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MP3388SGR Datasheet(PDF) 11 Page - Monolithic Power Systems

Part # MP3388SGR
Description  50V, 8-String, Step-Up, White LED Driver
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP3388SGR Datasheet(HTML) 11 Page - Monolithic Power Systems

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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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