TB2905HQ Просмотр технического описания (PDF) - Toshiba

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TB2905HQ

Class KB High-Efficiency, Low-Frequency Power Amplifier IC Maximum Power: 47 W × 4 Channels

Toshiba 

TB2905HQ

4. Offset Detection Function

Pin 25 can be used to detect an offset voltage that may appear on an output pin due to input capacitor

leakage or other reasons.

V

Output DC voltage (+) (for RS1)

Capacitor leakage

Vref

or short-circuit

RS1

Electrical

volume

Vref/2

Vbias

VCC/2 (normal DC voltage)

+

−

25

Output DC voltage (−) (for RS2)

Output offset voltage

(upon input capacitor leakage or short-circuit)

5V

L.P.F.

smoothing

To microcontroller The

A

circuit

B

microcontroller shuts down the

system if the output is lower than

the specified voltage.

Figure 6 Example application and detection mechanism

Output DC

voltage (+)

GND

Voltage at point A

(output of pin 25)

GND

Voltage at point B

(LPF output)

GND

Offset detection threshold

(RS1 detection)

VCC/2

(normal DC voltage)

Offset detection threshold

(RS2 detection)

Time

Time

RS2

Time

5

2005-08-17

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