ZL6105ALAF datasheet(30/35 Pages) INTERSIL

30 / 35 page

ZL6105

FN6906.5

December 19, 2013

Upon system start-up, the device with the lowest member

position as selected in ISHARE_CONFIG is defined as the

reference device. The remaining devices are members. The

reference device broadcasts its current over the DDC bus. The

members use the reference current information to trim their

voltages (VMEMBER) to balance the current loading of each device

in the system.

Figure 18 shows that, for load lines with identical slopes, the

member voltage is increased towards the reference voltage

which closes the gap between the inductor currents.

The relation between reference and member current and voltage

is given by Equation 37:

where R is the value of the droop resistance.

The ISHARE_CONFIG command is used to configure the device

for active current sharing. The default setting is a stand-alone

non-current sharing device. A current sharing rail can be part of a

system sequencing group.

For fault configuration, the current share rail is configured in a

quasi-redundant mode. In this mode, when a member device

fails, the remaining members will continue to operate and

attempt to maintain regulation. Of the remaining devices, the

device with the lowest member position will become the

reference. If fault spreading is enabled, the current share rail

failure is not broadcast until the entire current share rail fails.

When Auto Compensation is enabled, only two (2) devices can be

configured for current sharing. With Auto Compensation

disabled, up to eight (8) devices can be configured in a given

current sharing rail.

TABLE 27. CURRENT SHARE POSITION SETTINGS

RCFG2

Ω)

CURRENT SHARE

POSITION

CURRENT SENSE

DCR

12.1

13.3

14.7

16.2

17.8

19.6

42.2

RDS

46.4

51.1

56.2

61.9

68.1

82.5

()

MEMBER

REFERENCE

OUT

MEMBER

−

(EQ. 37)

TABLE 28. CURRENT SHARE PIN-STRAP SETTINGS

CFG0 Pin

NLR

CURRENT SHARE #

OF MEMBERS

CURRENT

SHARING

LOW

1.5%

Disabled

OPEN

Disabled

HIGH

TABLE 29. CURRENT SHARE RESISTOR SETTINGS

RCFG0

Ω)NLR

CURRENT SHARE #

OF MEMBERS

CURRENT

SHARING

Disabled

Enabled

12.1

13.3

14.7

16.2

17.8

19.6

Disabled

21.5

Enabled

23.7

26.1

28.7

31.6

34.8

38.3

42.2

Disabled

46.4

Enabled

51.1

56.2

61.9

68.1

82.5

90.9

1.5%

Disabled

100

Enabled

110

121

133

147

162

178

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