TDA2009A BTL 20w Dual Channel Power Amplifier Board uses two TDA2009A chips, connected in BTL mode, can provide 20w output per channel under DC 8-24v power supply, and can drive desktop low-power computer speakers.
The tda2009a is a class ab dual hi-fi audio power amplifier assembled in MULTIWATT® package, specially designed for stereo application as hi-fi and music centers
Schematic TDA2009 BTL stereo 2x 20W power amplifier
All features
- High output power (10 + 10w min. @ d = 1%)
- Ac short circuit protection
- high current capability (up to 3.5a)
- Space and cost saving : very low number of external components and simple mounting thanks to the MULTIWATT® package.
- Thermal overload protection
Build-in protection systems
thermal shut-down
The presence of a thermal limiting circuit offers the
following advantages:
1) an overload on the output (even if it is permanent), or an excessive ambient temperature, can be easily withstood.
2) the heat sink can have a smaller factor of safety compared with that of a conventional circuit. There is no device damage in the case of excessive junction temperature : all that happens is that Po (and therefore Ptot) and I o are reduced.
The maximum allowable power dissipation depends upon the size of the external heat sink (i.e., its thermal resistance); Figure 18 shows this dissipate power as a function of ambient temperature for different thermal resistance.
Short circuit (AC Conditions). The TDA2009A can withstand an accidental short circuit from the output and ground made by a wrong connection during normal play operation.The built-in thermal shut-down protection system in the circuit provides several advantages. It can easily withstand an overload on the output or excessive ambient temperature. This allows for a smaller factor of safety for the heat sink compared to a conventional circuit. In the case of excessive junction temperature, there is no device damage, only a reduction in output power and current. The maximum allowable power dissipation depends on the size of the external heat sink. The TDA2009A can also withstand accidental short circuits from the output to ground during normal operation.
BOM TDA2009 BTL stereo 2x 20W power amplifier
| Parts | Value | Description | Quantity |
| Resistors 1/4W 5% | |||
| R1 | 10kΩ | 10kΩ 6P Potentiometer | 1 |
| R2,R8 | 1kΩ | Brown, black, red, gold | 2 |
| R3,R9 | 2kΩ | red, black, red, gold | 2 |
| R4,R5,R10,R11 | 39Ω | Orange, white, black, gold | 4 |
| R6,R7,R12,R13 | 1Ω | Brown, black, gold, gold | 4 |
| R14 | 10kΩ | Brown, black, orange, gold | 1 |
| R15*,R16* | 56kΩ | Green, blue, orange, gold | 2 |
| Capacitors | |||
| C1,C2,C4,C5 | 2.2uF | Electrolytic capacitor | 4 |
| C3 | 4700uF 25v | Electrolytic capacitor | 1 |
| C6,C10 | 100uF 35V | Electrolytic capacitor | 2 |
| C7,C8,C11,C12 | 220uF | Electrolytic capacitor | 4 |
| C9,C13 | 22uF | Electrolytic capacitor | 2 |
| U13*,U14* | 100pF (101) | Ceramic capacitor | 2 |
| U6,U7,U8,U10,U11,U12 | 100nF (104) | Ceramic capacitor | 6 |
| Semiconductors | |||
| D1 | GBU1510 | GBU Bridge Rectifier | 1 |
| LED1 | 264-7GD | 3 mm LED | 1 |
| U1,U9 | TDA2009A | 10 +10w stereo amplifier | 2 |
| Miscellaneous | |||
| DC1 | DC-005A-20A | DC Power Connector | 1 |
| U2,U3,U4 | KF128-5.08-2P | 2P 5.08 mm Screw Terminal Block | 3 |
| U5 | XH2.54-3P | 2.54 mm 3 pin connector | 1 |
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