Toshiba TDP-SW20 Service Manual page 97

D) Over Voltage Limit
Output voltage is detected by winding voltage of B1-B2 (T101). This voltage is same as Vcc of
IC101 (pin 6). If output voltage becomes over voltage condition, pin 8 of IC102 to be pulled up
through zener diode ZD102, then power supply is shut down
5) Rectifier & Output Filter
The cathode voltage of D201 is pulsating. D201 and C208, which smooth out the pulsation to give a
low ripple DC output. L202 and C212 are LC filter, which reduce ripple voltage.
2. Time Sharing Multi-output Control Circuit
This is one of output control method, and 3.4V output is controlled by this method.
Charged primary energy is sent to secondary by transformer T101. Normally, one winding power is
used for one output only. But this circuit is added the switching device (diode and FET) on secondary,
it control switch timing for sharing primary power by MC201.
The voltage of MC201(between pin 7 and pin 8) is pulsating. The diode (in MC201) and C204, which
smooth out the pulsation to give a low ripple DC output. Same as chapter 1-5), L201 and C206 are
LC filter, which reduce ripple voltage.
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