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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SP7619ERL/TR датащи(PDF) 6 Page - Sipex Corporation |
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SP7619ERL/TR датащи(HTML) 6 Page - Sipex Corporation |
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6 / 8 page  6 Feb 9-07 Rev E Constant Current LED Driver © 2007 Sipex Corporation APPLICATION INFORMATION Shutdown The SP769 has a low current shutdown function. In shutdown mode the part draws lessthanµAcurrentmaximum.Thepartcan be placed into shutdown using the EN pin. ENABLE and CTRLpins cannot be tri-stated or left floating. There are no predefined in- ternal states, so leaving these pins open will cause the part to operate incorrectly. Timeout A Time Duration Before Shutdown feature actsasafailsafetoprotecttheLEDfromlong ON times. The nominal timeout is defined as 4 seconds at 500 (700)mA output current. Power-on-Reset This function is used to set Time Duration counters into their initial state after power up. No signal applied to the CTRL pin can be accepted during this time, even if the input voltage is applied simultaneously to the Vcc and ENABLE pins. To obtain the best performance from the SP769,aprintedcircuitboardwithground plane is required. High quality, low series resistance ceramic µF bypass capaci- tors should be used at the Vcc pin (pin 3). These capacitors must be located as close to the pins 3 – 6 as possible. The traces connecting the pins and the bypassing capacitor must be kept short and should be made as wide as possible. Pins – 2 are connected together internally but we recommend connecting the LED cathode to both pins to avoid additional power losses at high current. Pins 6, 7 and 8 should be connectedtothegroundplane.Boardlayout shouldpreventhighLEDgroundcurrentfrom flowing through signal ground connected to pin 6. This pin is a separate ground for the reference and logic sections of the SP769. The quiescent current for the part flows into the VCC pin and out of the GND pin. This current is proportional to the Iled current divided by approximately 500. BOARD LAYOUT AND GROUNDING |
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