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MP3394SGY Datasheet(PDF) 10 Page - Monolithic Power Systems |
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MP3394SGY Datasheet(HTML) 10 Page - Monolithic Power Systems |
10 / 17 page MP3394S—4-STRING, MAX 200mA/STRING WHITE LED DRIVER MP3394S Rev. 1.03 www.MonolithicPower.com 10 3/21/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. For external PWM dimming, ground the BOSC pin through a resistor, and apply an external PWM signal to the DBRT pin. For DC-input PWM dimming, apply a DC analog signal to the DBRT pin, and connect a capacitor on BOSC pin to ground. The DC signal is then converted to a DPWM dimming signal with a proportional oscillation frequency. The brightness of the LED array is proportional to the duty cycle of the DPWM signal. The DPWM signal frequency is set by the capacitor from the BOSC pin to ground. Open String Protection Open string protection is achieved through the OVP pin and the LED (1 to 4) pins. If one or more strings are open, the respective LEDX pins are pulled to ground and the IC keeps charging the output voltage until it reaches the over-voltage protection (OVP) threshold. Then the chip marks off the strings which have an LEDX pin voltage lower than 196mV. Once marked, the remaining LED strings force the output voltage back into tight regulation. The string with the largest voltage drop determines the output regulation. The MP3394S will always attempt to light at least one string. If all strings are open, the MP3394S shuts down the step-up converter. The strings will remain in this marked state until the chip reset. Short String Protection The MP3394S monitors the LEDX pin voltages to determine if a short string fault has occurred. If one or more strings are shorted, the respective LEDX pins tolerate high voltage stress. If an LEDX pin voltage is higher than 6.1V, this condition triggers the detection of a short string. When a short string faults (LEDX over-voltage fault) keeps for 4096 switching clocks, the fault string is marked OFF and disabled. Once a string is marked OFF, it disconnects from the output voltage loop. The marked LED strings shut off completely until the part restarts. If all strings are shorted, the MP3394S will shut down the step-up converter. The strings remain marked OFF until the chip resets. Thermal Shut Down Protection When MP3394S die temperature exceeds the thermal protection threshold, the thermal protection is triggered. IC shuts down until EN restart. |
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