HV856K7-G Supertex, HV856K7-G Datasheet

Display Drivers HI VLTG TRIPLE EL LAMP DRIVER

HV856K7-G

Manufacturer Part Number
HV856K7-G
Description
Display Drivers HI VLTG TRIPLE EL LAMP DRIVER
Manufacturer
Supertex
Datasheet
1.HV856K7-G.pdf (7 pages)

Specifications of HV856K7-G

Driver Type
EL Lamp Drivers
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
DFN-10
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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Applications
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Typical Application Circuit
Supertex inc.
High voltage, Tri-EL lamp driver with common
terminal
Independent brightness control for all three lamps
210V
1.8 to 6.5V operating supply voltage
Output voltage regulation
Two-pin serial data communication for control
Linear brightness control with seven steps at con-
stant 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 rejec-
tion
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 thick-
ness)
Multi-segment, variable displays
Cell phone keypads and displays
MP3 players
PP
output voltage for higher brightness
Supertex inc.
V
V
+
-
-
+
DD
IN
High Voltage Tri-EL Lamp Driver IC
Serial Data In
C
C
IN
DD
1235 Bordeaux Drive, Sunnyvale, CA 94089
Clock
L
X
1
2
3
4
5
LX
GND
VDD
SDI
SCK
General Description
The Supertex HV856 is a high voltage, triple EL lamp driver designed
for driving combined EL lamps of up to 3.0in
higher voltage version of the HV858. The input supply voltage range
is from 1.8 to 6.5V. The device is designed 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 components. 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.
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 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 seven cycles.
HV856
D
COM
EL3
EL2
EL1
CS
Tel: 408-222-8888
10
9
8
7
6
EL Lamp 2
EL Lamp 1
www.supertex.com
EL Lamp 3
C
S
2
(1.0 in
2
HV856
each). It is a

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HV856K7-G Summary of contents

Page 1

... Serial Data In Supertex inc. General Description The Supertex HV856 is a high voltage, triple EL lamp driver designed for driving combined EL lamps 3.0in higher voltage version of the HV858. The input supply voltage range is from 1.8 to 6.5V. The device is designed so that the input voltage to the inductor can differ from the input voltage to the device (split supply) ...

Page 2

... V Logic pin input High level HIGH * Code refers to the 3-bit Brightness Control Code for the respective EL Lamp Supertex inc. 10-Lead DFN 0.50mm pitch HV856K7-G Pin Configuration Value -0.5 to +7V -0.5 to +7V 0.7A peak Note: 0.5 to +120V The pads are at the bottom of the package. The center heat slug is at ground potential ...

Page 3

... SDI makes transition while SCK is H. Logic Input Diagram S1 S2 SDI MSB of LSB of EL1 EL1 Control SCK Notes: 1. Serial data is latched when SDI makes transition and while SCK the first serial data input being fed. Supertex inc. (cont.) Min Typ Max -0 94.3 ...

Page 4

... Enabled 7/7 H 6/7 H 5/7 H 4/7 H EL1 3/7 L 2/7 L 1/7 L OFF L 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 ( < 20 High (80 < Does not control brightness of the designated EL lamp Supertex inc ...

Page 5

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

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 three EL lamps 10 CS High voltage capacitor pin Supertex inc BAS21 1 LX HV856 CS 2 GND COM 3 VDD EL3 4 SDI EL2 5 ...

Page 7

... 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. (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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