AN3339 datasheet(25/44 Pages) STMICROELECTRONICS

Part #	AN3339

Description	185 W power supply with PFC and standby supply for LED TV

PDF	44 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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25 / 44 page

AN3339

Functional check

Doc ID 18449 Rev 2

25/44

Figure 47 and 48 show resonant behavior in the case of mains dip. The L6599A senses the

input voltage via the resistor divider connected to the LINE pin. As seen, it is dimensioned to

keep the resonant stage on in case of PFC output voltage drop caused by mains dip.

Figure 45.

OVP at full load and 115 Vac on 24 V

output

Figure 46.

OVP at full load and 115 Vac on 12 V

and 130 V outputs

CH3: 24 V output

CH1: LVG

CH2: PFC_gate

CH4: Vcc

CH3: 12 V output

CH1: 130 V output

CH2: VDD

CH4: Vcc

Figure 47.

Half cycle mains dip at full load and

115 Vac - 60 Hz

Figure 48.

Full cycle mains dip at full load and

115 Vac - 60 Hz

CH3: 24 V output

CH1: HB voltage

CH2: PFC_out

CH4: MAINS voltage

CH3: 24 V output

CH1: HB voltage

CH2: PFC_out

CH4: MAINS voltage

AN3339 Datasheet(PDF) 25 Page - STMicroelectronics