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XRP2997 Datasheet(PDF) 2 Page - Exar Corporation |
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XRP2997 Datasheet(HTML) 2 Page - Exar Corporation |
2 / 7 page X XR RP P7 76 61 18 8 8 8--C Ch ha an nn ne ell C Co on ns stta an ntt C Cu urrrre en ntt L Liin ne ea arr L LE ED D D Drriiv ve err W Wiitth h S Sm ma arrtt T Ta allk kTTM M © 2011 Exar Corporation 2/7 Rev. 2.2.0 PIN ASSIGNMENT Fig. 2: XRP7618 Pin Assignment PIN DESCRIPTION Name Pin Number Description CHx 1, 2, 3, 4, 7, 8, 9, 10 CH1 to CH8 pins Connect an LED between each pin and LED supply rail voltage (VLED). Current value is controlled by RSET. Connect unused channel(s) to GND. NC 12 Not Connected PWM 11 PWM pin This must be held HIGH to enable the output drivers. It can be used for PWM dimming up to 25kHz. If not used, connect to VCC. FBX 13 FBX input pin Used in parallel configuration as an interface terminal by connecting it to FB pin of the next XRP7618. If not used, leave it unconnected. ISET 14 ISET pin Connect resistor RSET from this pin to ground to set LED channel current as per ICHANNEL=1.194x400/RSET FB 15 FB pin Samples the LED cathode voltage on each channel and outputs the lowest voltage to the step-up converter. SDB 16 SDB output pin SDB signal is synchronous with the PWM signal during PWM Dimming. SDB pin outputs low logic to the step-up converter under conditions such as shutdown or when all channels are inactive. SDBX 17 SDBX input pin Used in parallel configuration as an interface terminal by connecting it to SDB pin of the next XRP7618. If not used, connect it to GND. AGND 18 Ground pin VCC 19 Input Voltage pin Must be closely decoupled to GND pin with a 0.1μF ceramic capacitor. EN 20 Enable pin This pin must be held HIGH to enable the XRP7618. PGND 5, 6 Ground pin EP Exposed Pad Exposed Pad Connect to ground ORDERING INFORMATION Refer to XRP7618’s datasheet and/or www.exar.com for exact and up to date ordering information. |
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