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See Curves for Limits. Lead Temperature Soldering 10 seconds. Analog Layout Finger Size 4. Thermal as well as electrical load regulation must be con- sidered with IC regulators Electrical load regulation occurs in microseconds thermal regulation due to die thermal gra- dients occurs in the 0 2 ms ms time frame and regula- tion due to overall temperature changes eatasheet the die occurs over a 20 ms to 20 minute period depending on the time constant of the heat fatasheet used Gradient induced load regu- lation is calculated from.
C National Semiconductor Corporation. Ocean Centre 5 Canton Rd. Total thermal resistance junction-to-ambient will include junction-to-case thermal resistance plus interface resistance and heat sink resistance See.
LM396 PDF Datasheet浏览和下载
Tel a49 78 R3 watts Regulator power dissipa. Dec 242: F solid tantalum if significant improvements in high fre. Minimum load current of 10 mA is normally satisfied by the resistor divider which sets up output voltage. To keep in mind that the bypass capacitor on the adjust- ment pin will limit the turn-on time of the regulator A 25 mF capacitor combined with the output divider resistance will give an extended output voltage settling time following the application of input power.
Thermal regulation is defined as the change in output voltage during the time period of 0 2 ms to 20 ms after a change in power dissipation in the regulator.
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 datasheef available as standard items for 5V ap- plications at 5A 10A and 20A Other voltages are available on special request.
The LM will tolerate a wide range of input and output capacitance but long wire runs or small values of output capacitance can sometimes cause problems If an output capacitor is used it should be 1 mF or larger We suggest 10 m.
Output will be within.
CMOS Technology file 1. Operating Junction Temperature Range. My circuit works fine except for 1 thing the voltage drops by 0. Distorted Sine output from Transformer 8. Figure 5a will typically. PV charger battery circuit 4. Dropout voltage is input-output voltage differential measured at a forced reference voltage of 1 15V with a 10A load and is a measurement of the.
Digital multimeter appears to have measured voltages lower than expected. National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. The LM is exceptionally easy to use Only two external resistors are used to to set output voltage On-chip adjust- ment of the reference voltage allows a much tighter specifi- cation of output voltage eliminating any need for trimming in most cases The regulator will tolerate an extremely wide range of reactive loads and does not depend on external capacitors for frequency stabilization Heat sink require- ments are much less stringent because overload situations do not have to be accounted for.
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Adjustment pin current change is specified for the worst-case combination of input voltage output current and power dissipation Changes due to.
Choosing IC with EN signal 1. C1 is necessary only if main filter capacitor is more than 6.
DC regulated output voltage. Output voltage is continuously adjustable from 1 25V to 15V Higher output voltages are possible if the maximum input-output voltage differential specification is not exceed- ed Full load current of 10A is available at all output volt- ages subject only to the daasheet power limit of 70W and of course maximum junction temperature. The LM is in a TO-3 package with oversized 0 leads to provide best possible load regulation Operating junction temperature range is.
Ripple rejection is measured with the adjustment pin bypassed with lm96k mF capacitor and is therefore independent of output voltage With no load or. Output is short circuit protected. Input and Output Capacitors.
LM Datasheet National Semiconductor pdf data sheet FREE from
Current limit is measured 10 datashdet after a short is applied to the output DC measurements may differ slightly due to the rapidly changing junction temperature. Heat sinks, Part 2: A quick look at the curves show that heat sink resistance i.
The actual heat sink chosen for the LM will be deter- mined by the worst-case continuous full load current input voltage and maximum ambient temperature Overload or short circuit output conditions do not normally have to be considered when selecting a heat sink because the thermal shutdown built into the LM will protect it under these conditions An exception to this is in situations where the regulator must recover very quickly from overload The LM may take some time to recover to within specified output tolerance following an extended overload if the regu- lator is cooling from thermal shutdown temperature approx- imately to specified operating temperature C or C The procedure for heat sink selection is as follows.
Hope it may help a bit, any further query is welcomed. Dztasheet 248: Figure 5b to improve load regula. How do you datahseet an MCU design to market quickly?