HV858K7-G Supertex, HV858K7-G Datasheet

Display Drivers High Voltage Triple EL Lamp

HV858K7-G

Manufacturer Part Number
HV858K7-G
Description
Display Drivers High Voltage Triple EL Lamp
Manufacturer
Supertex
Datasheet
1.HV858MG-G.pdf (8 pages)

Specifications of HV858K7-G

Mounting Style
SMD/SMT
Package / Case
DFN-10
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Meier Automation Equipment Co., Limited Meier Automation Equipment Co., Limited
Part Number:
HV858K7-G
Manufacturer:
SUPERTEX
Quantity:
20 000
Features
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Applications
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Typical Application Circuit
Supertex inc.
Tri-EL lamp driver with common terminal
Independent brightness control for all 3 lamps
1.73 - 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 3 lamps
Only 4 external components
Burst mode power converter for best efficiency
CMOS compatible serial interface with noise
rejection
500nA max. leakage current when disabled
Power-on reset causes all outputs to be off when
first powered up
Mulit-segment, variable displays
Cell phone keypads and displays
MP3 players
Supertex inc.
V
V
+
-
+
-
IN
DD
Serial Data In
C
C
Clock
DD
IN
1235 Bordeaux Drive, Sunnyvale, CA 94089
L
X
Tri-EL Lamp Driver IC
1
2
3
4
5
LX
GND
VDD
SDI
SCK
HV858
General Description
The Supertex HV858 is a high voltage triple EL lamp driver
designed for driving combined EL lamps of up to 3.0in
each). The input supply voltage range is from 1.73 - 6.5V. 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
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 HV858 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.
An external inductor is connected between the LX and VDD pins
(or between the LX pin and a separate voltage source in the case
of a split supply application). A 0.001 - 0.01µF, 100V 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 the CS pin will start to
increase. Once the voltage at the CS pin reaches a nominal value
of 95V, the switching MOSFET is turned OFF to conserve power.
One side of the 3 EL lamps is connected to the COM pin of the
HV858, the other side to the EL1, EL2, and EL3 pins. Each EL
lamp output may be independently controlled to have one of the
7 brightness levels or can be completely turned OFF by a 10-
bit serial data input register. The 10-bit control code has 3 bits
to control the brightness 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 7 cycles.
D
COM
EL3
EL2
EL1
CS
10
9
8
7
6
Tel: 408-222-8888
EL Lamp 3
EL Lamp 2
EL Lamp 1
C
S
www.supertex.com
HV858
2
(1.0in
2

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HV858K7-G Summary of contents

Page 1

... Supertex inc. Tri-EL Lamp Driver IC General Description The Supertex HV858 is a high voltage triple EL lamp driver designed for driving combined EL lamps 3.0in each). The input supply voltage range is from 1.73 - 6.5V. The device is designed such that the input voltage to the inductor can be different from the input voltage to the device (split supply) ...

Page 2

... Ordering Information Package Options 10-Lead DFN Device 3.00x3.00mm body 0.80mm height (max) 0.50mm pitch HV858 HV858K7-G -G indicates package is RoHS compliant (‘Green’) Absolute Maximum Ratings Parameter V , supply voltage DD SDI, SCK V , output voltage Power dissipation: 10-Lead DFN 10-Lead MSOP Storage temperature Operating temperature Absolute Maximum Ratings are those values beyond which damage to the device may occur ...

Page 3

... SDI may SCK SCK may SDI While inputting serial data to the shift register, SDI can change value only when SCK The previous 10 bits of serial input will be latched when SDI makes transition while SCK is H. Supertex inc. (unless otherwise specified V = 2.6 - 5.5V Min Typ ...

Page 4

... Enabled 7/7 6/7 5/7 4/7 EL1 3/7 2/7 1/7 OFF 7/7 6/7 5/7 4/7 EL2 3/7 2/7 1/7 OFF 7/7 6/7 5/7 4/7 EL3 3/7 2/7 1/7 OFF L = Low ( L< 20 High (80 Supertex inc MSB of LSB of MSB of EL1 EL2 EL2 EL2 Control ...

Page 5

... The following is the differential output waveform across the lamp for each 3-bit input code for each lamp. Code 000 500Hz Code 001 Code 010 Code 011 Code 100 Code 101 Code 110 Code 111 Group of 7 Cycles Supertex inc. L VDD LX X Switch Osc Enable V + SENSE ...

Page 6

... Serial data input pin. 5 SCK Serial clock input pin. 6 EL1 EL Lamp 1 pin. 7 EL2 EL Lamp 2 pin. 8 EL3 EL Lamp 3 pin. 9 COM Common pin for one side of all 3 EL Lamps High voltage capacitor pin. Supertex inc IN914 68µ 4.7µ HV858 2 GND COM 3 VDD EL3 4 SDI ...

Page 7

... MIN 0.70 0.00 Dimension NOM 0.75 0.02 (mm) MAX 0.80 0.05 JEDEC Registration MO-229, Variation WEED-5, Issue C, Aug. 2003. * This dimension is not specified in the JEDEC drawing. Drawings not to scale. Supertex Doc.#: DSPD-10DFNK73X3P050, Version D041309. Supertex inc. E θ Seating Plane A3 L1 Note 0.18 2 ...

Page 8

... JEDEC Registration MO-187, Variation BA, Issue E, Dec. 2004. * This dimension is not specified in the JEDEC drawing. Drawings are not to scale. Supertex Doc. #: DSPD-10MSOPMG, Version F041309 (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.) does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives Supertex inc ...

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