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SP7619/19A
TM
Evaluation Board Manual
* * * * * * * * * * Very low dropout voltage: 100mV Accurate current regulation down to dropout voltage No external components Output current 2 levels selectable Power-saving shutdown mode of 12nA typical PWM brightness control Fast turn-on (<50S) Time Out function to protect the LED Thermal Shutdown Protection Space saving 2mm x 3mm 8 pin DFN package
The SP7619 Evaluation Board is designed to help the user evaluate the performance of the SP7619 for use as a single LED Driver. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP7619 inputs and outputs so that the user can quickly connect and measure electrical characteristics and waveforms. The Evaluation Board schematic diagram is shown at Figure 1. DESCRIPTION AND BOARD SCHEMATIC
Figure 1.The SP7619 Evaluation Board Schematic Diagram *Note: While high current time duration is limited by the SP7619 in the range from 2 to 7s, we don't recommend pushing the button for a long time to prevent LED damage and battery discharge. LEDs provide very bright light at 0.5/0.7A output current. Protect your eyes.
Dec 7-06
SP7619 Evaluation Board Manual Page 1 of 4
(c) 2006 Sipex Corporation
INTRODUCTION The SP7619 is a linear low side constant current driver designed to source two preset currents of 200mA/500mA (SP7619), 200mA/700mA (SP7619A)*. The preset currents can be set by selecting THE CTRL pin to high or low. Dimming or shutdown can be done by feeding a PWM signal to the EN pin. Fast EN turn-on/off time allows for very fast PWM dimming frequencies, completely eliminating flicker. The driver acts as a current source ensuring constant LED current for a range of input voltage. The SP7619 allows for customer implementation of the lowest cost LED driver for a variety of applications. Internal circuitry maintains the preset constant current output for a wide voltage range at the LED input. The builtin thermal protection automatically stops LED current to prevent overheating. A timeout function serves as a fail safe, shutting down the output for currents greater than 266mA after 4 seconds of continuous operation if the enable input is not cycled. Capacitor C1 is a decoupling capacitor. Resistor R1 is used to hold the device in a Sleep Mode at power on if the ENABLE pin isn't connected to Vin voltage. The SP7619 devices don't have internal pullup/down resistors at the EN input and should be connected either to Vin or Ground. If the EN pin isn't used for modulation, it may be connected to Vin voltage directly using switch S1. Push button S2 is used to set LED current. Low output current is set by default using resistor R2. To set high output current value, connect the CTRL pin to Vcc (push button). USING THE EVALUATION BOARD 1) Powering Up the SP7619 Circuit The SP7619 Evaluation Board can be powered from a 4.5V power supply or from 3 alkaline cells. Connect the 4.5V source pin with a short lead directly to the "Vin" and -4.5V /GND pin to the "GND" posts. Connect the ENABLE pin to Vin voltage using shunt S1 (ON position). 2) Selecting the output current The LED current may be set at 500 (700) mA by connecting the CTRL pin to the Vin voltage (push button S2) or at 200 mA by connecting it to the ground (by default) respectively.* The device provides high output current for 4 seconds only after setting the CTRL pin HIGH to protect the LED. After that the device will go into shutdown mode. Set the ENABLE pin LOW (switch S1 in position OFF) and then after that set it HIGH (S1 position ON) to start the device again. 3) Dimming The SP7619 can be pulse width modulated using the EN pin. Set switch S1 in the OFF position. Connect the EN pin to the pulse generator with desired modulation frequency (positive pulse with amplitude from 2.4 to Vin voltage range). Changing the pulse duty cycle changes the average LED current. Recommended modulation frequencies are from 100Hz to 2kHz with 10 - 90% duty cycle.
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Contact Factory for additional current options.
Dec 7-06
SP7619 Evaluation Board Manual Page 2 of 4
(c) 2006 Sipex Corporation
EVALUATION BOARD LAYOUT
Figure 2. SP7619 Evaluation Board Layout top and bottom side
Reference C1 D1 R1, R2 S1 S2 U1
Quantity 1 1 2 1 1 1
Value 10nF 10% 100k 1%
Type 06033D103KAT2 LXCL-PWF1 M11251041%P5 42375-22-28-4033 or EG2209 7914G-1-000E SP7619ER
Manufacturer AVX Lumileds Vishay Molex E-Switch Switch Key Sipex
Table2. SP7619EB List of Materials
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SP7619 Evaluation Board Manual Page 3 of 4
(c) 2006 Sipex Corporation
ORDERING INFORMATION Model Temperature Range Package Type
SP7619EB............................................. -40C to +85C..................................... SP7619 Evaluation Board SP7619ER-L ....................................... -40 to +85 .....................Lead Free 8 Pin DFN (2mm x 3mm) C C SP7619ER-L/TR ................................ -40 to +85 C .....................Lead Free 8 Pin DFN (2mm x 3mm) C SP7619AER-L...................................... -40 to +85 C .....................Lead Free 8 Pin DFN (2mm x 3mm) C SP7619AER-L/TR ............................... -40 to +85 C .....................Lead Free 8 Pin DFN (2mm x 3mm) C /TR = Tape and Reel Pack quantity is 3,000 for DFN.
For further assistance: Email: WWW Support page: Live Technical Chat: Sipex Application Notes: Sipexsupport@sipex.com http://www.sipex.com/content.aspx?p=support http://www.geolink-group.com/sipex/ http://www.sipex.com/applicationNotes.aspx
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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.
Dec 7-06
SP7619 Evaluation Board Manual Page 4 of 4
(c) 2006 Sipex Corporation

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