HV859MG-G Supertex, HV859MG-G Datasheet

Display Drivers High Voltage Low Noise EL Lamp

HV859MG-G

Manufacturer Part Number
HV859MG-G
Description
Display Drivers High Voltage Low Noise EL Lamp
Manufacturer
Supertex
Datasheet

Specifications of HV859MG-G

Mounting Style
SMD/SMT
Package / Case
MSOP-8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
Applications
Typical Application Circuit
Supertex inc.
Patented audible noise reduction
Patented lamp aging compensation
210 V
Patented output timing for high efficiency
Single cell lithium ion compatible
150nA shutdown current
Wide input voltage range 1.8 to 5.0V
Separately adjustable lamp and converter
frequencies
Output voltage regulation
Split supply capability
LCD backlighting
Mobile Cellular Phone keypads
PDAs
Handheld wireless communication products
Global Positioning Systems (GPS)
OFF = 0V
ON = V
PP
V
V
DD
IN
output voltage for higher brightness
Supertex inc.
+
-
+
-
DD
Enable
High Voltage EL Lamp Driver
C
C
for Low Noise Applications
DD
IN
1235 Bordeaux Drive, Sunnyvale, CA 94089
R
R
SW
EL
1
2
3
4
VDD
RSW-Osc
REL-Osc
GND
General Description
The Supertex HV859 is a high voltage driver designed for driving
Electroluminescent (EL) lamps of up to 5.0 square inches. The
input supply voltage range is from 1.8 to 5.0V. 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 chip can be enabled/disabled by connecting
the resistor on RSW-Osc to VDD/ground.
The HV859 has two internal oscillators, a switching MOSFET,
and a high voltage EL lamp driver. The frequency for the
switching MOSFET is set by an external resistor connected
between the RSW-Osc pin and the supply pin VDD. The EL
lamp driver frequency is set by an external resistor connected
between REL-Osc pin and the VDD pin. An external inductor is
connected between the LX and VDD pins or VIN for split supply
applications. A 0.003-0.1µF capacitor is connected between CS
and ground. The EL lamp is connected between VA and VB.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at CS. 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. The outputs VA and VB are configured as an H bridge
and are switching in opposite states to achieve ±105V across
the EL lamp.
HV859
VA
VB
CS
LX
Tel: 408-222-8888
8
7
6
5
R
L
SER
X
D
www.supertex.com
C
S
EL Lamp
HV859

Related parts for HV859MG-G

HV859MG-G Summary of contents

Page 1

... Supertex inc. for Low Noise Applications General Description The Supertex HV859 is a high voltage driver designed for driving Electroluminescent (EL) lamps 5.0 square inches. The input supply voltage range is from 1.8 to 5.0V. The device uses a single inductor and a minimum number of passive components. ...

Page 2

... EL T Operating temperature A Supertex inc. Pin Configurations 8-Lead MSOP 3.00x3.00mm body 1.10mm height (max) 0.65mm pitch HV859MG-G Value -0.5V to 6.5V -40°C to +85°C Product Marking -65°C to +150°C 1.6W 300mW -0.5V to +130V Package may or may not include the following marks θ ...

Page 3

... Switching transistor frequency D Switching transistor duty cycle * The inductor used is a 220µH Murata inductor, max DC resistance of 8.4Ω, part # LQH32CN221K21. Functional Block Diagram VDD Switch RSW-Osc OSC GND Disable V DD Switch RSW-Osc OSC Supertex inc. Min Typ 0 Min Typ - - 95 105 190 ...

Page 4

... Fig. 2. The regulated voltage can be used to run the internal logic of the HV859. The amount of current necessary to run the internal logic is 150µA max 3.0V. Therefore, the regulated voltage could easily provide the current without being loaded down. Supertex inc. VDD 1 HV859 560k ...

Page 5

... Audible Noise Reduction This section describes a method (patented) developed at Supertex to reduce the audible noise emitted by the EL lamps used in application sensitive to audible noise. Fig. 3 shows a general circuit schematic that uses the resistor connected in series with the EL lamp. SER How to Minimize EL Lamp Audible Noise: The EL lamp, when lit, emits an audible noise ...

Page 6

... Lamp greater than the power dissipation of the package, an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation. Supertex inc. is used to boost the low input voltage by inductive flyback. When the internal X 1235 Bordeaux Drive, Sunnyvale, CA 94089 ...

Page 7

... Dimension NOM 0.75 0.02 (mm) MAX 0.80 0.05 JEDEC Registration MO-229, Variation WEEC-2, Issue C, Aug. 2003. * This dimension is not specified in the JEDEC drawing. Drawings not to scale. Supertex Doc. #: DSPD-8DFNK73X3P065, Version C081109. Supertex inc. E Note 1 (Index Area D/2 x E/2) θ Seating Plane A3 Note 2 ...

Page 8

... JEDEC Registration MO-187, Variation AA, Issue E, Dec. 2004. * This dimension is not specified in the JEDEC drawing. Drawings are not to scale. Supertex Doc. #: DSPD-8MSOPMG, Version H041309. (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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