MCP19116 datasheet(48/246 Pages) MICROCHIP

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MCP19116/7

DS20005479B-page 48

 2015-2016 Microchip Technology Inc.

6.8

Output Regulation Reference

Voltage Configuration

The VREFCON register controls the error amplifier

reference voltage. This reference is used to set the

current or voltage regulation set point. VREFCON

holds the digital value used by an 8-bit linear DAC,

setting the analog equivalent that gets summed with

the pedestal voltage (VZC) at the non-inverting node of

the error amplifier. VZC is equal to the band gap

voltage (1.23V). The output of the current sense

amplifier A2 is also raised on the pedestal voltage,

effectively canceling its effect on the input. The

pedestal is implemented throughout the analog control

loop to improve accuracy at low levels. The VREF DAC

can be adjusted in 255 steps of 4.8 mV/step.

bit 3-0

SDRVDT<3:0>: SDRV Dead Time Configuration bits (tTD_2)

0000 = 16 ns delay

0001 = 32 ns delay

0010 = 48 ns delay

0011 = 64 ns delay

0100 = 80 ns delay

0101 = 96 ns delay

0110 = 112 ns delay

0111 = 128 ns delay

1000 = 144 ns delay

1001 = 160 ns delay

1010 = 176 ns delay

1011 = 192 ns delay

1100 = 208 ns delay

1101 = 224 ns delay

1110 = 240 ns delay

1111 = 256 ns delay

DEADCON: DRIVER DEAD TIME CONTROL REGISTER (CONTINUED)

VREFCON: CURRENT/VOLTAGE REGULATION SET POINT CONTROL

R/W-0

VREF7

VREF6

VREF5

VREF4

VREF3

VREF2

VREF1

VREF0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = Bit is unchanged

x = Bit is unknown

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7-0

VREF<7:0>: Voltage-Controlling Current Regulation Set Point bits

VREF(V) =VBG * N/255 where N is the decimal value written to the VREFCON Register

<VREF7:VREF0> from 0 to 255

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