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Test Procedure

6

Test Procedure

6.1

Line/Load Regulation and Efficiency Measurement Procedure

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

2. Prior to turning on the AC source, set the voltage to 90 V

3. Turn on the AC source.

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

Ammeter 2 and input voltage reading from Voltmeter 1 and current from Ammeter 1.

5. Increase output voltage by 5 V

6. Repeat steps 4 and 5 until 135 V

7. Refer to Section 6.2 for shutdown procedure.

6.2

Equipment Shutdown

1. Turn off equipment.

2. Make sure capacitors are discharged.

6.3

EVM Phase Angle Decode vs LED Current

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

2. Prior to turning on the AC source, set the voltage to 120 VRMS.

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

4. Turn on the AC source.

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

Ammeter 2 and input voltage reading from Voltmeter 1 and current from Ammeter 1.

6. Set dimmer to minimum setting and vary by 1.0 msec till 8 msec is reached and record in 5 above.

7. Refer to Section 6.2 for shutdown procedure.

NOTE:

Scope must be isolated.

7

SLUU937 – May 2012

LM3447-A19-120VEVM is a Phase-Dimmable, Primary-Side Regulated LED

Driver

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