Datasheet

 2013 Microchip Technology Inc. DS22331A-page 47
MCP19111
6.13 Analog Peripheral Control
The MCP19111 has various analog peripherals. These
peripherals can be configured to allow customizable
operation. Refer to Register 6-14 more information.
6.13.1 DIODE EMULATION MODE
The MCP19111 can operate in either diode emulation
or synchronous rectification mode. When operating in
diode emulation mode, the LDRV signal is terminated
when the voltage across the low-side MOSFET is
approximately 0V. This condition is true when the
inductor current reaches approximately 0A. Both the
HDRV and LDRV signals are low until the beginning of
the next switching cycle. At that time, the HDRV signal
is asserted high, turning on the high-side MOSFET.
When operating in Synchronous Rectification mode,
the LDRV signal is held high until the beginning of the
next switching cycle. At that time, the HDRV signal is
asserted high, turning on the high-side MOSFET.
The PE1<DECON> bit controls the operating mode of
the MCP19111.
6.13.2 HIGH-SIDE DRIVE STRENGTH
The peak source and sink current of the high-side
driver can be configured to either be 1A source/sink or
2A source/sink. The PE1<DVRSTR> bit determines
the high-side drive strength.
6.13.3 MOSFET DRIVER DEAD TIME
As described in Section 6.9 “MOSFET Driver
Programmable Dead Time”, the MOSFET drive dead
time can be adjusted. In order to enable dead time
settings, the proper bypass bits must be cleared.
PE1<HDLYBY> and PE1<LDLYBY> control the delay
circuits. Clearing the respective bits allows the dead
time programmed by the DEADCON register to be
added to the appropriate turn-on edge.
6.13.4 OUTPUT VOLTAGE SENSE
PULL-UP/PULL-DOWN
A high-impedance pull-up on the +V
SEN
pin can be
configured by setting the PE1<PUEN> bit. When set,
the +V
SEN
pin is internally pulled-up to V
DD
.
A high-impedance pull-down on the -V
SEN
can be
configured by setting the PE1<PDEN> bit. When set,
the -V
SEN
pin is internally pulled-down to ground.
6.13.5 OUTPUT UNDER VOLTAGE
ACCELERATOR
The MCP19111 has additional control circuitry to allow
it to respond quickly to an output under voltage
condition. The enabling of this circuitry is handled by
the PE1<UVTEE> bit. When this bit is set, the
MCP19111 will respond to an output under voltage
condition by setting both the HDRV and LDRV signals
low and turning off both the high-side and low-side
MOSFETs.
6.13.6 OUTPUT OVERVOLTAGE
ACCELERATOR
The MCP19111 has additional control circuitry to allow
it to respond quickly to an output over voltage
condition. The enabling of this circuitry is handled by
the PE1<OVTEE> bit. When this bit is set, the
MCP19111 will respond to an output overvoltage
condition by setting both the HDRV and LDRV signals
low and turning off both the high-side and low-side
MOSFETs.