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AN3339 Fiches technique(PDF) 14 Page - STMicroelectronics |
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AN3339 Fiches technique(HTML) 14 Page - STMicroelectronics |
14 / 44 page Functional check AN3339 14/44 Doc ID 18449 Rev 2 In Figure 13 the 5 V output voltage ripple has been captured during operation at 115 Vac of the standby converter only. Ripple and noise measured at full load are very limited. Figure 14 shows the waveforms during the startup of only the standby converter at full load. At power-on, the VIPER27LN internal startup current source charges the Vcc capacitor until voltage increases up to the turn-on threshold. At this point the VIPER27LN starts operating and the output voltage reaches the nominal value. During the converter startup the VIPER27LN internal digital fixed time-based (8.5 ms) soft-start limits the drain current which gradually increases to the maximum value. In this way the stress on the secondary diode is considerably reduced and transformer saturation is prevented. The brownout circuits prevent the VIPER27LN from operating if the input voltage is too low. Figure 11. Standby supply waveforms at 400 Vdc, full load Figure 12. Standby supply o/p rectifiers PIV at 400 Vdc, full load CH2: VDD (pin #2) CH1: DRAIN (pin #8) CH3: CONT (pin #3) CH4: FB (pin #4) CH3: PIV D22 CH4: PIV D18 Figure 13. Standby supply 5 V ripple at 115 Vac - 60 Hz, full load Figure 14. Standby supply startup at 115 Vac - 60 Hz, full load CH3: 5 V ripple voltage CH2: 5 V stby CH1: DRAIN (pin #8) CH3: BO (pin #5) CH4: VDD (pin #2) |
Numéro de pièce similaire - AN3339 |
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Description similaire - AN3339 |
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