MCP19111 datasheet(49/226 Pages) MICROCHIP

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DS20002331B-page 49

MCP19110/11

6.13

Analog Peripheral Control

The MCP19110/11 has various analog peripherals.

These peripherals can be configured to allow custom-

izable operation. Refer to Register 6-14 more informa-

tion.

6.13.1

DIODE EMULATION MODE

The MCP19110/11 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 MCP19110/11.

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 UNDERVOLTAGE

ACCELERATOR

The MCP19110/11 has additional control circuitry to

allow it to respond quickly to an output undervoltage

condition. The enabling of this circuitry is handled by

the PE1<UVTEE> bit. When this bit is set, the

MCP19110/11 will respond to an output undervoltage

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 MCP19110/11 has additional control circuitry to

allow it to respond quickly to an output overvoltage

condition. The enabling of this circuitry is handled by

the PE1<OVTEE> bit. When this bit is set, the

MCP19110/11 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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