TA8233BH Datasheet PDF - Toshiba


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TA8233BH
Toshiba

Part Number TA8233BH
Description 30W BTL X 2ch Audio Power Amplifier
Page 14 Pages

TA8233BH datasheet pdf
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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8233BH
30W BTL × 2ch Audio Power Amplifier
TA8233BH
The thermal resistance θjT of TA8233BH 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
builtin 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
· High power
Weight: 9.8g (typ.)
: POUT (1) = 30W (typ.) / channel
(VCC = 14.4V, f = 1kHz, THD = 10%, RL = 2)
POUT (2) = 26W (typ.) / channel
(VCC = 13.2V, f = 1kHz, THD = 10%, RL = 2)
POUT (3) = 19W (typ.) / channel
(VCC = 13.2V, f = 1kHz, THD = 10%, RL = 4)
· Low thermal resistance: θjT = 1.5°C / W (infinite heat sink)
· Low distortion ratio: THD = 0.04% (typ.)
(VCC = 13.2V, f = 1kHz, POUT = 1W, RL = 4, GV = 50dB)
· Low noise: VNO = 0.30mVrms (typ.)
(VCC = 13.2V, RL = 4, GV = 50dB, Rg = 0, BW = 20Hz~20kHz)
· Builtin standby function
: (with pin(4) set at low, power is turned off.) ISB = 1µA (typ.)
· Builtin output clip detection circuit
: (pin(1): Open collector (active low))
· Builtin output short detection circuit
: (pin(9): Open collector (active low))
· Builtin various protection circuits
: Thermal shut down, Over voltage, OutVCC short, OutGND short and OutOut short.
· Operating supply voltage: VCC (opr) = 9~18V
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Block Diagram
TA8233BH (GV = 50dB)
TA8233BH
Caution And Application Method
(description is made only on the single channel.)
1. Voltage gain adjustment
This IC has the amplifier constructions as shown in Fig.1. The pre-amp (amp 1) is provided to the primary
stage, and the input voltage is amplified by the flat amps, amp 3 and amp 4 of each channel through the phase
amp (amp 2).
Since the input offset is prevented by pre-amp when VCC is set to on, this circuit can remarkably reduce the pop
noise.
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TA8233BH
The total closed loop gain GV of this IC can be obtained by expression below when the closed loop voltage gain of
amp 1 is GV1.
GV1
=
20log
R1+ (Rf + R2)
Rf + R2
(dB)L L L (1)
The closed loop voltage gain of power amp, amp 3 and
amp 4 is fixed at GV3GV4 = 20dB.
Therefore, the total closed circuit voltage gain GV is
obtained through BTL connection by the expression as
below.
GV = GV1 + GV3 + 6 (dB)………(2)
For example, when Rf = 0, GV is obtained by the
expressions (1) and (2) as below.
GV24 + 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 pin(4) (stand-by terminal) to
high and low, the power supply can be set to on and off.
The threshold voltage of pin(4) is set at 2.1V (3VBE), and
the power supply current is about 1µA (typ.) at the
stand-by state.
Control voltage of pin(4): V (SB)
Stand-By
Power
V (SB) (V)
On Off 0~2
Off On 3~VCC
Adjustage of stand-by SW
(1) Since VCC can directly be controlled to on or 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
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TA8233BH
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 = 470
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