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HTA20003R3SEM Datasheet(PDF) 7 Page - International Rectifier |
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HTA20003R3SEM Datasheet(HTML) 7 Page - International Rectifier |
7 / 14 page www.irf.com 7 HTA-SERIES (185°C, 200V Input, Single/Dual Output) This feature is available only for single output models. Connection of the + Sense and - Sense leads at a remotely located load permits compensation for resistive voltage drop between the converter output and the load when they are physically separated by a significant distance. This connection allows regulation to the placard voltage at the point of application. When the remote sensing features is not used, the sense leads should be connected to their respective output terminals at the converter. A combination of the compensation voltage drop and output voltage adjustment (described below in the ‘Output Voltage Adjustment’ section) is limited to 10% of the nominal output voltage. Technical Notes: Remote Sensing As an alternative to application and removal of the DC voltage to the input, the user can control the converter output by providing TTL compatible, positive logic signal to Enable pin (pin 4) and to Input Return (pin 2). Enable signal is internally pulled “high” so that when not used, an open connection on the Enable pin permits normal converter operation. When its use is desired, a logical “low” on this port will shut the converter down. Inhibiting Converter Output Synchronization of Multiple Converters When operating multiple converters, system requirements often may require operation of the converters at a common frequency. To accommodate this requirement, the HTA series of converters provide both a synchronization input and output. The Sync Input port permits synchronization of a HTA connverter to any compatible external frequency source operating between 500kHz and 650kHz. This input signal should be referenced to the Input Return and have a 10% to 90% duty cycle. Compatibility requires transition times less than100ns, maximum low level of +0.8V and a minimum high level of +2.0V. The Sync Output of another converter which has been designated as the master oscillator provides a convenient frequency source for this mode of operation. When external synchronization is not required, the Sync In pin should be left unconnected thereby permitting the converter to operate at its own internally set frequency. The sync output signal is a continuous pulse train set at 550 ± 50kHz, with a duty cycle of 15 ± 5.0%. This signal is referenced to the Input Return and has been tailored to be compatible with the HTA Sync Input port. Transition times are less than 100ns and the low level output impedance is less than 50 Ω. This signal is active when the DC input voltage is within the specified operating range and the converter is not inhibited. This output has adequate drive reserve to synchronize at least five additional converters. Output Voltage Adjust - Single Output Models In addition to permitting close voltage regulation of remotely located loads, it is possible to utilize the converter sense pins to incrementally increase the output voltage. The increased output voltage is limited to 10% maximum. The adjustments made possible by this method are intended as a means to “trim” the output to a voltage setting for certain design application, but are not intended to create an adjustable output converter. These output voltage setting variations are obtained by connecting a resistor with an appropriate value between the +Sense and -Sense pins while connecting the -Sense pin to the Output Return pin as shown in Fig IV below. The resistance value for a desired output voltage can be determined by use of the equation presented below. R = 100 - -.025 adj NOM OUT NOM • ⎧ ⎨ ⎩ ⎫ ⎬ ⎭ V VV Where V NOM = device nominal output voltage, and V OUT = desired output voltage Finding a resistor value for a particular output voltage, is simply a matter of substituting the desired output voltage and the nominal device voltage into the equation and solving for the corresponding resistor value. Under no circumstance should R ADJ be less than 500Ω. Fig 4. Connection for V OUT Adjustment N/C Trim + Sense - Sense Output Return + Output To Load RADJ HTA200XXS |
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