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HV832
HV832 Dual High Voltage, Low Noise EL Lamp Driver
Features
8-pin dual EL driver IC Input control for lamp selection Split supply capability Patented output timing One minature inductor to power both lamps 150nA shutdown current Wide input voltage range (2.0V to 5.0V) Output voltage regulation No SCR output
General Description
The Supertex HV832 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 5.0V. The device is designed to reduce the amount of audible noise emitted by the lamp. 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 90V. The HV832 has an internal oscillator, a switching MOSFET, and two high voltage EL lamp drivers. The frequency for the switching MOSFET is set at 51KHz nominal. The EL lamp driver frequency is set by dividing the MOSFET switching frequency by 128. An external inductor is connected between the LX and VDD pins or VIN for split supply applications. A 0.001 to 0.01F, 100V capacitor is connected between CS and Ground. The EL lamps are connected between EL1 to Com and EL2 to Com. An input control pin is available to select various modes of the device. Each logic pulse applied to the control pin will cause the device to change to the next mode. The sequence for the modes is: (1) EL1 on only, (2) EL2 on only, (3) both EL1 and EL2 on, and (4) device shuts down. During power up of the device, the mode will default to shut down. 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 90V, the switching MOSFET is turned off to conserve power. The outputs EL1 to Com and EL2 to Com are configured as H bridges EL1/EL2 and Com are switching in opposite states to achieve 180V across the EL lamp.
Applications
Dual display cell phones Keypad and LCD backlighting Dual segment lamps Handheld wireless communication devices
Typical Application
VDD Logic Input Pulse EL Lamp 1
1 EL1 2 VDD 3 Control
EL2 Com CS LX
8
EL Lamp 2
7 6 5
LX CS
+
VIN
4 GND
CIN
_
HV832MG
12/13/01
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the 1 Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
HV832
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified, TA = 25C)
Symbol RDS(ON) VCS Vdiff IDDQ IDD IIN Parameter On-resistance of switching transistor Output regulation voltage differential output voltage across each lamp (EL1 to Com, EL2 to Com) Quiescent VDD supply current Input current into VDD pin Input current including inductor current 27 32 mA 38 VCS Output voltage on VCS 43 80 160 90 180 Min Typ Max 7.0 100 200 150 150 Units V V nA A VDD = 2.0V to 5.0V VIN = 3.0V. Driving EL1 or EL2. See Figure 1. VIN = 3.0V. Driving both EL1 and EL2. See Figure 1. VIN = 3.0V. Driving EL1 or EL2. See Figure 1. VIN = 3.0V. Driving both EL1 and EL2, See Figure 1. Hz KHz KHz % 0.6 A 0.6 0 1.75 0.25 VDD V V VIN = 3.0V. See Figure 1. VIN = 3.0V. See Figure 1. TA = -40C to +85C See Figure 1. Conditions I = 100mA VDD = 2.0V to 5.0V VDD = 2.0V to 5.0V
68 62
78 70 400 51.2
87 78 450 57.6 +/- 5.0
V
fEL fSW fSW Drift D IIL
Vdiff output drive frequency Switching transistor frequency Switching transistor frequency Drift Switching transistor duty cycle Input logic low current going into the control pin. Input logic high current going into the control pin. Logic input low voltage Logic input high voltage
350 44.8
85
IIH VIL VIH
VDD = 2.0V to 5.0V. See Figure 1.
* The inductor used is a 330uH Murata inductor, max DC resistance of 10 Ohms, part # LQH32CN331.
Recommended Operating Conditions
Symbol VDD TA Supply voltage Operating temperature Parameter Min 2.0 -40 Typ Max 5.0 85 Units V C Conditions
Absolute Maximum Ratings*
Supply voltage, VDD Output voltage, VC
S
Ordering Information
-0.5V to 7.5V Package Options Device HV832 MSOP-8 HV832MG* Die HV832X
-0.5V to +120V -40C to +85C
Operating Temperature Range Storage Temperature Range 8 Pin MSOP Power Dissipation
* All voltages are referenced to ground.
* Product supplied on 2500 piece carrier tape reels.
-65C to +150C 300mW
2
HV832
Function Table
Control Pin Power up 1st pulse L to H 2nd pulse L to H 3rd pulse L to H EL1 HI Z ON HI Z ON HI Z EL2 HI Z HI Z ON ON HI Z Com HI Z ON ON ON HI Z IC OFF ON ON ON OFF
4th pulse L to H
Pin Configuration
EL1 VDD Control GND
1 2 3 4
8 7 6 5
EL2 Com VCS LX
top view MSOP-8
3
HV832
Functional Block Diagram
LX VDD CS Control Control Logic & Switch Osc EL1
GND Disable
+ C _ Vref
Vsen
EL Osc = Switch Osc / 128
High Voltage Level Translator
EL2
Com
Figure 1: Typical Application Circuit/Test Circuit
VDD Logic Input Pulse VDD = VIN EL Lamp 1=1.5in2
1 EL1 2 VDD 3 Control
EL2 Com CS LX
8 7 6 5
LX 330H 3.3nF 100V IN914*
EL Lamp 2=1.5in2
VIN
+ _
4
4.7F
GND
HV832MG
LX = 330H Murata (LQH32CN331)
* any (equivalent or better) >90V, fast reverse recovery diode
Device HV832MG
Lamp EL1 or EL2 ON Both EL1 and EL2 ON
VDD 3.0V
IDD 27mA 38mA
VCS 78V 70V
fEL 400Hz
Brightness 7.5ft-lm 6.2ft-lm
4
HV832
Typical Performance Curves for Figure 1 with one output ON (EL Lamp=1.5in2, VDD=3.0V)
100 90
Vcs vs Vin 30 28
Iin vs Vin
VCS (V)
lin (mA)
80 70 60 50 1.5 2 2.5 3 3.5 Vin (V) 4 4.5 5 5.5
26 24 22 20 1.5 2.5 3.5 Vin (V) 4.5 5.5
Brightness vs Vin 10
Brightness (ft-lm)
30 28
Iin vs Vcs
9
lin (mA)
8 7 6 5 4 1.5 2.5 3.5 Vin (V) 4.5 5.5
26 24 22 20 60 65 70 75 80 85 90 95
Vcs (V)
Iin, Vcs, Brightness vs. Inductor Value
90 80 70 Vcs 10
IIN, VCS, Brightness vs. Inductor Value
9
Brightness (ft-lm)
Iin(mA), VCS (V) IIN (mA), Vcs(V)
60 50 Brightness 40 30 20 10 0 200 300 400 Inductor Value (H) 500 600 5 Iin 6 7 8
5
HV832
External Component Description
External Component Diode Cs Capacitor Lx Inductor Selection Guide Line Fast reverse recovery diode, IN914 or equivalent. 0.003F to 0.1F, 100V capacitor to GND is used to store the energy transferred from the inductor. The inductor Lx is used to boost the low input voltage by inductive flyback. When the internal switch is on, the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be transferred to the high voltage capacitor CS. The energy stored in the capacitor is connected to the internal H-bridge and therefore to the EL lamp. In general, smaller value inductors, which can handle more current, are more suitable to drive larger size lamps. As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across the EL lamp. The input power, (VIN x IIN), will also increase. If the input power is greater than the power dissipation of the package (300mW), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation.
Lamp
Split Supply Configuration
The HV832 can also be used for handheld devices operating from a battery where a regulated voltage is available. This is shown in Figure 2. The regulated voltage can be used to run the internal logic of the HV832. The amount of current necessary to run the internal logic is 150A Max at a VDD of 3.0V. Therefore, the regulated voltage could easily provide the current without being loaded down.
Figure 2: Split Supply
Regulated Voltage=VDD Logic Input Pulse EL Lamp 1
1 EL1 2 VDD 3 Control
EL2 Com CS LX
8
EL Lamp 2
7 6 5
LX CS
+ Battery Voltage=VIN _
4 GND
CIN
HV832MG
12/13/01rev.8
(c)2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
6
1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 * FAX: (408) 222-4895 www.supertex.com

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