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TK70001 Datasheet(PDF) 6 Page - TOKO, Inc |
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TK70001 Datasheet(HTML) 6 Page - TOKO, Inc |
6 / 8 page Page 6 January 1999 TOKO, Inc. TK70001 ON/OFF CONTROL CURRENT The characteristics of TK70001 change by the value of control current. Please refer to the electrical characteristics graphs on the data sheet and determine the optimum value. The standard measurement condition is I CONT = 50 µA. (The application is max. ICONT = 200 µA). In the condition where there is very little output current, connect the resistor R CONT to the control terminal (please consider the reduction of the terminal voltage, the resistance value, etc.). This current can be lowered. 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 drop, or excessive output current. The switch will shut off when the temperature exceeds the safe value. As the junction temperature decreases, the switch will begin to operate again. Under sustained fault conditions, the switch output will cycle as the device turns off, and then resets. Damage may occur to the device under extreme fault conditions. PACKAGE POWER DISSIPATION (P D) This is the power dissipation level at which the thermal sensor is activated. The IC contains an internal thermal sensor which monitors the junction temperature. When the junction temperature exceeds the monitor threshold of 150 °C, the IC is shut down. The junction temperature rises as the difference between the input power (V IN x IIN) and the output power (V OUT x IOUT) increases. The rate of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and the ambient temperature. When the IC mounting has good thermal conductivity, the junction temperature will be low even if the power dissipation is great. When mounted on the recommended mounting pad, the power dissipation of the SOT-26 is increased to 350 mW. For operation at ambient temperatures over 25 °C, the power dissipation of the SOT-26 device should be derated at 2.8 mW/ °C. To determine the power dissipation for shutdown when mounted, attach the device on the actual PCB and deliberately increase the output current (or raise the input voltage) until the thermal protection circuit is activated. Calculate the power dissipation of the device by subtracting the output power from the input power. These DEFINITION AND EXPLANATION OF TECHNICAL TERMS DROPOUT VOLTAGE (V DROP) The output voltage decreases with the increase of output current. It is dependent upon the load current and the junction temperature. The dropout voltage is the difference between the input voltage and the output voltage. The measurement current is I OUT = 50 mA. (ICONT = 50 µA, V IN = 2.5 V). OUTPUT CURRENT (I OUT) The rated output current is specified under the condition where the output voltage drops 0.5 V below the no load value. The input voltage is set to 2.5 V, and the current is pulsed to minimize temperature effects. QUIESCENT CURRENT (I Q) The quiescent current is the current which flows through the ground terminal under no load conditions (I OUT = 0 mA) with V IN = 2.5 V and excludes the control pin current. STANDBY CURRENT (I STBY) Standby current is the current which flows into the solid state switch when the output is turned off by the control function (V CONT = 0 V). It is measured with VIN = 8 V. 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. ON/OFF CONTROL High is “on” (referenced to ground). The input current is at the pA level by connecting the control terminal to ground. 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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