XRP7613IDBTR-F

XRP7613 1.2A 36V Step Down High Brightness LED Driver November 2019 Rev. 1.2.1 GENERAL DESCRIPTION APPLICATIONS • General Lighting and Displays The XRP7613 is a non-synchronous step down converter with integrated FET optimized to drive high power LEDs at up to 1.2A of continuous current. A wide 7.0V to 36V input voltage range allows for single supply operations from industry standard 12V, 18V or 24V power rails. • Architectural and Accent Lighting • Medical and Industrial Instrumentation • Video Projectors FEATURES Based on a hysteretic PFM control scheme, the XRP7613 can operate at switching frequency of up to 1MHz and allows for small external components selection while providing very fast transient response and achieving excellent efficiency. The output current is programmable from 150mA to 1.2A through an external sense resistor. • 1.2A Continuous Output LED Current − 150mA to 1.2A Programmable Range • 7V to 36V Single Rail Input Voltage • PWM & Analog Dimming Capability − Up to 40kHz Frequency • LED Current Foldback Thermal Control Output current dimming is supported through an analog signal or PWM logic signal at up to 40kHz. A dynamic LED current thermal control further enhances the reliability of the end application by linearly reducing the LED current as temperature raises. − Selectable Automatic Linear Dimming of LED Current with temperature • Shutdown Control • Built-in Soft Start • Open LED, LED Short Circuit and Over Temperature Protections An open LED, LED short circuit, over temperature and under voltage lock out protection insures safe operations under abnormal operating conditions. • RoHS Compliant “Green”/Halogen Free 8-pin Exposed Pad SOIC Package The XRP7613 is offered in RoHS compliant, “green”/halogen free 8-pin Exposed Pad SOIC package. TYPICAL APPLICATION DIAGRAM Fig. 1: XRP7613 Application Diagrams 1/13 Rev. 1.2.1 XRP7613 1.2A 36V Step Down High Brightness LED Driver ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage Range VIN ...................................... 7V-36V Operating Temperature Range ................... -40°C to 85°C Thermal Resistance ...................................................... ϴJA1 ............................................................... 60°C/W ϴJC1 ............................................................... 15°C/W Input Voltage VIN .................................................... 40V ISEN Voltage ............................... (VIN+0.3V) to (VIN-5V) EN/DIM Voltage............................................ -0.3V to 5V Junction Temperature .......................................... 150°C Storage Temperature .............................. -65°C to 150°C Lead Temperature (Soldering, 10 sec) ................... 260°C ESD Rating (HBM - Human Body Model) .......................... All pins ................................................................ 2kV Note 1: Package is placed on 2-layer PCB with 2 ounces copper and 2 square inch, connected with 8 vias. ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Ambient Temperature of TJ = TA = 25°C only; limits applying over the full Operating Ambient Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided for reference purposes only. Unless otherwise indicated, VIN = 12V, L=47µH, 1 x LED and ILED=330mA and TA= 25°C. Parameter Min. Typ. Max. Units 0.5 1 mA Output switching EN/DIM floating, f=250kHz 35 45 µA Output not swithing EN/DIM 250𝑛𝑛𝑛𝑛 The maximum allowed PWM dimming frequency that can be applied is 40 KHz. The switch off time can be approximated from the following equation 𝑇𝑇𝑂𝑂𝑂𝑂𝑂𝑂 = 𝐿𝐿 × ∆𝐼𝐼𝐿𝐿 𝑉𝑉𝐿𝐿𝐿𝐿𝐿𝐿 + 𝑉𝑉𝐷𝐷 + 𝐼𝐼𝐿𝐿𝐿𝐿𝐿𝐿 × (𝑅𝑅𝑆𝑆𝑆𝑆𝑆𝑆 + 𝑅𝑅𝐿𝐿 ) Analog Dimming The average current delivered to the LED, ie the LED brightness, can also be controlled by applying a variable DC voltage signal to the EN/DIM pin. 𝑇𝑇𝑂𝑂𝑂𝑂𝑂𝑂(𝑀𝑀𝑀𝑀𝑀𝑀) > 350𝑛𝑛𝑛𝑛 where VIN is the input voltage VLED is the total LED forward voltage A DC voltage greater than 1.25V will drive output LED current to 100% of the LED current as set by the external sense resistor RSET while a voltage lower than 200mV will shutdown the XRP7613. When analog dimming is required, the DC voltage range of EN/DIM should be between 0.4V to 1.25V in order modulating the average current delivered to the LED accordingly. ILED is the LED average current RSET is current sense resistance RL is inductor resistance RDS(ON) is switch on resistance (0.5Ω typ.) L is the inductor value ΔIL is the inductor peak to peak current VD is diode forward voltage at the LED average current. 9/13 Rev. 1.2.1 XRP7613 1.2A 36V Step Down High Brightness LED Driver PROTECTIONS By setting RT=10KΩ and using a 103KT1608 thermistor, the voltage on the TH pin will reduce to 0.4V when the LED temperature reaches 70°C. The LED average current will be decreased linearly when VTH is between 0.4V and 0.28V. If the LED temperature is over 90°C, the voltage on the TH pin will reduce to 0.28V and the LED will be turned off in order to decrease the LED temperature. When the voltage on the TH pin rises to 0.3V, the LED will be turned on again. LED Open Circuit Protection Upon detection of an open-circuit on any LED connected to the XRP7613, the device will shut down. LED Short Circuit Protection Upon detecting a short-circuit on any LED connected to the XRP7613, the device will maintain the LED current as set by the external sense resistor RSET. If the LED thermal regulation function isn’t required, the TH pin should be connected directly to VREF pin to disable this function. UVLO Protection DIODE SELECTION The XRP7613 has an Under Voltage Lock-Out comparator to monitor the Input Voltage VIN. The VIN UVLO threshold is set internally: when VIN pin is greater than 6.0V the XRP7613 is permitted to start up pending the removal of all other faults. Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for any XRP7613 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses. A Schottky diode with a 2A current rating is adequate for most XRP7613 applications. LED Thermal Protection The XRP7613 includes a LED thermal regulation circuit to prevent an over temperature situation on the LED. When the LED temperature rises above a predefined threshold, the XRP7613 will reduce linearly the LED current from its nominal set value. INPUT CAPACITOR SELECTION Ceramic capacitors with their low ESR values and small size are ideal for the XRP7613 applications. When selecting an input capacitor, a low ESR capacitor is required to minimize the noise at the device input. It may be necessary to add an extra small value ceramic type capacitor in parallel with the input capacitor to prevent any possible ringing. Fig. 21: VTH Voltage The XRP7613 continuously monitors the LED temperature by measuring the voltage on its TH pin. The VTH voltage is created through a resistive network of a negative temperature coefficient (NTC) thermistor RTH and a fixed resistor RT between VREF pin and ground. INDUCTOR SELECTION Recommended inductor values for the XRP7613 are in the range of 22µH to 68 µH. The inductor selected should have low core losses and low DCR. 10/13 Rev. 1.2.1 XRP7613 1.2A 36V Step Down High Brightness LED Driver LAYOUT CONSIDERATION the 5.Effect from noise can be reduced by placing the XRP7613 GND pin as close as possible to the ground pin of the input bypass capacitor. 1.The input capacitor should be placed as close as possible to the VIN pin in order to reduce the input voltage ripple and noise. 6.The ISEN pin and VIN pin should be connected to the sense resistor directly. Traces should be routed away from any potential sources. For proper operations of XRP7613, following guidelines should be followed. 2.The inductor, internal power switch, Schottky diode, output capacitor and the LEDs should be kept as close as possible. 7.The VREF pin and TH pin should be connected to the LED thermal sense resistors directly. Traces should be routed away from any potential sources. 3.PCB traces with large current should be kept short and wide. TYPICAL APPLICATION CIRCUITS Fig. 22: Typical Application Diagram 11/13 Rev. 1.2.1 XRP7613 1.2A 36V Step Down High Brightness LED Driver MECHANICAL DIMENSIONS 8-PIN EXPOSED PAD SOIC 12/13 Rev. 1.2.1 XRP7613 1.2A 36V Step Down High Brightness LED Driver REVISION HISTORY Revision Date Description 1.0.0 11/09/2012 Initial Release of Datasheet 1.1.0 11/26/2012 Corrected typographical error L=47µH in Electrical Specification conditions. 1.2.0 12/10/2012 Added explanation to ‘hysteretic operation’ and ‘turn on and turn off delay time’. 1.2.1 11/01/2019 Updated to MaxLinear logo. Updated Ordering Information. CORPORATE HEADQUARTERS: 5966 La Place Court Suite 100 Carlsbad, CA 92008 Tel.: +1 (760) 692-0711 Fax: +1 (760) 444-8598 www.maxlinear.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Maxlinear, Inc. Maxlinear, Inc. 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Other company trademarks and product names appearing herein are the property of their respective owners. © 2012 - 2019 Maxlinear, Inc. All rights reserved. 13/13 Rev. 1.2.1