Toshiba TA8227P Datasheet

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic

TA8227P

Low Frequency Power Amplifier

TA8227P is an audio power IC with built-in two channels developed for portable radio cassette tape recorder with power ON/OFF switch. Because of the parts reduction and DIP (Dual Inline Package), space merit is remarkable. Thermal shut down protection circuit is built in.

Features

· High power : P

(VCC = 9 V, RL = 4 Ω, f = 1 kHz, THD = 10%) : P

(VCC = 9 V, RL = 3 Ω, f = 1 kHz, THD = 10%)

· Voltage gain : G : Gv = 56.5dB (typ.) (Rf = 0 Ω, f = 1 kHz)

· Small quiescent current : I

· Ripple rejection ratio : R.R. = −52dB (typ.) (VCC = 9 V, fripple = 100 Hz, Rg = 600 Ω)

· Cross Talk : C.T. = −50dB (typ.) (V

· Output noise voltage : V

· Stand-by switch

· Soft clip

· Built-in thermal shut down protection circuit

· Operation supply voltage range: V

· Low popping noise at power ON

· Best for supply voltage 9 V

= 2.5 W/CH (typ.)

out

= 3.0 W/CH (typ.)

out

= 45.0dB (typ.) (Rf = 120 Ω, f = 1 kHz)

= 21 mA (typ.) (VCC = 9 V, Vin = 0)

CCQ

= 9 V, f = 1 kHz, Rg = 600 Ω)

= 0.3 mVrms (typ.) (VCC = 9 V, Rg = 10 kΩ, BW = 20 Hz~20 kHz)

CC (opr)

= 5~12 V (Ta = 25°C)

Weight: 1.4 g (typ.)

TA8227P

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Block Diagram

TA8227P

Application Information and Application Method

1. Adjustment of voltage gain

The voltage gain Gv is obtained as follows by R1, R2 and Rf in Figure 1.

When Rf = 0 Ω Gv = 56.5dB (typ.)

When R

By increasing R oscillation, it is recommended to use this at 40dB or over.

og20=

= 120 Ω Gv = 45dB (typ.)

2. Thermal shut-down circuit

The thermal shut-down circuit is built in for the purpose of preventing the destruction of IC due to the abnormal temperature rise when the heat radiation is insufficient. The operation temperature is set at radiation Fin temperature 175°C (typ.). At this temperature or over the bias is interrupted to prevent the destruction of IC.

R2+R1+

R1+

Figure 1

, reduction of Gv is possible. However, since the feedback increase is liable to produce

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3. Input stage

The input circuit of this IC is as shown in Figure 2. PNP T capacitor. However, at pin 6 and 7, max 60 mV offset voltage is produced. Application after checking volume slide noise is recommended. For cutting the volume slide noise, insert the input capacitor: C

: Q1 is provided in the input circuit so as to make its usage possible without the input coupling

TA8227P

in series to interrupt the DC component.

4. Oscillation preventive measures

For oscillation preventive capacitor C6 and C7 between the output terminal and GND, it is recommended to use polyester film capacitor having good characteristics for temperature and for high frequency. Since the characteristics of the capacitor is liable to be influenced by the temperature, use this capacitor after the temperature test to check the oscillation allowance. In addition, as the position of the electrolytic capacitor has a remarkable influence on the oscillation, connect C At using this application with the voltage gain reduced, oscillation is liable to be produced. Apply the capacitor after checking enough for its capacity, type and mounting position.

Note 1: As the oscillation allowance varies according to the printed pattern layout, the standard printed board

to VCC at the nearest possible position from power GND.

of TOSHIBA is recommended to be referred to design it.

5. Power ON/OFF switch

There is power ON/OFF switch at pin 1. However, output power is changed by pin 1 supply voltage when pin 1 supply voltage is not same pin 12 supply voltage, after referring to attached data, select pin 1 supply voltage.

6. Input voltage

When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is V

= 300 mVrms (typ.) : VCC = 9 V, RL = 4 Ω, f = 1 kHz: Enough care must be taken for this phenomenon.

(Note 1)

Figure 2

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TA8227P

Maximum Ratings

Characteristics Symbol Rating Unit

DC supply voltage VCC 20 V

Output current (peak/CH) I

Power dissipation PD (Note 2) 4.0 W

Operating temperature T

Storage temperature T

(Ta = 25°C)

2.5 A

O (peak)

−20~75 °C

opr

−55~150 °C

stg

Note 2: Value for mounting on PC board (refer to PD − Ta curve)

Electrical Characteristics

(unless otherwise specified, VCC = 9 V, RL = 4 Ω, Rg = 600 Ω, f = 1 kHz, Ta = 25°C)

Characteristics Symbol

Quiescent current I

Output power

Total harmonic distortion THD ― P

Voltage gain

Input resistance RIN ― ― ― 30 ― kΩ

Output noise voltage Vno ―

Ripple rejection ratio R.R. ― Rg = 600 Ω, fripple = 100 Hz ― −52 ― dB

Cross talk C.T. ―

Input offset voltage V6, V7 ― ― ― 30 60 mV

Stand-by current Istb ― SW1 → OFF ― 1 ― µA

CCQ

out (1)

out (2)

v (1)

v (2)

TYP. DC Voltage of Each Terminal (

Test

Circuit

― Vin = 0 ― 21 45 mA

― THD = 10% 2.0 2.5 ―

― THD = 10%, RL = 3 Ω ― 3.0 ―

―

R V

R BW = 20 Hz~20 kHz

R V

VCC = 9 V, Ta = 25°C

Test Condition Min Typ. Max Unit

= 0.4 W/CH ― 0.2 1.0 %

out

= 120 Ω,

= 0.775 Vrms (0dBm)

OUT

= 0 Ω,

= 0.775 Vrms (0dBm)

OUT

= 10 kΩ,

= 600 Ω,

= 0.775 Vrms (0dBm)

OUT

43 45 47

― 56.5 ―

― 0.3 1.0 mVrms

― −50 ― dB

)

Terminal No. 1

DC Voltage (V) V

4.5 8.7 GND 0.7 0.03 0.03 0.7 5.0 8.7 4.5 V

3 4 5 6 7 8 9 10 11 12

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