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HV881

更新时间： 2024-11-05 14:53:55
品牌 Logo 应用领域
美国微芯 - MICROCHIP /
页数 文件大小 规格书
8页 671K
描述
HV881 is a 16 channel EL lamp driver with a single common terminal. It can drive up to a 1nF EL la

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Supertex inc.  
HV881  
Dimmable, Low Noise, 16 channel  
EL Lamp Driver  
Features  
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.  
► 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  
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.  
► 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  
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.  
► 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  
Applications  
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.  
► Multi-segment, variable displays  
► Cell phone keypads and displays  
► Multi-segment remote controls  
► Handheld wireless communication products  
► Global Positioning Systems (GPS)  
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.  
General Description  
The Supertex HV881 is a 16 channel EL lamp driver with a  
single common terminal. It can drive up to a 1nF ELlamp 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 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.  
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).  
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com  
12345678

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