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4 HV852 Load R EL V DD I DD V A-VB f EL 3.3nF+1KΩ 1.5MΩ 2.4V 17.56mA 77V 245Hz 3.0V 17.53mA 79V 3.6V 17.44mA 79V 4.2V 17.65mA 79V 5.0V 18.35mA 79V Typical Performance (The following was the observed performance when driving a 1.0in2 green lamp) Pin Description Name Description V DD Input supply voltage pin. R EL An external resistor to V DD will set the EL lamp frequency. The EL frequency is inversely proportional to the R EL resistor value. A 1.5MΩ resistor would provide a nominal lamp frequency of 250Hz. When using an external clock to set the EL lamp frequency, the R EL pin should be connected to ground. EN Enable input pin. Logic high will turn the device on. An external R-C circuit can be added for a delayed turn off. CLK IN 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. CLK EN Logic input pin. Logic high will cause the EL lamp frequency to be set by the CLK IN input. Logic low will cause the EL lamp frequency to be set by the external R EL resistor. Gnd IC ground pin. V B EL lamp driver output pin. The EL lamp is connected across V A and VB terminals. V A EL lamp driver output pin. The EL lamp is connected across V A and VB terminals. Functional Block Diagram Feedback EL Oscillator VDD MOSFET Full Bridge REL VDD VA VB EN GND CLKIN CLKEN VDD Capacitor Charge Pump Circuit VSENSE High Voltage Level Trans- lators |
