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TS2576CM5-3.3 Scheda tecnica(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

Il numero della parte TS2576CM5-3.3
Spiegazioni elettronici  3A Step Down Switching Voltage Regulator
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Produttore elettronici  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS2576CM5-3.3 Scheda tecnica(HTML) 6 Page - Taiwan Semiconductor Company, Ltd

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TS2576
6-7
2003/12 rev. A
Grounding
To maintain output voltage stability, the power ground
connections must be low-impedance. For the 5-lead
TO-220 and TO-263 style package, both the tab and pin
3 are ground and rather connection may be used.
Thermal Characteristics
The output ripple voltage is due mainly to the inductor
sawtooth ripple current multiplied by the ESR of the
output capacitor. The output ripple voltage of a switching
power supply will contain a sawtooth ripple voltage at the
switcher frequency, typically about 1% of the output
voltages, and may also contain short voltage spokes of
the sawtooth waveform.
Due to the fast switching action, and the parasitic
inductance of the output filter capacitor, there is voltage
spikes presenting at the peaks of the sawtooth
waveform.
Cautions
must
be
taken
for
stray
capacitance. Wiring inductance, and even the scope
probes used for transients evaluation. To minimize these
voltage spikes, shortening the lead length and PCB
traces is always the first thought. Further more, an
additional small LC filter (30µH & 100µF) (as shown in
Figure 3) will possibly provide a 10X reduction in output
ripple voltage and transients.
Heatsink and Thermal Consideration
Although the TS2576 requires only a small heatsink for
most cases, the following thermal consideration is
important for all operation. With the package thermal
resistances Өja and Өjc , total power dissipation can be
estimated as follows:
PD= (Vin x Iq) + (Vout / Vin) (Iout x Vsat);
When no heatsink is used, the junction temperature rise
can be determined by the following:
∆TJ = PD x Өja
With the ambient temperature, the actual junction
temperature will be:
Tj = ∆Tj + Ta
If the actual operating junction temperature is out of the
safe operating junction temperature (typically 125
oC),
then a heatsink is required. When using a heatsink, the
junction temperature rise will be reduced by the
following :
∆Tj= PD x (Өjc + Ө interface + Ө heatsink );
Also one can see from the above, it is important to
choose an heatsink with adequate size and thermal
resistance, such that to maintain the regulator’s junction
temperature below the maximum operating temperature.


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