New ANALOGICTECH AATI AAT1239 Series 40 V Step-Up Converter For 4 To 10 White Leds Eval Board Reviews
Other Picture
New ANALOGICTECH AATI AAT1239 Series 40 V Step-Up Converter For 4 To 10 White Leds Eval Board Feature
- AAT1239 Series 40 V Step-Up Converter for 4 to 10 White LEDs Eval Board.
- The AAT1239-1 is a high frequency, high efficiency constant current boost converter capable of driving up to ten (10) series-connected white LEDs or 40V.
- It is an ideal power solutions for backlight applications with up to ten white LEDs in series.
- The input voltage is 2.7V to 5.5V for single-cell lithium-ion/polymer (Li-ion) based portable devices.
- The LED current is digitally controlled across a 6x operating range using AnalogicTech's Simple Serial Control (S2Cwire) interface.
Programmability across 26 discrete current steps provides high resolution, low noise,flicker-free, constant LED outputs. In programming AAT1239 operation, LED brightness increases based on the data applied at the EN/SET pin. The SEL logic pin changes the feedback voltage between two programmable ranges. The AAT1239-1 features a high current limit and fast, stable transitions for stepped or pulsed current applications. The high switching frequency (up to 2MHz) provides fast response and allows the use of ultra-small external components, including chip inductors and capacitors. Fully integrated control circuitry simplifies design and reduces total solution size. The AAT1239-1 offers a true load disconnect feature which isolates the load from the power source while in the OFF or disabled state. This eliminates leakage current, making the devices ideally suited for battery-powered applications. The AAT1239-1 is available in the Pb-free, thermallyenhanced 12-pin TSOPJW package. Features: Input Voltage Range: 2.7V to 5.5V; Maximum Continuous Output 40V 30mA; Drives up to 10 LEDs in Series; Constant LED Current with 3.5% Accuracy Over Temperature and Input Voltage Range; Digital Control with S2Cwire Single Wire Interface; 26 Discrete Steps; No PWM Control Required; No Additional Circuitry; Up to 85% Efficiency; Up to 2MHz Switching Frequency Allows Small External Chip Inductor and Capacitors; Hysteretic Control; No External Compensation Components; Excellent Load Transient Response; High Efficiency at Light Loads; Integrated Soft Start with No External Capacitor; True Load Disconnect Guarantees 1.0mA Shutdown Current; Selectable Feedback Voltage Ranges for High Resolution Control of Load Current; Short-Circuit, Over-Voltage, and Over-Temperature Protection; 12-Pin TSOPJW Package; -40 degree C to +85 degree C Temperature Range. Applications: Color Display Backlight; Digital Still Cameras (DSCs); Digital Photo Frames; PDAs and Notebook PCs; White LED Drivers.
Visit Store Now !!
Aug 01, 2011 17:41:39
0 comments:
Post a Comment