ISL6557A データシートの表示（PDF） - Intersil

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ISL6557A

Multi-Phase PWM Controller for Core-Voltage Regulation

Intersil 

ISL6557A

To enable the controller, VCC must be greater than the POR

threshold; the voltage on EN must be greater than 1.23V and

VID cannot be equal to 11111. Once these conditions are

true, the controller immediately initiates a soft start

sequence.

SOFT-START

The soft-start time, tSS, is determined by an 11-bit counter

that increments with every pulse of the phase clock. For

example, a converter switching at 250kHz has a soft-start

time of

TSS

=

2----0---4----8-

fSW

=

8.2 m s

(EQ. 5)

11

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