ISL6557ACB-T datasheet(11/19 Pages) INTERSIL

Part #	ISL6557ACB-T

Description	Multi-Phase PWM Controller for Core-Voltage Regulation

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Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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11 / 19 page

11

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

T

SS

2048

f

SW

-------------

8.2ms

==

(EQ. 5)

ISL6557A

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