TB2926HQ Toshiba, TB2926HQ Datasheet - Page 6

• Manufacturer Part Number: TB2926HQ
• Manufacturer: Toshiba

Specifications of TB2926HQ

• No. Of Channels: 4
• Package: HZIP 25-P-1.00F
• Recommended Vcc (v): 13.2
• Rl=2 Ohm: Not Supported
• Rl=4 Ohm: 43W x 4
• Rl=8 Ohm: -
• Features/built-in Functions: 4 BTL channels, standby switch, mute, low-RON BiCD process, DC offset detection
• Operating Voltage (v): 9 to 18

4. Layer Short Detection
The TB2926HQ may be properly connected to a load such as a 4-Ω speaker, but one of the speaker lines may
be shorted to ground through a low-impedance path. The TB2926HQ can detect such a condition.
As is the case with output DC offset detection, pin 25 is also activated when there is a short on one of the
speaker lines as shown above. The detection impedance is 4.5 Ω (typ.).
This feature allows detection of a short-circuit through a low-impedance path other than the speaker
impedance. It helps to avoid speaker damage in case of anomalous system conditions and improve system
reliability.
Note 3: The detection impedance varies with temperature, as shown above. Experiment with actual hardware.
Figure 7 Typical Detection Impedance vs Junction Temperature (Intended as a Guide)
12
10
8
6
4
2
0
-50
Detection impedance vs junction temperature
The negative ( − ) speaker connection is shorted to ground
through a low-impedance path due to some irregularities.
0
IC
50
Figure 6 Layer Short
V
CC
Tj (℃)
GND
100
6
out
out
150
SP = 4 Ω
200
Test conditions
Vcc = 13.2 V
Internal resistor
= 200 Ω
5 V-10 kΩ
Pull-up
TB2926HQ
2006-11-27