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TA8220H Dataheets PDF



Part Number TA8220H
Manufacturers Toshiba Semiconductor
Logo Toshiba Semiconductor
Description 30W BTL x 2CH AUDIO POWER AMPLIFIER
Datasheet TA8220H DatasheetTA8220H Datasheet (PDF)

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8220H 30W BTL × 2ch Audio Power Amplifier TA8220H The thermal resistance θj−T of TA8220H package designed for low thermal resistance, has high efficiency of heat radiation. The temperature rise of chip can be reduced, and the influence from the degradation of the features due to the temperature rise at the high output can also be reduced. This stereo audio power IC, designed for car audio use, has two built−in channels to reduce th.

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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8220H 30W BTL × 2ch Audio Power Amplifier TA8220H The thermal resistance θj−T of TA8220H package designed for low thermal resistance, has high efficiency of heat radiation. The temperature rise of chip can be reduced, and the influence from the degradation of the features due to the temperature rise at the high output can also be reduced. This stereo audio power IC, designed for car audio use, has two built−in channels to reduce the characteristic difference between L and R channels. It also contains output short detection circuit, output clip detection and various kind of protection. Features · Low thermal resistance: θj−T = 1.5°C / W (infinite heat sink) · High power: POUT (1) = 30W (typ.) / channel (VCC = 14.4V, f = 1kHz, THD = 10%, RL = 2Ω) : POUT (2) = 26W (typ.) / channel (VCC = 13.2V, f = 1kHz, THD = 10%, RL = 2Ω) : POUT (3) = 19W (typ.) / channel (VCC = 13.2V, f = 1kHz, THD = 10%, RL = 4Ω) Weight: 9.8g (typ.) · Low distortion ratio: THD = 0.04% (typ.) (VCC = 13.2V, f = 1kHz, POUT = 1W, RL = 4Ω, GV = 50dB) · Low noise: VNO = 0.30mVrms (typ.) (VCC = 13.2V, RL = 4Ω, GV = 50dB, Rg = 0Ω, BW = 20Hz~20kHz) · Built−in stand−by function (with (4)pin set at low, power is turned off.): ISB = 1µA (typ.) · Built−in output short detection circuit ((9)pin: Open collector) · Built−in output clip detection circuit ((1)pin: Open collector) · Built−in various protection circuits Protection circuits: Thermal shut down, Over voltage, Out→VCC short, Out→GND short and Out−Out short. · Operating supply voltage: VCC = 9~18V 1 2002-10-30 Block Diagram TA8220H (GV = 50dB) TA8220H Caution And Application Method (description is made only on the single channel.) 1. Voltage gain adjustment This IC has the amplifier constructions as shown Fig.1. The pre-amp (amp1) is provided to the primary stage, and the input voltage is amplified by the flat amps, amp3 and amp4 of each channel through the phase amp (amp2). Since the input offset is prevented by pre-amp when VCC is set to on, this circuit can remarkably reduce the pop noise. 2 2002-10-30 TA8220H The total closed loop gain GV of this IC can be obtained by expression below when the closed loop voltage gain of amp1 is GV1. GV1 = 20log R1 + (Rf + R2 Rf + R2 ) (dB)L L L (1) The closed loop voltage gain of power amp, amp3 and amp4 is fixed at GV3≒GV4 = 20dB. Therefore, the total closed circuit voltage gain GV is obtained through BTL connection by the expression below. GV = GV1 + GV3 + 6 (dB)………(2) For example, when Rf = 0Ω, GV is obtained by the expressions (1) and (2) as shown below. GV≒24 + 20 + 6 = 50dB The voltage gain is reduced when Rf is increased. (Fig.2) With the voltage gain reduced, since (1) the oscillation stability is reduced, and (2) the pop noise changes when VCC is set to on, refer to the items 3 and 4. 2. Stand-by SW function By means of controlling (4)pin (stand-by terminal) to high and low, the power supply can be set to on and off. The threshold voltage of (4)pin is set at 2.1V (3VBE), and the power supply current is about 1µA (typ.) at the stand-by state. Control voltage of (4)pin: V (SB) Stand-By Power V (SB) (V) On Off 0~2 Off On 3~VCC (1) Since VCC can directly be controlled to on / off by the microcomputer, the switching relay can be omitted. (2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory for switching. 3 2002-10-30 TA8220H 3. Preventive measure against oscillation For preventing the oscillation, it is advisable to use C4, the condenser of polyester film having small characteristic fluctuation of the temperature and the frequency. The condenser (C6) between input and GND is effective for preventing oscillation which is generated with a feedback signal from a output stage. The resistance R to be series applied to C4 is effective for phase correction of high frequency, and improves the oscillation allowance. (1) Voltage gain to be used (GV setting) (2) Capacity value of condenser (3) Kind of condenser (4) Layout of printed board In case of its use with the voltage gain GV reduced or with the feedback amount increased, care must be taken because the phase-inversion is caused by the high frequency resulting in making the oscillation liable generated. 4. Adjustment of output offset (when the power supply turn on) As this IC is constructed with DC circuit on the pre-amp stage, it is necessary to lower a input offset or output offset by agreement with the each leading edge time constant of the input voltage in the pre-amp stage and NF terminal voltage. Concretely, monitor the output DC voltage and vary the capacity value in input condenser and NF condenser (see Fig.4) (Reference) In case of setting the condition (GV = 40dB) with Rf = 470Ω 4 2002-10-30 TA8220H 5. Output clip detection function (pin(1)) The output clip detection terminal of pin(1) has the open collector output str.


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