MCP16251 datasheet(13/34 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

DS25173A-page 13

MCP16251/2

4.2.6

INTERNAL COMPENSATION

The error amplifier, with its associated compensation

network,

completes

the

closed-loop

system

comparing the output voltage to a reference at the

input of the error amplifier, and feeding the amplified

and inverted signal to the control input of the inner

current loop. The compensation network provides

phase leads and lags at appropriate frequencies to

cancel excessive phase lags and leads of the power

circuit. All necessary compensation components and

slope compensation are integrated.

4.2.7

SHORT CIRCUIT PROTECTION

Unlike most boost converters, the MCP16251/2 allows

its output to be shorted during normal operation. The

internal current limit and overtemperature protection

limit excessive stress and protect the device during

periods

short

circuit,

overcurrent

and

overtemperature. While operating in Input-to-output

Bypass mode, the P-Channel current limit is inhibited to

minimize quiescent current.

4.2.8

LOW NOISE OPERATION

The MCP16251/2 integrates a low noise anti-ring

switch that damps the oscillations typically observed at

the switch node of a boost converter when operating in

the discontinuous inductor current mode. This removes

the high frequency radiated noise.

4.2.9

OVERTEMPERATURE

PROTECTION

Overtemperature protection circuitry is integrated in the

MCP16251/2 devices. This circuitry monitors the

device junction temperature and shuts the output off if

the junction temperature exceeds the typical +160oC. If

this threshold is exceeded, the device will automatically

restart once the junction temperature drops by 20oC.

During the thermal shutdown, the device is periodically

looking for temperature; once the temperature of the

die drops, the device restarts. Because the device

takes its bias from the output (to achieve lower IQ cur-

rent) while in thermal shutdown state, there is no low

reference band gap and the output may be higher than

zero for inputs below 1.4V typical. The soft start is reset

during an overtemperature condition.

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