D0689 is a switch type integrated power supply thick film block (or component), which mainly performs oscillation, voltage control and current overcurrent protection, etc. It has the characteristics of good voltage regulation performance, few external components and convenient maintenance. The circuit is shown in the figure. Show.
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The switching oscillation time of D0689 is divided into five stages:
1) T2 time: After the power is turned on, the rectified output of 300V DC voltage passes through the switching transformer T101 6 feet - 1 pin - IC15 pin, which is added to the inside of the circuit.
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