection circuit (OVP)

This circuit triggers the latch circuit when the V

voltage exceeds 22V (typ.)

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Daewoo DWP-28W2ZZF Service Manual Page 63