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How to produce an output at specific duty even if it is short-circuited?

Latest Updated:12/01/2011

Question:

It seems that the uPC1100 operates when its timer latch voltage exceeds 2.25 V.
Because the voltage of the triangular wave is 1.45 to 2.05 V, however, it is suspected that the output is in the ON state (DC) and the driver elements such as MOS are damaged at 2.25 V.

What should be done to produce an output at a specific duty factor even if the output is short-circuited?

Answer:

As pointed out, settings must be performed so that the output is not in the DC state.
For this setting, the dead time control pins are used.

The DC state can be avoided if the voltage on the dead time control pins is set to a value lower than the peak of the triangular wave (2.05 V).

Adjust the voltage of the dead time control pins (pins 6 and 11) so that the output is not in the ON state, by referring to Figure 3 Operation Waveform in "5. Block Diagram and Operation Waveform" of the User's Manual (Japanese).
Suitable Products
Power Management Linear