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LX1692BIPW Datasheet(PDF) 4 Page - Microsemi Corporation |
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LX1692BIPW Datasheet(HTML) 4 Page - Microsemi Corporation |
4 / 13 page LX1692B PRODUCTION DATA SHEET Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 Copyright © 2005 Rev. 1.1, 12/20/2006 Full Bridge Resonant CCFL Controller TM ® FUNCTIONAL PIN DESCRI PTION (CONTINUED) Name Description OC_SNS Over current sense input. The OC_SNS input is compared to a 2V reference. The comparator output shuts off the PWM outputs to prevent possible secondary failures. The input voltage at this pin is not rectified. Normal operating voltage levels will be in the range of ±0.5V to VDDP. An abnormal voltage can operate continuously as high as ±7V peak under load fault conditions. Transients under fault conditions up to ±11 VPEAK are permitted. An input voltage above 4 peak but less than ±11V peak may cause saturation but will not cause malfunction, phase reversal, or reliability issues with the IC. OV_SNS Over Voltage Sense Input. This input pin monitors a voltage divider (approximately 1000:1) placed across the lamp. The open lamp voltage regulator uses it to regulate open circuit voltage. During both run and strike modes, fault detection comparators monitor voltage amplitude to determine if load opens occur. See functional description section for details on internal circuit operation. Frequency range of the input signal is from DC to 150KHz. Normal operating voltage levels will be in the range of ±0.5 to ±VDDP peak, centered about +0.2 VDC. An abnormal voltage can operate continuously as high as ±7V peak under load fault conditions. Transients under load fault conditions up to ±11V peak are permitted. An input voltage above ±4Vpk may cause saturation, but will not cause malfunction, phase reversal, or reliability issues with the IC ISNS Current Sense Input. The ISNS input is full wave rectified by an On-Chip circuit, then presented to the inverting input of the current error amplifier. Frequency range of the input signal is DC to 200KHz. The ISNS pin also monitors lamp current to determine if the lamp is ignited. If a single cycle at the ISNS pin is greater than 1V, the strike / run flip flop is clocked to the RUN state and threshold of the strike comparator is lowered to 0.3V. During RUN mode current levels are continuously monitored to detect less than 0.3V. A counter clocked by RMPD_OUT is reset each time current is sensed at this input. If the counter overflows (256 counts) a fault latch is set which shuts down the IC. This fault is expected to occur when the lamp is shorted to ground through an impedance of less than 2K ohms or the ISNS resistor itself is shorted. The counter is inhibited during digital dimming off time. Normal operating voltage levels will be in the range of ±0.5V to ±5.5V. An abnormal voltage can operate continuously as high as ±7V peak under load fault conditions. Transients under fault conditions up to ±11 VPK are permitted. Input voltages up 4V peak are linearly rectified. An input voltage above ±4V peak but less than ±11V peak may cause saturation but will not cause malfunction, phase reversal, or reliability issues with the IC. DOUT A buffer P-FET driver output. Has a 20K pull up, RDSON nominal = Ω 30 COUT A buffer P-FET driver output. Has a 20K pull up, RDSON nominal = Ω 30 BOUT A buffer N-FET driver output. Has a 20K pull down, RDSON nominal = Ω 30 AOUT A buffer N-FET driver output. Has a 20K pull down, RDSON nominal = Ω 30 GND Ground VDDP Input Supply Voltage, 4.5V to 5.5V input range. VDDP is switched (see ENABLE) to remove power from chip. An LDO regulator follows the switch and generates 4.0VDC. The output driver stages are powered directly from the VDDP input. The output capacitor should be a 1000nF or larger ceramic dielectric type. |
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