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HV824
Advanced Information
High Voltage EL Lamp Driver
Ordering Information
Package Options Device HV824 Input Voltage 1.0V to 1.6V 8-Lead SO HV824LG Die HV824X
Features
Processed with HVCMOS(R) technology 1.0V to 1.6V supply voltage DC to AC conversion 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
General Description
The Supertex HV824 is a high voltage driver designed to drive EL lamps with capacitive loads of 2nF to 15nF. The input supply voltage range is 1.0V to1.6V. The device uses a single inductor and a minimum number of passive components. Typical output voltage applied to the EL lamp is 120V to 150V peak-to-peak. The HV824 can be enabled/disabled by connecting the R SW resistor to VDD/ground. In die form, the device has an enable bar pad which enables the IC when it is at logic low. The HV824 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 VDD pin. The EL lamp driver frequency is set by an external resistor connected between the 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 pins. The EL lamp is connected between VA and VB. The switching MOSFET charges the external inductor and discharges it into the 0.01F to 0.1F capacitor at Cs. The voltage at CS will start to increase. Once the voltage at Cs reaches a nominal value of 75V, 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 a maximum voltage of 180V peak-to-peak across the EL lamp.
Applications
Pagers Portable Transceiver Portable Instrumentation Cellular Phones
Absolute Maximum Ratings*
Supply Voltage, VDD Output Voltage, VCs Operating Temperature Range Storage Temperature Range Power Dissipation
Note: *All voltages are referenced to GND.
Pin Configuration
VDD RSW-osc REL-osc GND
1 2 3 4
8 7 6 5
-0.5V to +2.0V -0.5V to +120V -25C to +85C -65C to +150C 400mW VA VB CS LX
SO-8 top view
15-25
HV824
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified, TA = 25C)
Symbol IDDQ IDD IIN VP-P fEL D CLOAD Parameter Quiescent VDD supply current Input current going into the VDD pin Input current including inductor current. Output voltage peak-to-peak VA-B output drive frequency Switching transistor duty cycle EL panel capacitance load range 2.0 140 130 300 333 88 15 Hz % nF 150 Min Typ 50 Max 100 450 70 160 Units nA A mA V Conditions RSW-osc=Low VDD=1.5V. VDD=1.5V. See Figure 1. VDD=1.5V. See Figure 1. VDD=1.0V. See Figure 1. VDD=1.5V. See Figure 1.
Recommended Operating Conditions
Symbol VDD TA Supply voltage Operating temperature Parameter Min 1.0 -25 Typ Max 1.6 85 Units V C Conditions
Enable/Disable Table
Symbol VIL VIH Parameter Low level input voltage to RSW resistor High level input voltage to RSW resistor Min 0 VDD-0.5 Typ Max 0.2 VDD Units V V Conditions VDD=1.0V to 1.6V. VDD=1.0V to 1.6V.
15-26
HV824
Block Diagram
Lx VDD Cs RSW Enable * Switch Osc 75V
Q
GND
VA + C _
Q
0.7V Output Osc
Q
VB REL-osc
Q
* Enable pad is available in die form only.
Typical Application
ON = VDD OFF = 0
Enable Signal
1
RSW
VDD RSW-osc REL-osc GND
VA VB CS LX
8
EL Lamp
2
+
7 6
IN4148
REL
VDD
-
3 4
5
LX
HV824LG
CS
Typical Performance
Lamp Size 1.5in2 VIN IIN VCS 75V fEL 333Hz Brightness 5.0ft-lm 1.0V-1.5V 70mA
15-27

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