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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SP7616EB датащи(PDF) 8 Page - Exar Corporation |
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SP7616EB датащи(HTML) 8 Page - Exar Corporation |
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8 / 11 page  S SP P7 76 61 16 6 H Hiig gh h A Ac cc cu urra ac cy y 4 4--C Ch ha an nn ne ell L Lo ow w S Siid de e L LE ED D D Drriiv ve err ffo orr C CC CF FL L R Re ep plla ac ce em me en ntt © 2009 Exar Corporation 8/11 Rev. 2.0.4 VIN CONSIDERATIONS (IMPORTANT) The VIN pin of the SP7616 (Pin 1) needs to be connected to the anode of the LED for proper operation. If these are not tied together, the part can get into a latch condition as a result of improper sequencing. A second way the part can get into a latch condition is if the input voltage falls below 1.5V but does not fall below 0.5V before the power is re-applied. In both cases, the latch condition can be “reset” by pulling the input voltage below 0.5V for >3 seconds. This latch is similar to what one might experience with a uC if a reset was not asserted after a brown out condition. UNUSED CHANNELS AND LED 2 CHANNEL (PIN 7) LED 2 channel should never be grounded or left unconnected it should always be used during operation. Other unused channels can be tied to the ground to save on power consumption. SHORTED LEDS If all LEDs on a string are shorted, the LED cathode voltage will be VIN. It is still a working condition for this device but it significantly increases the dissipated power. At 20mA LED current and VIN = 30V additional power dissipated in the package is equal to 600mW that will increase die temperature to 59°C/W x 0.6W = 35.4C, where 59°C/W is the package thermal resistance. Assuming that all other channels are working at VLED =1.5V the die temperature will be approximately 41°C above ambient temperature and that decreases operating temperature range. Also to protect the part if too many LEDs are shorted, and the VLED voltage becomes to high, making the part dissipates too much power, the over temperature protection will shut the part off when the die temperature reaches approximately 150°C. OVER-TEMPERATURE PROTECTION The SP7616 has over-temperature protection to prevent permanent damage to the device. When the die temperature rises above 150°C the output drivers are shut off. The output current will self recover when the temperature drops below the trip point with the preset hysteresis of 15°C. Thus a part that shut off at 150°C will not try to restart unless the die temperature is below 135°C |
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