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GM6250-4.0T92RLG Datasheet(PDF) 9 Page - Gamma Microelectronics Inc. |
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GM6250-4.0T92RLG Datasheet(HTML) 9 Page - Gamma Microelectronics Inc. |
9 / 14 page 9 GM6250 300mA ULTRA LOW DROPOUT POSITIVE VOLTAGE REGULATOR Application Note Notes on Usage 1. It is recommended to operate the GM6250 series within the stipulated absolute maximum ratings as the IC is liable to malfunction it is operated outside the ratings. 2. There is a possibility of heat or oscillation as a result of the impedance present between the power supply and the IC's input. Where impedance is greater 10Ω, it is recommend to use a capacitor (CIN) of at least 1µF at the input terminal. 3. With a large output current, operations can be stabilized by increasing capacitor size (CIN). If CIN is too small and capacitance of (CL) is increased, there is a possibility of oscillation due to input impedance. In such case, operation can be stabilized by either increasing the size of CIN or decreasing the size of CL. 4. Please ensure the output current (IOUT) is less than Pd ÷ (VIN - VOUT) and does not exceed the stipulated continuous for total power dissipation value (Pd) for the package. CALCULATING POWER DISSIPATION The GM6250 series precision linear regulators include thermal shutdown and current limit circuitry to protect the devices. However, high power regulators normally operate at high junction temperatures so it is important to calculate the power dissipation and junction temperatures accurately to be sure that you use and adequate heat sink. The thermal characteristics of an IC depend four factors: 1. Maximum Ambient Temperature T A (℃) 2. Power Dissipation P D (Watts) 3. Maximum Junction Temperature T J (℃) 4. Thermal Resistance Junction to ambient R JA (℃/W) These relationship of these four factors is expressed by equation : T J = TA + PD X RJA Maximum ambient temperature and power dissipation are determined by the design while the maximum junction temperature and thermal resistance depend on the manufacturer and the package type. |
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