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GM11171.5TC3T Datasheet(PDF) 7 Page - Gamma Microelectronics Inc. |
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GM11171.5TC3T Datasheet(HTML) 7 Page - Gamma Microelectronics Inc. |
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7 / 13 page  Output Voltage Sensing The GM1117 are three terminal regulators. For which, they cannot provide true remote load sensing. Load regulation is limited by the resistance of the conductors connecting the regulator to the load. For best results the GM1117 should be connected are as shown in Figure 3. Calculating Power Dissipation and Heat Sink Requirements The GM1117 precision linear regulators include thermal shutdown and current limit circuitry to protect the de- vices. However, high power regulators normally oper- ate at high junction temperatures. It is important to cal- culate the power dissipation and junction temperatures accurately to be sure that you use and adequate heat sink. The case is connected to V on the GM1117, OUT and electrical isolation may be required for some appli- cations. Thermal compound should always be used with high current regulators like the GM1117. GM1117-3.3 V IN V OUT R LOAD R C GND V IN Conductor Parasitic Resistance (a) Fixed Version (b) Adjustable Version GM1117-Adj ADJ V OUT V IN V IN R C R LOAD R1 R2 (a),(b) Figure 3 Conductor Parasitic Resistance Effects are Minimized by this Grounding Scheme For Fixed and Adjustable Output Regulators 7 Protection Diodes When large external capacitors are used with most linear regulator, it is wise to add protection diodes. If the input voltage of the regulator is shorted, the out- put capacitor will discharge into the output of the reg- ulator. The discharge current depends on the value of capacitor, output voltage, and rate at which V IN drops. In the GM1117 linear regulators, the discharge path is through a large junction, and protection diodes are normally not needed. However, damage can occur if the regulator is used with large output capacitance values and the input voltage is instantaneously shorted to ground. In this case, a diode connected as shown above in Figure 2. (a),(b) Figure 2 Protection Diode Scheme for Large Output Capacitors (a) Fixed Version (b) Adjustable Version V IN V OUT C ADJ GM1117-Adj ADJ V IN V OUT C1 C2 R1 R2 GM1117-3.3 GND V IN V OUT C1 IN4002 C2 V IN V OUT IN4002 Conductor Parasitic Resistance A A MICROELECTRONICS GM1117 1.0A LOW DROPOUT PRECISION LINEAR REGULATORS Power Management |
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