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HV856

更新时间： 2024-11-04 03:43:11
品牌 Logo 应用领域
超科 - SUPERTEX 驱动器高压
页数 文件大小 规格书
7页 453K
描述
High Voltage Tri-EL Lamp Driver IC

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中文翻译

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HV856 数据手册

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HV856  
High Voltage Tri-EL Lamp Driver IC  
Features  
General Description  
The Supertex HV856 is a high voltage, triple EL lamp driver  
designed for driving combined EL lamps of up to 3.0in2 (1.0 in2  
each). It is a higher voltage version of the HV858. The input  
supply voltage range is from 1.8V to 6.5V. The device is de-  
signed so that the input voltage to the inductor can differ from  
the input voltage to the device (split supply). The device uses  
a single inductor and a minimum number of passive compo-  
nents. The nominal regulated output voltage that is applied to  
the EL lamp is 105V. The HV856 has two internal oscillators;  
one for the internal switching MOSFET and the other for the  
high voltage EL lamp driver. The EL lamp frequency is fixed  
internally at 500Hz. The power converter oscillator runs 256  
times faster than the EL lamp driver at 128kHz.  
► High voltage, Tri-EL lamp driver with common terminal  
► Independent brightness control for all three lamps  
► 210VPP output voltage for higher brightness  
► 1.8V to 6.5V operating supply voltage  
► Output voltage regulation  
► Two-pin serial data communication for control  
► Linear brightness control with seven steps at constant  
efficiency  
► 128kHz fixed switching frequency  
► Split supply capability  
► Patented high efficiency EL lamp driver  
► Single miniature inductor drives all three lamps  
► Only four external components  
► Burst mode power converter for best efficiency  
► CMOS compatible serial interface with noise rejection  
► 150nA max. leakage current when disabled  
► Power-on reset causes all outputs to be off when first  
powered up  
► Available in 10-Lead DFN package (0.8mm thickness)  
An external inductor is connected between the LX and VDD  
pins (or between the LX pin and separate voltage source in  
the case of a split supply application). A 0.002-0.01µF, 200V  
capacitor is connected between the CS pin and ground.  
The switching MOSFET charges the external inductor and  
discharges it into the capacitor at the CS pin. The voltage at  
CS will start to increase. Once the voltage at CS reaches a  
nominal value of 105V, the switching MOSFET is turned OFF  
to conserve power.  
One side of the three EL lamps is connected to the COM pin  
of the HV856 and the other side to the EL1, EL2, and EL3 pins  
of the HV856. Each EL lamp output may be independently  
controlled to have one of the seven brightness levels or can  
be completely turned OFF by a 10-bit serial data input register.  
The 10-bit control code has three bits to control the bright-  
ness level of each EL lamp and one bit to optionally control  
the power converter. The 3-bit binary brightness control code  
controls the number of 500Hz cycles (from 0 to 7) in a group  
of seven cycles.  
Applications  
► Multi-segment, variable displays  
► Cell phone keypads and displays  
► MP3 players  
Typical Application Circuit  
LX  
+
-
D
CS  
VIN  
CIN  
1
2
10  
LX  
CS  
9
COM  
GND  
VDD  
SDI  
8
3
4
5
EL3  
EL2  
EL1  
EL Lamp 3  
EL Lamp 2  
EL Lamp 1  
+
7
6
VDD  
CDD  
-
SCK  
Serial Data in  
Clock  
HV856K7  
1234567

中文翻译

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