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DAC2812SE Datasheet(PDF) 5 Page - M.S. Kennedy Corporation |
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DAC2812SE Datasheet(HTML) 5 Page - M.S. Kennedy Corporation |
5 / 9 page APPLICATION NOTES POWER SUPPLIES The output voltage of the DAC2812S and DAC2815S may be adjusted from 90% to 110% of nominal value by the use of a 150K Ω potentiometer as shown. Adjustment beyond this range is possible however certain characteristics of the con- verter such as but not limited to input voltage range, efficiency, ripple and temperature performance will change. Characteriza- tion by the user is recommended in such applications. Adjust/comp (pin 4) may be driven by external circuitry refer- enced to pin 2 (-output) if desired. Grounding pin 4 causes voltage to increase (25% typically) while driving pin 4 above 1.3V causes output voltage to decrease. Pin 4 may be driven negative without damage, however the resultant increase in converter output voltage should be considered. Pin 4 may be driven through 10K Ω or more if connection of the comp func- tion is also required. The comp function of pin 4 allows load transient response to be tailored to suit specific application requirements. This fea- ture may be utilized by connecting a 10 or less nF capacitor between pins 4 and 1. Note: The DAC2812S and DAC2815S use pin 4 while the DHC2803S and DHC2805S use pin 3. Rev. C 7/04 5 SHUTDOWN PLUS Pin 5 is used for remote shutdown, output fault detection, and/or setting the input voltage point at which the converter will turn on as shown in the typical application diagram. No connection to pin 5 is necessary for normal operation of the converter. Pin 5 is referenced to the pin 7 (-input). Shutdown may be implemented by simply connecting pin 5 to an open collector logic output or switch rated at 2.5mA, 25Vdc or higher. Input voltage turn on point is programmed with a single resis- tor from pin 5 to 7. An input turn on/off hysteresis (typically 3.5% of Vin) will be observed. This should be considered when making or verifying set point adjustment. The value of the setpoint resistor may be determined by the following: R= (±10% accuracy at 25°C) Set point temperature coefficient is typically +400ppm/°C. Output fault monitoring is accomplished by observing pin 5 with a high impedance monitoring circuit. Pin 5 voltage drops from over 10V to below 1V when a load fault causes the con- verters fault protection circuitry to activate. It will remain low for at least 100mS and return high. If the load fault is still present pin 5 will return low and the cycle will repeat. A resis- tor >400K Ω from pin 5 to 7 provides pull down for pin 5 if there is no input setpoint programming resistor already in place. 210·10³ ETO-9.5 LOAD FAULT RESPONSE The MSK families of DC-DC converters share load fault phi- losophies. Load fault conditions include short-circuit and se- vere overload conditions. The DAC2800S converter series re- sponds to load faults by turning off all power conversion cir- cuits for 250mS and then attempting to restart for 10mS (typi- cal). The net "on" duty factor during a fault is very low result- ing in low converter dissipation and immunity from overheating at 125°C. Current beyond rated can flow into the load at startup time. This allows the converter to bring up capacitive and other difficult load types more reliably than competing con- verters. |
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