HV841K6-G Supertex, HV841K6-G Datasheet

Display Drivers High Voltage Dual EL Lamp

HV841K6-G

Manufacturer Part Number
HV841K6-G
Description
Display Drivers High Voltage Dual EL Lamp
Manufacturer
Supertex
Datasheet

Specifications of HV841K6-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
Part Number:
HV841K6-G
Manufacturer:
FUJITSU
Quantity:
2 878
Features
Applications
Typical Application Circuit
Independent input control for lamp selection
Split supply capability
Patented output timing
One miniature inductor to power both lamps
Low shutdown current
Wide input voltage range 2.0 to 5.8V
Output voltage regulation
No SCR output
Available in small packages (10-Lead DFN and MSOP)
Mobile cellular phones, dual display
Keypad and LCD backlighting
Portable instrumentation
Dual segment lamps
Hand held wireless communication devices
V
0 = OFF
EN
V
V
IN
DD
= ON
+
-
+
-
V
0 = OFF
EN
= ON
High Voltage Dual EL Lamp Driver
1 The bigger sized lamp should be tied to EL1 and the smaller
C
C
DD
IN
sized lamp to EL2 terminals (pins 10 and 9 respectively)
1235 Bordeaux Drive, Sunnyvale, CA 94089
R
SW-Osc
2
1
3
4
5
C1
VDD
RSW-Osc
C2
GND
HV841
General Description
The Supertex HV841 is a high voltage driver designed for
driving two EL lamps with a combined area of 3.5 square
inches. The input supply voltage range is from 2.0V to 5.8V.
The device is designed to reduce the amount of audible noise
emitted by the lamp. This device uses a single inductor and
minimum number of passive components to drive two EL
lamps. The nominal regulated output voltage of ±100V is
applied to the EL lamps. The chip can be enabled/ disabled
by connecting C1 and C2 (pins 1 and 4) to VEN/ Ground.
The HV841 has an internal oscillator, a switching MOSFET,
and two high voltage EL lamp drivers. An external resistor
connected between the RSW-Osc and the voltage supply pin
VDD sets the frequency for the switching MOSFET. The EL
lamp driver frequency is set by dividing the MOSFET switching
frequency by 128. An external inductor is connected between
the LX and the VDD pins. Depending on the EL lamp size, a
1.0 to 10.0nF, 200V capacitor is connected between CS and
Ground. The two EL lamps are connected between EL1 to
COM and EL2 to COM.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at CS. The voltage at CS
increases. Once the voltage at CS reaches a nominal value of
100V, the switching MOSFET is turned off to conserve power.
The outputs EL1 to COM and EL2 to COM are configured
as H bridges and switch in opposite states to achieve 200V
across the EL lamp.
COM
EL1
EL2
CS
LX
10
9
7
6
8
Tel: 408-222-8888
~
L
X
D
EL Lamp 1
www.supertex.com
C
S
1
EL Lamp 2
HV841
1

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HV841K6-G Summary of contents

Page 1

... The bigger sized lamp should be tied to EL1 and the smaller General Description The Supertex HV841 is a high voltage driver designed for driving two EL lamps with a combined area of 3.5 square inches. The input supply voltage range is from 2.0V to 5.8V. The device is designed to reduce the amount of audible noise emitted by the lamp ...

Page 2

... Ordering Information Package Options 10-Lead DFN Device 3.00x3.00mm body 1.00mm height (max) 0.50mm pitch HV841 HV841K6-G -G indicates package is RoHS compliant (‘Green’) Absolute Maximum Ratings Parameter Supply voltage Supply voltage Operating ambient temperature range Storage temperature range Absolute Maximum Ratings are those values beyond which damage to the device may occur ...

Page 3

... DD 220 2.0V to 5.8V DD 150 0. 500 0 190 µ 2.0V to 5.8V DD 273 3.0V. See Figure 1. IN 34.9 kHz V = 3.0V. See Figure --- -0.6 µ 2.0V to 5.8V DD 0.6 µ 2.0V to 5.8V DD 0.3 V --- V V --- DD EL COM ● Tel: 408-222-8888 ● www.supertex.com HV841 IC OFF ...

Page 4

... The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 terminals (pins 10 and 9 respectively) ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 EL1 Vcs Output EL2 Drivers Vcs COM EL Lamp 1 (1 BAS21 330µH 2 3.3 nF, 200V ● Tel: 408-222-8888 ● www.supertex.com HV841 Lamp 2 (1 ...

Page 5

... Battery Voltage = V 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. The waveform takes the shape of approximately 2RC time constants for rising and 2RC time constants for falling, where C is the ...

Page 6

... EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected 10 EL1 to this pin. can be determined as R SW-Osc1 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 6 decreases. A 470kΩ resistor will provide SW-Osc = (470k x 31.2k SW-Osc1 ● Tel: 408-222-8888 ● www.supertex.com HV841 . SW1 ...

Page 7

... MAX 1.00 0.05 JEDEC Registration MO-229, Variation VEED-5, Issue C, Aug. 2003. * This dimension is not specified in the original JEDEC drawing. The value listed is for reference only. Drawings not to scale. Supertex Doc. #: DSPD-10DFNK63X3P050, Version A101008. E Note 1 (Index Area D/2 x E/2) θ Seating ...

Page 8

... Supertex inc. 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 an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship ...

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