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

SLVUA49–April 2014 List of Figures

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.

4Switch Controlled Direct Drive Linear Controller for Offline LED Drivers SLVUA49–April 2014

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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.

SLVUA49–April 2014 Switch Controlled Direct Drive Linear Controller for Offline LED Drivers

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

SLVUA49–April 2014 Switch Controlled Direct Drive Linear Controller for Offline LED Drivers

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

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)

SLVUA49–April 2014 Switch Controlled Direct Drive Linear Controller for Offline LED Drivers

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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