Compact High-Efficiency EL Lamp Driver Targets PDAs

Aug. 21, 2000
The SP4403 lamp driver for backlighting electroluminescent (EL) displays suits personal digital assistants. It offers a small form factor, high efficiency, and sufficient drive for a bright output from EL display lamps. Its high coil-switching...

The SP4403 lamp driver for backlighting electroluminescent (EL) displays suits personal digital assistants. It offers a small form factor, high efficiency, and sufficient drive for a bright output from EL display lamps. Its high coil-switching frequency facilitates the use of 470-µH inductors that are less than 2 mm high. The inductor typically switches at 51.2 kHz with a 90% duty cycle and a maximum peak coil current of 75 mA.

Additionally, the SP4403's resistor-controlled oscillator design delivers narrow lamp frequency distributions, as well as tight performance between -40°C and 85°C. An 8-pin µSOIC package minimizes board-space requirements, and a low-power standby mode draws only 50 nA, typically, and 1 µA maximum in the shutdown mode.

The SP4403 operates from a battery voltage of 2.2 to 4.5 V at a typical, 38-mA supply current. This dc-ac inverter also produces up to 220 V p-p ac (210 V ac typical) when driving an EL display panel operating at a typical frequency of 400 Hz. It's manufactured on a dielectrically isolated biCMOS process.

The SP4405, a pin-compatible version of the SP4403, includes a regulated output voltage that maintains constant brightness over the battery's life.

Currently available, the SP4403 costs $0.87 each in 10,000-unit quantities. Samples are available from stock. Data sheets and additional information can be found at www.sipex.com/newproducts.

Sipex Corp., 22 Linnell Circle, Billerica, MA 01821; (978) 667-8700; fax (978) 670-9001; www.sipex.com.

Sponsored Recommendations

Highly Integrated 20A Digital Power Module for High Current Applications

March 20, 2024
Renesas latest power module delivers the highest efficiency (up to 94% peak) and fast time-to-market solution in an extremely small footprint. The RRM12120 is ideal for space...

Empowering Innovation: Your Power Partner for Tomorrow's Challenges

March 20, 2024
Discover how innovation, quality, and reliability are embedded into every aspect of Renesas' power products.

Article: Meeting the challenges of power conversion in e-bikes

March 18, 2024
Managing electrical noise in a compact and lightweight vehicle is a perpetual obstacle

Power modules provide high-efficiency conversion between 400V and 800V systems for electric vehicles

March 18, 2024
Porsche, Hyundai and GMC all are converting 400 – 800V today in very different ways. Learn more about how power modules stack up to these discrete designs.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!