ANSELA datasheet(47/222 Pages) MICROCHIP

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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

described

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 +VSEN pin can be

configured by setting the PE1<PUEN> bit. When set,

the +VSEN pin is internally pulled-up to VDD.

A high-impedance pull-down on the -VSEN can be

configured by setting the PE1<PDEN> bit. When set,

the -VSEN 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.

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