07/11/07 Powersoft s.r.l. - P. IVA n. 04644200489 – Via E.Conti, 5 Scandicci - Tel.: (+39) 055 7350230- Fax: 055 7356235
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Thermal constrains
DigiMod 500/1000/1500/2000HV/1000NPS
RISK OF ELECTRIC SHOCK
!
This device must be correctly heatsinked for correct and reliable operation:
Two operating modes are feasible for DigiMod 500/1000/1000NPS.
1) fan cooled operation
2) external heatsink operation
For Digimod1500/2000HV only fan cooling operation is provided
1) Thermal behaviour with upper mounted fan cooler (80X80mm, 24 Vdc) is warranted by
design up to 50°C enviromental temperature with 6 dB power crest factor program operation,
both channels driven on 4 ohms load (Digimod 2000HV on 8 ohms load)
2) Thermal behaviour with external heatsink is related to power operation level and load
impedance.
For the above conditions (1), the dissipated power is:
Maximum dissipated power = Maximum power · (1-Efficiency*)
4**
* Typical efficiency = 0.8
** 6 dB power crest factor program
Considering that thermal protection is set at 75°C on bottom aluminium plate, thermal
resistance of the heatsink is derived from the following formula:
Rth(heatsink) = Maximum operating temperature – Maximum ambient temperature
Maximum dissipated power
For example, with a maximum output power of 1000W and a typical efficiency of 80% the expected
dissipated power is 50W. For a maximum ambient temperature of 45°C and a maximum operating
temperature of the module of 70°C is necessary an heatsink of 0.5°C/W
Rth(heatsink) = 70°C – 45°C = 0.5°C/W
50W
Proper heatsink planarity is strongly suggested to allow thermal transfer from the bottom plate to the
heatsink, thermal compound is recommended also if not strongly necessary.
In case of installation inside of loudspeaker enclosure, proper spacing of at least 100 mm is necessary
between the frame of the unit and side components or surfaces of the enclosure.
Be Aware that this product is designed for audio applications.
High energy long term high frequency output may damage output damping RC network.
High frequency time shaped built in limiter works to limit
high level steady high frequency output signals.
High energy long term output may blow power supply fuses.
Time shaped built in limiter works to limit eccessive power and to reduce clipping distortion.
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