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| HV825 High Voltage EL Lamp Driver IC Features Processed with HVCMOS(R) technology 1.0V to 1.6V operating supply voltage DC to AC conversion Output load of typically up to 6nF Adjustable output lamp frequency Adjustable converter frequency Enable function General Description The Supertex HV825 is a high voltage driver designed for driving EL lamps typically up to 6nF. The input supply voltage range is from 1.0V to 1.6V. The device uses a single inductor and a minimum number of passive components. The typical output voltage that can be applied to the EL lamp is 56V. The HV825 can be enabled/disabled by connecting the RSW-Osc resistor to VDD/GND. The HV825 has two internal oscillators, a switching bipolar junction transistor (BJT), and a high voltage EL lamp driver. The frequency for the switching BJT is set by an external resistor connected between the RSW-Osc pin and the VDD supply pin. 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 0.01 to 0.1F, 100V capacitor is connected between the CS pin and the GND pin. The EL lamp is connected between the VA pin and the VB pin. The switching BJT charges the external inductor and discharges it into the 0.01 to 0.1F, 100V capacitor at the CS pin. The voltage at the CS pin will start to increase. The outputs VA and VB are configured as an H-bridge and are switching in opposite states to achieve a peak-to-peak voltage of two times the VCS voltage across the EL lamp. Applications Pagers Portable Transceiver Cellular phones Remote control units Calculators HV825 Block Diagram LX VDD CS RSW-Osc Switch Osc Q VA GND Q Output Osc Q VB REL-Osc Q HV825 Ordering Information Device HV825 Package Options 8-Lead SO HV825LG HV825LG-G 8-Lead MSOP HV825MG HV825MG-G -G indicates package is RoHS compliant (`Green') Absolute Maximum Ratings Parameter Supply voltage, VDD Operating Temperature Range Storage Temperature Range MSOP-8 Power Dissipation SO-8 Power Dissipation Value 0.5V to +2.5V -25C to +85C -65C to +150C 300mW 400mW Pin Configuration VDD RSW-Osc CS LX 1 2 3 4 8 7 6 5 REL-Osc VA VB GND Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. HV825 (top view) Electrical Characteristics DC Characteristics (Over recommended operating conditions unless otherwise specified Symbol RDS(ON) IIN IDDQ VCS VA-B fEL fSW D Parameter On-resistance of switching transistor VDD supply current (including inductor current) Quiescent VDD supply current Output voltage on VCS Differential output voltage across lamp VA-B output drive frequency Switching transistor frequency Switching transistor duty cycle Min 52 104 400 Typ 30 56 112 30 88 Max 15 38 1.0 68 136 - TA=25C) Units mA A V V Hz KHz % Conditions I = 50mA VDD=1.5V. See test circuit RSW-osc = GND VDD = 1.5V. See test circuit VDD = 1.5V. See test circuit VDD = 1.5V. See test circuit VDD = 1.5V. See test circuit --- Recommended Operating Conditions VDD CL TA Supply voltage Load Capacitance Operating temperature 1.0 0 -25 6.0 1.6 +85 V nF O ------- C Enable/Disable Table VIL VIH Low level input voltage to RSW-osc resistor High level input voltage to RSW-osc resistor 0 VDD-0.5 0.2 VDD V V VDD = 1.0V-1.6V VDD = 1.0V-1.6V 2 HV825 Test Circuit ON = VDD OFF = GND Enable 1M 1 750K 560H1 2 3 4 0.01F 100V CSW 1nF VDD REL-Osc VA VB GND 8 2.2K 7 6 5 Equivalent to 1.5in2 lamp RSW-Osc CS LX 4.7nF VDD = VIN = 1.0V - 1.6V 0.1F 1N4148 HV825LG or HV825MG Typical Performance Lamp Size 1.5in2 VIN 1.5V IDD 30mA VCS 56V fEL 450Hz Brightness 3.65ft-lm Notes: 1. Murata part # LQH4N561K04 (DC resistance < 14.5) External Component Description External Component Diode CS Capacitor REL-Osc Resistor Selection Guide Line Fast reverse recovery, 1N4148 or equivalent. 0.01 to 0.1F, 100V capacitor to GND is used to store the energy transferred from the inductor. The lamp frequency is controlled via the REL-Osc. The lamp frequency increases as the REL-Osc decreases. As the lamp frequency increases, the amount of current drawn from the battery will increase and the output voltage VCS will decrease. This is because the lamp will draw more current from VCS when driven at higher frequencies. In general, as the lamp size increases, a larger REL-Osc is recommended to provide higher VCS. However, the color of the lamp is dependent upon its frequency and the shade of the color will change slightly with different frequencies. RSW-Osc Resistor The switching frequency of the inductor is controlled via the RSW-Osc. The switching frequency increases as the RSW-Osc decreases. As the switching frequency increases, the amount of current drawn from the battery will decrease and the output voltage VCS will also decrease. The inductor LX is used to boost up the low input voltage. When the internal switch is on, the inductor is being charged. When the internal switch is off, the charge 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 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-Osc) should be increased to avoid saturation. The test circuit uses a Murata (LQH4N561) 560H inductor. Using different inductor values or inductors from different manufacturers will affect the performance. As the inductor value decreases, smaller RSW-Osc values should be used. This will prevent inductor saturation. An inductor with the same inductance value, (560H), but lower series resistance, will charge faster. The RSW-Osc resistor value needs to be decreased to prevent inductor saturation and high current consumption. CSW Capacitor A 1nF capacitor is recommended from RSW-Osc pin to GND. This capacitor is used to shunt any switching noise that may couple into the RSW-Osc pin. LX Inductor 3 HV825 8-Lead SOIC (Narrow Body) Package (LG) 4.90 0.10 8 6.00 0.20 3.90 0.10 Note 2 Notes: 1. All dimensions in millimeters. Angles in degrees. 2. If the corner is not chamfered, then a Pin 1 identifier must be located within the area indicated. 1 Top View 0.17 - 0.25 1.75 MAX 1.25 MIN 5 - 15 (4 PLCS) 45 0.25 - 0.50 Note 2 0 - 8 0.10 - 0.25 1.27BSC 0.40 - 1.27 0.31 - 0.51 Side View End View 4 HV825 8-Lead MSOP Package Outline (MG) 3x3mm body, 1.10mm height (max), 0.65mm pitch D 8 1 (x4) E E1 Note 1 (Index Area D1/2 x E1/2) L L2 Gauge Plane 1 L1 Seating Plane Top View A View B View B A A2 Seating Plane A1 e b A Side View View A-A Note 1: A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier may be either a mold, or an embedded metal or marked feature. Symbol Dimension (mm) MIN NOM MAX A 0.75 1.10 A1 0.00 0.15 A2 0.75 0.85 0.95 b 0.22 0.38 D 2.80 3.00 3.20 E 4.65 4.90 5.15 E1 2.80 3.00 3.20 e 0.65 BSC L 0.40 0.60 0.80 L1 0.95 REF L2 0.25 BSC 0 O 1 5O 15O 8O JEDEC Registration MO-187, Variation AA, Issue E, Dec. 2004. Drawings not to scale. (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.) Doc.# DSFP-HV825 A111306 5 |
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