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DCR012403P Datasheet(PDF) 10 Page - Texas Instruments |
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DCR012403P Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 19 page  DCR01 Series 10 SBVS013C FUNCTIONAL DESCRIPTION OVERVIEW The DCR01 series offers isolation from an unregulated power supply operating from a choice of input voltages. The DCR01s provide a variety of regulated output voltages at a nominal output power of 1W or above. 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’s output is full wave rectified and smoothed by the external capacitor connected to VREC. REGULATOR The internal low drop-out regulator provides a well-regu- lated output voltage, throughout the operating range of the device. OSCILLATOR AND WATCHDOG The DCR01 uses an internal saw-tooth generator to provide the 800kHz on-board 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 DCR01 is being used, beat frequencies and other electrical interference can be generated. This is due to the small variations in switching frequencies between the converters. The DCR01 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 will have the effect of reducing the frequency of the internal oscillator. If this is large, the DCR01 may be taken outside 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 2.2 µF capacitor (low ESR) should be connected as close to the device input pins as possible for the 5V input devices, and a 0.47 µF capacitor for the 12V and 24V devices. If more than eight devices are required to be synchronized, it is recommended that external synchronization be used. Details are contained in Texas Instruments Application Report literature number SBAA035 (AB-153) available at www.ti.com. CONSTRUCTION The DCR01 is manufactured using the same technology as standard IC packages. There is no substrate within the package. The DCR01 is constructed using a driver IC, low- dropout voltage regulator, rectifier diodes, and a wound magnetic toroid, all mounted on a leadframe. The DCR01 requires no special PCB assembly processing, as there is no solder within the package. The result is an isolated DC/DC converter with inherently high reliability. ADDITIONAL FUNCTIONS DISABLE/ENABLE The DCR01 can be disabled or enabled by driving the SYNC pin using an open drain CMOS gate. If the SYNC pin is pulled LOW, the DCR01 will be disabled. The disable time depends upon the external loading. The internal disable function is implemented in 2 µs. Removal of the pull down will enable the DCR01. Capacitance loading on the SYNC pin should be minimized in order to prevent a reduction in the internal oscillator‘s frequency. See Application Report (SBAA035) “External Synchronization of the DCP01/02 Series of DC/DC Con- verters”. This document contains information on how to null the effects of additional capacitance on the SYNC pin. The oscillator’s frequency can be measured at VREC, as this is the fundamental frequency of the ripple component. OUTPUT ENABLE/DISABLE The regulated output of the DCR01 can be disabled by pulling the ENABLE pin LOW (connect ENABLE to 0VOUT). Hold- ing the ENABLE pin HIGH (connect ENABLE to VREC) enables the regulated output voltage, thus allowing the output to be controlled from the isolated side, see Figure 1. DCR 01 V OUT V IN C IN NOTE: (1) 2.2 µF capacitor with low ESR for 5V devices and 0.47 µF for 12V and 24V devices. C OUT = 0.1µF R ERR = 10kΩ R EN = 10kΩ C FILTER = 1µF V O1 0V OUT 0V ENABLE V REC ERROR V S U1 0V SYNC ERROR SW1 see text FIGURE 1. DCR01 with a Single Output. |
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