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MCP19124 Datasheet(PDF) 42 Page - Microchip Technology

Part # MCP19124
Description  Digitally-Enhanced Power Analog Synchronous Low-Side Dual-Loop PWM Controller
PDF  236 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP19124 Datasheet(HTML) 42 Page - Microchip Technology

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MCP19124/5
DS20005619A-page 42
 2016 Microchip Technology Inc.
6.3
Voltage Regulation Configuration
The OVREFCON register controls the voltage error
amplifier (EA2) reference voltage. This reference is
used to set the voltage regulation set point.
OVREFCON holds the digital value used by an 8-bit
linear DAC setting the analog equivalent that is
connected to the noninverting node of the voltage error
amplifier (EA2). This gets compared to the voltage at
the EA2 inverting input which is the feedback voltage
connected to the VS pin. The OVREF DAC can be
adjusted in 255 steps of 9.6 mV/step or approximately
0V to 2.46V. However, it should be noted that while in
voltage regulation, the error amplifier (EA2) low end of
the common mode voltage input range is 0.8V. To
maintain accurate voltage regulation, scale the EA2
inputs between 0.8V and 2.46V. The output voltage
feedback must be divided down inside of this voltage
range before connecting to the VS pin. Whichever error
amplifier (EA1 or EA2) has the lower output signal,
takes control of the PWM control loop.
REGISTER 6-5:
OVREFCON: VOLTAGE REGULATION AND OUTPUT OVERVOLTAGE DETECT
LEVEL REGISTER
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
R/W-x
OOV7
OOV6
OOV5
OOV4
OOV3
OOV2
OOV1
OOV0
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
OOV<7:0>: Output Overvoltage Detect Level Configuration bits
VOV_REF(V) = 2 x VBG x N/255 where N = the decimal value written to the OVREFCON Register
OOV<7:0> from 0 to 255.



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