IR3082

Page 12 of 12

12/17/04

VID4 VID3 VID2 VID1 VID0

Vout (V)

0

0

0

0

0

1.550

0

0

0

0

1

1.525

0

0

0

1

0

1.500

0

0

0

1

1

1.475

0

0

1

0

0

1.450

0

0

1

0

1

1.425

0

0

1

1

0

1.400

0

0

1

1

1

1.375

0

1

0

0

0

1.350

0

1

0

0

1

1.325

0

1

0

1

0

1.300

0

1

0

1

1

1.275

0

1

1

0

0

1.250

0

1

1

0

1

1.225

0

1

1

1

0

1.200

0

1

1

1

1

1.175

1

0

0

0

0

1.150

1

0

0

0

1

1.125

1

0

0

1

0

1.100

1

0

0

1

1

1.075

1

0

1

0

0

1.050

1

0

1

0

1

1.025

1

0

1

1

0

1.000

1

0

1

1

1

0.975

1

1

0

0

0

0.950

1

1

0

0

1

0.925

1

1

0

1

0

0.900

1

1

0

1

1

0.875

1

1

1

0

0

0.850

1

1

1

0

1

0.825

1

1

1

1

0

0.800

1

1

1

1

1

OFF

4

Note: 4 Output disabled (Fault mode)

Table 1 – VID Table

Adaptive Voltage Positioning

Adaptive voltage positioning is needed to reduce the output voltage deviations during load transients and the power

dissipation of the load when it is drawing maximum current. The circuitry related to voltage positioning is shown in

voltage. An internal current source whose value is programmed by the same external resistor that programs the

oscillator frequency pumps current into the FB pin. The error amp forces the converter’s output voltage lower to

DAC voltage.