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D386 Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers

Part No. D386
Description  Low Voltage Audio Power Amplifier
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Maker  ETC1 [List of Unclassifed Manufacturers]
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Silicore
D386
APPLICATION HINTS
GAIN CONTROL
To ma ke the D386 a mo re versatile amplifier, two pins (1and 8) are provided for gain
control. With pins 1 and 8 open the 1.35 kW resistor sets the gain at 20 (26 dB). If a
capacitoris put from pin 1 to 8, by passing the 1.35 kW resistor, the gain will go up to 200
(46 dB). If a resistor is placed in series with the capacitor, the gain can be set to any value
from 20 to 200. Gain control can also be done by capacitively coupling a resistor (or FET)
from pin 1 to ground.
Additional external components can be placed in parallel with the internal feedback
resistors to tailor the gain and frequency response for individual applications. For example,
we can comp ensate poor speaker bass response by frequency shaping the feedback path.
This is done with a series RC from pin 1 to 5 (paralleling the internal 15 kW resistor).
For 6 dB effective bass boost: R . 15 kW, the lowest value for good stable operation is R =
10 kW if pin 8 is open. If pins 1 and 8 are by passed then R as low as 2 kW can be used.
This restriction is because the amplifier is only comp ensated for closed-loop gains greater
than 9.
INPUT BIASING
The schema tic shows that both inputs are bi ased to ground with a 50 kW resistor. The
base current of the input transistors is about 250 nA, so the inputs are at about 12.5 mV
when left open. If the dc source resistance driving the D386 is higher than 250 kW it will
contribute very little additional offset (about 2.5 mV at the input, 50 mV at the output). If
the dc source resistance is less than 10 kW, then shorting the unused input to ground will
keep the offset low (about 2.5 mV at the input, 50 mV at the output). For dc source
resistances between these values we can eliminate excess offset by putting a resistor from
the unused input to ground, equal in value to the dc source resistance. Of course all offset
problems are eliminated if the input is capacitively coupled.
When using the D386 with higher gains (by p a ssing the 1.35 kW resistor between pins 1
and 8) it is necessary to by pass the unused input, preventing degradation of gain and
possible instabilities. This is done with a 0. 1 ĀµF capacitor or a short to ground depending
on the dc source resistance on the driven input.
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
3/6




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