APFCON datasheet(39/222 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

DS22331A-page 39

MCP19111

6.4

Current Sense DC Gain

DC gain can be added to the sensed inductor current to

allow it to be read by the ADC. The amount of DC gain

added is controlled by the CSDGCON register.

Adding DC gain to the current sense signal used by the

control loop may also be needed in some multi-phase

systems to account for device and component

differences. The CSDGEN bit determines if the gained

current sense signal is added back to the AC current

signal (see Register 6-4). If the CSDGEN bit is cleared,

DC gain can still be added, but the gained signal is not

added back to the AC current signal.

CSDGCON: CURRENT SENSE DC GAIN CONTROL REGISTER

R/W-0

U-0

R/W-x

CSDGEN

—

Reserved

CSDG2

CSDG1

CSDG0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

CSDGEN: Current Sense DC Gain Enable bit

= DC gain current sense signal used in control loop.

= DC gain current sense signal only read by ADC.

bit 6-4

Unimplemented: Read as ‘0’

bit 3

Reserved

bit 2-0

CSDG<2:0>: Current Sense DC Gain Setting bits

000

= 19.5 dB

001

= 21.8 dB

010

= 24.1 dB

011

= 26.3 dB

100

= 28.6 dB

101

= 30.9 dB

110

= 33.2 dB

111

= 35.7 dB

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