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SC8002B

The SC8002B is an audio power amplifier IC with turn-off mode. The SC8002B offers a SOP8 package.
When operating at 5V input voltage, the average power on the load (3Ω) is 3W, and the distortion does not exceed 10%. For portable devices, when the VDD is applied to the turn-off end, the SC8002B will enter the turn-off mode, and the power consumption at this time is extremely low, and the IQ is only 0.6uA. The SC8002B is an audio amplifier IC designed for high-power, high-fidelity applications. It requires few peripheral components and can work at an input voltage of 2.0V ~ 5.5V.

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SC8002B Description：

The SC8002B is an audio power amplifier IC with turn-off mode.
When operating at 5V input voltage, the average power on the load (3Ω) is 3W, and the distortion does not exceed 10%. For portable devices, when the VDD is applied to the turn-off end, the SC8002B will enter the turn-off mode, and the power consumption at this time is extremely low, and the IQ is only 0.6uA.
The SC8002B is an audio amplifier IC designed for high-power, high-fidelity applications. It requires few peripheral components and can work at an input voltage of 2.0V ~ 5.5V.

The SC8002B offers a SOP8 package.

SC8002B Features:

No output coupling capacitors or external buffer circuits are required.
Stable gain output.
External gain setting
The SC8002B is available in a SOP8 package

SC8002B Applications:

Can be used in portable devices desktop computers and low voltage operating audio equipment

SC8002B Pin arrangement and description:

SC8002B Function Description:
Bridge arrangement

The SC8002B has two operational amps, but their Settings are different.
The first op amp gain can be set externally with two resistors RF and RJ (+IN and -IN ports), while the second op amp gain is fixed. The output signal of the first op amp is actually the input signal of the second op amp, and the two op amps produce the same number of signals, and the phase is opposite. Therefore, the SC8002B gain is as follows: AVD = 2 x (Rf/Ri) is the driver load, and the op amp is set to bridge mode. The bridge mode is different from some common op-amp circuits that connect one side of the load to the ground, and can make the load produce 4 times the output power under the same conditions.

Power dissipation

Using a bridged op amp circuit, the power consumption generated on the load is also relatively large, so under the condition of a specified voltage, the load power consumption is as follows:

PDMAX = 4× (VDD)2/（2π2）RL

Therefore, at 5V input and 8Ω load, the maximum output power consumption is 625mW. But the results of this algorithm are as follows:
PDMAX = (TJMAX-TA)/ θJA
Note: SOP package θJA=140°C/W, DIP package θJA=107°C/W, MSOP package θJA=210°C/W

Reference voltage

The external capacitor at the voltage reference should be as close to the SC8002B as possible. The 0.1μF capacitor improves the stability of the internal bias voltage and reduces the effect of PSRR. You can increase the ground capacitance of the BYPASS end to improve the PSRR. The CB value depends on the requirements for the PSRR.

Turn-off function

To reduce power consumption, the SC8002B switch off the external bias circuit. When the shutdown end is high power, the op amp is turned off, and the SC8002B does not work, and the working current of the SC8002B is reduced to 0.6uA. When the turn-off terminal voltage is slightly lower than VDD, the SC8002B works stably. Therefore, the turn-off end should be placed at a stable voltage value to avoid the IC entering the wrong working state.
In many applications, the level conversion at the off end is done by the processor. When the unidirectional knife switch is used to achieve the level conversion, a pull resistor can be added to the off end, so that when the switch is off, the level of the SC8002B off end will be in a correct state due to the pull up resistance, so as to ensure that the SC8002B will not enter the wrong working state.

SC8002B limit parameter (Ta=25℃):

peculiarity	symbol	Radius	unit
Operating voltage	VDD	6	V
Input voltage	VIN	-0.3～VDD+0.3	V
Operating temperature	TOPR	-65～+150	℃
Ambient temperature	TA	-40～+85	℃
Node temperature	TJ	150	℃

SC8002B: Electrical parameters(VDD=5V，RL=8Ω，Ta=25℃)

name	symbol	Minimum value	Typical value	Maximum value	unit	Test condition
Operating voltage	VDD	2.0	--	5.5	V
Static current	IDD	--	6.5	10	mA	VIN=0V, IO=0mA
Turn-off current	ISD	--	0.6	2	uA	VPIN1=VDD
Output bias	VOS	--	5.0	50	mV	VIN=0V
Output power	PO	--	1.2	--	W	THD=1%, f=1KHz, RL=8Ω
Output power	PO	--	1.5	--	W	THD=10%, f=1KHz,RL=8Ω
Total harmonic distortion + noise	THD+N	--	0.25	--	%	20Hz≤f≤20KHz, AVD=2, RL=8Ω, PO=1W
Power supply rejection ratio		--	60	--	dB	VDD=4.9V~5.1V

SC8002B circuit schematic diagram:

SC8002B package diagram:

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