Low Input Voltage/ 180VPP Output Voltage/ EL Driver
MIC4827
Micrel
MIC4827
Low Input Voltage, 180VPP Output Voltage, EL Driver Final Information
General Description
Micr...
Description
MIC4827
Micrel
MIC4827
Low Input Voltage, 180VPP Output Voltage, EL Driver Final Information
General Description
Micrel’s MIC4827 is a high output voltage, DC to AC converter, designed for driving EL (Electroluminescent) lamps. The device operates from an input voltage range of 1.8V to 5.5V, making it suitable for 1-cell Li Ion and 2- or 3-cell alkaline/NiCad/NiMH battery applications. The MIC4827 converts a low voltage DC input to a 180VPP AC output signal that drives the EL lamp. The MIC4827 is comprised of two stages: a boost stage, and an H-bridge, lamp driver, stage. The boost stage steps the input voltage up to +90V. The H-bridge stage then alternately switches the +90V output to each terminal of the EL lamp, thus creating a 180VPP AC signal to drive the EL lamp and generate light. The MIC4827 features separate oscillators for the boost- and H-bridge stages. External resistors independently set the operating frequency of each stage. This flexibility allows the EL lamp circuit to be optimized for maximum efficiency and brightness. The MIC4827 uses a single inductor and a minimum number of external components, making it ideal for portable, spacesensitive applications. The MIC4827 is available in an 8-pin MSOP package with an ambient temperature range of –40°C to +85°C.
Features
1.8V to 5.5V DC input voltage 180VPP regulated AC output waveform Independently adjustable EL lamp frequency Independently adjustable boost converter frequency 0.1µA shu...
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