TB2941HQ
Bi-CMOS Linear Integrated Circuit Silicon Monolithic
TB2941HQ
Maximum Power 49 W BTL
×
4ch Audio Power Amp IC
1.
Description
The TB2941HQ is a power IC with built-in four-channel BTL
amplifier developed for car audio application. The maximum
output power P
OUT
is 49 W using a pure complementary P-ch and
N-ch DMOS output stage.
In addition, a standby switch, a mute function, output offset
voltage detector, high-side switch and various protection features
are included.
2.
Applications
Weight: 7.7 g (typ.)
Power Amp IC developed for car audio applications.
3.
Features
•
High output power, low distortion, and low noise property (for details, refer to the Table 1 Typical
Characteristics).
•
Built-in high-side switches. (Pin25) (Note2)
•
Built-in detecting output offset voltage. (Pin1,Pin25) (Note2)
•
Built-in muting function. (Pin22)
•
Built-in auto muting functions (for low Vcc and stand-by
sequence)
•
Built-in stand-by switch. (Pin4)
•
Built-in various protection circuits (thermal shut down,
over-voltage, short to V
CC
, short to GND, and output to output
short)
Table 1 Typical Characteristics
(Note1)
Test condition
Typ.
Unit
Output power
(P
OUT
)
V
CC
= 15.2 V, JEITA max
V
CC
= 13.7 V, JEITA max
THD
=
10%
49
40
W
24
Output power
(P
OUT
) (R
L
= 2
Ω)
V
CC
= 13.7 V, JEITA max
THD = 10%
73
W
45
Total harmonic distortion
(THD)
P
OUT
= 4 W
0.006
%
Output noise voltage
(V
NO
) (Rg = 0
Ω)
Filter
:
DIN AUDIO
65
µVrms
Operating Supply voltage range
(V
CC
)
RL = 4
Ω
6 to 18
V
6 to 16
Note1:
Rg: signal source resistance
Note2:
Pin25 functions are selected by mute terminal (pin 22) voltage.
RL = 2
Ω
Typical test conditions: V
CC
=
13.2 V, f
=
1 kHz, R
L
=
4
Ω,
Ta
=
25°C; unless otherwise specified.
1
2015-07-22
TB2941HQ
4.
Block Diagram
C2: 10
μF
10
Ripple
6
V
CC2
20
V
CC1
9
11
C1: 0.22
μF
IN1
MPC
DFA
OUT1 (+)
8
PW-GND1
OUT1 (−)
AC-GND
7
C1: 0.22
μF
IN2
12
5
DFA
OUT2 (+)
MPC
2
PW-GND2
OUT2 (−)
13 Pre-GND
AC-GND
3
C1: 0.22
μF
IN3
15
17
OUT3 (+)
PW-GND3
C6: 1
μF
MPC
DFA
18
OUT3 (−)
16 AC-GND
AC-GND
19
C1: 0.22
μF
IN4
14
OUT4 (+)
21
PW-GND4
5V
Play
Mute
4 Stby
R1: 47 kΩ
C4: 1
μF
22 Mute
AC-GND
MPC
DFA
24
23
OUT4 (−)
H-SW / Offset Det
Offset Det
25
1
Some of the functional blocks, circuits or constants labels in the block diagram may have been omitted or simplified
for clarity.
In the following explanation, a "channel" is a circuit which consists of INx, OUTx (+), OUTx (-), and PW-GNDx. (x:1
to 4)
C3: 0.1
μF
R
L
R
L
R
L
R
L
C5:
3900
μF
+B
2
2015-07-22
TB2941HQ
5.2
Pin Function Descriptions
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Symbol
Offset Det
PW-GND2
OUT2(-)
Stby
OUT2(+)
VCC2
OUT1(-)
PW-GND1
OUT1(+)
Ripple
IN1
IN2
Pre-GND
IN4
IN3
AC-GND
OUT3(+)
PW-GND3
OUT3(-)
VCC1
OUT4(+)
MUTE
OUT4(-)
PW-GND4
H-SW/OffsetDet
I/O (Note1)
V
od
-OUT
―
OUT
V
ST
-IN
OUT
V
CC
-IN
OUT
―
OUT
―
IN
IN
―
IN
IN
―
OUT
―
OUT
V
CC
-IN
OUT
V
mute
IN
OUT
―
HSW/V
od
-OUT
Description
Output offset voltage detector output
Ground for OUT2
OUT2(-) output
Stand-by voltage input
OUT2(+) output
Supply voltage 2
OUT1(-) output
Ground for OUT1
OUT1(+) output
Ripple voltage
OUT1 input
OUT2 input
Signal ground
OUT4 input
OUT3 input
Common reference voltage for all input
OUT3(+) output
Ground for OUT3
OUT3(-) output
Supply voltage 1
OUT4(+) output
Mute voltage input
OUT4(-) output
Ground for OUT4
High-side switch / Offset detector output
4
2015-07-22
TB2941HQ
6.
Functional Description
C2: 10
μF
10
Ripple
6
V
CC2
20
V
CC1
9
C3: 0.1
μF
R
L
R
L
R
L
OUT3 (−)
R
L
C5:
3900
μF
+B
11
C1: 0.22
μF
IN1
MPC
DFA
OUT1 (+)
8
PW-GND1
OUT1 (−)
AC-GND
7
C1: 0.22
μF
IN2
12
5
DFA
OUT2 (+)
MPC
2
PW-GND2
OUT2 (−)
13 Pre-GND
AC-GND
3
C1: 0.22
μF
IN3
15
17
OUT3 (+)
PW-GND3
C6: 1
μF
MPC
DFA
18
16 AC-GND
AC-GND
19
C1: 0.22
μF
IN4
14
OUT4 (+)
21
PW-GND4
5V
Play
Mute
4 Stby
R1: 47 kΩ
C4: 1
μF
22 Mute
AC-GND
MPC
24
23
OUT4 (−)
H-SW / Offset Det
Offset Det
25
1
Component
Name
C1
C2
C3
C6
C5
R1 / C4
Recommended
Value
0.22
μF
10
μF
0.1
μF
1
μF
3900
μF
47 kΩ
/
1
μF
Effect (Note1)
Pin
INx
(x:1 to 4)
Ripple
V
CC1,
V
CC2
AC-GND
V
CC1,
V
CC2
Mute
Purpose
Lower than Recommended Value
To eliminate DC
To reduce ripple
To provide sufficient
oscillation margin
Common reference
voltage for all input
Ripple filter
Mute ON/OFF
Smooth switching
Cut-off frequency becomes higher
Turn on/off time shorter
Higher than Recommended Value
Cut-off frequency becomes lower
Turn on/off time longer
Reduces noise and provides sufficient oscillation margin
Pop noise is suppressed when C1: C6 = 1:4. (Note2)
Power supply ripple filtering
Pop noise becomes larger
Switching time becomes longer
Note1: When the unrecommended value is used, please examine it enough by system evaluation.
Note2: Since “AC-GND” pin is a common reference voltage for all input, this product needs to set the ratio of an input
capacitance (C1) and the AC-GND capacitance (C6) to 1:4
Note3: Use the low leak current capacitor for C1 and C6.
5
2015-07-22
微控制器 MCU
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