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TK11148S Datasheet(PDF) 10 Page - TOKO, Inc |
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TK11148S Datasheet(HTML) 10 Page - TOKO, Inc |
10 / 16 page Page 10 March 1999 TOKO, Inc. TK111xxS 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. REDUCTION OF OUTPUT NOISE Although the architecture of the Toko regulators is designed to minimize semiconductor noise, further reduction can be achieved by the selection of external components. The obvious solution is to increase the size of the output capacitor. A more effective solution would be to add a capacitor to the noise bypass terminal. The value of this capacitor should be 0.1 µF or higher (higher values provide greater noise reduction). Although stable operation is possible without the noise bypass capacitor, this terminal has a high impedance and care should be taken to avoid a large circuit area on the printed circuit board when the capacitor is not used. Please note that several parameters are affected by the value of the capacitors and bench testing is recommended when deviating from standard values. CONTROL FUNCTION The TK111xxS has an active high control pin. The control pin requires over 1.8 V for operation and under 0.6 V for standby. For the range of 0.6 V < V CONT < 1.8 V, operation is undefined. If the control function is not used, connect the control pin to V IN. DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.) SW CN VIN OUTPUT VOLTAGE RESPONSE A (OFF →ON) -5 5 25 15 35 CL = 0.47µF 45 CL = 0.68 µF CL = 1.5 µF CL = 1.0 µF TIME (µs) ILOAD = 30 mA, CN = 3300 pF OUTPUT VOLTAGE RESPONSE B (OFF →ON) 02 6 48 CN = 0.47 µF CN = 0.33 µF CN = 0.68µF CN = 1.0 µF TIME (ms) ILOAD = 30 mA, CL = 2.2 µF CN = 0.1 µF CONTROL FUNCTION ON/OFF RESPONSE WITH CONTROL The turn-on time depends upon the value of the output capacitor and the noise bypass capacitor. The turn-on time will increase with the value of either capacitor. The graphs below show the relationship between turn-on time and load capacitance. If the value of these capacitors is reduced, the load and line regulation will suffer and the noise voltage will increase. If the value of these capacitors is increased, the turn-on time will increase. |
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