Datasheet
Table Of Contents
- Using the LM3447-A19-120VEVM
- 1 Introduction
- 2 Description
- 3 Electrical Performance Specifications
- 4 Schematic
- 5 Test Setup
- 6 Test Procedure
- 7 Performance Data and Typical Characteristic Curves
- 7.1 Efficiency
- 7.2 Power Factor
- 7.3 Line Regulation
- 7.4 Input Current THD
- 7.5 Output Ripple
- 7.6 Switch Node Voltage Valley Switching
- 7.7 Triac Dimmer LED Current vs Conduction Angle
- 7.8 Turn-On Angle vs Input Power
- 7.9 Input/Output Current and Line Voltage Waveforms vs. Dimmer Setting
- 7.10 Current Sense Waveform
- 7.11 LED Open and Short Circuit Waveforms
- 7.12 EMI Plot
- 7.13 Transformer Specification
- 8 EVM Assembly Drawing and PCB Layout
- 9 List of Materials
- Important Notices
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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
RMS
.
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
RMS
.
6. Repeat steps 4 and 5 until 135 V
AC
is reached.
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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