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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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34845 Arkusz danych(PDF) 1 Page - Freescale Semiconductor, Inc |
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34845 Arkusz danych(HTML) 1 Page - Freescale Semiconductor, Inc |
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1 / 21 page  * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. Document Number: MC34845 Rev. 2.0, 9/2009 Freescale Semiconductor Advance Information © Freescale Semiconductor, Inc., 2009. All rights reserved. Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply The 34845 series represents high efficiency LED drivers for use in backlighting LCD displays from 10” to 17”+. Operating from supplies of 5.0 V to 21 V, the 34845 series is capable of driving up to 16 LEDs in series in 6 separate strings. The LED current tolerance in the 6 strings is within ±2% maximum and is set using a resistor to GND. PWM dimming is performed by applying a PWM input signal to the PWM pin which modulates the LED channels directly. An Enable Pin (EN) provides for low power standby. Alternatively, a single wire scheme selects power down when PWM is connected to the Wake Pin and held low. The integrated boost converter uses dynamic headroom control to automatically set the output voltage. There are three device versions for boost frequency; 34845 is 600 kHz, 34845A is 1.2 MHz and the 34845B is 300 kHz. External compensation allows the use of different inductor/ capacitor combinations. The 34845 includes fault protection modes for LED short and open, over temperature, over current and over voltage errors. It features an internally fixed OVP value of 60 V (typical) which protects the device in the event of a failure in the externally programmed OVP. The OVP level can be set by using an external resistor divider. Features • Input voltage of 5.0 to 21 V • Boost output voltage up to 60 V •2.0 A integrated boost FET • Fixed boost frequency - 300 kHz, 600 kHz or 1.2 MHz • OTP, OCP, UVLO fault detection • LED short/open protection • Programmable LED current between 3.0 mA and 30 mA • 24-Ld 4x4x0.65 mm μQFN Package Figure 1. 34845 Simplified Application Diagram 34845 34845A/B LED DRIVER 98ASA00087D 24-PIN QFN-EP ORDERING INFORMATION Device Temperature Range (TA) Package MC34845EP/R2 -40° to 85°C 24 QFN-EP MC34845AEP/R2 MC34845BEP/R2 Tape and Reel depicted with “R2” 12V FAIL PGNDB 34845 SWA SWB VOUT PGNDA CH1 CH2 CH3 CH4 CH5 CH6 EP EN PWM ISET VIN VDC1 VDC2 COMP WAKE ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ OVP GND GND CONTROL UNIT 5V Typical Applications • PC Notebooks • Netbooks • Picture Frames • Portable DVD Players • Small Screen Televisions • Industrial Displays • Medical Displays |
Podobny numer części - 34845 |
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Podobny opis - 34845 |
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