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Номер произв TB2905HQ
Описание Low-Frequency Power Amplifier IC
Производители Toshiba Semiconductor
логотип Toshiba Semiconductor логотип 



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TB2905HQ Даташит, Описание, Даташиты
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 )
: POUT MAX (2) = 43 W (typ.)
(VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 )
: POUT Pout MAX (3) = 80 W (typ.)
(VCC = 14.4V, f = 1 kHz, JEITA max, RL = 2 )
: POUT (1) = 29 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 )
: POUT (2) = 25 W (typ.)
(VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 )
: POUT (3) = 55 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%,RL = 2 )
Low distortion ratio
: THD = 0.03% (typ.)
(VCC = 13.2 V, f = 1 kHz, GV = 26dB, POUT = 2 W, RL = 4 )
Low noise
: VNO = 120 µVrms (typ.)
(VCC = 13.2 V, GV = 26dB, Rg = 0 , BW = 20 Hz~20 kHz, RL = 4 )
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 )
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









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TB2905HQ Даташит, Описание, Даташиты
Block Diagram
www.DataSheet4U.com
10
Ripple
C1 IN1
11
C1 IN2
12
1
TAB
6
VCC2
20
VCC1
OUT1 (+)
9
PW-GND1 8
OUT1 ()
7
OUT2 (+)
5
PW-GND2 2
OUT2 ()
3
STBY 4
+B
RL = 4 ohm
RL = 4 ohm
C1 IN3
15
13
C1 IN4
14
16 AC-GND
OUT3 (+)
17
PW-GND3 18
OUT3 ()
19
RL = 4 ohm
OUT4 (+)
21
PW-GND4 24
OUT4 ()
23
MUTE
22
RL = 4 ohm
R1
Offset/Clip Det 25 LPF
TB2905HQ
Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for explanatory
purpose.
2 2005-08-17









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TB2905HQ Даташит, Описание, Даташиты
Operational Description (Each description applies to a single channel)
TB2905HQ
1. Voltage Gain
The TB2905HQ has no NF (negative feedback) pins. Therefore, the voltage gain (GV) is determined
within the IC.
Input
Amplifier 1
Amplifier 2A
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Amplifier 2B
Figure 1 Amplifier Configuration
Voltage gain of amplifier 1: GV1 = 0 dB
Voltage gain of amplifiers 2A and 2B: GV2 = 20 dB
Voltage gain obtained by BTL connection: GV (BTL) = 6 dB
Therefore, the total voltage gain is determined by the following expression:
GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26dB
Although this configuration without an NF pin does not allow the user to adjust voltage gain, it
eliminates the need for an NF capacitor, resulting in lower total application cost and smaller mounting
space.
2. Standby Switching Function (Pin 4)
The TB2905HQ can be powered up or
down by controlling the state of pin 4
(standby pin).
The threshold voltage for pin 4 is
approximately 3 VBE (typ.). The supply
current in standby state is approximately 2
µA (typ.).
ON Power
OFF
10 k
4
VCC
2 VBE
To bias
cutoff circuit
Pin 4 control voltage: VSB
Stand-by
ON
OFF
Power
OFF
ON
VSB (V)
0~0.5
2.5~6 V
Figure 2 Driving pin 4 high powers up
the TB2905HQ
When changing the time constant for pin 4, check the pop noise produced.
< Advantages of standby switching >
(1) The microcontroller can directly turn VCC on or off without using a switching relay.
(2) Since the control current is microscopic, a switching relay with small current capacity is satisfactory
for switching.
3 2005-08-17










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