Data Sheet

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WLMDU9456001JT / 172946001

MagI

C Power Module

LDHM - LED Step Down High Current Module

4.5 - 60V / 450mA / 4.5 - 60V Output

We-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0

DESCRIPTION

The LDHM type of the MagI³C Power Module family

provides a fully integrated constant current LED driver

including the buck switching regulator and inductor in a

package.

The 172946001 offers high efficiency and delivers up to

450mA of LED current. It operates from 4.5V input

voltage up to 60V and supports up to 16 LEDs in series. It

is designed for fast PWM dimming for no color shift.

It is available in an innovative industrial high power

density TO263-7EP (10.16 x 13.77 x 4.57mm) package

that enhances thermal performance and allows for hand

or machine soldering.

The LDHM regulator has an on-board protection circuitry

to guard against thermal overstress and electrical

damage featuring thermal shut-down, input under-voltage

lockout and LED short-circuit protections.

TYPICAL APPLICATIONS

ƒ Indoor lighting: Spot light, down light

ƒ Outdoor lighting: Street light, security light, tunnel

light

ƒ Outdoor lighting: High-bay light, low-bay light

FEATURES

ƒ Peak efficiency up to 95%

ƒ Default LED current: 350mA

ƒ Adjustable LED current up to 450mA

ƒ Current sharing in parallel operation for higher

output current

ƒ Wide input voltage range: 4.5V to 60V

ƒ Output voltage range: 4.5V to 60V

ƒ Maximum output power: 27W

ƒ PWM dimming / Analog dimming

ƒ Integrated shielded inductor

ƒ Single exposed pad for best-in-class thermal

performance

ƒ Typical LED Current Accuracy ±3.5 %

ƒ LED short circuit protections

ƒ Under voltage lockout Protection (UVLO)

ƒ Fixed switching frequency at 800kHz

ƒ Compatible with ceramic and Low ESR Capacitors

ƒ Operating ambient temp. range up to 85°C

ƒ Operating junction temp. range: -40 to 125°C

ƒ RoHS & REACH compliant

ƒ Mold compound UL 94 Class V0 (flammability

testing) certified

ƒ Complies with EN 55015 radiated emissions

standard

TYPICAL CIRCUIT DIAGRAM

LED+

DIM

PGND

ISET

IFIX

LED-

Module

AGND

LED+

IADJ

High Power LED String

OUT

Summary of content (35 pages)

PAGE 1
WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module 4.5 - 60V / 450mA / 4.5 - 60V Output DESCRIPTION FEATURES The LDHM type of the MagI³C Power Module family provides a fully integrated constant current LED driver including the buck switching regulator and inductor in a package. ƒ ƒ ƒ ƒ The 172946001 offers high efficiency and delivers up to 450mA of LED current. It operates from 4.5V input voltage up to 60V and supports up to 16 LEDs in series.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module PACKAGE 2 DIM 3 AGND 4 6 1 LED+ 7 LED+ ISET 5 IFIX 6 LED- 7 YMLLLLG3 WE201 Exposed Pad = PGND Connect to AGND EP 6 Top view 7 Package marking MARKING DESCRIPTION Marking WE Y M LLLL G3 WE201 Description Würth Elektronik trade name Year Month Lot trace code Lead finish code per JEDEC norm (green 3 mat sin) Part identifier PIN DESCRIPTION SYMBOL PIN # TYPE PIN DESCRIPTION LED+ 1, 2 Power Sup
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module ORDERING INFORMATION ORDER CODE PART DESCRIPTION PACKAGE PACKING UNIT 172946001 WLMDU9456001JT TO263-7EP Tape and Reel with 250 Units 158998 Demonstration Board 1 178946001 Evaluation Board 1 SALES INFORMATION SALES CONTACTS Würth Elektronik eiSos GmbH & Co. KG EMC & Inductive Solutions Max-Eyth-Str. 1 74638 Waldenburg Germany Tel. +49 (0) 79 42 945 - 0 www.we-online.com powermodules@we-online.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module ABSOLUTE MAXIMUM RATINGS Caution: Exceeding the listed absolute maximum ratings may affect the device negatively and may cause permanent damage.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module ELECTRICAL SPECIFICATIONS MIN and MAX limits are valid for the recommended junction temperature range of -40°C to 125°C unless otherwise stated. Typical values represent statistically the utmost probability at following conditions: V IN=48V, ILED = 350 mA. VIN is the voltage applied across LED+ and GND. I IN is the input current flowing into the LED+ node. I LED is a LED current flowing into the LED- pin.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module TYPICAL PERFORMANCE CURVES If not otherwise specified, the following conditions apply: VIN = 48 V; CIN = 2.2 µF 100 V X7R ceramic capacitor for driving 5-13 power LEDs, ILED = 350 mA; Single LED forward voltage used is 3.2 V; TAMB = 25 °C Radiated Emissions EN55015 compliant: VIN = 60V; ILED = 350mA; CIN/COUT = 2.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module TYPICAL PERFORMANCE CURVES If not otherwise specified, the following conditions apply: VIN = 48 V; CIN = 2.2 µF 100 V X7R ceramic capacitor for driving 5-13 power LEDs, ILED = 350 mA; Single LED forward voltage used is 3.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module TYPICAL PERFORMANCE CURVES If not otherwise specified, the following conditions apply: VIN = 48 V; CIN = 2.2 µF 100 V X7R ceramic capacitor for driving 5-13 power LEDs, ILED = 350 mA; Single LED forward voltage used is 3.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module TYPICAL PERFORMANCE CURVES If not otherwise specified, the following conditions apply: VIN = 48 V; CIN = 2.2 µF 100 V X7R ceramic capacitor for driving 5-13 power LEDs, ILED = 350 mA; Single LED forward voltage used is 3.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module BLOCK DIAGRAM GND 4 47µH LED- 7 AGND Error Amplifier 5 ISET 6 3kΩ IFIX 1 Switch Control & Logic Vref Voltage Regulator VIN COUT Current mirror VCC 1 λF LED+ 2 LED+ 1.25V 0.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module DESIGN FLOW The next 4 simple steps will show how to select the external components to design your power application: Essential Steps 1. 2. 3. Set the LED driver module current Select the appropriate number of LEDs Layout and EMI considerations Optional Steps 4. 5. Dimming control Parallel operation 2. High Power LED String COUT 3. 1 VIN 2 LED+ LED+ LED- Module 5. CIN 4. DIM PGND EP We-online.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module DESIGN FLOW Step 1 Program the LED driver module current The LED driver module requires no external current sensing resistor for LED current regulation. If the default LED current of 350mA is desired, no external resistor is necessary.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module DESIGN FLOW High Power LED String COUT 1 VIN LED+ 2 LED+ LED- Module IFIX CIN 3 7 DIM ISET PGND EP 6 5 AGND 4 RIADJ Setup for full adjustable LED current According to equation (1) LED current values lower than 300mA can be also set. The minimum value of the LED current depends on the minimum current that keeps the device operating in CCM.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module DESIGN FLOW The picture below shows the minimum adjustable LED current according to the number of LEDs (forward voltage assumed 3,2V) and the input voltage.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module DESIGN FLOW Step 3 Layout and EMI considerations The overall performance of the LED driver module highly depends on the PCB layout. Poor board layout can disrupt the performance of the LED driver module and surrounding circuitry by contributing to EMI, ground bounce and resistive voltage drop in the traces. These can send incorrect signals to the LED driver module resulting in poor regulation and stability.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module DESIGN FLOW ∂ Place COUT (for reduction of LED current ripple and EMI compliance) as close as possible to the LED+ pin (pin 1+pin 2) and LED- pin (pin 7). Exposed pad PGND GND CIN1 CIN2 1 2 2 3 4 5 6 7 VIN LED+ DIM AGND ISET IFIX LED- Bottom GROUND PLANE We-online.com © May 2016 COUT1 COUT2 RIADJ Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module ∂ PGND exposed pad (EP) must be connected to the AGND pin (pin 4) directly. Exposed pad PGND GND CIN1 1 CIN2 2 2 3 4 5 6 7 VIN LED+ DIM AGND ISET IFIX LED- COUT1 COUT2 RIADJ Bottom GROUND PLANE From an EMI reduction standpoint, it is imperative to minimize the di/dt current paths (refer to LED driver module current loops). Therefore, it is recommended to connect an 2.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module The 172946001 could work properly also without any COUT. In this case the inductor ripple will be added to the LED current, as shown in the picture below.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module Step 4 Dimming Control Two ways to implement the LED dimming are offered: the analog dimming and the PWM dimming. Both methods control the average current flowing through the LEDs.
PAGE 20
WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module Example. In the following table two possible external voltage sources and the required resistors are shown. In both cases a LED current from 300mA to 450mA can be adjusted VADIM range [V] 0 to 3.3 0 to 5 RADIM [kΩ] 18.48 (18.7 closest value 1% series) 28.00 RIADJ [kΩ] 2.67 2.55 The picture below shows how the LED current varies according to the analog dimming voltage, using the above mentioned resistors.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module PWM Dimming Controlling the brightness of the LED emitted light while keeping the same color can be achieved by properly driving the LED. A well-known limitation of the human eye is not to distinguish light flickering with frequency above 100-120Hz. The idea of the PWM dimming of LEDs means simply switching on and off the LED above this frequency.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module The maximum frequency of the PWM dimming signal (f DIM,max) should not exceed, as rule of thumb,1/10 of the switching frequency: f = 800kHz ⇒ f , = 80kHz (5) The minimum dimming on-time pulse (t DIM,on_min) is around 16µs. The frequency of the dimming signal must be adjusted according to the required dimming contrast ratio (CR).
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module Example 2.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module Example 3. The schematic below shows a possible combination of analog and PWM dimming in order to set the color temperature of the emitted light and, at the same time, to adjust the brightness. High Power LED String CIN 1 VIN 2 LED+ LED+ LED- Module IFIX PWM signal CIN 3 DIM PGND BRIGHNTESS SETTING We-online.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module Step 5 Parallel operation When a load current higher than 450 mA is required by the application, LED driver modules can be used in parallel to deliver higher current. With common VIN and GND pins, each LED driver module will operate as independent asynchronous current source driving the same current.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module PROTECTIVE FEATURES Shorted LED protection Example 350mA 18V 15V 350mA 3V 3V 3V 3V 3V 3V 3V 3V LED shorted 3V 0V 3V 3V In case of a short circuit of one or more LEDs, the loop will react in order to adapt the voltage across the LED string, as shown in the picture below.
PAGE 27
WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module Similarly, in case the LED is only temporary shorted and then again normally working, the voltage across the LED string will be adapted accordingly. In any case the current through the LED string is not affected, keeping the programmed value.
PAGE 28
WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module APPLICATIONS The MagI³C LED driver module for constant current is easy-to-use for current solutions capable of driving up to a 450 mA load with exceptional power conversion efficiency. They are available in an innovative package that enhances thermal performance and allows for hand or machine soldering. Following application circuits show possible operating configurations.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module HANDLING RECOMMENDATIONS 1. 2. 3. 4. The power module is classified as MSL3 (JEDEC Moisture Sensitivity Level 3) and requires special handling due to moisture sensitivity (JEDEC J-STD033). The parts are delivered in a sealed bag (Moisture Barrier Bags = MBB) and should be processed within one year. When opening the moisture barrier bag check the Humidity Indicator Card (HIC) for color status.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module PHYSICAL DIMENSIONS (mm) Package Type: TO263-7 We-online.com © May 2016 Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module recommended soldering pad We-online.com © May 2016 recommended stencil design solder paste recommendation 150µm Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module PACKAGING Reel (mm) We-online.com © May 2016 Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module Tape (mm) We-online.com © May 2016 Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module DOCUMENT HISTORY Revision Date 1.0 May 2016 Description Comment Release of final version CAUTIONS AND WARNINGS The following conditions apply to all goods within the product series of MagI³C of Würth Elektronik eiSos GmbH & Co. KG: General: All recommendations according to the general technical specifications of the data-sheet have to be complied with.
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WLMDU9456001JT / 172946001 MagI3C Power Module LDHM - LED Step Down High Current Module IMPORTANT NOTES The following conditions apply to all goods within the product range of Würth Elektronik eiSos GmbH & Co. KG: 1. General Customer Responsibility Some goods within the product range of Würth Elektronik eiSos GmbH & Co. KG contain statements regarding general suitability for certain application areas.