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TJ3966GRS-1.8V-3L Datasheet(PDF) 8 Page - HTC Korea TAEJIN Technology Co. |
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TJ3966GRS-1.8V-3L Datasheet(HTML) 8 Page - HTC Korea TAEJIN Technology Co. |
8 / 11 page 3.0A Ultra Low Dropout Linear Regulator TJ3966 Aug. 2010 - Rev. 1.7.1 - 8 - HTC APPLICATION INFORMATION Output Adjustment (Adjustable Version) An adjustable output device has output voltage range of 1.145V to 5.0V. To obtain a desired output voltage, the following equation can be used with (R1+R2) resistor range of 1kΩ to 100kΩ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = 1 1.145 V R1 R2 OUT To enhance output stability, a capacitor of 68pF to 100pF can be placed in series with VOUT and ADJ. SENSE Pin In applications where the regulator output is not very close to the load, the TJ3966 can provide better remote load regulation characteristics using the SENSE pin. TJ3966 regulates the voltage at the output pin. Hence, the voltage at the remote load will be lower than the voltage at the output pin as a value of the voltage drop across the trace series resistance. If the sense option pin is not required, the sense pin must be connected to the VOUT pin. Connecting the sense pin to the remote load will provide regulation at the remote load because the TJ3966 regulates the voltage at the sense pin when the sense option pin is used. Output Capacitor The TJ3966 requires a proper output capacitance to maintain stability and improve transient response over current. The ESR of the output capacitor within the limits of 0.5Ω to 10Ω is required. A minimum capacitance value of 22µF of tantalum or aluminum electrolytic capacitor is recommended. In a case of ceramic capacitor, a minimum capacitance value of 10µF is required and additional resistance of minimum 1Ω should be added with the output capacitor in series to maintain its minimum ESR. The resistance and capacitance have to be varied upon the load current. VOUT ADJ GND R2 R1 22µF OUTPUT + - VOUT ADJ GND R2 R1 10µF OUTPUT Additional Resistance |
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