LM2758TLEV

User's Guide SNVA281A – April 2008 – Revised April 2013 AN-1695 LM2758 Flash LED Driver Evaluation Board 1 Schematic C1 1 PF C1 C2 1 PF - + C1 C2 - + C2 VIN CPOUT CIN 2.2 PF + - COUT 2.2 PF LM2758 EN1 LEDEN2 ISET PGND SGND RSET 2 Bill of Materials (BOM) Table 1. Bill of Materials (BOM) Manufacturer Part No Description Designation Quantity Texas Instruments LM2758 Flash LED Driver U1 1 TDK C1608X5R0J225 Ceramic cap, 2.2 µF, 6.3V, 0603 CIN, COUT 2 TDK C1608X5R0J105 Ceramic cap, 1.0 µF, 6.3V, 0603 C1, C2 2 Luxeon LXCL-PWF3 Flash LED LED 1 Vishay CRCW06032002F Res, 20 kΩ R1 1 Tycol/Amp 4–103239–0–03 1 x 3, 0.1” header EN1. EN2 2 Keystone Electronics 1573–2 Turret, DBL.0.82”L, .072 dia. VIN GND, GND, Vb, VOUT, LED-K, LED-A 7 Johnson Components 108–0902–001 Banana Jack, Insulated, Red VIN 1 Johnson Components 108–0903–001 Banana Jack, Insulated, Black GND 1 SNVA281A – April 2008 – Revised April 2013 Submit Documentation Feedback AN-1695 LM2758 Flash LED Driver Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 1 LM2758 Flash LED Driver Evaluation Board Layout 3 www.ti.com LM2758 Flash LED Driver Evaluation Board Layout Figure 1. Top Layer 2 AN-1695 LM2758 Flash LED Driver Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated SNVA281A – April 2008 – Revised April 2013 Submit Documentation Feedback www.ti.com LM2758 Flash LED Driver Evaluation Board Layout Figure 2. Bottom Layer SNVA281A – April 2008 – Revised April 2013 Submit Documentation Feedback AN-1695 LM2758 Flash LED Driver Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated 3 LM2758 Flash LED Driver Evaluation Board 4 LM2758 Flash LED Driver Evaluation Board 4.1 Startup Sequence www.ti.com Applying power to the VIN and EN pins at the same time cause the LM2758 to start up in an unknown state. For this reason, it is not advised to apply power to the device while the EN jumper blocks is set to the “ON” position. To startup the evaluation board, set the EN1 jumper and EN2 jumper to the “OFF” position, apply power to the board, and then move the EN jumper(s) to the “ON” position. This is the expected start-up operation in the typical application where VIN is tied to a voltage rail and the EN pins are controlled via logic signal. 4.2 EN1 EN2 Mode 0 0 Shutdown 1 0 Indicator 0 1 Torch 1 1 Flash Gain Transition Gain modes are designed to transition to the next higher gain when needed. The gain mode will stay in that higher gain until the Shutdown mode is cycled, resetting the gain to the lowest level. To reset the part to the minimum gain on the evaluation board, place the EN1 jumper and EN2 jumper to the “OFF” position, then to the “ON” position according to the Truth Table to the desired mode. 4.3 Input and Output Filters Ferrite beads along with ceramic capacitors could be used at the input and output pin to filter out switching noise. For detailed operating descriptions, see the LM2758 Switched Capacitor Flash LED Driver in DSBGA Data Sheet (SNVS551). 4 AN-1695 LM2758 Flash LED Driver Evaluation Board Copyright © 2008–2013, Texas Instruments Incorporated SNVA281A – April 2008 – Revised April 2013 Submit Documentation Feedback 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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