A class D power amplifier chip
A power amplifier chip and power tube technology, applied in the field of class D power amplifier chips, can solve the problems of the first output driver and the second output driver of the class D power amplifier chip cannot be turned off, the overcurrent signal is filtered by the wrong pulse width, etc. Safe operation, guaranteeing the effect of immediate response
Active Publication Date: 2016-01-20
SHANGHAI BEILING
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Problems solved by technology
[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a class D power amplifier chip, which can solve the problem that the overcurrent signal is filtered by the wrong pulse width due to the high potential pulse width of the overcurrent signal is too low, resulting in a class D power amplifier The technical problem that the first output driver and the second output driver on the chip cannot be turned off
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[0023] see Figure 5 In order to better understand the technical solution of the present invention, the inventors of the present invention will describe in detail below through specific embodiments in conjunction with the accompanying drawings:
[0024] Figure 5 Shown is a circuit diagram of a class D power amplifier chip of the present invention, the class D power amplifier chip includes an amplification module 11 , a PMW modulation module 12 , a first output driver 13 , a second output driver 14 , a load 17 and an overcurrent protection circuit 2 . The output end of the first output drive 13 is provided with a first power tube 15, the output end of the second output drive 14 is provided with a second power tube 16, and both the first power tube 15 and the second power tube 16 are It is formed by connecting two output switch tubes in series.
[0025] The P output terminal of the amplification module 11 and the P input terminal of the PMW modulation module 12 are connected ...
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The invention discloses a class D power amplifier in the field of integrated circuits. The class D power amplifier chip comprises a PWM (Pulse Width Modulation) module, a first output driver, a second output driver, a load and an overcurrent protection circuit; the output end of the first output driver is provided with a first power tube, the output end of the second output driver is provided with a second power tube, a filter is arranged on the overcurrent protection current; a voltage difference between two input ends of the PWM module can be adjusted from 0 to full-amplitude voltage difference of a power supply; and when the voltage difference between the two input ends of the PWM module is the full-amplitude voltage difference of the power supply, the PWM module continuously outputs a first full-amplitude PWM signal and a second full-amplitude PWM signal which are inverted in phase. The class D power amplifier disclosed by the invention has the beneficial effects of being capable of solving the technical problem of pulse width mis-filtration by the filter on the overcurrent protection circuit because of overlow high-potential pulse width of an overcurrent signal.
Description
technical field [0001] The invention relates to a class D power amplifier chip in the field of integrated circuits. Background technique [0002] see figure 1 , the current class D power amplifier chip includes: an amplification module 11 , a PWM modulation module 12 , a first output driver 13 , a second output driver 14 , a load 17 and an overcurrent protection circuit 2 . The P output terminal of the PWM modulation module 12 is connected to the first output driver 13 , and the N output terminal of the PWM modulation module 12 is connected to the second output driver 14 . The output end of the first output drive 13 is provided with a first power tube 15, the output end of the second output drive 14 is provided with a second power tube 16, and the load 17 is connected to the first power tube 15 and the Describe the second power tube 16. The waveform of the audio input signal input to the amplification module 11 is as figure 2 As shown, the audio input signal is amplifie...
Claims
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IPC IPC(8): H03F3/20
Inventor 常祥岭
Owner SHANGHAI BEILING