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HV859

更新时间: 2024-11-26 14:53:03
品牌 Logo 应用领域
美国微芯 - MICROCHIP /
页数 文件大小 规格书
20页 763K
描述
HV859 is a high voltage driver designed for driving Electroluminescent (EL) lamps of up to 5.0 squ

HV859 数据手册

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HV859  
High-Voltage EL Lamp Driver for Low-Noise Applications  
Features  
General Description  
• Patented Audible Noise Reduction  
• Patented Lamp Aging Compensation  
• 210 VPP Output Voltage for Higher Brightness  
• Patented Output Timing for High Efficiency  
• Single-cell Lithium Ion Compatible  
• 150 nA Shutdown Current  
• Wide Input Voltage range of 1.8V to 5V  
• Separately Adjustable Lamp and Converter  
Frequencies  
The HV859 is a high-voltage driver designed for driving  
Electroluminescent (EL) lamps of up to 5 in2. The input  
supply voltage range is from 1.8V to 5V. The device  
uses a single inductor and a minimum number of  
passive components. The nominal regulated output  
voltage that is applied to the EL lamp is ±105V. The  
chip can be enabled/disabled by connecting the  
resistor on RSW-Osc to VDD/Ground.  
• Output Voltage Regulation  
• Split Supply Capability  
The HV859 has two internal oscillators, a switching  
MOSFET and a high-voltage EL lamp driver. The  
frequency for the switching MOSFET is set by an  
external resistor connected between the RSW-Osc pin  
and VDD pin. The EL lamp driver frequency is set by an  
external resistor connected between RSW-Osc pin and  
the VDD pin. An external inductor is connected  
between the LX and VIN for split supply applications. A  
capacitor with a value between 0.003 µF to 0.1 µF,  
200V rated, is connected between CS and ground. The  
EL lamp is connected between VA and VB.  
Applications  
• LCD Backlighting  
• Mobile Cellular Phone Keypads  
• PDAs  
• Handheld Wireless Communication Products  
• Global Positioning Systems (GPS)  
The switching MOSFET charges the external inductor  
and discharges it into the capacitor at CS. Then, the  
voltage at CSwill start to increase. Once the voltage at  
CS reaches a nominal value of 105V, the switching  
MOSFET is turned off to conserve power. The outputs  
VA and VB are configured as an H bridge and are  
switching in opposite states to achieve ±105V across  
the EL lamp.  
Package Types  
8-lead WDFN  
8-lead MSOP  
1
8
VDD  
RSW-Osc  
REL-Osc  
GND  
VA  
VB  
CS  
LX  
VA  
VB  
CS  
LX  
1
2
3
4
8
7
6
5
VDD  
2
3
4
7
6
5
RSW-Osc  
REL-Osc  
GND  
Pads of the 8-lead DFN are at the bottom of the package. See Table 2-1 for pin  
information.  
2023 Microchip Technology Inc. and its subsidiaries  
DS20005711A-page 1  

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