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ART2815TEMA Datasheet(PDF) 6 Page - International Rectifier |
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ART2815TEMA Datasheet(HTML) 6 Page - International Rectifier |
6 / 12 page 6 www.irf.com ART28XXT SERIES Figure I. Block Diagram Circuit Description and Application Information The ART28XXT series of converters have been designed using a single ended forward switched mode converter topology. (refer to Figure I.) Single ended topologies enjoy some advantage in radiation hardened designs in that they eliminate the possibility of simultaneous turn on of both switching elements during a radiation induced upset; in addition, single ended topologies are not subject to transformer saturation problems often associated with double ended implementations. The design incorporates a two-stage LC input filter to attenuate input ripple current. A low overhead linear bias regulator is used to provide bias voltage for the converter primary control logic and a stable, well regulated reference for the error amplifier. Output control is realized using a wide band discrete pulse width modulator control circuit incorporating a unique non-linear ramp generator circuit. This circuit helps stabilize loop gain over variations in line voltage for superior output transient response. Nominal conversion frequency has been selected as 250 KHz to maximize efficiency and minimize magnetic element size. Output voltages are sensed using a coupled inductor and a patented magnetic feedback circuit. This circuit is relatively insensitive to variations in temperature, aging, radiation and manufacturing tolerances making it particularly well suited to radiation hardened designs. The control logic has been designed to use only radiation tolerant components, and all current paths are limited with series resistance to limit photo currents. Other key circuit design features include short circuit protection, undervoltage lockout and an external synchronization port permitting operation at an externally set clock rate. Operating Guidelines Thermal Considerations The ART series of converters is capable of providing relatively high output power from a package of modest volume. The power density exhibited by these devices is obtained by combining high circuit efficiency with effective methods of heat removal from the die junctions. Good design practices have effectively addressed this requirement inside the device. However when operating at maximum loads, significant heat generated at the die junctions must be carried away by conduction from the base. To maintain case temperature at or below the specified maximum of 125°C, this heat can be transferred by attachment to an appropriate heat dissipater held in intimate contact with the converter base-plate. The circuit topology used for regulating output voltages in the ART28XXT series of converters was selected for a number of reasons. Significant among these is the ability to simultaneously provide adequate regulation to three output voltages while maintaining modest circuit complexity. These attributes were fundamental in retaining the high reliability and insensitivity to radiation that characterizes device performance. Use of this topology dictates maintaining the minimum load specified in the electrical tables on each output. Operating the converter without a load on any output will result in peak charging to an output voltage well above the specified voltage regulation limits, potentially in excess of ratings, and should be avoided. Output load currents less than specification minimums will result in regulation performance that exceeds the limits presented in the tables. In most practical applications, this lower bound on the load range does not present a serious constraint; however the user should be mindfull of device performance when operated outside specified limits. 11 10 9 13 14 Sample Hold +12/+15 Vdc Output +12/+15 Vdc Output Return -12/-15 Vdc Output +5 Vdc Output +5 Vdc Output Return Short Circuit Pulse Width Modulator Primary Bias & Reference EMI Filter Under-Voltage Detector 1 3 4 2 +Input Enable Sync In Input Return 5 Sync Out |
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