LM3552SDEV

User's Guide SNVA174A – September 2006 – Revised April 2013 AN-1495 LM3552 White LED Flash Driver Evaluation Board 1 Introduction To operate the LM3552 White LED Flash Driver Evaluation Board, connect a supply voltage (2.7V to 5.5V) between board connectors VIN and GND. 2 Board Operation: Basic Connections To operate the LM3552 White LED Flash Driver Evaluation Board, connect a supply voltage (2.7V to 5.5V) between board connectors VIN and GND. Default Jumper Connections: • EN: Connects the “OFF” post to the middle post of the EN header strip. This connects GND to the EN pin of the LM3552, disabling the part. • T/F: Connects the “T” post to the middle post of the T/F header strip. This connects GND to the T/F pin of the LM3552, placing the part into the 200mA torch mode when the part is enabled When these connections are all made correctly, the Flash LED will be OFF. Setting the EN jumper to the ON position will enable the part and turn on the flash LED. In torch mode, the LED current will be set to approximately 200mA. Placing the T/F jumper across the '+' pin and the T/F pin enables flash mode. The total current delivered to the LED is approximately 700mA. If this jumper is left in flash mode, the internal time-out circuit will disable the switcher after approximately 1 second. The EN pin has an internal pull-down resistor placing the part in shutdown by default. The T/F pin does not have a pull-up or pull-down resistor. If left unconnected, it is unknown as to whether the LM3552 is in torch or flash mode. For more information regarding the operation of the LM3551/2, please refer to LM3551 /LM3552 1A White LED Driver with Flash Timeout Protection (SNVS371). All trademarks are the property of their respective owners. SNVA174A – September 2006 – Revised April 2013 Submit Documentation Feedback AN-1495 LM3552 White LED Flash Driver Evaluation Board Copyright © 2006–2013, Texas Instruments Incorporated 1 Schematic 3 www.ti.com Schematic L1 D1 SW + VBAT OVP VIN - CIN FB COUT VC RC RT LM3552 FTO RF FET-T CFTO FET-F CC SS GND VIN GND EN 4 2 T/F Bill of Materials Component Symbol Value Package Dimensions (mm) Temperature Characteristic LM3552 -- NHL0014B WSON14 4.0 × 4.0 × 0.8 LED L1 Flash LED -- 4.7µH -- CIN 10µF, 10V 0805 COUT 10µF, 16V 1206 CC 4.7nF 0805 CFTO 1uF, 10V 0603 Manufacturer Part # -- Texas Instruments LM3552 2.04 × 1.64 × 0.7 -- Lumileds LXCL-PWF1 4.5 × 4.7 × 1.4 -- TDK VLF5014AT-4R7M1R1 2.0 × 1.25 × 1.45 X5R TDK C2012X5R1A106K 3.2 × 1.6 × 1.9 X7R TDK C3216X7R1C106M 2.0 × 1.25 × 1.45 C0G TDK C2012C0G1H472J 1.6 × 0.8 × 0.9 X5R TDK C1608X5R1A105 CSS 0.1µF 0603 1.6 × 0.8 × 0.9 X7R TDK C1608X7R1E104 D1 1A, 20V SOD-123 3.6 × 1.65 × 0.95 -- ON Semiconductor MBR120VLSFT1 RC 10kΩ 0805 2.0 × 1.25 × 0.45 -- Vishay Dale CRCW08051002F RT 5.6Ω, 1/2W 2010 5.0 × 2.5 × 0.6 -- Panasonic ERJ-12ZYJ5R6U RF 2.2Ω, 1/2W 2010 5.0 × 2.5 × 0.6 -- Panasonic ERJ-12ZYJ2R2U AN-1495 LM3552 White LED Flash Driver Evaluation Board SNVA174A – September 2006 – Revised April 2013 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated LM3552 White LED Flash Driver Evaluation Board Layout www.ti.com 5 LM3552 White LED Flash Driver Evaluation Board Layout Figure 1. Top Layer Figure 2. Bottom Layer (unmirrored) SNVA174A – September 2006 – Revised April 2013 Submit Documentation Feedback AN-1495 LM3552 White LED Flash Driver Evaluation Board Copyright © 2006–2013, Texas Instruments Incorporated 3 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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