LM3595LDEV

OBSOLETE User's Guide SNVA068B – May 2004 – Revised April 2013 AN-1290 LM3595 Evaluation Board The LM3595 is a four-output parallel white LED driver capable of delivering 25mA per output when driven with a fixed input voltage. The input voltage range is 3V to 5.5V and the desired output current is set through the use of one external resistor. The LM3595 has functionality for both PWM and analog brightness control. For PWM control, a PWM signal must be applied to the EN pin. A 50% duty cycle will yield 50% of the set output current. Care must be take to make sure that the minimum on-time (TON = 50µs) is not exceeded. The following equations will ensure that minimum on-time is not violated: D × (1/f) > TON fMAX = DMIN ÷ TON (1) (2) For analog brightness control, the BR-ON pin must be driven high and a voltage from 0V to 3V on the BRGT pin will control the output current. The output current under normal operation is set using the following equation: Eq. 1 for BR-ON = 0V: RSET = 100 • (1.22V / IOUT) (3) When analog brightness control is used, the output current is set using the following equation: Eq. 2 for BR-ON = VIN: RSET = 100 • ((1.22V /IOUTx (MAX)) • (VBRGT (MAX) / 3V) (4) Present on the LM3595 evaluation board is a cathode connect jumper. Removing this jumper allow the output currents to be drawn through the corresponding output headers instead of through the diodes present on the board. Replacing the jumpers returns the board to normal operation. The LM3595 comes in TI's LLP-10 package. For more information, please refer to the LM3595 Parallel White-LED Driver (SNVS241) data sheet Table 1. Bill of Materials Designator U1 D1-4 CIN Description Manufacturer Model Number LM3595 Parallel White LED Driver Texas instruments LM3595 White LEDs Osram LWM67C Input Capacitor (1µF ceramic capacitor) TDK C1608X5R1A105K All trademarks are the property of their respective owners. SNVA068B – May 2004 – Revised April 2013 Submit Documentation Feedback AN-1290 LM3595 Evaluation Board Copyright © 2004–2013, Texas Instruments Incorporated 1 OBSOLETE www.ti.com LM3595 3.0V - 5.5V VIN EN BR-ON VIN OUT1 EN OUT2 BRGT OUT3 BR-ON OUT4 ISET GND, DAP R6(7¶ RSET CATHODE CONNECT Figure 1. LM3595 Application Board Diagram Figure 2. Typical Layout, Top Side 2 AN-1290 LM3595 Evaluation Board SNVA068B – May 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated OBSOLETE www.ti.com Figure 3. Typical Layout, Bottom Side Unmirrored SNVA068B – May 2004 – Revised April 2013 Submit Documentation Feedback AN-1290 LM3595 Evaluation Board Copyright © 2004–2013, 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. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. 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