TDA 8950TH ST Class D Amplifier and Switching power supply
TDA8950TH Philips latest high efficiency (2X150W) D audio amplifier, IC use HSOP24 power package with low power consumption and static current. The Class D audio amplifier with zero dead zone switching, advanced current protection, smooth start of work, no general power amplifier (flapping – flapping) the impact of sound.
Over current, over voltage, over temperature protection, as a stereo single-ended amplifier SE (gain 30dB) or BTL mono amplifiers (gain 36dB), the most suitable for home audio, multimedia systems, car audio applications.
Good amplifier IC is a very important prerequisite, a good application circuit is also necessary requirements. For digital audio amplifier, the most critical and the emphasis is on PCB board layout techniques and processes, whether it is from the electrical properties of the test indicators, such as distortion, signal to noise ratio, dynamic range, etc., or from listening In effect, all after all a very good comprehensive evaluation of class D amplifier.
Power supply by the company’s high-power switching power supply driver module (SPDM) of the circuit, power supply output voltage + /-37VDC (500w). The power half-bridge design, with: high efficiency, high stability; no feedback open-loop design, quicker response; oscillation frequency of 80KHz, the ripple is extremely small, the amplifier output can hardly hear any noise. This board has been mass-produced and exported to Europe and other markets, in line with EMC, UL, CCC and other safety standards.
The amplifier board PCB with 4mm thick aluminum plate heat sink lower, IC and the radiator is used between the copper and alumina ceramic thermal conductivity and insulation, the thermal conductivity of alumina ceramics is common mica, silicone film dozens of times, the power IC and the radiator of the temperature control at 5 degrees.
Basic performance parameters:
Dimensions: length 140mm, width 95mm, height 61mm (including radiators).
Work: CLASS-D + switching power supply
Machine efficiency: greater than 80%.
True RMS output power:
SE (stereo): 100W * 2, THD <1%,, 4ohm load.
170W * 2 THD = 10%, 4ohm load.
60W * 2, THD <1%, 8ohm load.
BTL (bridged): 180W, THD <1%, 8ohm load
250W, THD <10%, 8ohm load
Frequency response: 20Hz to 30KHz
Switching power supply voltage: 220VAC + / -10%
Maximum output current: 10A
Maximum working temperature: 150 ‘C
Distortion and frequency response of the AP test, please refer to the following curve.