STLC60133

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The bias level is programmed by the TTL logic level applied to the PWDN pins. The DGND pin is the logic

ground reference for the PWDN pins. For normal operation the BIAS pin shall be left open.

The BIAS control pin can be used to adjust the internal biasing and thus the quiescent current. By pulling out a

current of 0

µA to 200µA, the quiescent current can be adjusted from 100% (full ON) to a full OFF condition.

However, considering the internal parameter spread to full shutdown the STLC60133 is recommended to pull

down a 250

µA current from the BIAS pin. In the following figure is shown an implementation of a complete am-

plifier shutdown. To partially reduce the internal biasing also the PWDN pins can be used.

Figure 2. Logic drive of bias pin for complete Amplifier Shutdown.

THERMAL SHUTDOWN

A thermal protection is embedded in the STLC60133. In case of thermal overload the device is shut down at

160°C and returns to normal operation when the temperature becomes lower than 145°C.

During the thermal shutdown the voltage at the BIAS pin goes to the DGND rail; when the device returns to the

normal operation the voltage at the BIAS pin goes to the positive rail. In this condition the BIAS pin can be used

as thermal overload indicator.

MAXIMUM POWER DISSIPATION

tance Junction to ambient of 29°C/W can be obtained mounting the device on a 4 layer board whithin 10 square

inches of copper and having the exposed pad contacting a proper copper area . It shall be noted that the ex-

Figure 3. Shutdown and alarm circuit

3.3V

BIAS

50K

Ω

R1

D01TL492

R1 = 47K

Ω for ± 12V

R1 = 22K

Ω for ± 6V

R2

STLC60133

+5V

ALARM

OR

BIAS

BIAS

BIAS

BIAS

OR

0-200

µA

10K

Ω

PWDN0

PWDN1

1/4 HCF40109B

ST

SHUT

DOWN

200

µA

10K

Ω

1M

Ω

10K

Ω

100K

Ω

ALARM

D01TL491

MIN

β 350

+5V

STLC60133