IR3092 datasheet(16/37 Pages) IRF

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IR3092

Page 16 of 37

06/25/04

"FAST" VDAC

TO FAULT

2.6V FLOAT VOLTAGE

60K

SHOWN DEFAULT

TO VR10 WITH

VID_SEL GROUNDED

IROSC

DAC BUFFER

4.9V

110K

18uA

1.2V

1.5V

3.4V

0.6V

VID0

VID1

VID2

VID3

VID4

VID_SEL

VID5

VDAC

VOSNS-

H=ATHLON

"SLOW" VDAC

DAC DEFAULTS

TO VR10 WITH

VID_SEL GROUNDED

3.3V

VID INPUT

COMPARATORS

(1 OF 6 SHOWN)

H=HAMMER

VID=11111X FAULT

BLANKING, 3.3us

DIGITAL TO ANALOG

CONVERTER

Figure 7– VID Control Block Diagram

VID = 11111X Fault

VID codes of 111111 and 111110 will set the fault latch and disable the Error Amplifier.

Slew Rate Programming Capacitor CDAC and Resistor RDAC

VDAC sink current ISINK and source current ISOURCE are determined by RROSC, and their value can be found using the

curve in the Typical Operating Characteristics. The slew rate of VDAC down-slope SRDOWN can be programmed by the

external capacitor CDAC as defined in Equation (1) and shown in Figure 6. Resistor RDAC is used to compensate VDAC

circuit and is determined by Equation (2). The slew rate of VDAC up-slope SRUP is proportional to the down-slope slew

rate SRDOWN and is given by Equation (3).

DOWN

SINK

DAC

(1)

DAC

(2)

DAC

SOURCE

(3)

IR3092 Datasheet(PDF) 16 Page - International Rectifier

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