TB2939HQ Ver la hoja de datos (PDF) - Toshiba

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Fabricante

TB2939HQ

45W ×4-ch BTL Audio Power IC

Toshiba 

TB2939HQ

3.3 DC Offset Detection

The purpose of the integrated DC offset detector is to avoid an anomalous DC offset on the outputs,

produced by the input capacitor due to leakage current or short-circuit.

Vref

Elec. vol

Leakage current

or short-circuit

RS1

Vref/2

Vbias

V

+

5V

−

25

LPF

A

Positive DC offset (+)

(caused by RS1)

VCC/2 (normal DC voltage)

Negative DC offset (−)

(caused by RS2)

To a microcontroller

B The microcontroller shuts down the

system if the output is lower than

the specified voltage.

Figure 7 DC Offset Detection Mechanism

Amp output

GND

Voltage at (A)

(pin 25)

GND

Voltage at (B)

(LPF output)

GND

OUT(-)

VCC/2

Offset detection

threshold voltage

OUT(+)

Time

Time

Time

6

Rev-1.0 2009-01-21

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