Texas Instruments TPS92410EVM-001 Manuale utente
TPS92410EVM-001 Offline LED Driver
Evaluation Module
User's Guide
Literature Number: SLVUA49
April 2014
Contents
1 Introduction......................................................................................................................... 4
2 Warnings and Cautions ........................................................................................................ 4
3 Description.......................................................................................................................... 5
3.1 Typical Applications...................................................................................................... 5
3.2 Connector Descriptions ................................................................................................. 5
4 Electrical Performance Specifications .................................................................................... 6
5 TPS92410EVM-001 Schematic................................................................................................ 7
6 Performance Data and Typical Characteristic Curves............................................................... 8
6.1 Power Factor.............................................................................................................. 8
6.2 Line Regulation........................................................................................................... 8
6.3 Input Voltage and Input Current........................................................................................ 9
6.4 Linear Regulator Drain Voltage and Input Current................................................................... 9
6.5 Output Current .......................................................................................................... 10
6.6 Drain Overvoltage (DOV) Event (80-V Stack Shorted then Released).......................................... 10
6.7 Triac Dimming Waveforms ............................................................................................ 11
6.8 EMI Performance ....................................................................................................... 14
7 TPS92410EVM-001 PCB Layout............................................................................................ 15
8 Bill of Materials .................................................................................................................. 16
2Table of Contents SLVUA49–April 2014
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List of Figures
1 TPS92410EVM-001 Schematic............................................................................................ 7
2 Power Factor Versus Input Voltage ....................................................................................... 8
3 Input (Linear Regulator) Current Versus Input Voltage................................................................. 8
4 Input Voltage (Top) and Input Current (Bottom)......................................................................... 9
5 Drain Voltage (Top) and Input Current (Bottom)......................................................................... 9
6 80-V Stack (Top), 40-V Stack (Middle), and 20-V Stack (Bottom)................................................... 10
7 Drain Voltage (Top), DOV Pin Voltage (Middle), and Input Current (Bottom)...................................... 10
8 Forward Phase Triac Dimming: Rectified Input Voltage (Top) and Input Current (Bottom) – Full............... 11
9 Forward Phase Triac Dimming: Rectified Input Voltage (Top) and Input Current (Bottom) – Half .............. 11
10 Forward Phase Triac Dimming: Rectified Input Voltage (Top) and Input Current (Bottom) – Low.............. 12
11 Reverse Phase Dimming: Rectified Input Voltage (Top) and Input Current (Bottom) – Full ..................... 12
12 Reverse Phase Dimming: Rectified Input Voltage (Top) and Input Current (Bottom) – Half..................... 13
13 Reverse Phase Dimming: Rectified Input Voltage (Top) and Input Current (Bottom) – Low..................... 13
14 Conducted EMI Performance............................................................................................. 14
15 Top Layer and Top Overlay (Top View)................................................................................. 15
16 Bottom Layer and Bottom Overlay (Bottom View) ..................................................................... 15
List of Tables
1 TPS92410EVM-001 Electrical Performance Specifications............................................................ 6
2 TPS92410EVM-001 Bill of Materials..................................................................................... 16
3
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User's Guide
SLVUA49–April 2014
Switch Controlled Direct Drive Linear Controller for Offline
LED Drivers
1 Introduction
The TPS92410EVM-001 evaluation module (EVM) helps designers evaluate the operation and
performance of the TPS92410 direct drive linear controller designed for use with the TPS92411 in offline
LED-drive applications. The TPS92410 is designed to control the drive of high-brightness light emitting
diodes (LEDs) and features a wide input voltage range (9.5 V to 400 V), thermal foldback, analog dimming
capability, and linear FET overvoltage protection.
2 Warnings and Cautions
Observe the following precautions when using the TPS92410EVM-001.
WARNING
High Voltage
CAUTION
DO NOT STARE DIRECTLY INTO THE LED LIGHT SOURCE.
Intense light sources have a high secondary blinding effect. A temporary
reduction in visual acuity and afterimages can occur, leading to irritation,
annoyance, visual impairment, and even accidents – depending on the
situation. Always consider the use of light filtering and darkening protective
eyewear and be fully aware of surrounding laboratory type set-ups when
viewing intense light sources to minimize or eliminate such risks in order to
avoid accidents related to temporary blindness.
WARNING
Do not stare at the operating LED – (Risk Group 1
(RG1)). See IEC32471-1 ed1.0:2009-08 for risk group definitions.
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Description
3 Description
The TPS92410EVM-001 provides a high-brightness LED driver based on the TPS92410 in conjunction
with the TPS92411 direct drive switch. It is designed to operate with an input voltage in the range of 90
VAC to 135 VAC with a 120 VAC nominal input voltage. This input voltage range is typical for offline
applications. The EVM is set up for a default input current of 58 mA for 6.8 W total power and 3 LED
voltage stacks of 20 V, 40 V, and 80 V. The TPS92410 helps provide high efficacy, good power factor, low
THD, and flicker-free triac and phase dimming, due to its dimmer detect function that switches the input
current mode to a DC level.
3.1 Typical Applications
This converter design describes an application of the TPS92410 as an LED driver controller with the
specifications listed in Section 4. For applications with a different input voltage range or different output
voltage range, refer to the TPS92410 datasheet (SLUSBW9) and TPS92411 datasheet (SLUSBQ6).
3.2 Connector Descriptions
This section describes the connectors and test points on the EVM and how to properly connect, setup,
and use the TPS92410EVM-001.
3.2.1 J1
The screw down connector J1 is for the input voltage supply to the LED driver. The leads to the input
supply should be twisted and kept as short as possible to minimize voltage drop, inductance, and EMI
transmission. The input is not polarized. Line and neutral may be connected to either terminal.
3.2.2 VPx, VSx, ISx
The test points VP1, VS1, IS1, VP2, VS2, IS2, VP3, VS3, and IS3 are for testing the different LED stack
voltages and currents. For example, connect a voltmeter from VP1 to IS1 across the 1-Ωresistor, R1, to
measure the current in the top (80 V) LED string (1 mV = 1 mA). Connect a voltmeter from VP1 to VS1 to
measure the top stack voltage. The middle and lower stack currents and voltages can be measured in the
same way using the test points labeled with 2 and 3, respectively.
3.2.3 ADIM
The test point ADIM connects directly to the ADIM pin of the TPS92410. The voltage range is 0 V to 3 V.
Applying a voltage between 1.5 V and 3 V allows the internal reference to take over, resulting in a 1.5-V
reference at the CS pin. Applying a voltage below 1.5 V results in the applied voltage being the reference
at the CS pin down to 50 mV. Below 50 mV, the linear regulator is disabled and the GDL pin is pulled to
ground.
5
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Electrical Performance Specifications
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4 Electrical Performance Specifications
Table 1 contains the electrical performance specifications for the EVM.
Table 1. TPS92410EVM-001 Electrical Performance Specifications
Parameter Test Conditions MIN TYP MAX Units
Input Characteristics
Voltage range 90 120 135 VAC
Maximum input current 58 mA
Output Characteristics
Output voltage, VOUT Upper LED stack 80 V
Middle LED stack 40
Lower LED stack 20
Flicker Index 0.03
Output current ripple percent 12 %
Output current ripple Each stack 23 mApp
Overvoltage protection level Each individual TPS92410 100 V
Linear FET overvoltage protection 51 V
level
Systems Characteristics
Efficiency Input voltage = 120 VAC, No triac dimmer 79.5 %
Power factor Input voltage = 120 VAC, No triac dimmer 0.99
THD Input voltage = 120 VAC, No triac dimmer 7.5 %
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TPS92410EVM-001 Schematic
5 TPS92410EVM-001 Schematic
Figure 1 illustrates the TPS92410EVM-001 schematic.
Figure 1. TPS92410EVM-001 Schematic
7
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55
56
57
58
59
60
90 95 100 105 110 115 120 125 130 135
Input Current (mA)
Input Voltage (VAC)
C001
0.98
0.982
0.984
0.986
0.988
0.99
0.992
0.994
0.996
0.998
1
90 95 100 105 110 115 120 125 130 135
Power Factor
Input Voltage (VAC)
C002
Performance Data and Typical Characteristic Curves
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6 Performance Data and Typical Characteristic Curves
Figure 2 through Figure 13 present typical performance curves for the TPS92410EVM-001.
6.1 Power Factor
Figure 2. Power Factor Versus Input Voltage
6.2 Line Regulation
Figure 3. Input (Linear Regulator) Current Versus Input Voltage
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Performance Data and Typical Characteristic Curves
6.3 Input Voltage and Input Current
Figure 4. Input Voltage (Top) and Input Current (Bottom)
6.4 Linear Regulator Drain Voltage and Input Current
Figure 5. Drain Voltage (Top) and Input Current (Bottom)
9
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Performance Data and Typical Characteristic Curves
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6.5 Output Current
Figure 6. 80-V Stack (Top), 40-V Stack (Middle), and 20-V Stack (Bottom)
6.6 Drain Overvoltage (DOV) Event (80-V Stack Shorted then Released)
Figure 7. Drain Voltage (Top), DOV Pin Voltage (Middle), and Input Current (Bottom)
10 Switch Controlled Direct Drive Linear Controller for Offline LED Drivers SLVUA49–April 2014
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