HV843K7-G Supertex, HV843K7-G Datasheet

Display Drivers Low Noise Dual

HV843K7-G

Manufacturer Part Number
HV843K7-G
Description
Display Drivers Low Noise Dual
Manufacturer
Supertex
Datasheet

Specifications of HV843K7-G

Driver Type
EL Lamp Drivers
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
DFN-10
Maximum Output Current
4 mA
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
Applications
Typical Application Circuit
Low audible noise
Independent input control for lamp selection
180V
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 10-Lead DFN package
Dual display cellular phones
Keypad and LCD backlighting
Portable instrumentation
Dual segment lamps
Hand held wireless communication devices
pp
output voltage
Supertex inc.
1.5V
0
+
-
+
-
V
V
IN
DD
1.5V
0
Low Noise Dual EL Lamp Driver
C
0.1µF
C
4.7µF
DD
IN
1235 Bordeaux Drive, Sunnyvale, CA 94089
845kΩ
1
2
3
4
5
C1
VDD
RSW-Osc
C2
GND
HV843
General Description
The Supertex HV843 is a low noise, 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 a
minimum number of passive components to drive two EL lamps.
The nominal regulated output voltage of ±90V is applied to the
EL lamps. The two EL lamps can be turned ON and OFF by the
two logic input control pins, C1 and C2. The device is disabled
when both C1 and C2 (pins 1 and 4) are at logic low.
The HV843 has an internal oscillator, a switching MOSFET,
and two high voltage EL lamp drivers. Each driver has its own
half bridge common output (COM1 and COM2) connected to
a single pin called COM which minimizes the DC offset seen
by the EL lamp. An external resistor connected between
the RSW-Osc pin 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 512. An external inductor is connected between the LX
and the VDD pins. Depending on the EL lamp size, a 1.0 to
10.0nF, 100V capacitor is connected between CS and Ground.
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
90V, the switching MOSFET is turned OFF to conserve power.
COM
EL1
EL2
CS
LX
10
9
8
7
6
Tel: 408-222-8888
EL Lamp 1
L
330µH
X
D
EL Lamp 2
www.supertex.com
C
3.3nF, 100V
S
HV843

Related parts for HV843K7-G

HV843K7-G Summary of contents

Page 1

... IN - Supertex inc. General Description The Supertex HV843 is a low noise, 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 a minimum number of passive components to drive two EL lamps. The nominal regulated output voltage of ± ...

Page 2

... DDQ DD I Input current into the VDD pin DD Supertex inc. Pin Configuration 0.50mm pitch HV843K7-G Note: Pads are on the bottom of the package. Value Back-side heat slug is at ground potential. -0.5V to 7.5V Product Marking -0.5V to 120V -40°C to 85°C -65° ...

Page 3

... IL I Input logic low current IH V Logic input low voltage IL V Logic input high voltage IH Functional Block Diagram VDD RSW-Osc Control Logic and Switch C1 Oscillator C2 Logic Control and GND Supertex inc. (cont.) Min - when driving both lamps - 160 to COM2) 2 170 1 SENSE ...

Page 4

... Both EL and 3.0V 2 Both EL and Both EL and Supertex inc. Outputs EL1 1 VDD 2 EL2 845kΩ 3 RSW-Osc COM GND LX HV843 1. or any (equivalent or better) >90V, fast recovery diode 2. Cooper LPO6610-334MLB 3. The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 terminals (pins 10 and 9 respectively) ...

Page 5

... EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected 10 EL1 to this pin. Supertex inc. the internal logic is less than 200µA. Therefore, the regu- lated voltage could easily provide the current without being loaded down. C1 EL1 ...

Page 6

... 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 ...

Related keywords