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AN2600 Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce AN2600
Description  SMPS for high-end PVR based on L6668
PDF  30 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2600 Fiches technique(HTML) 21 Page - STMicroelectronics

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Figure 14.
High frequency ripple of output voltages at full load at 230 V
3.3
Measurement of RMS current of output capacitors
Table 15 shows the RMS current values flowing into the output capacitors at 230Vac, full
load. All the RMS currents are within the rating of the capacitor type indicated. This avoids
any component overstress that could affect the reliability and the expected lifetime of the
SMPS.
3.4
Dynamic load test
The dynamic load tests have been performed by varying the load on 3.3 V and 5 V outputs,
keeping the other outputs at full load. Varying the load on 3.3 V output, the following results
have been obtained:
CH1: +23 Vout (brown)
CH2: +16 Vout (blue)
CH3: +12 Vout (purple)
CH4: +5 Vout (green)
CH1: -25 Vout (brown)
CH3: +33 Vout (purple)
CH4: +3.3 Vout (green)
Table 15.
Measurement of RMS current of output capacitors at Vin= 230 V and full
load
ICapC77 (16Vout)ICapC91 (3.3Vout)ICapC81 (23Vout)ICapC102 (5Vout)
0.850
1.9
0.550
1



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