TB2905HQ Toshiba, TB2905HQ Datasheet - Page 6

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TB2905HQ

Manufacturer Part Number
TB2905HQ
Description
Manufacturer
Toshiba
Datasheet

Specifications of TB2905HQ

No. Of Channels
4
Package
HZIP 25-P-1.00F
Recommended Vcc (v)
13.2
Rl=2 Ohm
80W x 4
Rl=4 Ohm
50W x 4
Rl=8 Ohm
-
Features/built-in Functions
4 BTL channels, standby switch, mute, BiCD process, Class-KB high efficiency
Operating Voltage (v)
9 to 18

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5. Output Clipping Detection Function
If the output waveform is clipped, the clipping detection circuit in the IC activates and turns the Q1 NPN
transistor on.
The microcontroller can use this signal to control the volume and tone control circuits, thus improving
sound quality.
(Example application)
(A) Output AC waveform
(B) Clipping detection circuit
(C) Clipping detection pin
Pin 25 has open-collector output (active low) structure, as shown in Figure 7.
Pin 25 should be left open when this function is not used.
(output of pin 25)
Figure 8 Clipping detection mechanism
Output clipping
detector
GND
5V
AC
DC
DC
Pin 25: Open-collector output (active low)
Q1
(A)
(B)
(C)
25
(Pin 25)
smoothing
6
L.P.F.
circuit
5 V
Clipped level
Clipped level
Volume control circuit
Tone control circuit
t
t
t
TB2905HQ
2005-08-17

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