TB2912HQ Toshiba, TB2912HQ Datasheet - Page 15

• Manufacturer Part Number: TB2912HQ
• Manufacturer: Toshiba

Specifications of TB2912HQ

• No. Of Channels: 4
• Package: HZIP 25-P-1.00F
• Recommended Vcc (v): 13.2
• Rl=2 Ohm: 70W x 4
• Rl=4 Ohm: 43W x 4
• Rl=8 Ohm: -
• Features/built-in Functions: 4 BTL channels, standby switch, mute, BiCD process, I2C self-diagnosis, tweeter diagnostics, low standby current
• Operating Voltage (v): 9 to 18

Mute
Mute ON
Output
Play
- Need to input the pulse or signal which is the higher out of audience frequency for example f =
- The pulse or signal input timing has to be after mute off (play mode)
- At least, the read timing has to be after 1 cycle of input pulse or signal and more, the
- The level of input pulse or signal is more than the detection threshold level 300 mA or 500 mA.
This warning bit becomes high, about 10 degrees below the temperature at which the
overtemperature protection operates.
Note 7: Timing charts may have been simplified for ease of reading.
Note 8: Please arrange to read all self-diagnosis functions twice or more and apply judgment in order to
When the current detector for Tweeter open check is used, it is neccesary to take care as below:
20 kHz
recommadation cycles are 3 cycle and more if can.
For instance, if the tweeter impedance is 20 Ω at f = 20 kHz which is same as input signal frequency,
the output minimum voltage is: Vout = 500 mA × 20 Ω = 10 V and more.
Finally, if DB1 D7 = 1 then the temperature of IC chip is close to the thermal shutdown point.
WRITE DATA
stand by off
mute on
READ DATA
avoid false triggering.
<Since the first diagnostic result has low confidence, please diagnose 2 times or more.>
invalidity
Figure 10 Tweeter Open Detection Timing Chart
Current detector is not effective
WRITE DATA
READ DATA
invalidity
mute off
15
READ DATA
invalidity
READ DATA
Effective →
validity
READ DATA
validity
TB2912HQ
2006-04-28