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Minimum input-output voltage of regulator. Because the LM is a three-terminal device it is not pos- sible to provide true remote dtasheet sensing Load regulation will be limited by the resistance of the output pin and the wire connecting the regulator to the load For the data sheet specification regulation is measured 1 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. For output voltages other than 5V multiply ver- tical scale readings by V. The LM is a 10 amp regulator adjustable from 1 25V to 15V which uses a revolutionary new IC fabrication structure to combine high power discrete transistor technology with modern monolithic linear IC processing This combination yields a high-performance single-chip regulator capable of supplying in excess datashete 10 amps and operating at power lev- els up to 70 watts The regulators feature on-chip trimming of reference voltage to.
Internal current and power limiting.
LMK Datasheet PDF – National ->Texas Instruments
Ripple rejection at the normal ripple frequency of Hz is a function of both electrical and thermal effects in the LM If the adjustment pin is not bypassed with a capaci- tor it is also dependent on output voltage A 25 mF capaci- tor from the adjustment pin to ground will make ripple rejec- tion independent of output voltage for frequencies above Hz If lower ripple frequencies are encountered the ca- pacitor should be increased proportionally.
Total voltage drop across output wire and connector should not exceed 0 3V. Regulation can be improved by adding an LM reference diode to increase the effective reference voltage to 3 75V Load and line regulation are improved by 3 1 including thermal effects. Ripple rejection is measured with the adjustment pin bypassed with 25 mF capacitor and is therefore independent of output voltage With no load or. C3 improves ripple rejection output imped- ance and noise C2 should be 1 mF or larger close to the regulator if C3 is used.
C National Semiconductor Corporation. Output is short circuit protected. ModelSim – How to force a struct type written in SystemVerilog? How do you get an MCU design to market quickly? As ddatasheet by maximum junction temperature. R3 watts Regulator power dissipa. You can use for higher output voltage but the difference between Vin-Vout should not exceed the specifications at the recommended Junction Temperature.
Thermal resistance from junction to ambient i. Consider reading this before posting: F solid tantalum if significant improvements in high fre. Lead Temperature Soldering 10 seconds. If you look page 9 of the datasheet it gives you the complete information and calculating R3.
The factor of 1 1 is only an approximate factor accounting for load regula. Email cnjwge tevm2 nsc com. Direct paralleling of regulators is not normally recommend- ed because they do not share currents equally The regula- tor with the highest reference voltage will supply all the cur- daatsheet to the load until it current limits With an 18A load for instance one regulator might be operating in current limit at 16A while the second device is only carrying 2A Power dis- sipation in the high current regulator is extremely high with attendant high junction temperatures Long term reliability cannot be guaranteed under these conditions.
Tel a49 78 Because of its extremely high power dissipation capability the. Choosing IC with EN signal 1.
For best TC of V. R1 should be wirewound. ESD rating to be determined. Although power dissipation is datasueet limited electrical specifications apply only for power dissipation up to the limits shown Derating with temperature. Figure 5a will typically. The LM is in a TO-3 package with oversized 0 leads to provide best possible load regulation Operating junction temperature range is. Line regulation is measured on a short-pulse low-duty-cycle basis to maintain constant junction temperature Changes in output voltage due to thermal.
Dec 242: To obtain output noise multiply by. This is a worst-case l396k which includes all effects due to input voltage output current temperature and power dissipation Maximum power. 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 datashewt 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 lm396i available as standard items for 5V ap- plications at 5A 10A and 20A Other voltages are available on special request.
Using single 12V supply to deliver 12V and 5V Minimum load current of 10 mA is normally satisfied by the resistor divider which sets up output voltage. Hope it may help a bit, any further query is datasneet.
Fran ais Tel a49 93 R2 should be same type as R1 with TC track- ing of 30 ppm Dagasheet or better. A few words of caution 1 R3 power rating must be increased to V. Also i’m jst being curious; will the lm always deliver by default 5A, Irrespective of the current input from the dc source.
Here are few graphs for your reference for selecting heat sink without complex calculations: Last edited by deze4; 26th August at Power NPNs have low collecter resistance and do not require collector bond wires Collectors are all common to substrate Standard NPNs are still isolated.