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PDF TB2938HQ Data sheet ( Hoja de datos )

Número de pieza TB2938HQ
Descripción Maximum Power 49W BTL x 4-ch Audio Power IC
Fabricantes Toshiba 
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No Preview Available ! TB2938HQ Hoja de datos, Descripción, Manual

Bi-CMOS Linear Integrated Circuit Silicon Monolithic
TB2938HQ
TB2938HQ
Maximum Power 49W BTL 4-ch Audio Power IC
1. Description
The TB2938HQ 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 49W.
It includes a standby switch, mute function and various
protection features.
2. Applications
Power IC developed for car audio applications.
Weight: 7.7 g (typ.)
3. Features
High output power, low distortion, and low noise property (for details, refer to the Table 3-1)
Built-in various detection function (Output DC offset detection, Output short, Output layer short) (pin25)
Built-in various mute functions (low voltage, standby on/off) (pin22)
Built-in standby switch (pin4)
Built-in mute switch (pin22)
Start stop Cruising corresponded (at Vcc=6V)
Built-in various protection circuits (thermal shut down, over-voltage, short to GND, short to VCC, and output to
output short, speaker current limiting)
Table 3-1 Typical Characteristics
(Note1,Note2)
Condition
Typ. Unit
Output power (POUT)
VCC = 15.2 V, JEITA max
49
VCC = 14.4 V, JEITA max
44
VCC = 14.4 V, THD = 10%
29
THD = 10%
24
W
Total harmonic distortion (THD)
POUT = 5 W
0.01 %
Output noise voltage (VNO) (Rg = 0 ),
BW = 20 Hz to 20 kHz
50 µV
Operating Supply voltage range (VCC)
RL = 4
6 to 18 V
Note1: Typical test conditions: VCC = 13.2 V, f = 1 kHz, RL = 4 , GV = 26 dB, Ta = 25°C; unless otherwise specified.
Note2: Rg: signal source resistance
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TB2938HQ pdf
TB2938HQ
6. Detailed Description
6.1 External Component Constants
C2: 10μF
10
Rippl
C1: 0.22 F 11 IN1
16
20
TAB VCC2 VCC1
9 OUT1
8 PW-GND
OUT1
7
RL 4Ω
C1: 0.22 F 12 IN2
13 Pre-GND
5 OUT2
2 PW-GND
3 OUT2
RL 4Ω
C1: 0.22 F 15 IN3
C6: 1 F
16 AC-GND
R2: C1/C6×Rg
C1: 0.22 F 14 IN4
5V
4 Stb
Play
Mute
R1: 47kΩ 22 Mut
17 OUT3
PW-GND
18
OUT3
19
RL 4Ω
21 OUT4
24 PW-GND
23 OUT4
RL 4Ω
Det 25
Component
Name
Recommende
d
Value
Pin
Purpose
Effect (Note4)
Lower than Recommended Value Higher than Recommended Value
C1
0.22 μF
INx(x:1to4)
To eliminate DC Cut-off frequency becomes higher Cut-off frequency becomes lower
C2 10 μF(Note5) Ripple
To reduce ripple
Turn on/off time and turn-on diag. Turn on/off time and turn-on diag.
cycle shorter
cycle longer
C3
0.1 μF
VCC1, VCC2 To provide sufficient
oscillation margin
Reduces noise and provides sufficient oscillation margin
C4
1uF
Mute
High pop noise. Duration until
To reduce pop noise mute function is turned on/off is
short.
Low pop noise. Duration until mute
function is turned on/off is long.
C5
3900 μF
VCC1, VCC2
Ripple filter
C6
1 μF
AC-GND
Common reference
voltage for all input
Power supply ripple filtering
Pop noise is suppressed when C1: C6 = 1:4. (Note6)
R1
47kΩ
Mute
High pop noise. Duration until
To reduce pop noise mute function is turned on/off is
short.
Low pop noise. Duration until mute
function is turned on/off is long.
R2
2.2kΩ
less(Note7)
AC-GND To reduce pop noise High pop noise.
Low pop noise.
Note4: When the unrecommended value is used, please examine it enough by system evaluation.
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TB2938HQ arduino
TB2938HQ
10.2 Output Short Detection
In case of shorting output to VCC/GND or over voltage power supplied, NPN transistor is turned on.
In case of shorting output to output NPN Tr. is turned on and off in response to the input signal voltage.
10.3 Layer Short Detection
The TB2938HQ may be properly connected to a load such as a 4-speaker, but one of the speaker lines
may be shorted to ground through a low-impedance path. The TB2938HQ can detect such a condition.
VCC
IC out
SP 4
out
GND
The negative () speaker connection is shorted to ground
through a low-impedance path due to some irregularities.
Figure 10-2 Layer Short
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 (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.
11. 6-V Cruising Functionality
The TB2938HQ can continually provide audio output even in the event of an abrupt battery voltage drop as
a result of reboot from idling stop mode. To reduce the turn-on pop, it is recommended to use a resistor of 2.2
kor less for Rg, a signal source resistor. Inserting a resistor of (C1 / C6 Rg) in series with C6 helps to
further reduce the pop.
When Rg > 2.2 k, the amount of pop should be carefully verified in the end-use application environment.
Rg C1
IN1 to 4ch
R2=C1/C6 × Rg
C6
10
16
Figure11-1 Vicinity of the Input Pins
11 2011-11-08

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