HV845K7-G

HV845 SUTEX | Alldatasheet

Document overview

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Technical content

Features

Independent input control for lamp selection 180V PP 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 12-Lead QFN/MLP package

Applications

Dual display cellular phones Keypad and LCD backlighting Portable instrumentation Dual segment lamps Hand held wireless communication devices General Description The Supertex HV845 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 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, C 1 and C 2. The device is disabled when both C 1 and C2 (pins 12 and 3) are at logic low. The HV845 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, which signifi cantly minimizes the DC offset seen by the EL lamp. An external resistor connected between the R SW-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 L X and the VDD pins. Depending on the EL lamp size, a 1.0 to 10.0nF, 100V capacitor is connected between C S and Ground. The switching MOSFET charges the external inductor and discharges it into the capacitor at C S. The voltage at C S increases. Once the voltage at C S reaches a nominal value of 90V, the switching MOSFET is turned OFF to conserve power. Typical Application Circuit HV845K7-G VDD RSW-OSC COM2 EL2 LX CS GNDC2 EL1 COM1 D 1.0µF 1.5V 1.5V VDD VIN CIN 4.7µF CDD 0.1µF 845kΩ 3.3MΩ 3.3MΩ EL Lamp 1 EL Lamp 2 1.0µF 330µH CS 3.3nF, 100V LX

Ordering Information

-G indicates package is RoHS compliant (‘Green’) Absolute Maximum Ratings Symbol Parameter Min Typ Max Units Conditions

Electrical Characteristics

(Over recommended operating conditions unless otherwise specifi ed - VIN = VDD = 3.3V, 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. Parameter Value Supply Voltage, VDD -0.5V to 7.5V Output Voltage, VCS -0.5V to 120V Operating Temperature Range -40°C to 85°C Storage temperature -65°C to 150°C Symbol Parameter Min Typ Max Units Conditions Recommended Operating Conditions VDD Supply voltage 2.0 - 5.8 V --- TA Operating temperature -40 - +85 oC --- Pin Confi guration Thermal Resistance Package θja QFN/MLP - 12 60 oC/W Note: Mounted on FR4 board, 25mm x 25mm x 1.57mm RDS(ON) On-resistance of switching transistor - - 10 Ω I = 100mA VDD Input voltage range 2.0 - 5.8 V --- VCS Output regulation voltage 80 90 100 V V DD = 2.0V to 5.8V VDIFF Differential output peak to peak voltage (EL 1 to COM1, EL2 to COM2) 160 180 200 V V DD = 2.0V to 5.8V IDDQ Quiescent VDD supply current -- 1 5 0 n A C 1 = C2 = 0.1V - - 250 nA C 1 = C2 = 0.3V IDD Input current into the VDD pin - - 250 μA V DD = 5.8V IIN Average input current including inductor current when driving both lamps -2 0 3 0 m A V IN = 5.5V (See Figure 1) VCS Output voltage on VCS when driving both lamps -8 7- V V IN = 5.5V (See Figure 1) Note: Pads are on the bottom of the package. Back-side heat slug is at ground potential. HV845K7-G Top View VDD RSW-OSC GND EL2 EL1 COM2 CSLX COM1 NC 12 11 10 654

Differential output peak to peak volt- age across each lamp (EL 1 to COM1, EL2 to COM2) 160 180 200 V V IN = 5.5V (See Figure 1) fEL VDIFF output drive frequency 170 200 230 Hz R SW = 845kΩ fSW Switching transistor frequency 87 102 118 kHz R SW = 845kΩ fSW temp Switching transistor frequency tempco -1 5- % T A = -40°C to +85°C D Switching transistor duty cycle - 85 - % T A = -40°C to +85°C IIL Input logic low current - - 1.0 μA V DD = 2.0V to 5.8V IIH Input logic low current - - 1.0 μA V DD = 2.0V to 5.8V VIL Logic input low voltage 0 - 0.3 V --- VIH Logic input high voltage 1.5 - V DD V --- Symbol Parameter Min Typ Max Units Conditions Electrical Characteristics (cont.) VCS Output Drivers VSENSE VREF Control logic and switch oscillator Disable Logic control and divide by 512 EL1 EL2 RSW-OSC CSLX VDD GND C COM1 VDD VCS VCS COM2 Function Table Logic Inputs Outputs Device C1 C2 EL1 EL2 COM1 COM2 0 0 Hi Z Hi Z Hi Z Hi Z OFF 0 1 H i ZO NH i ZO N O N 1 0 ON Hi Z ON Hi Z ON 1 1 ON ON ON ON ON

3.3nF, 100V HV845K7-G 1N4148* * or any (equivalent or better) > 90V, fast recovery diode Cooper LPO6610-334MLB * The bigger sized lamp should be tied to EL 1 and the smaller sized lamp to EL2 (pins 10 and 9 respectively) VDD RSW-OSC COM2 EL2 LX CS GNDC2 EL1 COM1 620Ω 620Ω 11nF 13nF 1.8in2 EL Lamp 2* 2.1in2 EL Lamp 1* 330µH** 845kΩCDD 0.1µF CIN 4.7µF VDD VIN LX VIH = ON 0 = OFF VIH = ON 0 = OFF Typical Performance Lamp V DD (V) V IN (V) I IN (mA) V CS (VPEAK)f EL (Hz) Lamp Brightness (cd/in2) EL1 EL2 EL1 ON 3.0V 5.2V 7.96 88 195 13.89 - EL2 ON 6.91 - 12.89 Both EL1 and EL2 ON 13.93 13.02 11.24 EL1 ON 5.5V 7.47 13.93 - EL2 ON 6.42 - 13.22 Both EL1 and EL2 ON 13.42 13.30 12.05 EL1 ON 5.8V 7.04 14.03 - EL2 ON 6.01 - 13.30 Both EL1 and EL2 ON 12.94 13.55 12.51

Pin Confi guration and Description Pin # Function Description 1V DD Input voltage supply pin. 2R SW-OSC External resistor connection to set both the switching MOSFET frequency and EL Lamp frequency. The external resistor should be connected between V DD and this pin. The EL lamp frequency is the switching frequency divided by 512. The switching frequency is inversely proportional to the resis- tor value. A 845kΩ resistor will provide a nominal switching frequency of 102kHz and an EL lamp frequency of 200Hz. To change the frequency to f EL1, the value of the resistor RSW-OSC1 can be deter- mined as RSW-OSC1 = (845 x 200) / fEL1 kΩ. 3C 2 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. 4 GND Device ground. 5L X 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 C S pin. 6C S Connect a 100V capacitor between this pin and GND. This capacitor stores the energy transferred from the inductor. 7 COM2 Common lamp connection for EL 2. 8 COM1 Common lamp connection for EL 1. 9E L 2 EL lamp 2 connection. For optimum performance, the smaller of the two lamps should be connected to this pin.

10 EL 1

EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected to this pin. 11 NC No connect.

12 C 1

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. Figure 2 - Split Supply Confi guration HV845K7-G VDD RSW-OSC COM2 EL2 LX CS GND EL1 COM1 D CS LXCIN CDD VIH = ON 0 = OFF VIH = ON 0 = OFF Regulated Voltage = VDD Battery Voltage = VIN RSW-OSC EL Lamp 1 EL Lamp 2 Split Supply Confi guration The HV845 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 HV845. The amount of current used to drive the internal logic is less than 200µA. Therefore, the regu- lated voltage could easily provide the current without being loaded down.

Doc.# DSFP - HV845 062306 HV845 Top View Side View 3.00 ± 0.15 0.40 ± 0.10 1.25 - 1.65

0.50 BSC

0.20 0.25 + 0.05 - 0.07 0 - 14O 1.25 - 1.65 Note: 1. All dimensions are in millimeters; all angles in degrees 2. Corner shape may differ from drawing 0.75 ± 0.05 0.0 - 0.05 Pin #1 Index 3.00 ± 0.15 Note 2 12-Lead QFN/MLP (3x3) Package (K7) (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.)