240Vpp High Voltage EL Lamp Driver
The MP3802 is a high output voltage, DC to AC converter designed for driving Electroluminescent (EL) lamps of up to 5 square inches. The device operates from an input voltage range of 2.5V to 5.5V, making it suitable for 1-cell Li-Ion and 2 or 3-cell alkaline/NiCad/NiMH battery applications. The device uses a single inductor and a minimum number of passive components. The MP3802 converts a low-voltage DC input to a ±120V regulated output voltage that drives the EL lamp.
The MP3802 is comprised of two stages: a boost stage and a H-bridge lamp driver stage. The boost stage converts the input voltage up to 120V. The H-bridge stage alternately switches the 120V to each terminal of the EL lamp.
The MP3802 has two separate internal oscillators for the boost and H-bridge stages. The frequency of each oscillator is set independently via external resistors. This flexibility allows the EL lamp circuit to be optimized for maximum performance. Also, the IC can be enabled /disabled by connecting these two resistors to VDD/GND.
The MP3802 is available in an 8-pin MSOP package.
- 2.5V to 5.5V DC Input Voltage
- 240VPP Regulated AC Output Waveform
- Single Cell Lithium-Ion Compatible
- 10nA Shutdown Current
- Adjustable EL Lamp Frequency
- Adjustable Converter Frequency
- Available in MSOP-8
- Split Supply Capability
- Output RegulationNo
- Typical LCD Screen SizesSmall (<10")
- fsw (kHz)240
- PackageMSOP-8, QFN-8 (3x3)
- Vpp (max) (V)240
- Rswitch (Ω)9
- Vin (max) (V)5.5