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TB2946HQ
TOSHIBA Bi-CMOS Linear Integrated Circuit Silicon Monolithic
TB2946HQ
49 W × 4-ch BTL Audio Power IC
The TB2946HQ is a four-channel BTL power amplifier for car audio applications. This IC has a pure complementary P-ch and N-ch DMOS output stage, offering maximum output power (POUT MAX) of 49 W. It includes a standby switch, mute function and various protection features.
Features
• High output power • • • • • • • • • • • • POUT MAX (1) = 49 W (typ.) (VCC = 15.2 V, f = 1 kHz, JEITA max, RL = 4 Ω) POUT MAX (2) = 43 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω) : POUT MAX (3) = 70 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 2 Ω) POUT (1) = 26 W (typ.) (VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω) POUT (2) = 23 W (typ.) (VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
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Weight: 7.7 g (typ.)
Low THD: 0.007% (typ.) (VCC = 13.2 V, f = 1 kHz, POUT = 5 W, RL = 4 Ω) Low noise: VNO = 60 μVrms (typ.) (VCC = 13.2 V, Rg = 0 Ω, BW = 20 Hz to 20 kHz, RL = 4 Ω) Standby switch (pin 4) Mute function (pin 22) Output DC offset detection (pin 25) Various protection features Thermal overload; overvoltage; output short-circuits to GND, VCC and across the load; speaker current limiting Operating supply voltage : VCC (opr) = 8.0 to 18 V (RL = 4 Ω) : VCC (opr) = 8.0 to 16 V (RL = 2 Ω) Note 1: Install the device correctly. Otherwise, the device or system may be degraded, damaged or even destroyed. Note 2: The protection features are intended to avoid output short-circuits or other abnormal conditions temporarily. It is not guaranteed that they will prevent the IC from being damaged. Exposure to conditions beyond the guaranteed operating ranges may not activate the protection features, resulting in an IC damage due to output short-circuits.
1
2009-01-29
Datasheet pdf - http://www.DataSheet4U.net/
TB2946HQ
Block Diagram
+B
C5
C2
10 Ripple
1 TAB
6 VCC2
20 VCC1 9 8 7 Out1 (+) PW-GND1 Out1 (−)
C1
11
IN1
C1 12
IN2 5 2
Out2 (+) PW-GND2 Out2 (−)
13 Pre-GND
3
C1
15
IN3 17 18
Out3 (+) PW-GND3
C6
16 AC-GND
Out3 (−) 19
C1
14
IN4 21
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Out4 (+) PW-GND4 Out4 (−)
5V Play Mute 4 Stby R1 C4 22 Mute Offset/short
24 23
25
Some of the functional blocks, circuits or constants may be omitted from the block diagram or simplified for explanatory purposes.
C3 RL RL RL RL
2
2009-01-29
Datasheet pdf - http://www.DataSheet4U.net/
TB2946HQ
Detailed Description
1. Standby Switch (pin 4)
The power supply can be turned on or off via pin 4 (Stby). The threshold voltage of pin 4 is set at about 3 VBE (typ.). The power supply current is about 0.01 μA (typ.) in the standby state.
VCC ON OFF Power 4 10 kΩ ≈ 2 VBE to Bias filter network
Standby Control Voltage (VSB): Pin 4
Standby ON OFF Power OFF ON VSB (V) 0 to 0.9 2.9 to VCC
Figure 1 Setting Pin 4 High Turns on Power
Check the pop levels when the time constant of pin 4 is changed.
Benefits of the Standby Switch
(1) (2) VCC can be directly turned on or off b.