Datasheet

www.ti.com

Test Procedure

6 Test Procedure

6.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Connect EVM per Figure 2. An external LED load must be used to start up the EVM.

2. Prior to turning on the AC source, set the voltage to 180 V

RMS

3. Turn on the AC source.

4. Record the output voltage from Voltmeter 2 and output current reading from Ammeter 2 and input

current from Ammeter 1.

5. Increase output voltage by 5 V

RMS

6. Repeat steps 4 and 5 until 265 V

is reached.

7. Refer to Section 6.2 for shutdown procedure.

6.2 Equipment Shutdown

1. Turn off equipment.

2. Make sure Capacitoracitors are discharged.

6.3 EVM Phase Angle Decode vs LED Current

1. Connect EVM per Figure 2. An external LED load must be used to start up the EVM.

2. Prior to turning on the AC source, set the voltage to 230 VRMS.

3. Connect scope probe to EVM per Figure 2 to bridge rectifier output.

4. Turn on the AC source.

5. Record the output voltage from Voltmeter 2 and output current reading from Ammeter 2 and input

current from Ammeter 1.

6. Set dimmer to maximum setting and note the LED current.

7. Varry the dimmer from maximum to minimum setting and evaluate the dimming performance.

8. Refer to Section 6.2 for shutdown procedure.

NOTE: The scope must be isolated.

SLUUA02–AUGUST 2012 LM3447-PAR-230VEVM is a Phase-Dimmable, Primary-Side Regulated LED

Driver

Submit Documentation Feedback