High Voltage Noise Inductorless Lamp Driver external components r

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HV850
High Voltage Noise Inductorless Lamp Driver
external components required when using external clock frequency frequency external resistor Noise converter Drives 4.5nF load (approx. inches) Output voltage regulation Enable function
General Description
Supertex HV850 high voltage electroluminescent (EL) Lamp Driver designed drive lamps 2.0in2, with capacitive values 4.5nF. HV850 converts voltage input high voltage output across lamp. uses charge pump scheme boost input voltage eliminating need external inductor, diode, high voltage capacitor commonly found conventional topologies. charge pump circuit discharges energy into lamp through high voltage H-bridge. Once voltage reaches regulated limit, turned conserve power. lamp then discharged ground H-bridge changes state allow charge pump charge lamp opposite direction. lamp frequency either external resistor applying external clock where clock frequency divided lamp frequency.
Applications
Cell phone keypads displays Transceivers Players Watches Pagers Measuring instruments/gauges
Typical Application Circuits
VDD=ON
VDD=ON GND=OFF
GND=OFF
Clk-in
Clk-en
Clk-in
Clk-en
Lamp
Lamp
HV850MG
HV850MG
lamp frequency external clock
lamp frequency
Supertex, Inc.
1/21/04
HV850
Ordering Information
Device HV850 Package MSOP-8 HV850MG* HV850X
Configuration
Clk-in MSOP (top View) Clk-en
*Product supplied 2500 piece Carrier Tape Reels.
Absolute Maximum Ratings*
Vdd, Supply Voltage Operating Temperature Storage Temperature Power Dissipation MSOP-8 -0.5V 4.5V -25°C +85°C -65°C +150°C 300mW
*Absolute Maximum Ratings those values beyond which damage device occur. Functional operation under these conditions implied. Continuous operation device absolute rating level affect device reliability. voltages referenced device ground.
Electrical Characteristics (unless otherwise specified:
Symbol IDDQ VA-VB VA-VB trout Parameter Quiescent current Peak output voltage Peak Peak output voltage lamp frequency Operating current Peak output voltage Peak Peak output voltage lamp frequency Output voltage rise time
3.5V) Units Conditions EN=0V load. REL=1.65M CLK=32KHz Figure VDD=3.5V, 68.5 REL=1.5M, Load=3.3nF+1K fEL=250Hz, 1in2 lamp, final value
Logic Inputs
Symbol ENrise ENfall Parameter Input logic voltage Input logic high voltage Input logic current Input logic high current Enable input rise time (for delay turn off) Enable input fall time (for delay turn off) Logic input capacitance Units Conditions
0.01
Using external circuit, Figure
Recommended Operating Conditions
Symbol freq Cload Parameter Input voltage lamp frequency lamp capacitance Operating Temperature Units Conditions
Supertex, Inc.
1/21/04
HV850
Typical Output Waveform
Vdd=3.5V, Fel=250.0Hz; Load=3.3nF+1 kohm; Idd=9.19mA, 20V/div, 1mS/div
Block Diagram
Capacitor Charge Circuit
Vsense High Voltage Level Translators
Feedback
Clk-in Clk-en
Oscillator
Full Bridge
Supertex, Inc.
1/21/04
HV850
Description
Clk-in Clk-en Description Input supply voltage pin. external resistor will lamp frequency. Enable input pin. Logic high will turn device external circuit added delayed turn off. Logic input pin. external logic clock applied this used lamp frequency (see Figure This useful applications requiring lamp synchronized system clock. Connect ground when use. Logic input pin. Logic high will cause lamp frequency Clk-in input. Logic will cause lamp frequency external resistor. ground pin. lamp driver output pin. lamp connected across terminals. lamp driver output pin. lamp connected across terminals.
Figure Typical Applications
VDD=ON GND=OFF
Lamp
Clk-in
Clk-en
HV850MG
Note: Cdd=2.2µF, 6.3V Load 3.3nF+1K 1.5M 3.0V 3.5V 4.0V 8.9mA 10.2mA 10.4mA Peak 294Hz
Additional Examples
Lamp Size 1.0in2 0.5in2 1.0in2 0.5in2 1.0in2 1.65M 2.0M 3.3M 3.3M 4.7M 3.0V 3.5V 4.0V 3.0V 3.5V 4.0V 3.0V 3.5V 4.0V 3.0V 3.5V 4.0V 3.0V 3.5V 4.0V 8.4mA 9.4mA 9.9mA 5.5mA 5.3mA 4.9mA 5.6mA 5.4mA 5.0mA 4.6mA 4.1mA 3.8mA 4.8mA 4.4mA 5.0mA Peak 250Hz 210Hz 128Hz 128Hz 89Hz Brightness 7.31cd/m2 10.35cd/m2 12.62cd/m2 11.54cd/m2 14.33cd/m2 14.90cd/m2 8.55cd/m2 10.29cd/m2 10.94cd/m2 8.25cd/m2 9.62cd/m2 9.95cd/m2 6.02cd/m2 7.50cd/m2 10.94cd/m2
Supertex, Inc.
1/21/04
HV850
Figure Push Button Turn with Delay Turn
Push button turn
Clk-en
Lamp
Clk-in
850MG
time constant will Turn Delay time
Figure Independent Programmable Output Frequency (fEL)
DD=ON
GND=OFF
Clk-en
Clk-in
Lamp
HV850MG
Supertex, Inc.
1/21/04
HV850
1/20/04natfrev15
Supertex, Inc.
2004 Supertex Inc. rights reserved. Unauthorized reproduction prohibited.
1235 Bordeaux Drive, Sunnyvale, 94809 TEL: (408) 222-8888 FAX: (408) 222-4895 1/21/04 www.supertex.com

High Voltage Noise Inductorless Lamp Driver external components r

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