LM36923
Hocheffizienter, synchroner 30-V-LED-Treiber für weiße LEDs mit drei Strings und 30 V
LM36923
- 1% Matched Current Sinks Across (Process, Voltage, Temp)
- 3% Current Sink Accuracy Across (Process, Voltage, Temp)
- 11-Bit Dimming Resolution
- Up to 91.6% Solution Efficiency
- Drives from One to Three Parallel LED Strings at up to 28 V
- PWM Dimming Input
- I2C Programmable
- Selectable 500-kHz and 1-MHz Switching Frequency with Optional –12% shift
- Auto Switch Frequency Mode (250 kHz, 500 kHz, 1 MHz)
- Four Configurable Overvoltage Protection Thresholds (17 V, 21 V, 25 V, 29 V)
- Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA, 1500 mA)
- Thermal Shutdown Protection
The LM36923 is an ultra-compact, highly efficient, threestring white-LED driver designed for LCD display backlighting. The device can power up to 8 series LEDs at up to 25 mA per string. An adaptive current regulation method allows for different LED voltages in each string while maintaining current regulation.
The LED current is adjusted via an I2C interface or through a logic level PWM input. The PWM duty cycle is internally sensed and mapped to an 11-bit current thus allowing for a wide range of PWM frequencies and noise-free operation.
The device operates over the 2.5-V to 5.5-V input voltage range and -40°C to 85°C temperature range.
For all available packages, see the orderable addendum at the end of the data sheet.Technische Dokumentation
Typ | Titel | Datum | ||
---|---|---|---|---|
* | Data sheet | LM36923 Highly Efficient Triple-String White LED Driver datasheet (Rev. A) | PDF | HTML | 07 Okt 2016 |
Application note | How to use the LM3697 Device to Design a Backlight Unit in a Smartphone | PDF | HTML | 15 Apr 2021 | |
White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
Application note | Analog PWM Dimming in White-LED Drivers | 21 Dez 2016 | ||
Application note | Inductor Selection in Boost Converters for LCD Backlight Applications | 24 Okt 2016 | ||
Application note | Auto-Frequency Mode Setting for Improved Boost Efficiency in White LED Backlight | 14 Okt 2016 | ||
Application note | Schottky Diode Selection in Asynchronous Boost Converters | 06 Sep 2016 | ||
EVM User's guide | Using the LM36923EVM Evaluation Module | 05 Mär 2015 |
Design und Entwicklung
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LM36923EVM — LM36923EVM Hocheffizienter dreistrangiger weißer LED-Treiber – EVM
The LM36923 Evaluation Module (LM36923EVM) is designed to fully evaluate the LM36923 Highly Efficient Triple-String White LED backlight driver. The LM36923EVM consists of the LM36923 with 3p8s white LED strings with jumpers to enable 1p2s thru 3p8s led string configurations. LED string (...)
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Gehäuse | Pins | CAD-Symbole, Footprints und 3D-Modelle |
---|---|---|
DSBGA (YFF) | 12 | Ultra Librarian |
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