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Class D Switching Power Amplifiers and Power D/A conversion

Phase modulated switcher
Phase modulated switcher
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Old 17th April 2011, 02:58 AM   #11
newvirus2008 is offline newvirus2008  India
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Join Date: Jun 2008
Location: India
Hi guzzibreva1,
Be careful if you use low resistance inductors as there can be current imbalance between the phases. (it is equivalent to paralleling of multiple SMPSs)

The multphase buck is a good configuration and can make a really good amplifier if
1) Optimised properly.
The more number of phases, lesser the conduction loss but more switching loss.
But lesser freq maybe used on each phase to reduce switching loss.
So, deciding on the number of phases itself is something important (or else you maybe spending money and power unnecessarily)

2) Using post-filter feedback
This maybe possibly easier because the lesser ripple in the output allows smaller inductors and capacitors, hence higher bandwidth and lesser delay in output LPF because poles are far away)
A Zobel network (never 10R / 0.1uF but something better ) will make it easier.
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Old 17th April 2011, 08:19 AM   #12
darkfenriz is offline darkfenriz  Poland
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Join Date: Jun 2004
Location: Warsaw
IR2xxx chips are commonly used with success, you just have to level shift the PWM to negative rail and have an auxiliary uply of 12 to 15V related to negative supply.
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