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DCR02 Datasheet(PDF) 5 Page - Burr-Brown (TI) |
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DCR02 Datasheet(HTML) 5 Page - Burr-Brown (TI) |
5 / 12 page DCR02 SERIES SBVS028A − DECEMBER 2000 − REVISED APRIL 2004 www.ti.com 5 FUNCTIONAL DESCRIPTION OVERVIEW The DCR02 series offers isolation from an unregulated power supply operating from a choice of input voltages. This series provides a variety of regulated output voltages at a nominal output power of 2W. POWER STAGE The input supply is chopped at a frequency of 400kHz (internal oscillator divided by 2), which is used to drive the center-tapped toroidal transformer. RECTIFICATION The transformer output is full wave rectified and smoothed by the external capacitor connected to VREC. REGULATOR The internal low-dropout regulator provides a well-regulated output voltage throughout the operating range of the device. OSCILLATOR AND WATCHDOG The DCR02 uses an internal saw-tooth generator to provide the 800kHz onboard oscillator that is used to drive the power switching circuit. The operation of the oscillator is monitored by the watchdog, which will tri-state the output driver circuit if the oscillator fails or if the SYNC pin is taken low (shutdown mode). When the SYNC pin is returned high, normal operation resumes. SYNCHRONIZATION If more than one DCR02 is being used, beat frequencies and other electrical interference can be generated. This interference is due to the small variations in switching frequencies between the converters. The DCR02 overcomes this by allowing devices to be synchronized to one another. Up to eight devices can be synchronized by connecting the SYNC pins together, with care being taken to minimize the capacitance of tracking. Significant stray capacitance on the SYNC pin reduces the frequency of the internal oscillator. If this reduction is large, the DCR02 may be taken out with its optimized operating parameters, and saturation of the magnetics may result, damaging the device. If devices are synchronized, it should be noted that all devices will draw maximum current simultaneously at start up. This can cause the input voltage to dip. Should it fall below the minimum input voltage, the devices may not start up. A low equivalent series resistance (ESR) 2.2 µF ceramic capacitor should be connected as close to the device input pins as possible. If more than eight devices are required to be synchronized, it is recommended that external synchronization be used. Details of this procedure are contained in application report SBAA035, External Synchronization of the DCP01/02 Series of DC/DC Converters, available for download at www.ti.com. CONSTRUCTION The DCR02 is manufactured using the same technology as standard IC packages. There is no substrate within the package. The DCR02 is constructed using a driver IC, low-dropout voltage regulator, rectifier diodes, and a wound magnetic toroid, all mounted on a leadframe. The DCR02 requires no special printed circuit board (PCB) assembly processing, since there is no solder within the package. The result is an isolated DC/DC converter with inherently high reliability. |
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