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PDF TB2905HQ Data sheet ( Hoja de datos )
| Número de pieza | TB2905HQ | |
| Descripción | Low-Frequency Power Amplifier IC | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TB2905HQ (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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TB2905HQ
TOSHIBA Bi-CMOS Digital Integrated Circuit Silicon Monolithic
TB2905HQ
Class KB High-Efficiency, Low-Frequency Power Amplifier IC
Maximum Power: 47 W × 4 Channels
The TB2905HQ is a high-efficiency class KB power amplifier
IC developed for car audio applications that incorporates four
BTL amplifier channels.
It employs a pure complementary DMOS output stage
www.DataSheetc4oUn.csoismting of P-ch upper and N-ch lower sections, offering a
maximum output power (POUT) of 47 W.
Class KB (keyed BTL) amplifiers exhibit less than half the
heat generation of comparable class AB solutions under normal
operating conditions. Therefore, it is possible to design a smaller
heatsink and maintain lower internal temperature in the car
Weight: 7.7 g (typ.)
audio sets.
Additionally, the TB2905HQ has many built-in functions for car audio, such as standby switching, muting,
protective circuits, and self diagnosis.
Features
• High output power
: POUT MAX (1) = 47 W (typ.)
(VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω)
: POUT MAX (2) = 43 W (typ.)
(VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 Ω)
: POUT Pout MAX (3) = 80 W (typ.)
(VCC = 14.4V, f = 1 kHz, JEITA max, RL = 2 Ω)
: POUT (1) = 29 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
: POUT (2) = 25 W (typ.)
(VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
: POUT (3) = 55 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%,RL = 2 Ω)
• Low distortion ratio
: THD = 0.03% (typ.)
(VCC = 13.2 V, f = 1 kHz, GV = 26dB, POUT = 2 W, RL = 4 Ω)
• Low noise
: VNO = 120 µVrms (typ.)
(VCC = 13.2 V, GV = 26dB, Rg = 0 Ω, BW = 20 Hz~20 kHz, RL = 4 Ω)
• Built-in standby (pin 4) and muting (pin22) functions
• Built-in offset/clipping detection (pin 25)
• Protective circuits: Thermal shutdown, overvoltage, out to GND, out to VCC, out to out short
• Operating supply voltage: VCC (opr) = 9 to 18 V (RL = 4 Ω)
Note 1: Some pins of this product are sensitive to electrostatic discharge. When handling this product, ensure that
the environment is protected against electrostatic discharge.
Note 2: Install the product correctly. Otherwise, the product or connected equipment may get damaged or degrade.
Note 3:
These protective features are intended to temporarily prevent an output short circuit or other abnormal
conditions from occurring. Toshiba does not guarantee that they prevent the IC from being damaged.
If the product is operating outside any of the guaranteed operating ranges, these protective features may
not operate and an output short circuit may result in the IC being damaged.
1 2005-08-17
1 page  
TB2905HQ
4. Offset Detection Function
Pin 25 can be used to detect an offset voltage that may appear on an output pin due to input capacitor
leakage or other reasons.
V Output DC voltage (+) (for RS1)
Capacitor leakage
Vref or short-circuit
Electrical
volume
RS1
Vref/2
Vbias
www.DataSheet4U.com
VCC/2 (normal DC voltage)
+
−
25
Output DC voltage (−) (for RS2)
Output offset voltage
(upon input capacitor leakage or short-circuit)
5V
L.P.F.
smoothing
To microcontroller The
A
circuit
B
microcontroller shuts down the
system if the output is lower than
the specified voltage.
Figure 6 Example application and detection mechanism
Output DC
voltage (+)
GND
Voltage at point A
(output of pin 25)
GND
Voltage at point B
(LPF output)
GND
Offset detection threshold
(RS1 detection)
VCC/2
(normal DC voltage)
Offset detection threshold
(RS2 detection)
Time
Time
RS2 Time
5 2005-08-17
5 Page 
T.H.D – POUT (OUT)
100
VCC = 13.2 V
RL = 4 Ω
Ch = 1 ch, 3 ch
10
1
www.DataSheet4U.com
10 kHz
0.1
1 kHz
100 Hz
0.01
0.1
1
10
Output power POUT (W)
100
T.H.D – POUT (OUT)
100
VCC
RL = 4 Ω
Ch = 1 ch, 3 ch
9V
13.2 V
10 16 V
1
0.1
0.01
0.1
1 10
Output power POUT (W)
100
TB2905HQ
T.H.D – POUT (OUT)
100
VCC = 13.2 V
RL = 4 Ω
Ch = 2 ch, 4 ch
10
1
0.1 10 kHz
100 Hz
1 kHz
0.01
0.1
1 10
Output power POUT (W)
100
T.H.D – POUT (OUT)
100
VCC
RL = 4 Ω
Ch = 2 ch, 4 ch
9V
13.2 V
10 16 V
1
0.1
0.01
0.1
1 10
Output power POUT (W)
100
11 2005-08-17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet TB2905HQ.PDF ] | |
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