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AN3339 Fiches technique(PDF) 14 Page - STMicroelectronics

No de pièce AN3339
Description  185 W power supply with PFC and standby supply for LED TV
Download  44 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3339 Fiches technique(HTML) 14 Page - STMicroelectronics

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AN3339
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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)


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