Texas Instruments TPS92512EVM-001 Manuale utente

User's Guide

SLVUAC9A–February 2015–Revised July 2015

TPS92512EVM-001 High-Current Buck Regulator With

Analog and PWM Dimming for High Brightness LEDs

1 Introduction

The TPS92512EVM-001 evaluation module (EVM) helps designers evaluate the operation and

performance of the TPS92512HV buck switching regulator designed for high-current LED-drive

applications. The TPS92512HV device is designed to control the drive of high-brightness light emitting

diodes and features a wide input voltage range (4.5 V to 60 V), PWM dimming capability, analog dimming

capability, adjustable/syncable switching frequency, and input undervoltage protection.

2 Warnings

Observe the following precautions when using the TPS92512EVM-001.

WARNING

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 Group1 [RG1]). See

IEC32471-1 ed1.0:2009-08 for risk group definitions.

3 Description

The TPS92512EVM-001 provides a high-brightness LED driver based on the TPS92512HV buck

regulator. It is designed to operate with an input voltage in the range of 12 V to 48 V. The EVM is set up

for a default output current of 1.5 A for an LED stack between approximately 5 V and 25 V. The

TPS92512 device helps provide high efficiency, good line regulation, low output ripple, and a wide

dimming range.

3.1 Typical Applications

This converter design describes an application of the TPS92512HV device as an LED driver with the

specifications described in Table 1. For applications with a different input voltage range or different output

voltage range refer to the TPS92512 data sheet.

SLVUAC9A–February 2015–Revised July 2015 TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM

Dimming for High Brightness LEDs

Description

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3.2 Features

3.2.1 Connector Description

This section describes the connectors and test points on the EVM and how to properly connect, setup,

and use the TPS92512EVM-001.

3.2.1.1 J1, LED+, LED-

The screw-down connector, J1, and the test posts marked LED+ and LED- are for connecting the LED

load to the board. The leads to the LED load should be twisted and kept as short as possible to minimize

voltage drop, inductance, and EMI transmission. This design is for approximately 2 to 7 white LEDs.

3.2.1.2 J2, VIN, GND

The screw-down connector, J2, and the test posts marked VIN and GND are for connecting the EVM to

the DC input voltage supply. The input supply ground should be connected to J2 or the GND test post

directly next to J2. One other GND test point is provided on the board that can also be used for all

purposes but input power.

3.2.1.3 UVLO

The test point UVLO connects directly to the UVLO pin of the TPS92512 device. The voltage range is 0 V

to 4.5 V if driven externally. The UVLO resistor divider should be used for the UVLO function, but the

UVLO voltage can be monitored with this test point. Pulling UVLO to GND will also serve to disable the

part and put it into low power shutdown mode.

3.2.1.4 PDIM

The PDIM test point connects directly to the PDIM pin of the TPS92512 device. Leave open for normal

operation. If PWM dimming is used, apply a square wave with a low level of GND and a high level of

between 2 V and 4.5 V. The dimming frequency range is 100 Hz to 1 kHz.

3.2.1.5 SYNC

The SYNC test point is AC coupled to the RT/CLK pin of the TPS92512 device through a 4.02-kΩresistor

in series with a 470-pF capacitor. Apply a square wave with a low level of GND and a high level of 3.3 V

to synchronize the switching frequency to the applied frequency. The frequency range of SYNC is 200 kHz

to 2 MHz.

3.2.1.6 IADJ

The IADJ test point connects directly to the IADJ pin of the TPS92512 device. The default is pulled high

through a 10M resistor to VIN resulting in an ISENSE voltage of 300mV. The range on the IADJ pin is 180

mV to 1.8 V and the corresponding ISENSE voltage is VIADJ / 6.

3.2.1.7 PH

A large via, labelled PH, is included and sized specifically to receive the probe tip of a standard 10x probe.

Use this via to monitor the switching waveform at the PH pin of the device.

2TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM SLVUAC9A–February 2015–Revised July 2015

Dimming for High Brightness LEDs Submit Documentation Feedback

VIN

0.01µF

UVLO

GND

4.02k

470pF

1.00k

0.1µF

LED-

LED+

PDIM

0.01µF

IADJ

SYNC

10.0M

1.00k

20.5k

174k

191k

0.1µF

VIN=12VDC - 48VDC

VOUT= 5 - 25V , 1.5A

33µH

CAUTION HOT SURFACE

BOOT 1

VIN

UVLO

PDIM

RT/CLK

IADJ

ISENSE 7

COMP

GND 9

PH 10

PAD 11

TPS92512HV

4.7µF

0.2

GND

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Electrical Performance Specifications

4 Electrical Performance Specifications

Table 1. TPS92512EVM-001 Electrical Performance Specifications

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

INPUT CHARACTERISTICS

Voltage range 12 48 V

Maximum input current 1.5 A

Input UVLO setting 11.5 V

OUTPUT CHARACTERISTICS

Output voltage, VOUT LED+ to LED- 5 25 V

Output current 1.425 1.5 1.575 A

Output current ripple 20 mApp

Analog dimming range IADJ = 180 mV to 1.8 V 10:1

PWM dimming range 250-Hz PWM 100:1

SYSTEMS CHARACTERISTICS

Efficiency Input voltage = 24 V, 4 LEDs 93%

Switching frequency 570 kHz

5 Schematic

Figure 1. TPS92512EVM-001 Schematic

SLVUAC9A–February 2015–Revised July 2015 TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM

Dimming for High Brightness LEDs

1.45

1.46

1.47

1.48

1.49

1.5

1.51

1.52

1.53

10 15 20 25 30 35 40 45

LED Current (A)

Input Voltage (V)

C002

100

10 15 20 25 30 35 40 45

Efficiency (%)

Input Voltage (V)

C001

Performance Data and Typical Characteristic Curves

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6 Performance Data and Typical Characteristic Curves

Figure 2 through Figure 8 show the typical performance curves for the TPS92512EVM-001. Unless

otherwise noted, VIN = 24 V and 3 LED output.

6.1 Efficiency

Top = 7 LEDs Middle = 4 LEDs Bottom = 2 LEDs

Figure 2. Efficiency vs Input Voltage

6.2 Line Regulation

Figure 3. Output Current vs Input Voltage

4TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM SLVUAC9A–February 2015–Revised July 2015

Dimming for High Brightness LEDs Submit Documentation Feedback

0.2

0.4

0.6

0.8

1.2

1.4

1.6

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

LED Current (A)

IADJ Voltage (V)

C003

0.2

0.4

0.6

0.8

1.2

1.4

1.6

0 10 20 30 40 50 60 70 80 90 100

LED Current (A)

PDIM Duty Cycle (%)

C004

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Performance Data and Typical Characteristic Curves

6.3 PWM Dimming

Figure 4. Output Current vs PWM Duty Cycle (250Hz)

6.4 Analog Dimming

Figure 5. Output Current vs IADJ Voltage

SLVUAC9A–February 2015–Revised July 2015 TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM

Dimming for High Brightness LEDs

Performance Data and Typical Characteristic Curves

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6.5 PWM Dimming Waveforms

Top = PDIM Bottom = LED Current

Figure 6. 1% Duty Cycle, 250-Hz PWM Dimming

Top = PDIM Bottom = LED Current

Figure 7. 50% Duty Cycle, 250-Hz PWM Dimming

6TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM SLVUAC9A–February 2015–Revised July 2015

Dimming for High Brightness LEDs Submit Documentation Feedback

www.ti.com

Performance Data and Typical Characteristic Curves

Top = PDIM Bottom = LED Current

Figure 8. 99% Duty Cycle, 250-Hz PWM Dimming

SLVUAC9A–February 2015–Revised July 2015 TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM

Dimming for High Brightness LEDs

TPS92512EVM-001 PCB layout

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7 TPS92512EVM-001 PCB layout

Figure 9 and Figure 10 show the design of the TPS92512EVM-001 printed circuit board.

Figure 9. Top Layer and Top Overlay (Top View)

Figure 10. Bottom Layer and Bottom Overlay (Bottom View)

8TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM SLVUAC9A–February 2015–Revised July 2015

Dimming for High Brightness LEDs Submit Documentation Feedback

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Bill of Materials

8 Bill of Materials

Table 2 lists the TPS92512EVM-001 components list according to the schematic shown in Figure 1.

Table 2. Bill of Materials

REFERENCE QTY VALUE DESCRIPTION SIZE PART NUMBER MFR

DESIGNATOR

C1 1 0.1 µF CAP, CERM, 0.1 µF, 25 V, ±10%, X5R 0603 885012206071 Wurth

C2, C4, C9 3 4.7 µF CAP, CERM, 4.7 µF, 100 V, ± 10%, X7S 1210 C3225X7S2A475K200AB TDK

C3, C6 2 0.01 µF CAP, CERM, 0.01 µF, 100 V, ±10%, X7R 0603 06031C103KAT2A AVX

C5 1 4.7 µF CAP, CERM, 4.7 µF, 25 V, ± 10%, X7R 1206 885012208068 Wurth

C7 1 0.1 µF CAP, CERM, 0.1 µF, 50 V, ± 10%, X7R 0603 885012206095 Wurth

C8 1 470 pF CAP, CERM, 470 pF, 50 V, ±10%, X7R 0603 885012206081 Wurth

D1 1 800 mV at 500 mA DIODE SCHOTTKY 80 V 0.5 A SOD-123 MBR0580-TP Micro Commercial Co

D2 1 850 mV at 2 A DIODE SCHOTTKY 80 V 2 A DO-214AC, SMA CDBA280-G Comchip Technology

L1 1 33 µH Inductor, Shielded Drum Core, Ferrite, 33 1246 744771133 Wurth

µH

J1, J2 2 Connector, rising clamp, 2 pins, 5mm 691123710002 Wurth

pitch

R1, R4 1 1 kΩRES, 1 kΩ, 1%, 0.1W 0603 CRCW06031K00FKEA Vishay-Dale

R2 1 10 MΩRES, 10 MΩ, 1%, 0.1 W 0603 CRCW060310M0FKEA Vishay-Dale

R3 1 174 kΩRES, 174 kΩ, 1%, 0.1 W 0603 CRCW0603174KFKEA Vishay-Dale

R5 1 191 kΩRES, 191 kΩ, 1%, 0.1 W 0603 CRCW0603191KFKEA Vishay-Dale

R6 1 4.02 kΩRES, 4.02 kΩ, 1%, 0.1W 0603 CRCW06034K02FKEA Vishay-Dale

R7 1 20.5 kΩRES, 20.5 kΩ, 1%, 0.1 W 0603 CRCW060320K5FKEA Vishay-Dale

R8 1 0.2 RES, 0.2, 1%, 1 W 2010 CSRN2010FKR200 Stackpole Electronics Inc

U1 1 TPS92512 2.5A Buck Current Regulator DGQ0010D TPS92512HV Texas Instruments

for High-Brightness LEDs with Integrated

Analog Current Adjust

SLVUAC9A–February 2015–Revised July 2015 TPS92512EVM-001 High-Current Buck Regulator With Analog and PWM

Dimming for High Brightness LEDs

Revision History

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Revision History

Changes from Original (February 2015) to A Revision .................................................................................................. Page

• Changed the PART NUMBER and MFR of C1, C5, C7, C8, and L1 in Table 2.................................................. 9

• Added J1, J2 to Table 2.................................................................................................................. 9

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

10 Revision History SLVUAC9A–February 2015–Revised July 2015

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