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TK11142MCL Datasheet(PDF) 9 Page - TOKO, Inc |
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TK11142MCL Datasheet(HTML) 9 Page - TOKO, Inc |
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9 / 16 page  March 1999 TOKO, Inc. Page 9 TK111xxM 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 = 10 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. OUTPUT CURRENT (I OUT(MAX)) The rated output current is specified under the condition where the output voltage drops 0.3 V below the value specified with I OUT = 10 mA. The input voltage is set to V OUT +1 V, and the current is pulsed to minimize temperature effect. CONTINUOUS OUTPUT CURRENT (I OUT) Normal operating output current. This is limited by the package power dissipation. PULSE OUTPUT CURRENT (I OUT (PULSE)) Max pulse width 5 ms, 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. 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 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, 1 kHz superimposed on the input voltage, where V IN = VOUT + 2 V. The output decoupling capacitor is set to 4.7 µF, the noise bypass capacitor is set to 0.01 µF, 0.1 µF, 1.0 µF and the load current is set to 10 mA. Ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in dB. Example: 64 dB at C N = 0.01 µF, 70 dB at C N = 0.1 µF, 74 dB at CN = 1.0 µF SENSOR CIRCUITS Overcurrent Sensor The overcurrent sensor protects the device if the output is shorted to ground. Thermal Sensor The thermal sensor protects the device if the junction temperature exceeds the safe value (T j = 150 °C). This temperature rise can be caused by extreme heat, excessive power dissipation caused by large output voltage drops, or excessive output current. The regulator will shut off when the temperature exceeds the safe value. As the junction temperature decreases, the regulator will begin to operate again. Under sustained fault conditions, the regulator output will oscillate as the device turns off then resets. Damage may occur to the device under extreme fault conditions. 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 |
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