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MP3388SGR Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MP3388SGR Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 15 page MP3388S—50V, 8-STRING, WHITE LED DRIVERS MP3388S Rev.1.01 www.MonolithicPower.com 11 10/29/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. Open-String Protection The open string protection is achieved through over-voltage protection (OVP). If one or more strings are open, the device pulls the respective LEDx pins to ground and the output voltage continues rising until it reaches the OVP threshold. Then the device records and disable the open LEDx strings with pin voltages less than 175mV. Once recording completes, the remaining LED strings force the output voltage back into tight regulation. The string with the highest voltage drop determines the output regulation level. The MP3388S will always try to light at least one string. If all strings in use are open, the MP3388S shuts down the step-up converter. The part retains low-voltage LEDx string information until the part shuts down. Short-String Protection The MP3388S monitors each LEDx pin voltage to determine if there is a short string. If one or more strings are shorted, the respective LEDx pins will be pulled up to the boosted output and tolerate high voltage stress. If the LEDx pin voltage exceeds 5.5V, the device treats this condition as a short string fault (LEDx over-voltage fault). If the voltage remains above 5.5V more than than 1.6ms (VOSC=HIGH), the device records the string and disables it. Once a string is recorded as a short, its current regulation is forced to disconnect from the output voltage loop regulation. The recorded LED strings remain OFF until the part restarts. If all strings in use are shorted, the MP3388S shuts down the step-up converter. |
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