HV831 HV831MG-G MSOP-10 IN9141 LQH32CN561K21 HV831MG MO-187 DSPD-10MSOPMG

High Voltage Dual EL Lamp Driver Features General Description The Supertex HV831 is a high voltage driver designed for driving

HV831 HV831 High Voltage Dual EL Lamp Driver Features General Description The Supertex HV831 HV831 is a 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 2.0 to 5.0V. The device is designed to reduce the amount of audible noise emitted by the lamp. This device uses a single inductor and minimum number of passive components to drive two EL lamps. The nominal regulated output voltage of ±80V 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. Independent input control for lamp selection Split supply capability Patented output timing One miniature inductor to power both lamps Low shutdown current Wide input voltage range 2.0V to 5.0V Output voltage regulation No SCR output Available in 10-Lead MSOP package Applications Mobile cellular phones, dual display Keypad and LCD backlighting Portable instrumentation Dual segment lamps Hand held wireless communication devices The HV831 HV831 has an internal oscillator, a switching MOSFET, and two high voltage EL lamp drivers. An external resistor connected between the RSW-OSC 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 128. 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 two EL lamps are connected between EL1 to Com and EL2 to Com. 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 80V, the switching MOSFET is turned off to conserve power. The outputs EL1 to Com and EL2 to Com are configured as H bridges and switch in opposite states to achieve 160V across the EL lamp. Typical Application Circuit VDD = ON 0 = OFF + VDD VDD = ON 0 = OFF EL Lamp 11 1 C1 RSW-Osc CDD + 2 VDD EL2 9 3 RSW-Osc COM 8 4 C2 LX 6 HV831 HV831 CIN EL Lamp 21 CS 7 5 GND - VIN EL1 10 D ~ LX 1. The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 terminals (pins 10 and 9 respectively) CS HV831 HV831 Ordering Information Pin Configuration Package Option C1 1 10 EL1 VDD 2 9 EL2 RSW-Osc 3 8 COM C2 4 7 CS GND 5 6 LX 10-Lead MSOP Device 3.00x3.00mm body 1.10mm height (max) 0.50mm pitch HV831 HV831 HV831MG-G HV831MG-G -G indicates package is RoHS compliant (`Green') 10-Lead MSOP (MG) (top view) Product Marking Top Marking H831 LLLL Absolute Maximum Ratings Parameter Value Supply voltage, VDD Bottom Marking -0.5 to +7.5V Supply voltage, VCS -0.5 to +120V Operating ambient temperature range YYWW -40°C to +85°C Storage temperature range L = Lot Number YY = Year Sealed WW = Week Sealed = "Green" Packaging -65° to +150°C Power dissipation 10-Lead MSOP Function Table 250mW C1 Com IC 0 Hi Z Hi Z Hi Z OFF 1 Hi Z ON ON ON 1 0 ON Hi Z ON ON 1 ON ON ON ON ja MSOP-10 MSOP-10 EL2 1 Package EL1 0 Thermal Resistance C2 0 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, GND 400 oC/W (Mounted on FR4 board, 25mm x 25mm x 1.57mm) Recommended Operating Conditions Sym VDD TA Parameter Min Typ Max Units Supply voltage 2.0 - 5.0 V - Operating temperature -40 - +85 C - 2 o Conditions HV831 HV831 Electrical Characteristics DC Characteristics (Over operating conditions unless otherwise specified, T = 25°C) A Sym RDS(ON) Parameter On-resistance of switching transistor Min Typ Max Units Conditions - - 6.0 I = 100mA VDD Input voltage range 2.0 - 5.0 V - VCS Output regulation voltage 72 80 88 V VDD = 2.0V to 5.0V VDIFF Differential output peak to peak voltage (EL1 to COM, EL2 to COM) 144 160 176 V VDD = 2.0V to 5.0V IDDQ Quiescent VDD supply current - - 150 nA C1 = C2 = 0V IDD Input current into the VDD pin - - 150 µA VDD = 2.0V to 5.0V - - 45 IIN Input current including inductor current when driving both lamps mA - 26.5 35 VIN = 3.0V. See Figure 1. TA= -40 to +85°C VIN = 3.0V. See Figure 1. TA= 25°C VCS Output voltage on VCS when driving both lamps - 67.8 - V VIN = 3.0V. See Figure 1. VDIFF Differential output peak to peak voltage across each lamp. (EL1 to Com, EL2 to Com) - 135.6 - V VIN = 3.0V. See Figure 1. fEL VDIFF output drive frequency 214 244 274 Hz VIN = 3.0V. See Figure 1. fSW Switching transistor frequency 27.4 31.2 35 kHz VIN = 3.0V. See Figure 1. D Switching transistor duty cycle 85 - 89 % - IIL Input logic low current going into the control pin - - -0.6 µA VDD = 2.0V to 5.8V IIH Input logic low current going into the control pin - - 0.6 µA VDD = 2.0V to 5.8V VEN-L Logic input low voltage 0 - 0.2VDD V - VEN-H Logic input high voltage 0.8VDD - VDD V - 3 HV831 HV831 Functional Block Diagram LX VDD CS C1 Control Logic & Switch-Osc C2 RSW-Osc EL1 VSENSE + - Disable GND Vcs Output Drivers VREF EL2 Vcs Logic Control & Divide by 128 COM Figure 1: Test Circuit VDD = ON VDD = ON 0 = OFF 0 = OFF VDD - VIN + 2 VDD EL2 9 RSW-Osc COM 8 C2 CS 7 GND LX EL Lamp 1 (1.3in2)3 10 3 470 k EL1 4 0.1µF C1 5 + 1 6 HV831 HV831 EL Lamp 2 (0.93in2)3 IN9141 IN9141 560µH2 4.7µF ~ 3.3 nF, 200V 1. or any (equivalent or better) > 90V, fast recovery diode. 2. Murata LQH32CN561K21 LQH32CN561K21. 3. The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 terminals (pins 10 and 9 respectively). Device HV831MG HV831MG Lamp EL1 Both EL1 and EL2 ON VDD IDD 17.3mA 4 74.8V 26.5mA 3.0V VCS 67.8V fEL 244Hz Brightness 5.9ft-lm 5.5ft-lm HV831 HV831 Split Supply Configuration the internal logic is less than 150µA. Therefore, the regulated voltage could easily provide the current without being loaded down. The HV831 HV831 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 HV831 HV831. The amount of current used to drive Figure 2: Split Supply Configuration VDD = ON VDD = ON 0 = OFF 0 = OFF EL Lamp 11 1 10 2 VDD EL2 9 RSW-Osc COM 8 4 C2 CS 7 5 RSW-Osc EL1 3 Regulated Voltage = VDD C1 GND LX 6 Battery Voltage = VIN EL Lamp 21 D ~ HV831 HV831 CS LX 1. The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 terminals (pins 10 and 9 respectively) Audible Noise Reduction This section describes a method (patented) developed at Supertex to reduce the audible noise emitted by the EL lamps used in application sensitive to audible noise. The waveform takes the shape of approximately 2RC time constants for rising and 2RC time constants for falling, where C is the capacitance of the EL lamp, and R is the external resistor, RSER connected in series with the EL lamp. Figure 3 shows a general circuit schematic that uses the series resistors, RSER1 and RSER2, for each of the EL lamps. RSER1 and RSER2 are connected in series with the EL lamp. The audible noise can be set a desirable level by selecting the resistances for RSER1 and RSER2. It is important to note Figure 3: Typical Application Circuit For Audible Noise Reduction ON = VDD OFF = 0 ON = VDD OFF = 0 Enable 1 RSER1 Enable 2 VIN - + - CDD CIN RSW-Osc EL1 2 VDD EL2 9 3 RSW-Osc COM 8 C2 CS 7 GND LX EL Lamp 11 10 5 + C1 4 VDD 1 6 HV831 HV831 RSER2 D ~L X 1. The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 terminals (pins 10 and 9 respectively) 5 EL Lamp 21 CS HV831 HV831 Typical HV831 HV831 Performance Curves VCS vs VIN 80 75 70 65 60 55 50 IIN vs VIN 30 28 IIN (mA) 26 24 22 2.0 2.5 3.0 3.5 4.0 4.5 2.0 2.5 3.0 4.0 4.5 VIN (V) Brightness vs Vin 8 7 6 5 4 3 2 IIN vs VCS 30 IIN (mA) 28 26 24 22 2.0 2.5 3.0 3.5 4.0 50 4.5 55 60 IIN, VCS, Brightness vs Inductor Value 90 7.5 7.0 70 60 6.5 Brightness (measured on EL1 lamp) 50 6.0 40 5.5 lIN 30 5.0 20 4.5 100 70 8.0 VCS 80 10 65 VCS (V) VIN (V) lIN (mA), VCS (V) Brightness (ft-lm) VIN (V) 3.5 200 300 400 Inductor Value (mH) 6 500 600 4.0 Brightness (ft-lm) VCS (V) (When driving both EL Lamps, EL1 Lamp = 1.3in2, EL2 Lamp = 0.93in2, VDD = 3.0V) 75 80 HV831 HV831 Pin Configuration and Description Pin # Name 1 C1 2 VDD Function 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 supply voltage pin. External resistor connection to set both the switching MOSFET frequency and EL Lamp frequency. The external resistor should be connected between this pin and the VDD pin. The EL lamp frequency is switching frequency divided by 128. 3 RSW-Osc 4 C2 5 GND 6 LX The switching frequency increases as the value of RSW-OSC decreases. A 470k resistor will provide a switching frequency of 31.2 kHz, and an EL lamp frequency of 244 Hz. To change the frequency to fSW1, the value of the resistor RSW-OSC1 can be determined as RSW-OSC1 = (470 x 244) / fEL1M. 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. IC Ground Pin. External inductor connection to boost the low input voltage using inductive flyback. Connect an inductor between VIN and this pin. Also connect a high voltage fast recovery diode between this pin and the CS pin. The anode of the diode needs to be connected to the LX pin and the cathode to the CS pin. In general, small valued inductors, which can handle more current, are more suitable for driving large sized lamps. As the inductor value decreases, the switching frequency should be increased to avoid saturation. 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. 7 CS 8 COM Common connection for both EL lamps. Connect one end of both the lamps to this pin. 9 EL2 EL lamp 2 connection. For optimum performance, the smaller of the two lamps should be connected to this pin. 10 EL1 EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected to this pin. 7 HV831 HV831 10-Lead MSOP Package Outline (MG) 3.00x3.00mm body, 1.10mm height (max), 0.50mm pitch D 10 1 (x4) E E1 Note 1 (Index Area D/2 x E1/2) L L1 1 Top View A2 Seating Plane View B A A Gauge Plane L2 View B Seating Plane b e A1 A Side View View A-A Note: 1. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier; an embedded metal marker; or a printed indicator. Symbol Dimension (mm) A A1 A2 b D E E1 MIN 0.75* 0.00 0.75 0.17 2.80* 4.65* 2.80* NOM - - 0.85 - 3.00 4.90 3.00 MAX 1.10 0.15 0.95 0.33 3.20* 5.15* 3.20* e 0.50 BSC L 0.40 0.60 0.80 L1 0.95 REF L2 0.25 BSC 1 0 5O O - - 8 15O O JEDEC Registration MO-187 MO-187, Variation BA, Issue E, Dec. 2004. * This dimension is not specified in the original JEDEC drawing. The value listed is for reference only. Drawings are not to scale. Supertex Doc. #: DSPD-10MSOPMG DSPD-10MSOPMG, Version E101008 E101008 Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate "product liability indemnification insurance agreement." Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. website: http//www.supertex.com. ©2008 Doc.# DSFP-HV831 DSFP-HV831 C101708 C101708 All rights reserved. Unauthorized use or reproduction is prohibited. 8 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com