conavar
| | Tarih: 21.02.2007, 13:14 Mesaj konusu: Analog PWM Amplifier | |
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sanırım birşeylerin temelini oluşturabilecek güzeL bir döküman...iLgilenenlere duyurulur :)
pcb ve şema ekte arkadaşlar
Supply voltage: 12V 20V
Analog input: -2V +2V
Switching frequency: ~10kHz >300kHz
Dead-time 200nS nom.
Low pass filer Second order response, 37.5kHz cut-off
Abstract:
The analog pulse width modulation amplifier was designed as an integrated “blue box” approach to
demonstrating the PWM process. With suitable component selection, the resulting PWM is of
sufficiently high quality to demonstrate not only motor drive applications but also audio
amplification. The design realizes the PWM discretely: a voltage controlled oscillator to generate
the ramp, a comparator, dead-time logic, and a full H bridge to drive the load. To simplify the gate
drive circuitry, each gate is driven directly from the input bus. In practice this limits the bus
voltage to the maximum Vgs of the FET – about 20V; sufficient to drive a small 8Ω speaker. Test points are provided to allow investigation of every aspect of the PWM process including dead-time.
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