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| HV852 Initial Release High Voltage, Low Noise, Inductorless EL Lamp Driver Features No external components required when using an external EL clock frequency EL frequency can be set by an external resistor Low Noise DC to AC converter Drives up to 5.3nF (approx. 1.5in2 lamp) load Output voltage regulation Enable function General Description The Supertex HV852 is a high voltage, low noise, inductorless EL (electroluminescent) lamp driver. It is designed to drive EL lamps of up to 1.5in2, with capacitive values up to 5.3nF over an input voltage range of 2.4V to 5.0V. The HV852 converts a low voltage DC input to a high voltage AC output across an EL lamp. It uses a charge pump scheme to boost the input voltage eliminating the need for an external inductor, diode, and high voltage capacitor commonly found in conventional topologies. The charge pump circuit discharges its energy into an EL lamp through a high voltage H-bridge. Once the voltage reaches its regulated limit, it is turned off to conserve power. The EL lamp is then discharged to ground and the H-bridge changes state to allow the charge pump to charge the EL lamp in the opposite direction. Applications Cellular phone keypad Watches Small handheld wireless devices MP3 Players Typical Application Circuit HV852 + VDD CDD REL VDD REL EN CLKIN VA VB GND CLKEN EL LAMP VDD = ON GND = OFF EL Lamp frequency set by REL 1 HV852 Ordering Information Package Options DEVICE MSOP-8 HV852 HV852MG-G DFN-10 HV852K7-G -G indicates package is RoHS compliant (`Green') Absolute Maximum Ratings Parameter VDD, Supply Voltage Operating Temperature Storage Temperature Power Dissipation MSOP-8 Power Dissipation DFN-10 Value -0.5V to 6.5V -25C to +85C -65C to +150C 300mW 1.6W Pin Configuration VDD 1 2 3 4 8 7 6 5 VA VB VDD 1 2 3 4 5 10 9 8 7 6 VA VB GND GND CLKEN REL EN CLKIN GND CLKEN REL EN CLKIN VDD 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. 8-Lead MSOP (MG) (top view) 10-Lead DFN (K7) (top view) Note: Pads are at the bottom of the package. Center heat slug is at ground potential. Electrical Characteristics (Over recommended operating conditions unless otherwise specified: TA = 25C, VDD = 3.5V) Symbol IDDQ VA or VB VA-VB IDD VA or VB VA-VB fEL trout Parameter Quiescent current Peak output voltage Peak to Peak output voltage Operating current Peak output voltage Peak to Peak output voltage EL lamp frequency Output voltage rise time Min 72 144 72 144 210 - Typ 80 160 15.2 80 160 250 640 Max 200 88 176 30 88 176 300 - Units nA V Conditions EN = 0V No load V mA V V Hz s 1.0in2 lamp, 0V to 90% of final value See Figure 1, VDD = 3.5V, REL = 1.5M, Load = 3.3nF+1K Logic Inputs VIL VIH IIL IIH ENrise ENfall Cin Input logic low voltage Input logic high voltage Input logic low current Input logic high current Enable input rise time (for delay turn off) Enable input fall time (for delay turn off) Logic input capacitance 0 2.0 0.01 10 0.5 VDD 1.0 1.0 10 5 10 V V A A ms Using external R-C circuit, see Figure 2 s pF ----------- Recommended Operating Conditions VDD fEL Cload TA Input voltage EL lamp frequency EL lamp capacitance Operating Temperature 2.4 50 0 -25 5.0 500 5.3 +85 V Hz nF C --------- 2 HV852 Typical Output Waveform Test Conditions: HV852 driving a 1.0in2 EL lamp VDD= 3.6V and REL= 1.5M, VA-VB waveform Functional Block Diagram VDD VDD EN Capacitor Charge Pump Circuit VA VSENSE Feedback CLKIN CLKEN REL VDD EL Oscillator High Voltage Level Translators VB MOSFET Full Bridge GND Pin Description Name VDD REL EN CLKIN Description Input supply voltage pin. An external resistor to VDD will set the EL lamp frequency. When using an external clock to set the EL lamp frequency, the REL pin should be connected to ground. Enable input pin. Logic high will turn the device on. An external R-C circuit can be added for a delayed turn off. Logic input pin. An external logic clock applied to this pad can be used to set the EL lamp frequency (see Figure 3). The EL lamp frequency is the external clock frequency divided by 128. This is useful for applications requiring the EL lamp to be synchronized to a system clock. Connect to ground when not in use. Logic input pin. Logic high will cause the EL lamp frequency to be set by the CLKIN input. Logic low will cause the EL lamp frequency to be set by the external REL resistor. IC ground pin. EL lamp driver output pin. The EL lamp is connected across VA and VB terminals. EL lamp driver output pin. The EL lamp is connected across VA and VB terminals. CLKEN Gnd VB VA 3 HV852 Typical Performance (The following was the observed performance when driving a 1.0in2 green lamp) Load REL VDD 2.4V 3.0V IDD 17.56mA 17.53mA 17.44mA 17.65mA 18.35mA VA-VB 77V 79V 79V 79V 79V fEL 3.3nF+1K 1.5M 3.6V 4.2V 5.0V 245Hz Figure 1: Typical Application HV852 + VDD - CDD REL VDD REL EN CLKIN VA VB GND CLKEN EL Lamp VDD = ON GND = OFF Note: CDD = 2.2F, 6.3V ceramic capacitor Figure 2: Push Button Turn on with Delay Turn off HV852 + VDD Push Button Turn On CDD C REL VDD REL EN VA VB GND CLKEN EL Lamp - R CLKIN RC time constant will set Turn OFF Delay time Figure 3: Independent Programmable Output Frequency (fEL) + VDD VDD = ON GND = OFF VDD GND fCLK Note: fEL = fCLK/128 CDD HV852 VDD REL EN CLKIN VA VB GND CLKEN VDD EL Lamp EL Lamp frequency set exrernal clock 4 HV852 8-Lead SOIC Package (MG) 3.00 0.20 4.90 0.25 Note 2 3.00 0.20 Top View 0.08 - 0.23 1.10 MAX 0.75 - 0.95 5 - 15 (4 PLCS) 0 - 8 0.15 MAX 0.65BSC 0.40 - 0.80 0.22 - 0.38 Side View Notes: 1. All dimensions in millimeters; angles in degrees 2. Pin 1 identifier must be located within the indicated area End View 5 HV852 10-Lead DFN Package (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 Notes: 1. All dimensions are in millimeters; angles in degrees 2. Corner shape may differ from drawing Doc.# DSFP - HV852 NR071006 6 |
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