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| LETE - - OBSO High-Voltage EL Lamp Driver Ordering Information Package Options Device HV803 Input Voltage 2.4V to 9.5V 8-Lead SO HV803LG Die HV803X HV803 Features Processed with HVCMOS(R) technology 2.4V to 9.5V operating supply voltage DC to AC conversion 180V peak-to-peak typical output voltage Large output load capability typically 30nF Short circuit protection on outputs Adjustable output lamp frequency to control lamp color, lamp life, and power consumption Adjustable converter frequency to eliminate harmonics and optimize power consumption Enable/disable function Low current draw under no load condition General Description The Supertex HV803 is a high-voltage driver designed for driving EL lamps of up to 30nF. EL lamps greater than 30nF can be driven for applications not requiring high brightness. The input supply voltage range is from 2.4 to 9.5V. 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 90V. The chip can be enabled by connecting the resistors on RSW-osc and REL-osc to VDD and disabled when connected to GND. The HV803 has two internal oscillators, a switching MOSFET, and a high-voltage EL lamp driver. The frequency for the switching converter 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 0.01F to 0.1F capacitor is connected between CS and GND pins. The EL lamp is connected between VA and VB pins. The switching MOSFET charges the external inductor and discharges it into the Cs capacitor. The voltage at Cs will start to increase. Once the voltage at Cs reaches a nominal value of 90V, the switching MOSFET is turned OFF to conserve power. The outputs VA and VB are configured as an H-bridge and are switched in opposite states to achieve 180V peak-to-peak across the EL lamp. Applications Pagers Cellular phones Electronic personal organizers GPS units Handheld personal computers Portable instrumentation 15 Pin Configuration Absolute Maximum Ratings* Supply Voltage, VDD Output Voltage, VCs Operating Temperature Range Storage Temperature Range Power Dissipation Note: *All voltages are referenced to GND. VDD RSW-osc Cs Lx 1 2 3 4 8 7 6 5 REL-osc VA VB GND -0.5V to +10V -0.5V to +120V -25C to +85C -65C to +150C 400mW SO-8 15-1 HV803 Electrical Characteristics DC Characteristics (VIN = 3.0V, RSW = 750K, REL = 2.0M, TA = 25C unless otherwise specified) Symbol RDS(on) VCS VA - VB IDDQ IDD Parameter On-resistance of switching transistor Output voltage VCS Regulation Output peak to peak voltage Quiescent VDD supply current, disabled Input current going into the VDD pin 80 160 Min Typ 3.5 90 180 Max 8.0 100 200 2.0 100 300 500 IIN VCS fEL fSW D Input current including inductor current Output voltage on VCS VA-B output drive frequency Switching transistor frequency Switching transistor duty cycle 45 300 50 88 35 70 430 90 Units V V A A A A mA V Hz KHz % I = 100mA VIN = 2.4 to 9.5V VIN = 2.4V to 9.5V RSW-osc = GND VIN = 3.0V 5%. See Figure 1. VIN = 5.0V 5%. See Figure 2. VIN = 9.0V 5%. See Figure 3. VIN = 3.0V. See Figure 1. VIN = 3.0V. See Figure 1. VIN = 3.0V. See Figure 1. VIN = 3.0V. See Figure 1. Conditions Recommended Operating Conditions Symbol VDD TA Supply voltage Operating temperature Parameter Min 2.4 -25 ETE - OBSOL - Typ Max 9.5 85 Units V C Conditions Enable/Disable Table (See Figure 4) RSW resistor VDD GND HV803 Enabled Disabled 15-2 HV803 Block Diagram Lx VDD Cs RSW-osc Switch Osc Q GND Disable VA + C _ Q Vref Output Osc Q VB REL-osc Q ETE - OBSOL - Figure 1: Test Circuit, VIN = 3.0V ON = VDD OFF = 0V (Low input current with moderate output brightness). 2M 1 750K 560H1 VIN = 3.0V 1N4148 0.1F2 0.1F 100V Note: 1. Murata part # LQH4N561K04 (DC resistance < 14.5) 2. Larger values may be required depending upon supply impedance. VDD RSW-osc Cs Lx REL-osc VA VB GND 8 2.0K 2 3 4 7 10nF 15 6 5 Equivalent to 3 square inch lamp. HV803 For additional information, see application note AN-H33. 15-3 HV803 Typical Performance Curves for Figure 1 using 3in2 EL Lamp. VCS vs. VIN IIN vs. VIN 100 90 80 70 60 50 40 1 2 3 VIN (V) 4 5 50 45 40 35 30 25 20 IIN (mA) VCS (V) 1 2 3 VIN (V) 4 5 Brightness vs. VIN IIN vs. VCS (V) 12 10 8 6 4 2 0 1 2 3 VIN (V) 50 45 40 35 30 25 20 50 60 70 VCS (V) Brightness (ft-Im) IIN (mA) 4 5 80 90 ETE - OBSOL - IIN, VCS, Brightness vs. Inductor Value 90 80 70 60 IIN (mA), VCS (V) VCS (V) 9.0 8.0 7.0 6.0 5.0 Brightness (ft-Im) Brightness (ft-Im) 50 40 30 IIN (mA) 4.0 3.0 2.0 1.0 0 20 10 0 100 250 400 550 Inductor Value (H) 700 850 1000 15-4 HV803 Figure 2: Typical 5.0V Application* ON = VDD OFF = 0V 2M 1 750K 560H1 VIN = 5.0V 1N4148 0.1F2 0.1F 100V VDD RSW-osc Cs Lx 1nF REL-osc VA VB GND 8 2.0K 2 3 4 7 6 5 6 in2 lamp HV803 Note: 1. Murata part # LQH4N561K04 (DC resistance < 14.5) 2. Larger values may be required depending upon supply impedance. For additional information, see application note AN-H33. Typical Performance Curves for Figure 2 VCS vs. VIN 90 85 80 75 70 65 ETE - OBSOL - 40 38 36 34 32 30 4 5 IIN (mA) IIN vs. VIN VCS (V) 4 5 6 VIN (V) 7 8 6 VIN (V) 7 8 15 Brightness vs. VIN 8 7.5 7 6.5 6 5.5 IIN vs. VCS (V) 4 5 6 VIN (V) 7 8 40 38 36 34 32 30 70 Brightness (ft-Im) IIN (mA) 75 80 VCS (V) 85 90 15-5 HV803 Figure 3: Typical 9.0V Application* 2M 1 330K 560H1 VIN = 9.0V 1N4148 0.1F2 0.1F 100V Note: 1. Murata part # LQH4N561K04 (DC resistance < 14.5) 2. Larger values may be required depending upon supply impedance. VDD RSW-osc Cs Lx REL-osc VA VB GND 8 5.1K 2 3 4 7 6 5 10 in2 lamp 1nF HV803 Typical Performance Curves for Figure 3 VCS vs. VIN 100 90 80 70 60 5.5 ETE - OBSOL - 40 38 36 34 32 30 5.5 IIN (mA) For additional information, see application note AN-H33. IIN vs. VIN VCS (V) 6.5 7.5 VIN (V) 8.5 9.5 6.5 7.5 VIN (V) 8.5 9.5 Brightness vs. VIN 6 5 4 3 2 1 5.5 IIN vs. VCS (V) 6.5 7.5 VIN (V) 8.5 9.5 40 38 36 34 32 30 65 Brightness (ft-Im) IIN (mA) 70 75 80 VCS (V) 85 90 95 15-6 HV803 External Component Description External Component Diode Cs Capacitor REL-osc Selection Guide Line Fast reverse recovery diode, 1N4148 or equivalent. 0.01F to 0.1F, 100V capacitor to GND is used to store the energy transferred from the inductor. 0.01F is recommended when driver has large EL lamps. The EL lamp frequency is controlled via an external REL resistor connected between REL-osc and VDD of the device. The lamp frequency increases as REL decreases. As the EL lamp frequency increases, the amount of current drawn from the battery will increase and the output voltage VCS will decrease. The color of the EL lamp is dependent upon its frequency. A 2M resistor would provide lamp frequency of 300 to 430Hz. Decreasing the REL-osc by a factor of 2, the lamp frequency will increase by factor of 2. RSW-osc The switching frequency of the converter is controlled via an external resistor, RSW between RSW-osc and VDD of the device. The switching frequency increases as RSW decreases. With a given inductor, as the switching frequency increases, the amount of current drawn from the battery will decrease and the output voltage, VCS, will also decrease. A 1nF capacitor is required on RSW-osc pin to GND when the input voltage is equal to or greater than 5V. As the input voltage of the device increases, a faster switching converter frequency is required to avoid saturating the inductor. With the higher switching frequency, more noise will be introduced. This capacitor is used to shunt any switching noise that may couple into the RSW-osc pin. The inductor Lx is used to boost the low input voltage by inductive flyback. When the internal switch is on, the inductor is being charged. When the internal switch is off, the charge stored in the inductor will be transferred to the high voltage capacitor CS. The energy stored in the capacitor is then available to the internal H-bridge and therefore to the EL 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) should be increased to avoid saturation. 560H Murata inductors with 14.5 series DC resistance is typically recommended. For inductors with the same inductance value but with lower series DC resistance, lower RSW value is needed to prevent high current draw and inductor saturation. Lamp As the EL lamp size increases, more current will be drawn from the battery to maintain high voltage across the EL lamp. The input power, (VIN x IIN), will also increase. If the input power is greater than the power dissipation of the package (350mW), an external resistor in series with one side of the lamp is recommended to help reduce the package power dissipation. CSW Capacitor Lx Inductor Enable/Disable Configuration The HV803 can be easily enabled and disabled via a logic control signal on the RSW and REL resistors as shown in Figure 4 below. The control signal can be from a microprocessor. RSW and REL are typically very high values. Therefore, only 10's of microam- LETE - OBSO - REL peres will be drawn from the logic signal when it is at a logic high (enable) state. When the microprocessor signal is high the device is enabled and when the signal is low, it is disabled. Figure 4: Enable/Disable Configuration ON =VDD OFF = 0V 15 Enable 1 RSW Lx + VDD 0.1F CS 100V VDD RSW-osc Cs Lx REL-osc VA VB GND 8 5.1K 2 3 1N4148 7 EL Lamp 6 5 4 HV803LG 1nF 15-7 HV803 Split Supply Configuration Using a Single Cell (1.5V) Battery The HV803 can also be used for handheld devices operating from a single cell 1.5V battery where a regulated voltage is available. This is shown in Figure 5. The regulated voltage can be used to run the internal logic of the HV803. The amount of current necessary to run the internal logic is typically 30 to 60A. Therefore, the regulated voltage could easily provide the current without being loaded down. The HV803 used in this configuration can also be enabled/disabled via logic control signal on the RSW and REL resistors as shown in Figure 4. Split Supply Configuration for Battery Voltages of Higher than 9.5V Figure 5 can also be used with high battery voltages such as 12V as long as the input voltage, VDD, to the HV803 device is within its specifications of 2.4V to 9.5V. Figure 5: Split Supply Configuration ON OFF Regulated Voltage RSW Lx + Battery Voltage LETE - - OBSO REL VDD GND Enable 1 2 3 0.1F* CS 100V 1N4148 VDD RSW-osc Cs Lx REL-osc VA VB GND 8 7 EL Lamp 6 5 4 HV803LG *Larger values may be required depending upon supply impedance. For additional information, see application note AN-H33. 15-8 |
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