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SP7618ER-L Datasheet(PDF) 3 Page - Sipex Corporation |
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SP7618ER-L Datasheet(HTML) 3 Page - Sipex Corporation |
3 / 10 page 3 Date: Dec 5-06 Rev E Constant Current LED Driver © 2006 Sipex Corporation BLOCK DIAGRAM Vcc must be always higher than LED pin voltage (Vled) After 4s at current higher than 266 mA Power MOSFET leakage current Three initial Iled current steps are higher than other 28 Iled Variations from specified Iled value Iled Variations per volt Vcc change Iled Variations at Vled change from to 2.5V 5% change of ILED compared with ILED value at Vled = V Iled = 00 mA settles 50µs later after 3rd pulse Logic HIGH level should never exceed Vcc voltage Delay between applying Vcc voltage and operating condition PIN ASSIGNMENTS Pin # Pin Name Pin Function - 2 LED LED Current Sink. Connect LED cathode to this pin. Voltage at this pin should be above 00 mV to maintain regulation. 3 Vcc Power Supply Input. Place µF decoupling capacitor next to this pin. 4 EN Enable/Shutdown pin used to enable/disable driver and reset DAC: Logic High – enable, Logic Low – disable/reset. 5 CTRL DAC Serial Input pin is used to control LED current. Positive pulse edges sequentially increase LED current with 33.33mA steps up to 033 mA (3 steps). When this pin is held LOW for longer than 00µs the part enters Sleep Mode. 6 GND Ground pin for control and bias blocks. 7 - 8 GNDP Ground pin. LED current flows through this pin to ground. . 2. 3. 4. 5. 6. 7. 8. 9. 0. . Notes (Continued from previous page) |
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