MCP19124 datasheet(41/236 Pages) MICROCHIP

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DS20005619A-page 41

MCP19124/5

6.2

Output Overvoltage Protection

The

MCP19124/5

feature

output

overvoltage

protection. In order to utilize this OV protection circuitry,

the voltage regulation error amplifier (EA2) must be

disabled by setting the EN2DIS bit in the ABECON

feature utilizes a comparator module similar to the

standard PIC comparator module. This is used to

prevent the power system from being damaged when

the load is disconnected. The OVREFCON register

contains the digital value that sets the analog DAC

voltage at the inverting input of the comparator. By

comparing the divided down power train output voltage

connected to the noninverting input (VS) of the

comparator with the OVREF reference voltage, the user

can determine when an overvoltage event has

occurred and can automatically take action.

The OVCON register contains the interrupt flag polarity

and OV enable bits along with the output status bit just

as VINCON does for the input voltage UVLO and

OVLO. When OVEN bit in the OVCON register is set

and an overvoltage occurs, the control logic will

automatically set the secondary gate drive output

(SDRV) high and set the primary gate drive output

(PDRV) low.

Note:

The OVIF interrupt flag bit is set when an

interrupt condition occurs, regardless of

the state of its corresponding enable bit or

the Global Enable bit (GIE) in the INTCON

OVCON: OUTPUT OVERVOLTAGE COMPARATOR CONTROL REGISTER

U-0

R/W-0

R-0

R/W-0

—

OVEN

OVOUT

OVINTP

OVINTN

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 7-4

Unimplemented: Read as ‘0’

bit 3

OVEN: OV Comparator output enable bit

= OV Comparator output is enabled

= OV Comparator output is not enabled

bit 2

OVOUT: Output Overvoltage Status Output bit

= Output Overvoltage has occurred

= No Output Overvoltage has occurred

bit 1

OVINTP: OV Comparator Interrupt on Positive Going Edge Enable bit

= The OVIF interrupt flag will be set upon a positive going edge of the OV

= No OVIF interrupt flag will be set upon a positive going edge of the OV

bit 0

OVINTN: OV Comparator Interrupt on Negative Going Edge Enable bit

= The OVIF interrupt flag will be set upon a negative going edge of the OV

= No OVIF interrupt flag will be set upon a negative going edge of the OV

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