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TK73230 Datasheet(PDF) 9 Page - TOKO, Inc |
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TK73230 Datasheet(HTML) 9 Page - TOKO, Inc |
9 / 16 page January 1999 TOKO, Inc. Page 9 TK732xx 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 (9 V for the 8 V output device). REMOTE SENSING (V SENSE) The V SENSE pin is the output voltage sensing pin. If the voltage drop to the load caused by the PCB etch resistance cannot be disregarded, the voltage drop can be compensated by connecting the V SENSE pin as shown below. The length of the V SENSE etch should be limited to 30 cm (11.8 in.) maximum. COLLECTOR VOUT EMITTER BASE RIPK CL EXTERNAL TRANSISTOR TK732XX |
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