ISL62881 查看數據表（PDF） - Renesas Electronics

零件编号

产品描述 (功能)

生产厂家

ISL62881

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

Renesas Electronics 

ISL62881, ISL62881B

VID6

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

VID5

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

TABLE 1. VID TABLE (Continued)

VID4

0

0

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

VID3

1

1

1

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

0

0

0

0

0

0

0

0

1

1

1

1

1

1

1

1

0

0

0

0

0

0

0

VID2

1

1

1

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

VID1

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

1

0

0

1

VID0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

VO

(V)

0.5375

0.5250

0.5125

0.5000

0.4875

0.4750

0.4625

0.4500

0.4375

0.4250

0.4125

0.4000

0.3875

0.3750

0.3625

0.3500

0.3375

0.3250

0.3125

0.3000

0.2875

0.2750

0.2625

0.2500

0.2375

0.2250

0.2125

0.2000

0.1875

0.1750

0.1625

0.1500

0.1375

0.1250

0.1125

0.1000

0.0875

0.0750

0.0625

0.0500

0.0375

0.0250

FN6924 Rev 3.00

June 16, 2011

VID6

1

1

1

1

1

1

1

1

1

VID5

1

1

1

1

1

1

1

1

1

TABLE 1. VID TABLE (Continued)

VID4

1

1

1

1

1

1

1

1

1

VID3

0

1

1

1

1

1

1

1

1

VID2

1

0

0

0

0

1

1

1

1

VID1

1

0

0

1

1

0

0

1

1

VID0

1

0

1

0

1

0

1

0

1

VO

(V)

0.0125

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

0.0000

RDROOP

FB

VDROOP

IDROOP

VCCSENSE

VR LOCAL VO

“CATCH” RESISTOR

COMP

E/A

 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. The current source

is used for load line implementation, current monitor and

overcurrent protection.

Figure 12 shows the load line implementation. The ISL62881

drives a current source Idroop out of the FB pin, described by

Equation 1.

Idroop

=

2----x----V---C----n-

Ri

(EQ. 1)

When using inductor DCR current sensing, a single NTC element

is used to compensate the positive temperature coefficient of the

copper winding thus sustaining the load line accuracy with

reduced cost.

Idroop flows through resistor Rdroop and creates a voltage drop,

as shown in Equation 2.

Vdroop = Rdroop  Idroop

(EQ. 2)

Page 15 of 35

Share Link: