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TK73200 Datasheet(PDF) 7 Page - TOKO, Inc |
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TK73200 Datasheet(HTML) 7 Page - TOKO, Inc |
7 / 12 page June 1999 TOKO, Inc. Page 7 TK73200 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, the external transistor and the junction temperature. BASE CONTROL CURRENT (I BASE) The base control current is the drive current for the base of the external transistor. OUTPUT CURRENT (I OUT) The output current depends on the characteristics of the external transistor and current limit setting. 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. Load regulation depends on the external transistor. QUIESCENT CURRENT (I Q) The quiescent current is the current which flows through the ground terminal under no load conditions (I OUT = 0 mA) and excludes the control pin current. 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 100 mVrms, 400 Hz superimposed on the input voltage, where V IN = VOUT(TYP) + 1.5 V. The output decoupling capacitor is set to 10 µF, the noise bypass capacitor is set to 0.1 µF, and the load current is set to 30 mA. Ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in dB. STANDBY CURRENT (I STBY) Standby current is the current which flows into the regulator when the output is turned off by the control function (V CONT = 0 V). It is measured with VIN = 8 V. 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 external voltage higher than the input voltage is applied to the output side. |
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