AN4376 datasheet(24/37 Pages) STMICROELECTRONICS

Part #	AN4376

Description	10 W wide range non-isolated high power factor LED driver using HVLED815PF

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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24 / 37 page

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AN4376

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DocID025380 Rev 1

7.2

Transition mode operation

During ON-time, the peak drain current is modulated by a signal proportional to the ILED

pin. This reference sets the turn-off of the MOSFET.

The MOSFET turn-on depends on the DMG signal that senses the demagnetization of the

drain current realizing a transition mode operation.

A primary inductance of 1.1 mH has been selected in order to obtain the converter switching

frequency into the interval [35 - 70] kHz (Magnetica PN-2267.0001).

Figure 22. Transition mode operation

at 100 VAC - 50 Hz

Figure 23. Transition mode operation

at 100 VAC - 50 Hz -zoom of signals

CH1: DRAIN

CH2: CS

CH3: ILED

CH4: DMG

CH1: DRAIN

CH2: CS

CH3: ILED

CH4: DMG

Figure 24. Transition mode operation

at 230 VAC - 50 Hz

Figure 25. Transition mode operation

at 230 VAC - 50 Hz - zoom of signals

CH1: DRAIN

CH2: CS

CH3: ILED

CH4: DMG

CH1: DRAIN

CH2: CS

CH3: ILED

CH4: DMG

AN4376 Datasheet(PDF) 24 Page - STMicroelectronics