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IXYS unveils demo boards for LED drivers
Milpitas, Calif. — IXYS Corp. has released demo boards for the LDS8710/11, LDS8720/24/26 inductor-based, high-efficiency family of LED drivers that eliminates the external Schottky diode normally used in the rectification loop.
Here’s a quick rundown on the devices:
- The LDS8711 uses a SmartOne Wire Interface to set maximum LED current in the range from 0.5 to 32 mA in 0.25 mA steps and PWM dimming control. It can drive a string of 10 WLEDs.
- The LDS8710 drives a string of 10 LEDs with factory-preset maximum LED current values of 20, 25 and 30 mA with 1 percent accuracy and it uses PWM dimming to adjust LED brightness.
- The LDS8720/24 and LDS8726 use PWM dimming to adjust the LED brightness and are able to drive up to 40 LEDs and 42 WLEDs, respectively, at 30 mA current each. The LED drivers provide full output power from a single-cell lithium-ion battery or supply voltage in the range from 2.7 to 5.5 V.
The LDS8710/11 are suitable for (up to 7-inches) LCD display backlight applications such as smart phones, portable multimedia devices, E-books, personal navigation systems, personal medical displays and digital photo frames where battery life, display size, resolution and brightness are critical.
The LDS8720/24/26 target LCD display backlight applications (up to 15 inches) such as automotive displays, GPS, netbooks, laptop PCs, tablet computers and industrial and medical displays. Both device families are suitable to drive high brightness LEDs for lighting applications, such as battery-powered high intensity flash lights, security lights, automotive lights and street lights.
These drivers, combined with Zilog microcontrollers (MCUs) and Zilog motion sensing technology, provide the whole system solution for automated high-efficiency lighting control based on occupancy and as needed.
Each device in the family is a fixed frequency current-mode boost converter with a cycle-by-cycle current limit and features an integrated synchronous rectifier, which eliminates the external Schottky diode and isolation FETs. This reduces the bill of material and footprint of the display subsystem and also simplifies the design-in process and time to market of the end product, said IXYS.
The LDS8710/11/20 drivers are fixed 0.7-MHz frequency drivers, while the LDS8724/26 drivers operate at 1 MHz. The devices offer a wide PWM dimming frequency range (100 Hz to 10 KHz) as well as over-voltage, over-temperature, under-voltage and over-current protection, while the shut down current is below 1 microamp.
Although the LDS8710/11 drivers do not need an external current-sense resistor, the LDS8720/24/26 drivers require one to set LED current.
Since this family of LED drivers operates at a high switching frequency, small low-profile passive components (10-33 microhenry inductors and 1 microfarad 50V ceramic capacitor) can be used, which further reduces the system’s bill of material cost and enables a thin profile for the backlight unit, said IXYS. The system achieves higher than 86 percent efficiency.
All devices are available in an 8-pin TDFN package that measures 2 x 3 x 0.8 mm.
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