MCP19124 datasheet(21/236 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005619A-page 21

MCP19124/5

3.10

OV REF

This reference is dual purposed and can be used to set

the voltage regulation set point or the output

overvoltage set point. By default this reference is

connected to the noninverting input of the voltage error

amplifier (EA2). When the voltage error amplifier is

disabled by setting the EA2DIS bit in the ABECON

input of the over voltage comparator. Here this

reference is compared to the VS input pin, which is

typically proportional to the output voltage based on an

external resistor divider. OV protection, when enabled,

can be set to a value for the protection of system

circuitry or it can be used to “ripple” regulate the

converter output voltage for repositioning purposes.

The comparator output triggers a configurable interrupt

such that firmware can take any additional desired

action.

3.11

Independent Gate Drive with

Programmable Delay

Two independent low-side gate drives are integrated

for synchronous applications. Programmable delay has

been implemented to improve efficiency and prevent

shoot-through currents. Each gate drive has an

independent enable input controlled by the PE1

DEADCON register.

3.12

Temperature Management

3.12.1

THERMAL SHUTDOWN

To protect the MCP19124/5 from overtemperature

conditions, a 150°C junction temperature thermal

shutdown has been implemented. When the junction

temperature reaches this limit, the device disables the

output drivers. In Shutdown mode, both PDRV and

SDRV outputs are disabled and the overtemperature

flag (OTIF) is set in the PIR2 register. When the

junction temperature is reduced by 20°C to 130°C, the

MCP19124/5 can resume normal output drive

switching.

3.12.2

TEMPERATURE REPORTING

The MCP19124/5 have a second on-chip temperature

monitoring circuit that can be read by the ADC through

the analog test MUX. Refer to Section 25.0 “Internal

Temperature Indicator Module” for details on this

internal temperature monitoring circuit.

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