HV857中文资料Low Noise, High Voltage EL Lamp Driver IC数据手册Microchip规格书

描述 Description

The HV857 is a high voltage driver designed for driving Electroluminescent (EL) lamps of up to 5 square inches. The input supply voltage range is from 1.8 to 5.0V. 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 ±95V. The chip can be enabled/disabled by connecting the resistor on RSW-Osc to VDD/GND.The HV857 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 the supply pin VDD. The EL lamp driver frequency is set by an external resistor connected between RELOsc pin and VDD pin. An external inductor is connected between the LX and VDD pins or VIN for split supply applications. A 0.003- 0.1μF capacitor is connected between CS and ground. The EL lamp is connected between VA and VB.The switching MOSFET charges the external inductor and discharges it into the capacitor at CS. The voltage at CS will start to increase. Once the voltage at CS reaches a nominal value of 95V, 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 ±95V across the EL lamp.

特性 Features

• Patented audible noise reduction
• Patented lamp aging compensation
• 190 VPP output voltage for higher brightness
• Patented output timing for high efficiency
• Single cell lithium ion compatible
• 150nA shutdown current
• Wide input voltage range 1.8 to 5.0V
• Separately adjustable lamp and converter frequencies
• Output voltage regulation
• Split supply capability

简介

HV857属于集成电路（IC）的照明镇流器控制器。由制造生产的HV857照明，镇流器控制器此产品族中的产品可用于实现控制和调节功能。对于日光灯、电致发光灯和 HID 灯等非 LED 照明工具的正常工作，这些功能很有必要或十分有用。既定器件所具备的特定功能集因预期用途各异，并且所供应的产品可能包括相应资源以直接控制驱动负载的电源，也可能不包括这些资源。