APA2011 datasheet(18/27 Pages) ANPEC

18 / 27 page

Rev. A.4 - Aug., 2013

www.anpec.com.tw

APA2011/2011A

Shutdown Operation (Cont.)

Over-Current Protection

The APA2011/2011A monitors the output current. When

the current exceeds the current-limit threshold, the

APA2011/2011A turns off the output stage to prevent the

output device from damages in over-current or short-cir-

cuit condition. The IC will turn on the output buffer after

1ms, but if the over-current or short-circuits condition still

remains, it enters the Over-Current protection again. The

situation will circulate until the over-current or short-cir-

cuits has be removed.

Thermal Protection

The over-temperature circuit limits the junction tempera-

ture of the APA2011/2011A. When the junction tempera-

ture exceeds T

J = +150

oC, a thermal sensor turns off the

output buffer, allowing the devices to cool. The thermal

sensor allows the amplifier to start-up after the junction

temperature down about 125 oC. The thermal protection

is designed with a 25 oC hysteresis to lower the average

J during continuous thermal overload conditions, in-

creasing lifetime of the IC.

Function Description (Cont.)

a logic high and logic low level is typically 1.4V. It is best to

switch between the ground and the supply voltage VDD to

provide maximum device performance. By switching the

SD pin to a low level, the amplifier enters a low-consump-

tion- current state, I

DD for APA2011/2011A is in shutdown

mode. On normal operating, APA2011/2011A’s SD pin

should pull to a high level to keep the IC out of the shut-

down mode. The SD pin should be tied to a definite volt-

age to avoid unwanted state changes.

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