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HV850 Dataheets PDF



Part Number HV850
Manufacturers Supertex
Logo Supertex
Description Inductorless EL Lamp Driver
Datasheet HV850 DatasheetHV850 Datasheet (PDF)

Supertex inc. HV850 High Voltage, Low Noise, Inductorless EL Lamp Driver Features ►► No external components required when using an external EL clock frequency ►► EL frequency can be set by an external resistor ►► Low noise ►► DC to AC converter ►► Drives up to 5.0nF load (approx. 1.5in2 lamp) ►► Output voltage regulation ►► Enable function ►► EL Lamp dimming Applications ►► Cell phone keypads and displays ►► Transceivers ►► MP3 players ►► Watches ►► Pagers ►► Measuring instruments/gauges Gen.

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Supertex inc. HV850 High Voltage, Low Noise, Inductorless EL Lamp Driver Features ►► No external components required when using an external EL clock frequency ►► EL frequency can be set by an external resistor ►► Low noise ►► DC to AC converter ►► Drives up to 5.0nF load (approx. 1.5in2 lamp) ►► Output voltage regulation ►► Enable function ►► EL Lamp dimming Applications ►► Cell phone keypads and displays ►► Transceivers ►► MP3 players ►► Watches ►► Pagers ►► Measuring instruments/gauges General Description The Supertex HV850 is a high voltage electroluminescent (EL) Lamp Driver IC. It is designed to drive EL lamps of up to 1.5in2, with capacitive values up to 5.0nF. The HV850 converts a low voltage DC input to a high voltage AC output across an EL lamp. It uses a charge pump scheme to boost the input voltage, eliminating the need for external inductors, diodes, and high voltage capacitors, components commonly found in conventional topologies. The charge pump circuit discharges its energy into an EL lamp through a high voltage H-bridge. Once the voltage reaches its regulated limit, it is turned off to conserve power. The EL lamp is then discharged to ground and the H-bridge changes state to allow the charge pump to charge the EL lamp in the opposite direction. The EL lamp frequency can be set either by an external resistor, REL, or by applying an external clock, where the clock frequency is divided by 128 to set the EL lamp frequency. Typical Application Circuits (For VDD = 3.4V to 4.2V only) VDD = ON GND = OFF + VDD - CDD VDD GND 1 VDD VA 8 HV850 2 REL VB 7 3 EN GND 6 4 CLKIN CLKEN 5 EL lamp frequency set by an external clock EL Lamp VDD + VDD CDD - VDD = ON GND = OFF 1 VDD VA 8 REL HV850 2 REL VB 7 3 EN GND 6 4 CLKIN CLKEN 5 EL Lamp EL lamp frequency set by REL Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com HV850 Ordering Information Package Options Device 8-Lead MSOP 3.00x3.00mm body 1.10mm height (max) 0.65mm pitch HV850 HV850MG-G -G indicates package is RoHS compliant (‘Green’) Pin Configuration VDD 1 REL 2 EN 3 CLKIN 4 8 VA 7 VB 6 GND 5 CLKEN 8-Lead MSOP (MG) (top view) Absolute Maximum Ratings Parameter Value VDD, supply voltage Operating temperature -0.5V to 4.5V -25°C to +85°C Storage temperature -65°C to +150°C Power dissipation 300mW Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Product Marking Top Marking H850 LLLL L = Lot Number YY = Year Sealed Bottom Marking WW = Week Sealed YYWW = “Green” Packaging Package may or may not include the following marks: Si or 8-Lead MSOP (MG) Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions VDD fEL CLOAD TA Input voltage EL lamp frequency EL lamp capacitance Operating temperature 3.0 - 4.2 V --- 50 - 500 Hz --- 0 - 5.0 nF --- -25 - +85 OC --- Electrical Characteristics (Unless otherwise specified VDD = 3.5V, TA = 25°C) Sym Parameter Min Typ Max Units Conditions IDDQ Quiescent current - - 150 VA or VB Peak output voltage 63 70 77 VA - VB Peak to peak output voltage 126 140 154 fEL EL lamp frequency 225 250 275 IDD Operating current - - 16 VA or VB Peak output voltage 54 - 74 VA - VB Peak to peak output voltage 108 - 148 fEL EL lamp frequency 250 294 338 tROUT Output voltage rise time 1.5 - - nA EN = 0V V No load. V Hz REL = 1.65MΩ or CLK = 32kHz mA V See Figure 1, VDD = 3.5V, V REL = 1.5MΩ, Load = 3.3nF + 1.0kΩ Hz ms fEL= 250Hz, 1in2 lamp, 10 to 90% of final value Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 2 HV850 Logic Inputs (Unless otherwise specified VDD = 3.5V, TA = 25°C) Sym Parameter Min Typ Max VIL VIH IIL IIH ENRISE ENFALL Input logic low voltage Input logic high voltage Input logic low current Input logic high current Enable input rise time (for delay turn on) Enable input fall time (for delay turn off) 02.0 - --0.01 - 10µ - 0.5 VDD 1.0 1.0 10 5.0 CIN Logic input capacitance - - 10 Units V V µA µA Conditions --------- ms Using external R-C circuit, see Figure 2. s pF --- Block Diagram VDD EN CLKIN CLKEN REL VDD Capacitor Charge Pump Circuit VSENSE Feedback VDD EL Oscillator GND High Voltage Level Translators VA VB MOSFET Full Bridge Figure 1: Typical Application Circuit (without Enable function) + VDD 1 VDD VA 8 CDD REL HV850 2 REL VB 7 - 3 EN GND 6 4 CLKIN CLKEN 5 EL Lamp Load REL VDD IDD Peak VA fEL (MΩ) (V) (mA) (V) (Hz) 3.0 8.9 53 3.3nF + 1.0kΩ 1.5 3.5 10.2 61 294 Note: CDD = 2.2µF, 6.3V low ESR 4.0 10.4 66 Supertex inc. ● 1235 Bord.


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