TB2905HQ PDF Datasheet

Спецификация TB2905HQ изготовлена «Toshiba Semiconductor» и имеет функцию, называемую «Low-Frequency Power Amplifier IC». На этой странице представлена подробная информация о характеристиках и технических характеристиках детали. Если вы правильно понимаете эти части, они могут помочь вам завершить ваши проекты и отремонтировать детали.

Детали детали

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

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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.

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Block Diagram

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Ripple

C1 IN1

C1 IN2

TAB

VCC2

VCC1

OUT1 (+)

PW-GND1 8

OUT1 (−)

OUT2 (+)

PW-GND2 2

OUT2 (−)

STBY 4

RL = 4 ohm

C1 IN3

C1 IN4

16 AC-GND

OUT3 (+)

PW-GND3 18

OUT3 (−)

RL = 4 ohm

OUT4 (+)

PW-GND4 24

OUT4 (−)

MUTE

RL = 4 ohm

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.

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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 kΩ

VCC

≈ 2 VBE

To bias

cutoff circuit

Pin 4 control voltage: VSB

Stand-by

OFF

Power

OFF

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.

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TB2905HQ PDF Datasheet

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