HV881中文资料Dimmable, Low Noise, 16 channel EL Lamp Driver数据手册Microchip规格书

描述 Description

HV881 is a 16 channel EL lamp driver with a single common terminal. It can drive up to a 1nF EL lamp load (approx. 0.3in2 lamp size) on each of the sixteen channels.The input supply voltage range is 1.8 to 5.5V. The logic interface to the device can be as low as 1.7V. The device has an enable logic input pin to turn the device on or off. The device is designed to minimize audible noise emitted by the EL lamp. The HV881 uses an external MOSFET, a single inductor and minimum number of passive components to drive all sixteen EL lamps. The device is designed such that the input voltage to the inductor can be different from the input voltage to the device (split supply). The HV881 has two internal oscillators and a high voltage EL lamp driver. An external MOSFET is driven by the switch oscillator to generate output voltage.The frequency for the external switching MOSFET is set by an external resistor connected between the RSW-Osc pin and the VDD supply pin. The EL lamp driver frequency can be set by either an external logic signal frequency at the SEL pin or by an external resistor connected between the REL-Osc pin and VDD pin. If external frequency is input at the SEL pin, the REL-Osc pin should be connected to ground. An external inductor is connected between the LX and VDD or VIN pins for split supply applications. Depending upon the EL lamp sizes, a 1.0 to 10.0nF capacitor is connected between the CS pin and ground. The CS capacitor is connected to the internal H-bridge, and the energy stored in the capacitor is therefore transferred to the EL lamp. One side of all the sixteen EL lamps is connected to the respective EL pins (EL1, EL2, etc.), and the other side is connected to the COM pin.The external switching MOSFET charges the inductor and discharges it into the capacitor at CS. The voltage at CS will start to increase. Once the voltage at CS reaches the desired regulation limit, the external switching MOSFET is turned off to conserve power.The HV881 allows for controlling the fall time of the EL1 - EL16 outputs by an external resistor from the RSLOPE pin to the VDD pin. This feature can be used to reduce the audible noise of the EL lamp or to increase the lamp brightness.The brightness of each of the sixteen EL lamps can be independently controlled to have one of fifteen brightness levels or can be completely turned off by the serial data (SDA) input. The serial data input has a 4-bit binary code for each lamp, to control the brightness level from level 0 to level 15. The brightness is controlled by controlling the number of EL frequency cycles (from 0 to 15) in a group of 15 cycles.

特性 Features

• Sixteen channel EL lamp driver with single common terminal
• 1nF maximum load on each of the sixteen channels
• Independent dimming capability for all lamps
• Sixteen brightness levels for each lamp
• 1.8 to 5.5V operating supply range
• 1.7V logic interface
• Dedicated enable logic pin
• 340VP-P nominal output voltage for high brightness
• Low audible noise
• Output voltage regulation
• EL1 - EL16 outputs fall time control
• Two EL frequency controls
• External switching MOSFET
• I2C data communication control
• Single lithium-ion cell compatible
• One miniature inductor to power sixteen lamps
• Independent lamp and converter frequency setting
• Split supply capability
• 5x5mm, 32-Lead QFN package

简介

HV881属于集成电路（IC）的照明镇流器控制器。由制造生产的HV881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。