TK11355BUIL データシートの表示（PDF） - Toko America Inc

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TK11355BUIL

VOLTAGE REGULATOR WITH ON/OFF SWITCH

Toko America Inc  

TK113xxBM/U

DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)

ON/OFF RESPONSE WITH CONTROL AND LOAD TRANSIENT RESPONSE

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 shows 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.

OUTPUT VOLTAGE RESPONSE

(OFF→ON)

ILOAD = 10 mA, CN = 1000 pF

CL = 0.33 µF

CL = 1.0 µF

CL = 1.5 µF

CL = 0.47 µF

-5

5 15 25 35 45

TIME (µs)

OUTPUT VOLTAGE RESPONSE

(OFF→ON)

CL = 2.2 µF

CN = 0.01 µF

CN = 0.1 µF

ILOAD = 30 mA

0 200 400 600 800

TIME (µs)

LOAD CURRENT STEP RESPONSE

ILOAD = 5 to 35 mA

30 to 60 mA

0 to 30 mA

CL = 0.33 µF

-5

5 15 25 35 45

TIME( µs)

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.

April 2000 TOKO, Inc.

Page 11

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