AN2487

Electrical characteristics

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The graphs above were run out to 0.8 A to show that loading can be traded off between the

two outputs with very little effect on output voltage. Note, however, that at very light loads the

cross regulation suffers. If light load operation is required, pre-loads may be necessary.

4.7.3

Startup and shutdown

●

Channel 1 = 12 V output

●

Channel 2 = 3.3 V output

A slight voltage overshoot is visible as the control loop comes into play. This was not

regarded as serious enough to require correction.

Figure 22.

57 V shutdown full load

●

Channel 1 = 12 V output

●

Channel 2 = 3.3 V output

Figure 20.

42 V full load startup

Figure 21.

57 V full load startup