ISL6336D Datasheet, PDF(17/30 Page) Intersil Corporation – VR11.1, 6-Phase PWM Controller with Phase Dropping,Droop Disabled and Load Current Monitoring Features

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ISL6336D Datasheet, PDF (17/30 Pages) Intersil Corporation – VR11.1, 6-Phase PWM Controller with Phase Dropping,Droop Disabled and Load Current Monitoring Features

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ISL6336D

EXTERNAL CIRCUIT ISL6336D INTERNAL CIRCUIT

RC CC COMP

RREF

CREF

DAC

REF

RFB

VDIFF

VCOMP

ERROR AMPLIFIER

VOUT+

VOUT-

VSEN

RGND

DIFFERENTIAL

REMOTE-SENSE

AMPLIFIER

FIGURE 11. OUTPUT VOLTAGE REGULATION LOOP

The ISL6336D incorporates an internal differential remote sense

amplifier in the feedback path. The amplifier removes the

voltage error encountered when measuring the output voltage

relative to the local controller ground reference point, resulting in

a more accurate means of sensing output voltage. Connect the

microprocessor sense pins to the noninverting input, VSEN, and

inverting input, RGND, of the remote-sense amplifier. The

remote-sense output, VDIFF, is connected to the inverting input of

the error amplifier through an external resistor.

A digital-to-analog converter (DAC) generates a reference voltage

based on the state of logic signals at pins VID7 through VID0. The

DAC decodes the eight 6-bit logic signal (VID) into one of the discrete

voltages shown in Table 3. All VID pins have no internal pull-up

current sources before tD3. After tD3, each VID input offers a

minimum 30ÂµA pull-up to an internal 2.5V source for use with open-

drain outputs. The pull-up current diminishes to zero above the logic

threshold to protect voltage-sensitive output devices. External pull-

up resistors can augment the pull-up current sources in case

leakage into the driving device is greater than 30ÂµA.

TABLE 3. VR11 VID 8-BIT

VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0

00000000

00000001

00000010

00000011

00000100

00000101

00000110

00000111

00001000

00001001

VOLTAGE

OFF

1.60000

1.59375

1.58750

1.58125

1.57500

1.56875

1.56250

1.55625

TABLE 3. VR11 VID 8-BIT (Continued)

VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0

00001010

00001011

00001100

00001101

00001110

00001111

00010000

00010001

00010010

00010011

00010100

00010101

00010110

00010111

00011000

00011001

00011010

00011011

00011100

00011101

00011110

00011111

00100000

00100001

00100010

00100011

00100100

00100101

00100110

00100111

00101000

00101001

00101010

00101011

00101100

00101101

00101110

00101111

00110000

00110001

VOLTAGE

1.55000

1.54375

1.53750

1.53125

1.52500

1.51875

1.51250

1.50625

1.50000

1.49375

1.48750

1.48125

1.47500

1.46875

1.46250

1.45625

1.45000

1.44375

1.43750

1.43125

1.42500

1.41875

1.41250

1.40625

1.40000

1.39375

1.38750

1.38125

1.37500

1.36875

1.36250

1.35625

1.35000

1.34375

1.33750

1.33125

1.32500

1.31875

1.31250

1.30625

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FN8320.0

October 6, 2014

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