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HV826 High Voltage EL Lamp Driver
Ordering Information
Package Options Device HV826 MSOP-8 HV826MG* SO-8 HV826LG Die HV826X
* Product supplied on 2500 piece carrier tape reels.
Features
1.8V to 3.5V operating supply voltage DC to AC conversion Adjustable output frequency Adjustable switch frequency Output voltage regulation Enable/disable function
General Description
The Supertex HV826 is a high voltage driver designed for driving EL lamps. The input supply voltage range is from 1.8V to 3.5V. 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 80V. The chip can be enabled/ disabled by connecting the resistor on RSW-OSC to VDD/ground. The HV826 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. A 0.01-0.1F 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 80V, 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 160V peak-to-peak across the EL lamp.
Applications
Mobile cellular phones Pagers Portable Transceivers Remote Control Units Calculators
Absolute Maximum Ratings*
Supply Voltage, VDD Output Voltage, VCs Operating Temperature Range Storage Temperature Range MSOP-8 Power Dissipation SO-8 Power Dissipation
Note: *All voltages are referenced to GND.
Pin Configuration
VDD RSW-osc REL-osc Gnd
1 2 3 4
8
-0.5V to +4.5V -0.5V to +100V -25 to +85C -65C to +150C 250mW 400mW VA VB CS LX
MSOP-8 and SO-8
7 6 5
Top View
11/12/01
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 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. 1
HV826
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified, TA=25C)
Symbol RDS(on) VCs VA-B IDDQ IDD IIN VCS fEL fSW D Parameter On-resistance of switching transistor Max. output regulation voltage Max. of differential output voltage across lamp Quiescent VDD supply current Input current going into the VDD pin Input current including inductor current Output voltage on VCS VA-B output drive frequency Switching transistor frequency Switching transistor duty cycle 65 300 35 70 375 80 88 450 75 150 80 160 Min Typ Max 7.0 85 170 100 150 45 Units V V nA A mA V Hz KHz % I=100mA VDD=1.8V to 3.5V VDD=1.8V to 3.5V RSW-osc = Low VDD=1.8V to 3.5V. See Figure 1. VIN=1.5V. See Figure 1. VIN=1.5V. See Figure 1. VIN=1.5V. See Figure 1. VIN=1.5V. See Figure 1. See figure 1. Conditions
Recommended Operating Conditions
Symbol VDD fEL TA Supply voltage VA-B output drive frequency Operating temperature Parameter Min 1.8 60 -25 Typ Max 3.5 1000 85 Units V KHz C Conditions
Enable/Disable Function Table
Symbol EN-L EN-H Parameter Logic input low voltage Logic input high voltage Min 0 VDD-0.5 Typ Max 0.5 VDD Units V V Conditions VDD=1.8V to 3.5V VDD=1.8V to 3.5V
2
HV826
Block Diagram
LX VDD CS RSW Switch Osc
Q
GND Disable
+ C _ Vref
Vsen
Q
VA
Output Osc
Q
Rel
Q
VB
Figure 1: Typical Application
ON=VDD OFF=0 VDD 560K Enable Signal VDD=3V
1 VDD 2 RSW-osc
VA VB
8
EL Lamp
7
VIN
+ _
4.7uF
3 REL-osc
1.0M
CS 6 LX 5 1N4148 LX* 220uH
4 Gnd
HV826MG or HV826LG
0.1F 100V
* LX = Murata LQH4N221K04
Operating VDD voltage: 1.8V to 3.5V EL lamp size: Up to 2.5 in2 Brightness: 3.0 to 5.0ft-lm
Typical Performance
Device HV826MG Lamp Size 1.6 in2 VIN 1.5V IIN 35mA VCS 66V fEL 345Hz Brightness 5.0ft-lm TA -25C to +85C
3
HV826
Typical Performance Curves for Figure 1 (1.6 in.2 lamp)
VCS vs. VIN
100 80 60 40 20 0 1 2 VIN (V) 3 4 40
IIN (mA)
IIN vs. VIN
30 20 10 0 1 2 VIN (V) 3 4
VCS (V)
Brightness vs. VIN
Brightness (ft-lm)
IIN vs. VCS
40
8 4 2 0 1 2 VIN (V) 3 4
IIN (mA)
6
30 20 10 0 60 70 VCS (V) 80 90
IIN, VCS, Brightness vs. Inductor Value
Vdd = 1.5V VDD = 3.0V VinVIN = 1.5V = 3.0V
90 80
IIN (mA), VCS (V)
6.0 5.0 4.0 3.0 2.0 1.0 0.0 100 220 330 Inductor Value (H) 560 900
Brightness (ft-lm)
70 60 50 40 30 20 10 0
4
HV826
Figure 2: Typical Application
Figure 2: VIN=3.0V=VDD ON=VDD OFF=0 Enable Signal Equivalent to 3 inch2 lamp 2.0K
1 VDD
750K
VA VB
8
10nF
2 RSW-osc
VIN=VDD
7
+ _
4.7uF
3 REL-osc
2.0M
CS 6 LX 5 1N4148 LX* 560uH
4 Gnd
HV826MG/LG
0.01F 100V
* LX = Murata LQH4N561K04
Operating VDD voltage: 1.8V to 3.5V EL lamp size: Up to 4.5 in2 Brightness: 3.0 to 5.0ft-lm
Typical Performance
Device HV826MG Lamp Size 3.0 in2 VDD 3.0V IDD 23mA VCS 80V fEL 195Hz Brightness 4.0ft-lm TA -25C to +85C
5
HV826
Typical Performance Curves for Figure 2 (3.0 in.2 lamp)
VCS vs. VIN
100 80 60 40 20 0 1 2 VIN (V) 3 4 25 20 15 10 5 0 1 2 VIN (V) 3 4
IIN vs. VIN
VCS (V)
Brightness vs. VIN
Brightness (ft-lm)
IIN (mA)
IIN vs. VCS
25 20 15 10 5 0 50 60 70 VCS (V) 80 90
5 4 3 2 1 0 1 2 VIN (V) 3 4
IIN, VCS, Brightness vs. Inductor Value
90
Brightness (ft-lm)
IIN (mA)
5.0 4.0 3.0 2.0
IIN (mA)
80
IIN (mA), VCS (V)
60 50 40 30 20 10 0 100 330 470 Inductor Value (H) 560 900 0.0
1.0
Brightness (ft-lm)
70
VCS (V)
11/12/01
(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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