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TK11338BMCB Datasheet(PDF) 7 Page - TOKO, Inc |
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TK11338BMCB Datasheet(HTML) 7 Page - TOKO, Inc |
7 / 13 page May, 1997 TOKO, Inc. Page 7 TK113xxB DEFINITION AND EXPLANATION OF TECHNICAL TERMS OUTPUT VOLTAGE (V O) The output voltage is specified with V IN = (VO(TYP) + 1 V) and I O = 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 tempera- ture. OUTPUT CURRENT (I O MAX) The rated output current is specified under the condition where the output voltage drops 0.3 V below the value specified with I O = 30 mA. The input voltage is set to VO +1 V, and the current is pulsed to minimize temperature effect. CONTINUOUS OUTPUT CURRENT (I O) Normal operated output current. This is limited by package power dissipation. PULSE OUTPUT CURRENT (I O (PULSE)) Max pulsewidth 5ms, 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 = VO + 1V to VIN = VO + 6V. 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 = VO +1 V. The load regulation is specified under two output current step condi- tions of 1 mA to 60 mA and 1 mA to 100 mA. QUIESCENT CURRENT (IQ) The quiescent current is the current which flows through the ground terminal under no load conditions (I O = 0 mA) . RIPPLE REJECTION RATIO 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 = VO+ 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 Standby current is the current which flows into the regulator when the output is turned off by the control function (V CONT = V IN.) It is measured with VIN = 8 V (9 V for the 8 V output device.) SENSOR CIRCUIT Over current sensor The overcurrent sensor protects the device in the event that the output is shorted to ground. Thermal sensor The thermal sensor protects the device in the event that the junction temperature exceeds the safe value (T J = 150 °C). This temperature rise can be caused by external heat, excessive power dissipation caused by large input to output voltage drops, or excessive output current. The regulator will shut off when the tempera- ture exceeds the safe value. As the junction tempera- tures decrease, 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 capaci- tor 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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