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| HV843 Initial Release Low Noise Dual EL Lamp Driver Features Low audible noise Independent input control for lamp selection 180Vpp output voltage Split supply capability Patented output timing One miniature inductor to power both lamps Low shutdown current Wide input voltage range 2.0V to 5.8V Output voltage regulation No SCR output Available in DFN/MLP - 10 package General Description The Supertex HV843 is a low noise, high voltage driver designed for driving two EL lamps with a combined area of 3.5 square inches. The input supply voltage range is from 2.0V to 5.8V. The device is designed to reduce the amount of audible noise emitted by the lamp. This device uses a single inductor and a minimum number of passive components to drive two EL lamps. The nominal regulated output voltage of 90V is applied to the EL lamps. The two EL lamps can be turned ON and OFF by the two logic input control pins, C1 and C2. The device is disabled when both C1 and C2 (pins 1 and 4) are at logic low. The HV843 has an internal oscillator, a switching MOSFET, and two high voltage EL lamp drivers. Each driver has its own half bridge common output (COM1 and COM2) connected to a single pin called COM which minimizes the DC offset seen by the EL lamp. An external resistor connected between the RSW-OSC pin and the voltage supply pin, VDD, sets the frequency for the switching MOSFET. The EL lamp driver frequency is set by dividing the MOSFET switching frequency by 512. An external inductor is connected between the LX and the VDD pins. Depending on the EL lamp size, a 1.0 to 10.0nF, 100V capacitor is connected between CS and Ground. The switching MOSFET charges the external inductor and discharges it into the capacitor at CS. The voltage at CS increases. Once the voltage at CS reaches a nominal value of 90V, the switching MOSFET is turned OFF to conserve power. Applications Dual display cellular phones Keypad and LCD backlighting Portable instrumentation Dual segment lamps Hand held wireless communication devices Typical Application Circuit 3.3M 1.0F EL Lamp 1 1 2 1.5V 1.5V 0 0 C1 VDD RSW-OSC EL1 10 EL2 Com CS LX 9 8 7 6 3.3M 1.0F EL Lamp 2 + VDD CDD 0.1F 845k 3 4C 2 5 CIN 4.7F D GND HV843K7-G + VIN LX 330H CS 3.3nF, 100V - 1 HV843 Ordering Information Device HV843 -G indicates package is RoHS compliant (`Green') Pin Configuration Package Options DFN/MLP - 10 HV843K7-G Pin 1 C1 VDD RSW-OSC C2 GND HV843K7-G EL1 EL2 COM CS LX Absolute Maximum Ratings Parameter Supply Voltage, VDD Output Voltage, VCS Operating Temperature Range Storage temperature Value -0.5V to 7.5V -0.5V to 120V -40C to 85C -65C to 150C Top View Note: Pads are on the bottom of the package. Back-side heat slug is at ground potential. Thermal Resistance Package DFN/MLP - 10 ja 60oC/W 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. Note: Mounted on FR4 board, 25mm x 25mm x 1.57mm Recommended Operating Conditions Symbol VDD TA Parameter Supply voltage Operating temperature Min 2.0 -40 Typ Max 5.8 +85 Units V o Conditions ----- C Electrical Characteristics (Over recommended operating conditions unless otherwise specified - VIN = VDD = 3.3V, TA=25C) Symbol RDS(ON) VDD VCS VDIFF Parameter On-resistance of switching transistor Input voltage range Output regulation voltage Differential output peak to peak voltage (EL1 to COM, EL2 to COM) Quiescent VDD supply current Input current into the VDD pin Average input current including inductor current when driving both lamps Output voltage on VCS when driving both lamps Min 2.0 80 160 - Typ 90 180 20 87 Max 10 5.8 100 200 150 250 250 30 - Units V V V nA nA A mA V Conditions I = 100mA --VDD = 2.0V to 5.8V VDD = 2.0V to 5.8V C1 = C2 = 0.1V C1 = C2 = 0.3V VDD = 5.8V VIN = 5.5V (See Figure 1) VIN = 5.5V (See Figure 1) IDDQ IDD IIN VCS 2 HV843 Electrical Characteristics (cont.) Symbol VDIF fEL fSW fSW temp D IIL IIH VIL VIH Parameter Differential output peak to peak voltage across each lamp (EL1 to COM1, EL2 to COM2) VDIFF output drive frequency Switching transistor frequency Switching transistor frequency tempco Switching transistor duty cycle Input logic low current Input logic low current Logic input low voltage Logic input high voltage Min 160 170 87 0 1.5 Typ 180 200 102 15 85 Max 200 230 118 1.0 1.0 0.3 VDD Units V Hz kHz % % A A V V Conditions VIN = 5.5V (See Figure 1) RSW = 845k RSW = 845k TA = -40C to +85C TA = -40C to +85C VDD = 2.0V to 5.8V VDD = 2.0V to 5.8V ----- Functional Block Diagram LX CS VDD RSW-OSC C1 C2 Control logic and switch oscillator VCS EL1 Disable VDD Logic control and divide by 512 GND Function Table Logic Inputs C1 0 0 1 1 C2 0 1 0 1 EL1 Hi Z Hi Z ON ON Outputs EL2 Hi Z ON Hi Z ON COM Hi Z ON ON ON Device OFF ON ON ON VREF 3 C VSENSE Output Drivers VCS COM1 EL2 + COM VCS COM2 HV843 Figure 1 - Test Circuit VIH = ON 0 = OFF VIH = ON 0 = OFF 1 2 2.1in2 EL Lamp 1*** 1.8in2 EL Lamp 2*** C1 VDD RSW-OSC C2 GND EL1 EL2 Com CS LX 10 9 8 7 6 620 13nF 620 11nF + VDD CDD 0.1F 845k 3 4 + VIN 5 1N4148* HV843K7-G CIN 4.7F LX 330H** CS 3.3nF, 100V * or any (equivalent or better) > 90V, fast recovery diode ** Cooper LPO6610-334MLB *** The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 (pins 10 and 9 respectively) Typical Performance Lamp EL1 ON EL2 ON Both EL1 and EL2 ON EL1 ON EL2 ON Both EL1 and EL2 ON EL1 ON EL2 ON Both EL1 and EL2 ON 5.8V 3.0V 5.5V 5.2V VDD (V) VIN (V) IIN (mA) 7.96 6.91 13.93 7.47 6.42 13.42 7.04 6.01 12.94 88 195 VCS (VPEAK) fEL (Hz) Lamp Brightness (cd/m2) EL1 13.89 13.02 13.93 13.30 14.03 13.55 EL2 12.89 11.24 13.22 12.05 13.30 12.51 4 HV843 Split Supply Configuration The HV843 can be used in applications operating from a battery where a regulated voltage is available. This is shown in Figure 2. The regulated voltage can be used to drive the internal logic of HV843. The amount of current used to drive the internal logic is less than 200A. Therefore, the regulated voltage could easily provide the current without being loaded down. Figure 2 - Split Supply Configuration VIH = ON 0 = OFF VIH = ON 0 = OFF 1 2 EL Lamp 1 C1 VDD RSW-OSC EL1 EL2 Com CS LX 10 9 8 7 6 EL Lamp 2 Regulated Voltage = VDD CDD RSW-OSC 3 4C 2 5 GND D HV843K7-G Battery Voltage = VIN CIN LX CS Pin Configuration and Description Pin # 1 2 Function C1 VDD Description Enable input signal for EL Lamp 1. Logic high will turn ON the EL lamp 1 and logic low will turn it OFF. Refer to the function table. Input voltage supply pin. External resistor connection to set both the switching MOSFET frequency and EL Lamp frequency. The external resistor should be connected between VDD and this pin. The EL lamp frequency is the switching frequency divided by 512. The switching frequency is inversely proportional to the resistor value. A 845k resistor will provide a nominal switching frequency of 102kHz and an EL lamp frequency of 200Hz. To change the frequency to fEL1, the value of the resistor RSW-OSC1 can be determined as RSW-OSC1 = (845 x 200) / fEL1 k. Enable input signal for EL Lamp 2. Logic high will turn ON the EL lamp 2 and logic low will turn it OFF. Refer to the function table. Device ground. Drain of internal switching MOSFET. Connection for an external inductor. When the switching MOSFET is turned ON, the inductor is being charged. When the MOSFET is turned OFF, the energy stored in the inductor is transferred to the high voltage capacitor connected at the CS pin. Connect a 100V capacitor between this pin and GND. This capacitor stores the energy transferred from the inductor. Common lamp connection for both EL1 and EL2. Connect one end of both the lamps to this pin. EL lamp 2 connection. For optimum performance, the smaller of the two lamps should be connected to this pin. EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected to this pin. 3 RSW-OSC 4 5 6 7 8 9 10 C2 GND LX CS COM EL2 EL1 5 HV843 10-Lead DFN/MLP Package Outline (K7) 3.00 2.20 3.00 Note 2 1.60 0.30 +0.15 -0.10 Pin #1 Index 0.50 BSC 0.25 +0.05 -0.07 Top View 0O - 14O 0.20 0.75 - 0.80 0.0 - 0.05 Side View Note: 1. All dimensions are in millimeters; angles in degrees 2. Corner shape may differ from drawing Doc.# DSFP - HV843 062606 6 |
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