Wednesday, February 10, 2010
Rangkaian Amplifier Mono 25Watt
The TDA7482 is an audio class-D amplifier assembled in Multiwatt15 package specially designed for high efficiency applications mainly for TV and Home Stereo sets. Since this chip has only mono channel, you need two pieces of this circuit for stereo application. The power supply voltage is flexible, accept (+ -)10V to (+ -)25V. This circuit needs a split supply (symmetric power supply).
TDA7482 for the main technical parameters:
- 25 W rated output power. Working conditions are: RL = 4 ~ 8 Ω, THD ≤ 10%. In fact, in accordance with the recommendation of the parameters, when RL = 8 Ω, P out = 1 W at its THD is only 0.1 percent.
- has a high output efficiency. When Vcc = ± 21V, RL = 8 Ω, P out = 18 W, the efficiency of 78 percent, so only a small work of the radiator, or even do not have to be.
- wide operating voltage range. Recommended for ± 10V ~ ± 25V, a car battery for power supply.
- are equipped with overcurrent protection devices, when RL = 0 Ω at the threshold for action to protect 3.5 A ~ 5A.
- are equipped with over-voltage protection devices, the threshold for the protection of 50 V.
- overheated overload, overheated temperature close to 150 ℃.
- ST-BY and MUTE functions.
- recommended the carrier frequency PWM operating frequency is 100 kHz ~ 200kHz.
- input noise (20 Hz ~ 20kHz) for 7 μ F ~ 12 μ F.
- input impedance for the 30 k Ω.
IC TDA7482 Pinning
TDA7482 ABSOLUTE MAXIMUM RATINGS
- DC Supply Voltage ±28 V
- Power Dissipation Tcase = 70°C 35 W
- Tj Storage and Junction Temperature –40 to 150 °C
- Maximum Voltage Across RF (pin6) 8 V
- Operating Temperature Range 0 to 70 °C
- Max ESD on Pins ±1.2 KV
Rangkaian 170Watt Amplifier BTL
Combination of the IC LM4651 driver and the LM4652 power MOSFET provides a high efficiency power amplifier solution. The near rail-to-rail switching amplifier substantially increases the efficiency compared to Class AB amplifiers. This high efficiency solution significantly reduces the heat sink size compared to a Class AB IC of the same power level. This two-chip solution is optimum for powered subwoofers and self powered speakers.
Combination of the IC LM4651 driver and the LM4652 power MOSFET provides a high efficiency power amplifier solution. The near rail-to-rail switching amplifier substantially increases the efficiency compared to Class AB amplifiers. This high efficiency solution significantly reduces the heat sink size compared to a Class AB IC of the same power level. This two-chip solution is optimum for powered subwoofers and self powered speakers.
IC LM4651 is a integrated conventional pulse width modulator driver IC. The IC contains short circuit, under voltage, over modulation, and thermal shut down protection circuitry. The LM4651 also contains a standby function which shuts down the pulse width modulation minimizing supply current.
IC LM4652 is a fully integrated H-bridge power MOSFET IC in a TO-220 power package. The LM4652 has a temperature sensor built in to alert the LM4651 when the die temperature of the LM4652 exceeds the threshold. Together, these two IC's form a simple, compact high power audio amplifier solution complete with protection normally seen only in Class AB amplifiers. Few external components and minimal traces between the IC's keep the PCB area small and aids in EMI control.
IC LM4652 is a fully integrated H-bridge power MOSFET IC in a TO-220 power package. The LM4652 has a temperature sensor built in to alert the LM4651 when the die temperature of the LM4652 exceeds the threshold. Together, these two IC's form a simple, compact high power audio amplifier solution complete with protection normally seen only in Class AB amplifiers. Few external components and minimal traces between the IC's keep the PCB area small and aids in EMI control.
Absolute Maximum Ratings LM4651 & LM4652
- Supply Voltage ± 22V
- Output Current (LM4652) 10A
- Power Dissipation (LM4651) 1.5W
- Power Dissipation (LM4652) 32W
- ESD Susceptibility (LM4651) 2000V,
- ESD Susceptibility LM4652 (pins 2,6,10,11) 500V
- ESD Susceptibility (LM4651) (Note 5) 200V
- ESD Susceptibility LM4652 (pins 2,6,10,11) 100V
- Junction Temperature 150°C
- Soldering Information N, TA and TF Package (10 seconds) 260°C
- Storage Temperature −40°C to + 150°C
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