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TK70403 Datasheet(PDF) 6 Page - TOKO, Inc |
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TK70403 Datasheet(HTML) 6 Page - TOKO, Inc |
6 / 10 page Page 6 January 1999 TOKO, Inc. TK70403 DEFINITION AND EXPLANATION OF TECHNICAL TERMS OUTPUT VOLTAGE (V OUT) The output voltage is specified with V IN = VOUT(TYP) + 0.4 and I OUT = 2 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 value is reduced. It is dependent upon the load current and the temperature. OUTPUT CURRENT (I OUT(MAX)) The rated output current is specified under the condition where the output voltage drops 0.4 V when the output current is loaded. The input voltage is set to V OUT + 0.4 V. LINE REGULATION (Line Reg) Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The voltage is pulsed to minimize temperature effects. 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 pulsed to minimize temperature effects. The load regulation is specified to 0.1 mA to 5.0 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 (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 50 mVp-p, 400 Hz, I OUT = 2 mA superimposed on the input voltage, where V IN = VOUT(TYP) + 0.4 V. The ripple rejection is the ratio of the output vs. input and is expressed in dB. ON/OFF CONTROL High is “on” (referenced to ground). When the on/off function is not used, connect the control terminal to V IN. The control current can be reduced by inserting a series resistor (R CONT) between the control terminal and VIN. Changes in the on/off level, due to this connection, are shown below. ON/OFF RESPONSE WITH CONTROL (SPEED) The turn-on time depends upon the value of the output capacitor and the noise bypass capacitor. The turn-on time will decrease with smaller value of either capacitor. The graph below shows the relationship between turn-on time and load capacitance. However, when the capacitance is small, load transient and line transient will worsen and the noise will increase. C L = 0.68 µF, CN = 1000 pF will be the best for fastest operation. VCONT (V) 2 0 1 2 1 0 VOUT = 1 M RCONT = 820 k VOUT = 680 k RISE TIME (µs) .1 µ 0 100 1000 .01 µ 0 CL = 2.2 µF 1000 pF 100 pF 10 pF CL = 0.45 µF CL = 4.7 µF CL = 0.68 µF |
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