HV826 High Voltage EL Lamp Driver Ordering Information Package Options Device MSOP-8 SO-8 Die HV826 HV826MG* HV826LG HV826X * Product supplied on 2500 piece carrier tape reels. Features General Description ❏ 1.8V to 3.5V operating supply voltage The Supertex HV826 is a high voltage driver designed for driving EL lamps. The input supply voltage range is from 1.8V to 3.5V. The device uses a single inductor and a minimum number of passive components. The nominal regulated output voltage that is applied to the EL lamp is ±80V. The chip can be enabled/ disabled by connecting the resistor on RSW-OSC to VDD/ground. ❏ DC to AC conversion ❏ Adjustable output frequency ❏ Adjustable switch frequency ❏ Output voltage regulation The HV826 has two internal oscillators, a switching MOSFET, and a high voltage EL lamp driver. The frequency for the switching MOSFET is set by an external resistor connected between the RSW-osc pin and the supply pin VDD. 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 0.01-0.1µF capacitor is connected between CS and ground. The EL lamp is connected between VA and VB. ❏ Enable/disable function Applications ❏ Mobile cellular phones ❏ Pagers The switching MOSFET charges the external inductor and discharges it into the capacitor at CS. The voltage at CS will start to increase. Once the voltage at CS reaches a nominal value of 80V, the switching MOSFET is turned OFF to conserve power. The outputs VA and VB are configured as an H bridge and are switching in opposite states to achieve 160V peak-to-peak across the EL lamp. ❏ Portable Transceivers ❏ Remote Control Units ❏ Calculators Pin Configuration Absolute Maximum Ratings* Supply Voltage, VDD -0.5V to +4.5V Output Voltage, VCs -0.5V to +100V Operating Temperature Range -25° to +85°C ςΑ VDD 1 -65°C to +150°C RSW-osc 2 MSOP-8 Power Dissipation 250mW REL-osc 3 SO-8 Power Dissipation 400mW Gnd 4 Storage Temperature Range Note: *All voltages are referenced to GND. MSOP-8 and SO-8 8 VA 7 VB 6 CS 5 LX Top View 11/12/01 Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, 1 refer to the most current databook or to the Legal/Disclaimer page on the Supertex website. HV826 Electrical Characteristics DC Characteristics (Over recommended operating conditions unless otherwise specified, TA=25°C) Symbol Parameter Min Typ Max Units Conditions 7.0 Ω I=100mA RDS(on) On-resistance of switching transistor VCs Max. output regulation voltage 75 80 85 V VDD=1.8V to 3.5V VA-B Max. of differential output voltage across lamp 150 160 170 V VDD=1.8V to 3.5V IDDQ Quiescent VDD supply current 100 nA RSW-osc = Low IDD Input current going into the VDD pin 150 µA VDD=1.8V to 3.5V. See Figure 1. IIN Input current including inductor current 45 mA VIN=1.5V. See Figure 1. VCS Output voltage on VCS 65 70 V VIN=1.5V. See Figure 1. fEL VA-B output drive frequency 300 375 Hz VIN=1.5V. See Figure 1. fSW Switching transistor frequency 80 KHz VIN=1.5V. See Figure 1. D Switching transistor duty cycle 88 % 35 450 See figure 1. Recommended Operating Conditions Symbol Parameter Min Typ Max Units VDD Supply voltage 1.8 3.5 V fEL VA-B output drive frequency 60 1000 KHz TA Operating temperature -25 85 °C Max Units Conditions Enable/Disable Function Table Symbol Parameter Min Typ Conditions EN-L Logic input low voltage 0 0.5 V VDD=1.8V to 3.5V EN-H Logic input high voltage VDD-0.5 VDD V VDD=1.8V to 3.5V 2 HV826 Block Diagram LX VDD CS RSW Switch Osc Q GND Disable C _ VA Vsen + Q Vref Output Osc Q Rel VB Q Figure 1: Typical Application Enable Signal ON=VDD OFF=0 VDD=3V VDD 1 VDD VA 8 2 RSW-osc VB 7 3 REL-osc CS 6 4 Gnd LX 5 EL Lamp 560K VIN + _ 1.0M 4.7uF 1N4148 LX* 220uH HV826MG or HV826LG 0.1µF 100V Operating VDD voltage: 1.8V to 3.5V EL lamp size: Up to 2.5 in2 Brightness: 3.0 to 5.0ft-lm * LX = Murata LQH4N221K04 Typical Performance Device Lamp Size VIN IIN VCS fEL Brightness TA HV826MG 1.6 in2 1.5V 35mA 66V 345Hz 5.0ft-lm -25°C to +85°C 3 HV826 Typical Performance Curves for Figure 1 (1.6 in.2 lamp) IIN vs. VIN 40 100 80 60 40 20 0 IIN (mA) 30 20 10 0 1 2 3 1 4 2 Brightness vs. VIN 4 80 90 IIN vs. VCS 40 6 30 IIN (mA) 8 4 2 0 20 10 0 1 2 3 4 60 70 VIN (V) VCS (V) IIN, VCS, Brightness vs. Inductor Value = 3.0V Vin = 1.5V VVdd VIN = 1.5V DD = 3.0V 90 6.0 80 IIN (mA), VCS (V) Brightness (ft-lm) 3 VIN (V) VIN (V) 5.0 70 60 4.0 50 40 3.0 30 2.0 20 1.0 10 0 0.0 100 220 330 Inductor Value (µH) 4 560 900 Brightness (ft-lm) VCS (V) VCS vs. VIN HV826 Figure 2: Typical Application Figure 2: VIN=3.0V=VDD Enable Signal ON=VDD OFF=0 Equivalent to 3 inch2 lamp 2.0K 1 VDD VA 8 2 RSW-osc VB 7 3 REL-osc CS 6 4 Gnd LX 5 10nF 750K VIN=VDD + _ 2.0M 4.7uF 1N4148 LX* 560uH HV826MG/LG 0.01µF 100V Operating VDD voltage: 1.8V to 3.5V EL lamp size: Up to 4.5 in2 Brightness: 3.0 to 5.0ft-lm * LX = Murata LQH4N561K04 Typical Performance Device Lamp Size VDD IDD VCS fEL Brightness TA HV826MG 3.0 in2 3.0V 23mA 80V 195Hz 4.0ft-lm -25°C to +85°C 5 HV826 Typical Performance Curves for Figure 2 (3.0 in.2 lamp) IIN vs. VIN 100 80 60 40 20 0 IIN (mA) VCS (V) VCS vs. VIN 1 2 3 25 20 15 10 5 0 1 4 2 IIN vs. VCS 5 4 3 2 1 0 IIN (mA) Brightness (ft-lm) Brightness vs. VIN 2 4 VIN (V) VIN (V) 1 3 3 25 20 15 10 5 0 4 50 60 VIN (V) 70 80 90 VCS (V) IIN, VCS, Brightness vs. Inductor Value 5.0 90 Brightness (ft-lm) 70 4.0 V CS (V) 60 3.0 50 40 2.0 30 IIN (mA) 20 Brightness (ft-lm) IIN (mA), VCS (V) 80 1.0 10 0 0.0 100 330 470 560 900 Inductor Value (µH) 11/12/01 ©2001 Supertex Inc. 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