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TK71532SCL Datasheet(PDF) 8 Page - TOKO, Inc |
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TK71532SCL Datasheet(HTML) 8 Page - TOKO, Inc |
8 / 13 page Page 8 January 1999 TOKO, Inc. TK715xx DEFINITION AND EXPLANATION OF TECHNICAL TERMS OUTPUT VOLTAGE (V OUT) The output voltage is specified with V IN = (VOUT(TYP) + 1 V) and I OUT = 30 mA. DROPOUT VOLTAGE (V DROP) The dropout voltage is the difference between the input voltage and the output voltage at which point the regulator starts to fall out of regulation. Below this value, the output voltage will fall as the input voltage is reduced. It is dependent upon the load current and the junction temperature. CONTINUOUS OUTPUT CURRENT (I OUT) Normal operating output current. This is limited by package power dissipation. PULSE OUTPUT CURRENT (I OUT(PULSE)) Maximum pulse width 5 ms at V OUT above 2.0 V, duty cycle 12.5%: pulse load only. LINE REGULATION (Line Reg) Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The line regulation is specified as the input voltage is changed from V IN = VOUT(TYP) + 1 V to VIN = VOUT(TYP) + 6 V or VIN = max 14 V. LOAD REGULATION (Load Reg) Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. It is a pulsed measurement to minimize temperature effects with the input voltage set to V IN = VOUT(TYP) +1 V. The load regulation is specified under two output current step conditions of 1 mA to 60 mA and 1 mA to 100 mA. QUIESCENT CURRENT (I Q) The quiescent current is the current which flows through the ground terminal under no load conditions (I OUT = 0 mA). GROUND CURRENT (I GND) Ground current is the current which flows through the ground pin(s). It is defined as I IN - IOUT, excluding control current. RIPPLE REJECTION RATIO (RR) Ripple rejection is the ability of the regulator to attenuate the ripple content of the input voltage at the output. It is specified with 200 mVrms, 100 Hz superimposed on the input voltage, where V IN = VOUT(TYP) + 2.0 V. The output decoupling capacitor is set to 4.7 µF and the load current is set to 5 mA. Ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in dB. REVERSE VOLTAGE PROTECTION Reverse voltage protection prevents damage due to the output voltage being higher than the input voltage. This fault condition can occur when the output capacitor remains charged and the input is reduced to zero, or when an external voltage higher than the input voltage is applied to the output side. REDUCTION OF OUTPUT NOISE Although the architecture of the Toko regulators are designed to minimize semiconductor noise, further reduction can be achieved by the selection of external components. The obvious solution is to increase the size of the output capacitor. Please note that several parameters are affected by the value of the capacitors and bench testing is recommended when deviating from standard values. PACKAGE POWER DISSIPATION (P D) This is the power dissipation level at which the thermal sensor is activated. The IC contains an internal thermal sensor which monitors the junction temperature. When the junction temperature exceeds the monitor threshold of 150 °C, the IC is shut down. The junction temperature rises as the difference between the input power (V IN x IIN) and the output power (V OUT x IOUT) increases. The rate of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and the ambient temperature. When the IC mounting has good thermal conductivity, the junction temperature will be low even if the power dissipation is great. When mounted on the recommended mounting pad, the power dissipation of the SOT-23-3 is increased to 350 mW. For operation at ambient temperatures over 25 °C, the power dissipation of the SOT-23-3 device should be derated at 2.8 mW/ °C. To |
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