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| Solved by SP7120/22 TM Evaluation Board Manual * * * * * * * * LED Driver for common cathode parallel connected LEDs Ultra Low Dropout Voltage of 150mV No EMI, no switching noise Integrated current matching PWM and Analog brightness control Enable/Shutdown control Shutdown current < 1A Small footprint SOT23-6 Package _______________________________________________________________ DESCRIPTION The SP712X driver's family provides a simple solution for a matched current source for any color common cathode LEDs. The common cathode connection allows the user to increase the led power dissipation by having the cathodes heat sinked to the ground plane of the circuit board. The SP7120 may drive two LEDs or one LED at twice the current with two channels connected in parallel. The factory preset current values of 15mA (version A), 20mA (version B), or 25mA (version C) per channel. The SP7122 has three channels with factory preset current values of 15, 20, or 25mA and may drive three LEDs or one LED at three-times the current with all channels connected in parallel. At shutdown mode (EN pin is LOW) the supply current drops to .04uA typical. The SP712x drivers are available in a small footprint 6-pin SOT23-6 package. __________________________________________________________ BOARD SCHEMATIC SP7120 Eval Board Schematic July19-07 SP7120-22 Evaluation Board Manual (c) 2007 Sipex Corporation SP7122 Eval Board Schematic _______________________________________________ USING THE EVALUATION BOARD 1) Powering Up the SP7120 or the SP7122 Circuit The Evaluation Board can be powered from inputs ranging from 2.7 to 5.5Vin. All that is required is to populate the LED location with desired LED and connect the source voltage to Vin and GND. There is a jumper located on the PCB. The jumper needs to be set between center pin and Vin to activate the part. If the jumper is left unpopulated the driver will be off due to the pull down resistor on the enable pin. For typical test results please refer to the data sheet. _________________________________________________ EVALUATION BOARD LAYOUT TOP Side SP7120 TOP Side SP7122 TOP Side SP7122 July9-07 TOP Side SP7122 (c) 2007 Sipex Corporation SP7120-22 Evaluation Board Manual Page - 2 - __________________________________________________________ BILL OF MATERIALS SP7120 QTY 1 2 1 1 1 3 1 Ref Desigantor U1 C1 R1 J1 Manufacturer Sipex Murata Vishay Wurth Wurth Millmax(DigiKey) Sipex Part Number SP7120*** GRM188R71H102KA01 CRCW060380K6FKEA 61303611121 60900213421 0300-11501-4727100 146-6643-01 Description 1nF Capacitor 80.6K Resistor 3 Pin 2.54 mm Header 2.54mm Jumper Test point pin PCB ***EACH PCB WILL HAVE A STICKER ON IT IDENTIFYING THE WHICH VERSION IC IS ON THE DEMO BOARD SP7122 QTY Ref Manufacturer Part Number Description Desigantor 1 U1 Sipex SP7122*** 2 C1 Murata GRM188R71H102KA01 1nF Capacitor 1 R1 Vishay CRCW060380K6FKEA 80.6K Resistor 1 J1 Wurth 61303611121 3 Pin 2.54 mm Header 1 Wurth 60900213421 2.54mm Jumper 3 Millmax(DigiKey) 0300-11501-4727100 Test point pin 1 Sipex 146-6645-00 PCB ***EACH PCB WILL HAVE A STICKER ON IT IDENTIFYING THE WHICH VERSION IC IS ON THE DEMO BOARD July9-07 SP7120-22 Evaluation Board Manual (c) 2007 Sipex Corporation Page - 3 - _____________________________________________________ ORDERING INFORMATION Part Number SP7120AEB SP7120BEB SP7120CEB SP7122AEB SP7122BEB SP7122CEB Description SP7120A 2 channel (15mA) Eval Board SP7120B 2 channel(20mA) Eval Board SP7120C 2 channel(25mA) Eval Board SP7122A 3 channel(15mA) Eval Board SP7122B 3 channel (20mA) Eval Board SP7122C 3 channel (25mA) Eval Board For further assistance: Email: WWW Support page: Sipex Application Notes: Sipexsupport@sipex.com http://www.sipex.com/content.aspx?p=support http://www.sipex.com/applicationNotes.aspx Solved by TM Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA95035 tel: (408) 934-7500 fax: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. July9-07 SP7120-22 Evaluation Board Manual (c) 2007 Sipex Corporation Page - 4 - |
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