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XRP7618IGB-F Datasheet(PDF) 7 Page - Exar Corporation |
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XRP7618IGB-F Datasheet(HTML) 7 Page - Exar Corporation |
7 / 10 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 7/10 Rev. 1.0.0 a logic low to the converter via the SDB signal. Furthermore, the SDB signal is synchronous to the PWM signal when PWM dimming is used. OPEN LED PROTECTION The XRP7618 provides a built-in protection for open LED channel. Upon detection of an open LED channel event, the FB signal is driven low to allow the step-up converter to operate open loop which in turn raises the voltage on the remaining CHx pins. Upon reaching an internally pre-set threshold of 3V, the XRP7618 identifies the faulty channel and removes it from the control and reporting loop. At this point the FB signal resumes its normal function of reporting the lowest LED channel voltage and hence restores the proper operations of the converter. Note that the open LED channel is not disabled; however, its CHx voltage is no longer reported. Upon reconnection of the open LED channel, current will be driven at the programmed level. PARALLEL MODE OF OPERATION Multiple XRP7618s can be placed in parallel to drive over 8 strings of LEDs; however, unused channels should be tied to ground. While the initial XRP7618 is connected to the step-up converter via its FB and SDB pins, the daisy chained XRP7618s are connected to each other through the respective FBX and SDBX pins. In this configuration, the initial XRP7618 reports the lowest LED voltage and SDB signal of all the XRP7618s in parallel. Refer to figure 12. TYPICAL APPLICATION SCHEMATICS Fig. 11: Single XRP7618 Application |
Similar Part No. - XRP7618IGB-F |
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Similar Description - XRP7618IGB-F |
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