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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HV861 bảng dữ liệu(PDF) 1 Page - Microchip Technology |
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HV861 bảng dữ liệu(HTML) 1 Page - Microchip Technology |
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1 / 17 page  2023-2026 Microchip Technology Inc. and its subsidiaries DS20005911B-page 1 HV861 Features • Adjustable Output Regulation for Dimming • Lamp Fade-in/Fade-out Capability • Low Audible Noise • 180 VPP Output Voltage for Higher Brightness • 1.5V Enable Input Logic High • Single-cell Lithium Ion-compatible • One Miniature Inductor to Power both Lamps • Separately Adjustable Lamp and Converter Frequencies • Split Supply Capability Applications • Dual Display Cellular Phones • Keypad and LCD Backlighting • Personal Digital Assistant (PDA) • Handheld Wireless Communication Products • Global Positioning Systems (GPS) General Description The HV861 is a low-noise dimmable high-voltage dual EL lamp driver designed for driving two electroluminescent (EL) lamps with a combined area of 5 in2. The input supply voltage range is from 2.5V to 4.5V. Enable input logic high can go as low as 1.5V, which allows logic interface operating from typical 1.8V supplies. The device is designed to minimize audible noise emitted by the EL lamps. The device uses a single inductor and a minimum number of passive components. With the internal reference voltage, the regulated output voltage is at a nominal value of 90V. The EL lamps therefore see ±90V. The two EL lamps can be turned on and turned off using two CMOS logic inputs, EN1 and EN2. The driver is disabled when both EN1 and EN2 are at logic low. The HV861 has two internal oscillators, a switching MOSFET, and two high-voltage EL lamp driver H-bridges. Each driver has its own half-bridge common output, COM1 and COM2, which significantly minimizes the DC offset seen by the EL lamp. The frequency for the switching MOSFET is set by an external resistor connected between the RSW-Osc pin and the supply pin, VDD. The EL lamp driver frequency is set by an external resistor connected between the REL-Osc pin and the VDD pin. An external inductor is connected between the LX and VDD pins or VIN for split supply applications. Depending upon the EL lamp sizes, a 1 nF to 10 nF capacitor is connected between the CS and ground. As the switching MOSFET charges the external inductor and discharges it into the capacitor at CS, the voltage at CS starts to increase. Once the voltage at CS reaches a nominal value of 90V, the switching MOSFET is turned off to conserve power. EL lamp dimming can be accomplished by applying a PWM logic signal to the PWM pin. The EL lamp brightness will be inversely proportional to the PWM duty cycle. The HV861 can also slowly turn on or turn off the EL lamp, giving a fade on/off appearance. Package Type See Table 2-1 for pin information. 16-lead WQFN (Top view) 1 12 2 3 4 5 6 7 8 9 10 11 13 14 15 16 VREF VREG VOUT PWM EL1 COM1 COM2 EL2 REL-Osc RSW-Osc VDD EN1 EN2 GND LX CS Low-Noise Dimmable Dual EL Lamp Driver Obsolete Device |
Số phần tương tự - HV861 |
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Mô tả tương tự - HV861 |
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