Application Notes

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Notes

1. Output pre-bias holdoff has now been incorporated into

the W-suffix modules (PTH12000W), with a production

lot date code of “0423” or later.

2. To further ensure that the regulator’s output does not sink

current when power is first applied (even with a ground

signal applied to the Inhibit control pin), the input voltage

must always be greater than the applied pre-bias source.

This condition must exist throughout the power-up

sequence of the power system.

Figure 3–5; Pre-Bias Startup Waveforms

Vo (1 V/Div)

1

Vo (1 V/Div)

2

Io (2 A/Div)

2

HORIZ SCALE: 5 ms/Div

Hold-off

Period

PTH12000 Series