IRAUDAMP8 International Rectifier, IRAUDAMP8 Datasheet - Page 24

• Manufacturer Part Number: IRAUDAMP8
• Description: BOX / 9999V 999.000A OTHER
• Manufacturer: International Rectifier

Specifications of IRAUDAMP8

• Lead Free Status / Rohs Status: Not Compliant

Usually, the power supply has no way to absorb the energy coming back from the load.
Consequently the bus voltage is pumped up, creating bus voltage fluctuations.
Following conditions make bus pumping worse:
The OVP protects IRAUDAMP8 from failure in case of excessive bus pumping. One of the easiest
counter measures of bus pumping is to drive both of the channels in a stereo configuration out-of-
phase so that one channel consumes the energy flow from the other and does not return it to the
power supply. Bus voltage detection monitors only +B supply, assuming the bus pumping on the
supplies is symmetric in +B and -B supplies.
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1. Lower output frequencies (bus-pumping duration is longer per half cycle)
2. Higher power output voltage and/or lower load impedance (more energy transfers between
3. Smaller bus capacitance (the same energy will cause a larger voltage increase)
supplies)
Blue: VS of CH3;Cyan: VS of CH2;Magenta: Voltage of +B;Green:Current of C13A
Fig 20
Auto-phase sync clock’s BUS Pumping when idling
IRAUDAMP8 REV
1.0
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