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HV830 High Voltage EL Lamp Driver
Ordering Information
Package Options Device HV830 Input Voltage 2.0V to 9.5V 8-Lead SO HV830LG Die HV830X
Features
Processed with HVCMOS(R) technology 2.0V to 9.5V operating supply voltage DC to AC conversion 200V peak-to-peak typical output voltage Large output load capability - typically 50nF Permits the use of high-resistance elastomeric lamp connectors Adjustable output lamp frequency to control lamp color, lamp life, and power consumption Adjustable converter frequency to eliminate harmonics and optimize power consumption Enable/disable function Low current draw under no load condition Very low standby current - 30nA typical
General Description
The Supertex HV830 is a high-voltage driver designed for driving EL lamps of up to 50nF. EL lamps greater than 50nF can be driven for applications not requiring high brightness. The input supply voltage range is from 2.0V to 9.5V. 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 100V. The chip can be enabled by connecting the resistors on RSW-osc and REL-osc to VDD and disabled when connected to GND. The HV830 has two internal oscillators, a switching MOSFET, and a high-voltage EL lamp driver. The frequency for the switching converter 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 0.01F to 0.1F capacitor is connected between CS and GND. The EL lamp is connected between VA and VB. The switching MOSFET charges the external inductor and discharges it into the Cs capacitor. The voltage at Cs will start to increase. Once the voltage at Cs reaches a nominal value of 100V, the switching MOSFET is turned OFF to conserve power. The outputs VA and VB are configured as an H-bridge and are switched in opposite states to achieve 200V peak-to-peak across the EL lamp.
Applications
Handheld personal computers Electronic personal organizers GPS units Pagers Cellular phones Portable instrumentation
Pin Configuration
Absolute Maximum Ratings*
Supply Voltage, VDD Output Voltage, VCs Operating Temperature Range Storage Temperature Range Power Dissipation
Note: *All voltages are referenced to GND.
-0.5V to +10V -0.5V to +120V -25C to +85C -65C to +150C 400mW
VDD RSW-osc Cs Lx
1 2 3 4
8 7 6 5
REL-osc VA VB GND
SO-8
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 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.
HV830
Electrical Characteristics
DC Characteristics (VDD = 3.0V, RSW = 1M, REL = 3.3M, TA = 25C unless otherwise specified)
Symbol RDS(on) VCS VA - VB IDDQ IDD IIN VCS fEL fSW D Parameter On-resistance of switching transistor Output voltage VCS Regulation Output peak to peak voltage Quiescent VDD supply current, disabled 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 220 55 90 180 Min Typ 2 100 200 30 100 35 95 250 65 88 280 75 150 40 Max 6 110 220 Units V V nA A mA V Hz KHz % I = 100mA VDD = 2.0V to 9.5V VDD = 2.0V to 9.5V RSW-osc = Low VDD = 3.0V. See Figure 1. VDD = 3.0V. See Figure 1. VDD = 3.0V. See Figure 1. VDD = 3.0V. See Figure 1. VDD = 3.0V. See Figure 1. Conditions
Recommended Operating Conditions
Symbol VDD fEL TA Supply voltage VA-B Output drive frequency Operating temperature -25 Parameter Min 2.0 Typ Max 9.5 1.5 +85 Units V KHz C Conditions
Enable/Disable Table
RSW resistor VDD 0V
(See Figure 2)
HV830 Enable Disable
Block Diagram
Lx VDD Cs RSW-osc Enable* Switch Osc
Q
GND Disable
VA + C _
Q
Vref Output Osc
Q
VB REL-osc
Q
* Alternate Enable is available in die form only. 2
HV830
Figure 1: Test Circuit, VIN = 3.0V
ON = VDD OFF = 0V 5.1M
1
1M 220H1 VDD = VIN = 3.0V 0.1F2 0.01F 200V
VDD RSW-osc Cs Lx
REL-osc VA VB GND
8 7 6 5
10 square inch lamp.
2 3
BAS21LT1
4
HV830
1nF
Notes: 1. Murata part # LQH4N221K04 (DC resistance < 5.4) 2. Larger values may be required depending upon supply impedance.
For additional information, see Application Notes AN-H33 and AN-H34.
Enable/Disable Configuration
The HV830 can be easily enabled and disabled via a logic control signal on the RSW and REL resistors as shown in Figure 2 below. The control signal can be from a microprocessor. RSW and REL are typically very high values. Therefore, only 10's of microamperes will be drawn from the logic signal when it is at a logic high (enable) state. When the microprocessor signal is high the device is enabled and when the signal is low, it is disabled.
Figure 2: Enable/Disable Configuration
ON =VDD OFF = 0V Remote Enable REL
1
RSW Lx + VIN = VDD 4.7F 15V
BAS21LT1
VDD RSW-osc Cs Lx
REL-osc VA VB GND
8 7
EL Lamp
2 3 4
CS 200V
6 5
HV830LG
1nF
Split Supply Configuration Using a Single Cell (1.5V) Battery
The HV830 can also be used for handheld devices operating from a single cell 1.5V battery where a regulated voltage is available. This is shown in Figure 3. The regulated voltage can be used to run the internal logic of the HV830. The amount of current necessary to run the internal logic is typically 100A at a VDD of 3.0V. Therefore, the regulated voltage could easily provide the current without being loaded down. The HV830 used in this configuration can also be enabled/disabled via logic control signal on the RSW and REL resistors as shown in Figure 2. 3
Split Supply Configuration for Battery Voltages of Higher than 9.5V
Figure 3 can also be used with high battery voltages such as 12V as long as the input voltage, VDD, to the HV830 device is within its specifications of 2.0V to 9.5V.
HV830
External Component Description
External Component Diode Cs Capacitor REL-osc Selection Guide Line Fast reverse recovery diode, BAS21LT1 or equivalent. 0.01F to 0.1F, 200V capacitor to GND is used to store the energy transferred from the inductor. The EL lamp frequency is controlled via an external REL resistor connected between REL-osc and VDD of the device. The lamp frequency increases as REL decreases. As the EL lamp frequency increases, the amount of current drawn from the battery will increase and the output voltage VCS will decrease. The color of the EL lamp is dependent upon its frequency. A 3.3M resistor would provide lamp frequency of 220 to 280Hz. Decreasing the REL-osc by a factor of 2 will increase the lamp frequency by a factor of 2. RSW-osc The switching frequency of the converter is controlled via an external resistor, RSW between RSW-osc and VDD of the device. The switching frequency increases as RSW decreases. With a given inductor, as the switching frequency increases, the amount of current drawn from the battery will decrease and the output voltage, VCS, will also decrease. A 1nF capacitor is recommended on RSW-osc to GND when a 0.01F CS capacitor is used. This capacitor is used to shunt any switching noise that may couple into the RSW-osc pin. The CSW capacitor may also be needed when driving large EL lamp due to an increase in switching noise. 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 inductor value decreases, the switching frequency of the inductor (controlled by RSW) should be increased to avoid saturation. 220H Murata inductors with 5.4 series DC resistance is typically recommended. For inductors with the same inductance value but with lower series DC resistance, lower RSW value is needed to prevent high current draw and inductor saturation. Lamp 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 (400mW), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation.
CSW Capacitor
Lx Inductor
Figure 3: Split Supply Configuration
ON = VDD OFF = 0V VDD = Regulated Voltage RSW Lx + VIN = Battery Voltage
BAS21LT1
Remote Enable
REL
1 2 3
- 0.1F* CS 200V
VDD RSW-osc Cs Lx
REL-osc VA VB GND
8 7
EL Lamp
6 5
4
HV830LG
1nF
*Larger values may be required depending upon supply impedance.
For additional information, see Application Notes AN-H33 and AN-H34.
11/12/01
(c)2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
4
1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 * FAX: (408) 222-4895 www.supertex.com

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