ISL62881 Просмотр технического описания (PDF) - Intersil

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Компоненты Описание

производитель

ISL62881

Single-Phase PWM Regulator for IMVP-6.5™ Mobile CPUs and GPUs

Intersil 

ISL62881, ISL62881B

TABLE 1. VID TABLE (Continued)

VO

VID6 VID5 VID4 VID3 VID2 VID1 VID0 (V)

1

0

0

0

0

1

1 0.6625

1

0

0

0

1

0

0 0.6500

1

0

0

0

1

0

1 0.6375

1

0

0

0

1

1

0 0.6250

1

0

0

0

1

1

1 0.6125

1

0

0

1

0

0

0 0.6000

1

0

0

1

0

0

1 0.5875

1

0

0

1

0

1

0 0.5750

1

0

0

1

0

1

1 0.5625

1

0

0

1

1

0

0 0.5500

1

0

0

1

1

0

1 0.5375

1

0

0

1

1

1

0 0.5250

1

0

0

1

1

1

1 0.5125

1

0

1

0

0

0

0 0.5000

1

0

1

0

0

0

1 0.4875

1

0

1

0

0

1

0 0.4750

1

0

1

0

0

1

1 0.4625

1

0

1

0

1

0

0 0.4500

1

0

1

0

1

0

1 0.4375

1

0

1

0

1

1

0 0.4250

1

0

1

0

1

1

1 0.4125

1

0

1

1

0

0

0 0.4000

1

0

1

1

0

0

1 0.3875

1

0

1

1

0

1

0 0.3750

1

0

1

1

0

1

1 0.3625

1

0

1

1

1

0

0 0.3500

1

0

1

1

1

0

1 0.3375

1

0

1

1

1

1

0 0.3250

1

0

1

1

1

1

1 0.3125

1

1

0

0

0

0

0 0.3000

1

1

0

0

0

0

1 0.2875

1

1

0

0

0

1

0 0.2750

1

1

0

0

0

1

1 0.2625

1

1

0

0

1

0

0 0.2500

1

1

0

0

1

0

1 0.2375

1

1

0

0

1

1

0 0.2250

1

1

0

0

1

1

1 0.2125

1

1

0

1

0

0

0 0.2000

1

1

0

1

0

0

1 0.1875

1

1

0

1

0

1

0 0.1750

TABLE 1. VID TABLE (Continued)

VO

VID6 VID5 VID4 VID3 VID2 VID1 VID0 (V)

1

1

0

1

0

1

1 0.1625

1

1

0

1

1

0

0 0.1500

1

1

0

1

1

0

1 0.1375

1

1

0

1

1

1

0 0.1250

1

1

0

1

1

1

1 0.1125

1

1

1

0

0

0

0 0.1000

1

1

1

0

0

0

1 0.0875

1

1

1

0

0

1

0 0.0750

1

1

1

0

0

1

1 0.0625

1

1

1

0

1

0

0 0.0500

1

1

1

0

1

0

1 0.0375

1

1

1

0

1

1

0 0.0250

1

1

1

0

1

1

1 0.0125

1

1

1

1

0

0

0 0.0000

1

1

1

1

0

0

1 0.0000

1

1

1

1

0

1

0 0.0000

1

1

1

1

0

1

1 0.0000

1

1

1

1

1

0

0 0.0000

1

1

1

1

1

0

1 0.0000

1

1

1

1

1

1

0 0.0000

1

1

1

1

1

1

1 0.0000

RDROOP

FB

VDROOP

IDROOP

VCCSENSE

VR LOCAL VO

“CATCH”

RESISTOR

COMP

E/A

Σ

DAC

VDAC

INTERNAL TO IC

X1

VIDS

RTN

VSS

VID<0:6>

VSSSENSE

“CATCH”

RESISTOR

FIGURE 12. DIFFERENTIAL SENSING AND LOAD LINE

IMPLEMENTATION

As the load current increases from zero, the output

voltage will droop from the VID table value by an amount

proportional to the load current to achieve the load line.

The ISL62881 can sense the inductor current through the

intrinsic DC Resistance (DCR) resistance of the inductors

as shown in Figure 1 or through resistors in series with

the inductors as shown in Figure 2. In both methods,

capacitor Cn voltage represents the inductor total

currents. A droop amplifier converts Cn voltage into an

internal current source with the gain set by resistor Ri.

14

FN6924.1

February 25, 2010

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