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LP8556

AKTIV

LED-Hintergrundbeleuchtungstreiber mit 6 Kanälen und hohem Wirkungsgrad

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Datenblatt

LP8556

AKTIV
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Produktdetails

Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 48 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 95 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 6 Vin (min) (V) 2.7 Vin (max) (V) 20 Vout (min) (V) 7 Vout (max) (V) 48 Type Inductive Switching frequency (max) (kHz) 1250 Duty cycle (max) (%) 100 LED current per channel (mA) 50 Peak efficiency (%) 95 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YFQ) 20 3.96 mm² (— mm × — mm) WQFN (RTW) 24 16 mm² (4 mm × 4 mm)
  • High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
  • 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
    (2.7-V to 20-V VDD input range)
  • 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
  • Configurable channel count (1 to 6)
  • Up to 50 mA per channel
  • PWM and / or I2C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming for higher LED drive optical efficiency
  • Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
  • LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
  • Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package
  • High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
  • 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
    (2.7-V to 20-V VDD input range)
  • 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
  • Configurable channel count (1 to 6)
  • Up to 50 mA per channel
  • PWM and / or I2C brightness control
  • Phase-shift PWM mode reduces audible noise
  • Adaptive dimming for higher LED drive optical efficiency
  • Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
  • LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
  • Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package

The LP8556 device is a white-LED driver featuring an asynchronous boost converter and six high precision current sinks that can be controlled by a PWM signal or an I2C master.

The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. Programmable slew rate control and spread spectrum scheme minimize switching noise and improve EMI performance.

LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors.

The LP8556 device has a full set of fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.

The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.

The LP8556 device is a white-LED driver featuring an asynchronous boost converter and six high precision current sinks that can be controlled by a PWM signal or an I2C master.

The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. Programmable slew rate control and spread spectrum scheme minimize switching noise and improve EMI performance.

LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors.

The LP8556 device has a full set of fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.

The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LP8556 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. M) PDF | HTML 10.06.2020
Whitepaper Common LED Functions and LED Driver Design Considerations 21.09.2020
Anwendungshinweis Some Guidelines and Tips for the LED Driver Application 14.08.2019
Anwendungshinweis AN-1112 DSBGA Wafer Level Chip Scale Package (Rev. AI) 14.06.2019
Auswahlhilfe Power Management Guide 2018 (Rev. R) 25.06.2018
Anwendungshinweis Inductor Selection in Boost Converters for LCD Backlight Applications 24.10.2016
Anwendungshinweis Schottky Diode Selection in Asynchronous Boost Converters 06.09.2016
Anwendungshinweis Power Budget for Backlight Drivers 27.06.2013
Anwendungshinweis Increasing Full-Load Efficiency of a Backlight Driver 05.06.2013

Design und Entwicklung

Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.

Evaluierungsplatine

LP8556SQ-EVM — LP8556SQ-EVM

The Texas Instruments LP8556SQ-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

Benutzerhandbuch: PDF
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Evaluierungsplatine

LP8556TM-EVM — LP8556TM-EVM

The Texas Instruments LP8556TM-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)

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Treiber oder Bibliothek

LP8550SW-LINUX — Linux-Treiber für LP8550

The Linux driver supports the LP8550/1/2/3/5/6 and LP8557. The Linux driver supports communication through the I2C bus and interfaces with the backlight and PWM sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lp8550
  • lp8551
  • lp8552
  • (...)
Unterstützte Produkte und Hardware
Referenzdesign

TIDA-01635 — Referenzdesign für Hintergrundbeleuchtung und LCD-Bias für Displays mit 90 Hz Refresh-Rate Virtual/A

Das Referenzdesign beschreibt die Stromversorgungslösung für LCD-Displays in Wearables, insbesondere in Augmented Reality (AR)- und Virtual Reality (VR)-Headsets. Der Hintergrundbeleuchtungstreiber mit hoher Stromgenauigkeit wird durch LP8556 erreicht, das einen hohen Strom während eines kleinen (...)

Unterstützte Produkte und Hardware
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
DSBGA (YFQ) 20 Ultra Librarian
WQFN (RTW) 24 Ultra Librarian
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