TB2946HQ Datasheet PDF - Toshiiba


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TB2946HQ
Toshiiba

Part Number TB2946HQ
Description 49 W X 4-ch BTL Audio Power IC
Page 18 Pages

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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)
Weight: 7.7 g (typ.)
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)
Low THD: 0.007% (typ.) (VCC = 13.2 V, f = 1 kHz, POUT = 5 W, RL = 4 Ω)
Low noise: VNO = 60 μVrms (typ.)
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(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
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Block Diagram
TB2946HQ
10
Ripple
C1 11 IN1
16
TAB VCC2
20
VCC1
+B
9 Out1 (+)
8 PW-GND1
Out1 ()
7
RL
C1 12 IN2
13 Pre-GND
5 Out2 (+)
2 PW-GND2
3 Out2 ()
RL
C1 15 IN3
C6
16 AC-GND
17 Out3 (+)
PW-GND3
18
Out3 ()
19
RL
C1 14 IN4
5V
Play
Mute
R1
4 Stby
22 Mute
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21 Out4 (+)
24 PW-GND4
RL
23 Out4 ()
Offset/short 25
Some of the functional blocks, circuits or constants may be omitted from the block diagram or simplified for
explanatory purposes.
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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.
Standby Control Voltage (VSB): Pin 4
Standby
ON
OFF
Power
OFF
ON
VSB (V)
0 to 0.9
2.9 to VCC
Check the pop levels when the time constant of
pin 4 is changed.
ON Power
OFF
4 10 kΩ
VCC
2 VBE
to Bias
filter network
Figure 1 Setting Pin 4 High Turns on
Power
Benefits of the Standby Switch
(1) VCC can be directly turned on or off by a microcontroller, eliminating the need for a switching relay.
(2) Since the control current is minuscule, a low-current-rated switching relay can be used.
High-current-rated switch
Battery
Relay
Battery
VCC
VCC
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– Conventional Method –
From
microcontroller
Low-current-rated switch
Battery
From microcontroller
Standby VCC
Standby VCC
– Using the Standby Switch –
Figure 2 Standby Switch
Battery
3 2009-01-29
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TB2946HQ
2. Mute Function (pin 22)
The audio mute function is enabled by setting pin 22 Low. R1 and C4 determine the time constant of the
mute function. The time constant affects pop noise generated when power or the mute function is turned on
or off; thus, it must be determined on a per-application basis. (Refer to Figures 3 and 4.)
The value of the external pull-up resistor is determined, based on pop noise value.
For example, when the control voltage is changed from 5 V to 3.3 V, the pull-up resistor should be:
3.3 V / 5 V × 47 kΩ = 31 kΩ
5V
R1
22
C4
1 kΩ
Mute On/Off
control
ATT – VMUTE
20
VCC = 13.2 V
0 f = 1 kHz
RL = 4 Ω
VO = 20dBm
20 BW = 400 Hz to 30 kHz
40
60
80
100
120
0
0.5 1 1.5 2 2.5
Pin 22 control voltage: VMUTE (V)
3
Figure 3 Mute Function
Figure 4 Mute Attenuation VMUTE (V)
www.DataSheet.co.kr
4 2009-01-29
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