LM3590MFEV

OBSOLETE User's Guide SNVA079A – July 2004 – Revised April 2013 AN-1306 LM3590 Evaluation Board 1 Introduction The Texas Instruments LM3590 Evaluation Board may be used to test and evaluate a typical LM3590 application circuit. The layout includes extra large pads for the input capacitor (CIN), current set resistor (RSET), and White LEDs (D1-D3) to simplify the changing of external components and accommodate different case sizes. Two post holes for leaded pin-sockets (RSET') are also included in the layout to enable the use of leaded resistors. The layout of the board is recommended as a guide for end-use board design. This Board has been pre-configured to deliver 20mA to 3 White LEDs connected in series. Minimum input voltage for this configuration is 11.3V. LED current is programmed by the RSET resistor, using the equation: RSET = 100(1.25V/IOUT). For more detail on the LM3590 features and specifications, see LM3590 Series White LED Driver (SNVS258). 2 Evaluation Board Schematic IOUT = 20 mA max VIN = 6V - 12.6V 4 CIN VIN 1 µF IOUT 3 D1 LM3590 EN 1 ISET GND D2 5 2 D3 Figure 1. Evaluation Board Schematic 3 Components 3.1 Integrated Circuit Part # Package Mark I.D. Package Dimensions Current Option LM3590 SABB SOT23-5 (MF05A) (L × W × H) 3.0mm × 3.0mm × 1.0mm 20mA All trademarks are the property of their respective owners. SNVA079A – July 2004 – Revised April 2013 Submit Documentation Feedback AN-1306 LM3590 Evaluation Board Copyright © 2004–2013, Texas Instruments Incorporated 1 OBSOLETE Device Description 3.2 3.3 4 www.ti.com Capacitors Capacitor Symbol Value Case Size U.S. (Metric) Height Temperature Characteristic Mfr. Part # CIN 1.0µF, 10V 0805 (2012) 1.25mm X7R TDK C2012X7R1C105K LED Symbol VF Case Size U.S. (Metric) Height Temperature Range Mfr. Part # D1–3 3.6V 2.1mm × 1.3mm 1.2mm −40°C to + 100°C OSRAM OSRAM LW M67C RSET 6.19kΩ 1206 (3216) 0.6mm VISHAY CRCW12066191F Miscellaneous Device Description The LM3590 is a White LED constant current driver capable of supplying up to 3 White LEDs connected in series with 20mA. This device operates over a wide 6V-12.6V input voltage range. The output can accommodate LEDs with a combined forward voltage of up to 11.5V, from a 12V input supply. LED drive current is programmed by using an external resistor on the ISET pin. Leaded sockets have been placed on the board to aid the changing of resistor values on ISET. The LM3590 is available in a small 5-pin SOT23 package. LED brightness can be linearly varied up to the programmed LED current by applying a Pulse Width Modulated (PWM) signal to the EN pin of the device. The LED output current of the LM3590 is tightly controlled over temperature and voltage. LED Current matching is assured due to the series configuration of the LEDs. The series topology also simplifies the connection between the White LEDs in the display module and the LM3590 since only one connection is required. 5 Input Connect the input and ground pins of the evaluation board to a power supply or battery with short, low impedance, low inductance wires or cables. The input voltage range of the LM3590 is 6.0V to 12.6V 6 ISET Pin An external resistor, RSET, connected to the ISET pin sets the output current. The current matching through each LED is guaranteed by the series LED drive topology. Use following equation to approximate and program the LED current: IOUT = 100 × (1.25V ÷ RSET) (Amps) 7 (1) Enable Mode A jumper is present on the evaluation board to bring the LM3590 in and out of shutdown. The LM3590 has an active-high enable pin (LOW = shut down, HIGH = operating). The LM3590 EN pin can be driven with a low-voltage CMOS logic signal (1.5V logic, 1.8V logic, and so on). There is an internal 500kΩ pull-down between the EN and GND pins of the LM3590. 2 AN-1306 LM3590 Evaluation Board SNVA079A – July 2004 – Revised April 2013 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated OBSOLETE Board Layers www.ti.com 8 Board Layers Figure 2. Top Layer, Top View Figure 3. Bottom Layer, Top View (unmirrored) SNVA079A – July 2004 – Revised April 2013 Submit Documentation Feedback AN-1306 LM3590 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. 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