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LM196K Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM196K Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 14 page Electrical Characteristics (Note 1) (Continued) Parameter Conditions LM196 LM396 Units Min Typ Max Min Typ Max Power Dissipation (PMAX) 70V s VIN b VOUT s 12V 70 100 70 100 W (Note 11) VIN b VOUT e 15V 50 50 W VIN b VOUT e 18V 36 36 W Drop-Out Voltage IOUT e 10A 21 25 21 25 V LM196LM396 Full Temperature Range 275 275 Note 1 Unless otherwise stated these specifications apply for Tj e 25 C VIN b VOUT e 5V IOUT e 10 mA to 10A Note 2 This is a worst-case specification which includes all effects due to input voltage output current temperature and power dissipation Maximum power (PMAX) is specified under Electrical Characteristics Note 3 Line regulation is measured on a short-pulse low-duty-cycle basis to maintain constant junction temperature Changes in output voltage due to thermal gradients or temperature changes must be taken into account separately See discussion of Line Regulation under Application Hints Note 4 Load regulation on the 2-pin package is determined primarily by the voltage drop along the output pin Specifications apply for an external Kelvin sense connnection at a point on the output pin from the bottom of the package Testing is done on a short-pulse-width low-duty-cycle basis to maintain constant junction temperature Changes in output voltage due to thermal gradients or temperature changes must be taken into account separately See discussion of Load Regulation under Application Hints Note 5 Ripple rejection is measured with the adjustment pin bypassed with 25 mF capacitor and is therefore independent of output voltage With no load or bypass capacitor ripple rejection is determined by line regulation and may be calculated from RR e 20 log10 100(K c VOUT) where K is line regulation expressed in %V At frequencies below 100 Hz ripple rejection may be limited by thermal effects if load current is above 1A Note 6 Thermal regulation is defined as the change in output voltage during the time period of 02 ms to 20 ms after a change in power dissipation in the regulator due to either a change in input voltage or output current See graphs and discussion of thermal effects under Application Hints Note 7 Adjustment pin current change is specified for the worst-case combination of input voltage output current and power dissipation Changes due to temperature must be taken into account separately See graph of adjustment pin current vs temperature Note 8 Current limit is measured 10 ms after a short is applied to the output DC measurements may differ slightly due to the rapidly changing junction temperature tending to drop slightly as temperature increases A minimum available load current of 10A is guaranteed over the full temperature range as long as power dissipation does not exceed 70W and VIN b VOUT is less than 70V Note 9 Minimum load current of 10 mA is normally satisfied by the resistor divider which sets up output voltage Note 10 Total thermal resistance junction-to-ambient will include junction-to-case thermal resistance plus interface resistance and heat sink resistance See discussion of Heat Sinking under Application Hints Note 11 Although power dissipation is internally limited electrical specifications apply only for power dissipation up to the limits shown Derating with temperature is a function of both power transistor temperature and control area temperature which are specified differently See discussion of Heat Sinking under Application Hints For VIN b VOUT less than 7V power dissipation is limited by current limit of 10A Note 12 Dropout voltage is input-output voltage differential measured at a forced reference voltage of 115V with a 10A load and is a measurement of the minimum inputoutput differential at full load Application Hints Further improvements in efficiency can be obtained by using Schottky diodes or high efficiency diodes with lower forward voltage combined with larger filter capacitors to reduce rip- ple However this reduces the voltage difference between input and drive pins and may not allow sufficient voltage to fully saturate the pass transistor Special transformers are available from Signal Transformer that have a 1V tap on the output winding to provide the extra voltage for the drive pin The transformers are available as standard items for 5V ap- plications at 5A 10A and 20A Other voltages are available on special request Heat Sinking Because of its extremely high power dissipation capability the major limitation in the load driving capability of the LM196 is heat sinking Previous regulators such as LM109 LM340 LM117 etc had internal power limiting circuitry which limited power dissipation to about 30W The LM196 is guaranteed to dissipate up to 70W continuously as long as the maximum junction temperature limit is not exceeded This requires careful attention to all sources of thermal re- sistance from junction-to-ambient including junction-to- case resistance case-to-heat sink interface resistance (01 – 10 CW) and heat sink resistance itself A good ther- mal joint compound such as Wakefield type 120 or Thermal- loy Thermocote must be used when mounting the LM196 especially if an electrical insulator is used to isolate the reg- ulator from the heat sink Interface resistance without this compound will be no better than 05 CW and probably much worse With the compound and no insulator interface resistance will be 02 CW or less assuming 0005 or less combined flatness run-out of TO-3 and heat sink Proper torquing of the mounting bolts is important to achieve mini- mum thermal resistance Four to six inch pounds is recom- mended Keep in mind that good electrical as well as ther- mal contact must be made to the case 3 |
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