HV825_07 SUTEX | Alldatasheet
Document overview
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Technical content
Features
Processed with HVCMOS® 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
Applications
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 R SW-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 0.1µF, 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 0.1µF, 100V capacitor at the CS pin. The volt- age at the CS pin will start to increase. The outputs VA and VB are confi gured as an H-bridge and are switching in opposite states to achieve a peak-to-peak voltage of two times the V CS voltage across the EL lamp. HV825 Block Diagram GND VDD REL-Osc VA CS LX VB RSW-Osc Switch Osc Output Osc Q Q Q Q High Voltage EL Lamp Driver IC
HV825 HV825LG HV825LG-G HV825MG HV825MG-G -G indicates package is RoHS compliant (‘Green’) Absolute Maximum Ratings Parameter Value Supply voltage, VDD 0.5V to +2.5V Operating Temperature Range -25°C to +85°C Storage Temperature Range -65°C to +150°C MSOP-8 Power Dissipation 300mW SO-8 Power Dissipation 400mW Symbol Parameter Min Typ Max Units Conditions
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specifi ed - TA=25°C) 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. RDS(ON) On-resistance of switching transistor - - 15 Ω I = 50mA IIN VDD supply current (including inductor current) -3 0 3 8 m A V DD=1.5V. See test circuit IDDQ Quiescent V DD supply current - - 1.0 μA R SW-osc = GND VCS Output voltage on VCS 52 56 68 V V DD = 1.5V. See test circuit VA-B Differential output voltage across lamp 104 112 136 V V DD = 1.5V. See test circuit fEL VA-B output drive frequency 400 - - Hz V DD = 1.5V. See test circuit fSW Switching transistor frequency - 30 - KHz V DD = 1.5V. See test circuit D Switching transistor duty cycle - 88 - % --- Recommended Operating Conditions VDD Supply voltage 1.0 - 1.6 V --- CL Load Capacitance 0 6.0 - nF --- TA Operating temperature -25 - +85 OC --- Enable/Disable Table VIL Low level input voltage to RSW-osc resistor 0 - 0.2 V V DD = 1.0V-1.6V VIH High level input voltage to R SW-osc re- sistor VDD-0.5 - V DD VV DD = 1.0V-1.6V Pin Confi guration LX CS RSW-Osc VDD REL-Osc VA VB GND 4 5 HV825 (top view)
Ordering Information
VDD = VIN = 1.0V - 1.6V 0.01µF 100V CSW 1nF 560µH1 1N4148 750KΩ 1MΩ 2.2KΩ 4.7nF ON = VDD OFF = GND 0.1µF Equivalent to 1.5in2 lamp HV825LG or HV825MG 5LX GND VB VA REL-OscVDD RSW-Osc CS Enable External Component Selection Guide Line Diode Fast reverse recovery, 1N4148 or equivalent. CS Capacitor 0.01 to 0.1µF, 100V capacitor to GND is used to store the energy transferred from the inductor. REL-Osc Resistor The lamp frequency is controlled via the R EL-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 V CS will decrease. This is because the lamp will draw more current from V CS 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. R SW-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. LX Inductor The inductor L X 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 C S. 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 R SW-Osc) should be increased to avoid saturation. The test circuit uses a Murata (LQH4N561) 560µH inductor. Using different inductor values or induc- tors from different manufacturers will affect the performance. As the inductor value decreases, smaller R SW-Osc values should be used. This will prevent inductor saturation. An inductor with the same inductance value, (560µH), 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. External Component Description Typical Performance Lamp Size V IN IDD VCS fEL Brightness 1.5in2 1.5V 30mA 56V 450Hz 3.65ft-lm Notes: 1. Murata part # LQH4N561K04 (DC resistance < 14.5Ω)
8-Lead SOIC (Narrow Body) Package (LG) 45° 5° - 15° (4 PLCS) 4.90 ± 0.10 1.27BSC 6.00 ± 0.20 3.90 ± 0.10 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. Note 2
1.75 MAX
1.25 MIN
0.25 - 0.50 0° - 8° 0.40 - 1.27 0.17 - 0.25 Top View Side View End View Note 2
Doc.# DSFP-HV825 A111306 HV825 (The package drawing(s) in this data sheet may not refl ect the most current specifi cations. For the latest package outline information go to http://www.supertex.com/packaging.html.) Seating Plane Gauge Plane θL E D e b A A2 Seating Plane A A Top View Side View View A-A View B View B θ1 (x4) Note 1 (Index Area D1/2 x E1/2) Symbol A A1 A2 b D E E1 e L L1 L2 θ θ1 Dimen- sion (mm) 0.65 BSC 0.40 0.95 REF 0.25 BSC 0O 5O JEDEC Registration MO-187, Variation AA, Issue E, Dec. 2004. Drawings not to scale. Note 1: A Pin 1 identifi er must be located in the index area indicated. The Pin 1 identifi er may be either a mold, or an embedded metal or marked feature. 8-Lead MSOP Package Outline (MG) 3x3mm body, 1.10mm height (max), 0.65mm pitch