la4810m Sanyo Semiconductor Corporation, la4810m Datasheet - Page 7

• Manufacturer Part Number: la4810m
• Description: Stereo/monaural Btl Power Amplifier
• Manufacturer: Sanyo Semiconductor Corporation

Operating Precautions
1. Electronic volume control (pin 14)
The voltage gain of the variable gain preamplifier can be changed by controlling the dc voltage at pin 14 (max. gain is
approx. 13.5 dB). Pin 14 must be connected to GND when the internal electronic volume control is not to be used.
The recommended resistance of the external variable resistor is 20 kΩ or greater.
2. Stereo/BTL selector pin (pin 2)
The stereo and monaural BTL modes can be selected by controlling pin 2.
3. Phase compensation components (C6, R1, C7, and R2)
Note that the values of the phase compensation capacitors and resistors to be connected to the output pins (pins 7 and
10) vary depending on their print pattern.
4. Power supply bypass capacitor (C11)
The bypass capacitor C11 must be placed as close to the power pin (pin 9) as possible.
5. Ground of the power amplifier output stage
Pins 6 and 11 serve as GND pins for the power amplifier output stage. Their print pattern must be designed so that the
pins are kept as low in impedance as possible.
6. Short-circuit across pins
Turning on the IC with some of its pins short-circuited may cause characteristic deterioration of or fatal damage to the
IC. After installing the IC on a board and before turning on power, make sure that its pins are not short-circuited by
solder or other foreign materials.
7. Short-circuit of the load
Keeping the IC with its load short-circuited for an extended period of time may cause characteristic deterioration of or
fatal damage to the IC. Never short-circuit the load of the IC.
8. Maximum ratings
It is likely that the maximum ratings of the IC may be exceeded on a slight change in operating conditions if the IC is
used at or near its ratings. Since such a condition may lead to a fatal failure accident, allow for adequate margins for
fluctuations in supply voltage and to make sure that the IC is used within its maximum ratings range.
Maximum gain → V14=0V (GND)
Minimum gain → V14=1.25V (voltage at pin 15)
Stereo mode
BTL mode
C6, C7: 0.1 µF or greater
R1, R2: 1.5 to 4.7 Ω
Pin 2 → Connect to GND (or 0.3V or below).
Pin 2 → Keep open.
LA4810M
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