external components required when using external clock frequency frequ

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external components required when using external clock frequency frequ

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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 5.0nF load (approx. 1.5in2 lamp) Output voltage regulation Enable function Lamp dimming
Supertex HV850 high voltage electroluminescent (EL) Lamp Driver designed drive lamps 1.5in2, with capacitive values 5.0nF. HV850 converts voltage input high voltage output across lamp. uses charge pump scheme boost input voltage, eliminating need external inductors, diodes, high voltage capacitors, components 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, REL, applying external clock, where clock frequency divided lamp frequency.
Applications
Cell phone keypads displays Transceivers players Watches Pagers Measuring instruments/gauges
Typical Application Circuits (For 3.4V 4.2V only)
CLKIN
CLKEN
Lamp
lamp frequency external clock
HV850MG
CLKIN
CLKEN
Lamp
lamp frequency
HV850MG
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com
HV850
Ordering Information
Package Options Device HV850
3.00x3.00mm body 1.10mm height (max) 0.65mm pitch
Configuration
CLKIN (top view) CLKEN
8-Lead MSOP
HV850MG-G
indicates package RoHS compliant (`Green')
8-Lead MSOP (MG)
Product Marking Absolute Maximum Ratings
Parameter VDD, supply voltage Operating temperature Storage temperature Power dissipation Value -0.5V 4.5V -25°C +85°C -65°C +150°C 300mW
Marking
H850 LLLL
Bottom Marking
YYWW
Number Year Sealed Week Sealed "Green" Packaging
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
Package include following marks:
8-Lead MSOP (MG)
Recommended Operating Conditions
CLOAD IDDQ tROUT Parameter Input voltage lamp frequency lamp capacitance Operating temperature
Units
Conditions
Electrical Characteristics (Unless otherwise specified
Parameter Quiescent current Peak peak output voltage lamp frequency Operating current Peak peak output voltage lamp frequency Output voltage rise time
3.5V, 25°C)
Units
Conditions load. 1.65M 32kHz Figure 3.5V, 1.5M, Load 3.3nF 1.0k fEL= 250Hz, 1in2 lamp, final value
Peak output voltage
Peak output voltage
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com
HV850
Logic Inputs (Unless otherwise specified
ENRISE ENFALL Parameter Input logic voltage Input logic high voltage Input logic current Input logic high current Enable input rise time (for delay turn Enable input fall time (for delay turn off) Logic input capacitance
3.5V, 25°C)
0.01
Units
Conditions -Using external circuit, Figure
Block Diagram
Capacitor Charge Pump Circuit
VSENSE
High Voltage Level Translators
Feedback
CLKIN CLKEN
Oscillator
MOSFET Full Bridge
Figure Typical Application Circuit (without Enable function)
CLKIN
CLKEN
Lamp
HV850MG
Load
(mA)
Peak
(Hz)
3.3nF 1.0k
Note: 2.2µF, 6.3V
10.2 10.4
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com
HV850
Typical Performance
Lamp Size
(in2)
(mA)
Peak
(Hz)
Brightness
(cd/m2)
1.65
7.31 10.35 12.62 11.54 14.33 14.90 8.55 10.29 10.94 8.25 9.62 9.95 6.02 10.94
Typical Output Waveform
3.5V, 250.0Hz; Load 3.3nF+1k; 9.19mA, 20V/div, 1mS/div
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com
HV850
Figure Push Button Turn with Delay Turn (For 3.4V 4.2V only)
Push button turn
CLKEN
Lamp
CLKIN
HV850MG
time constant will Turn Delay time
Figure Independent Programmable Output Frequency (fEL) (For 3.4V 4.2V only)
CLKEN
CLKIN
Lamp
HV850MG
Lamp Dimming Using
lamp dimming achieved applying signal ENABLE pin. signal duty cycle proportional lamp brightness. This done pulse skipping output pulses. frequency should kept below frequency above 50Hz avoid flickering.
Figure Dimming Circuit (For 3.4V 4.2V only)
CLKIN
CLKEN
Lamp
Signal
HV850MG
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com
HV850
Description
Description Input supply voltage pin. external resistor will lamp frequency. lamp frequency inversely proportional resistor value. Enable input pin. Logic high will turn device external circuit added delayed turn off. Logic will turn device only 3.4V 4.2V. lower than 3.4V, logic will turn device 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 CLKIN 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.
CLKIN CLKEN
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com
HV850
8-Lead MSOP Package Outline (MG)
Note (Index Area E1/2)
3.00x3.00mm body, 1.10mm height (max), 0.65mm pitch
(x4)
Gauge Plane
Seating Plane
View
View
View
Seating Plane
Side View
View
Note: identifier must located index area indicated. identifier molded mark/identifier; embedded metal marker; printed indicator.
Symbol Dimension (mm)
0.75* 1.10
0.00 0.15
0.75 0.85 0.95
0.22 0.38
2.80* 3.00 3.20*
4.65* 4.90 5.15*
2.80* 3.00 3.20*
0.65
0.40 0.60 0.80
0.95
0.25
JEDEC Registration MO-187, Variation Issue Dec. 2004. This dimension specified JEDEC drawing. Drawings scale. Supertex Doc. DSPD-8MSOPMG, Version H041309.
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information
Supertex inc. does recommend products life support applications, will knowingly sell them such applications unless receives adequate "product liability indemnification insurance agreement." Supertex inc. does assume responsibility devices described, limits liability replacement devices determined defective workmanship. responsibility assumed possible omissions inaccuracies. Circuitry specifications subject change without notice. latest product specifications refer Supertex inc. website: http//www.supertex.com.
©2009 rights reserved. Unauthorized reproduction prohibited.
Doc.# DSFP-HV850 D062209
1235 Bordeaux Drive, Sunnyvale, 94089 Tel: 408-222-8888 www.supertex.com

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