RM6203 데이터 시트보기 (PDF) - Unspecified
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RM6203 Datasheet PDF : 7 Pages
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open current will increase along with IS linearly, when IS raises
to 0.6V, the OB open current is approximately 100mA, this
feature will effectively utilize the output current of OB and lower
the power consumption of RM6203), if IS detects the specified
current of FB, it goes into close period; in the close period, OB
pulls down, the power tube may not be turned off immediately,
but OE clamps on 2.0V (after the power tube turns off, the
base will be reverse bias and the voltage withstanding
capacity is increased); in the open or close period, if it detects
the current exceeding upper limit of the power tube, then the
upper limit flip-flop will be put at the preferential position,
forcing FB to decrease and the duty ratio will turn smaller, so
that the power tube and transformer will be protected; at the
RM6203
beginning of next close period edge or if FB is below 1.8V, the
upper limit flip-flop will reset. Besides, the built-in heat
protection of RM6203 will widen the oscillator period when the
internal temperature is above 125 ℃ to ensure the
temperature of RM6203 will not exceed 135℃; the built-in
slope compensation will stabilize the open/close period when
RM6203 is at high duty ratio or in continuous current mode.
When VCC lowers to about 4.4V, the oscillator will be
closed, OSC1 and OSC2 will be at low level, and the power
source will be maintained at close period; when VCC goes on
lowering to about 3.8V, RM6203 will enter the enabling stage
again.
Normal Stage Switching Cycle Oscillogram
Global Oscillogram
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