AN2708 datasheet(38/42 Pages) STMICROELECTRONICS

Part #	AN2708

Description	2X36 W digital dimmable ballast with L6574 and ST7FDALI

PDF	42 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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38 / 42 page

DALI master AC-DC adapter

AN2708

38/42

There is no overshoot on the output voltages and the measured wakeup time is 180 mS.

5.3.3

Dynamic load tests

These tests show the transient load response at 110 Vac and 230 Vac mains when the 20 V

output current is increased from 10% to 90% of the maximum value.

In the worst case the result is 224 mV or 1.12% of dynamic load regulation which indicates a

very good dynamic behavior.

Figure 33.

Startup waveforms at minimum

load at 110 Vac - 60 Hz

Figure 34.

Startup waveforms at minimum

load at 230 Vac - 50 Hz

CH1 (blue): drain voltage

CH2 (red): 5 Vout

CH3 (green): 20 Vout

CH4 (purple): drain current

CH1 (blue): drain voltage

CH2 (red): 5 Vout

CH3 (green): 20 Vout

CH4 (purple): drain current

Figure 35.

Dynamic load waveforms

at 110 Vac - 60 Hz

Figure 36.

Dynamic load waveforms

at 230 Vac - 50 Hz

CH3 (green): 20 Vout voltage ripple

CH4 (purple): 20 Vout current

CH3 (green): 20 Vout voltage ripple

CH4 (purple): 20 Vout current

AN2708 Datasheet(PDF) 38 Page - STMicroelectronics