TK11120S Ver la hoja de datos (PDF) - Toko America Inc

Número de pieza

componentes Descripción

Fabricante

TK11120S

VOLTAGE REGULATOR WITH ON/OFF SWITCH

Toko America Inc  

TK111xxS

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

OUTPUT VOLTAGE (VOUT)

The output voltage is specified with VIN = (VOUT(TYP) + 1 V)

and IOUT = 10 mA.

DROPOUT VOLTAGE (VDROP)

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

temperature.

OUTPUT CURRENT (IOUT(MAX))

The rated output current is specified under the condition

where the output voltage drops 0.3 V below the value

specified with IOUT = 10 mA. The input voltage is set to

VOUT +1 V, and the current is pulsed to minimize

temperature effect.

CONTINUOUS OUTPUT CURRENT (IOUT)

Normal operating output current. This is limited by the

package power dissipation.

PULSE OUTPUT CURRENT (IOUT (PULSE))

Max pulse width 5 ms, 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 VIN = VOUT(TYP) + 1 V to VIN = VOUT(TYP) + 6 V.

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 VIN = VOUT(TYP) +1 V. The load

regulation is specified under two output current step

conditions 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 (IOUT = 0 mA).

GROUND CURRENT

Ground current is the current which flows through the

ground pin(s). It is defined as IIN - IOUT, excluding control

current.

RIPPLE REJECTION RATIO (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 200 mVrms, 1 kHz superimposed on the

input voltage, where VIN = VOUT + 2 V. The output decoupling

capacitor is set to 4.7 µF, the noise bypass capacitor is set

to 0.01 µF, 0.1 µF, 1.0 µF and the load current is set to

10 mA. Ripple rejection is the ratio of the ripple content of

the output vs. the input and is expressed in dB.

Example: 64 dB at CN = 0.01 µF, 70 dB at

CN = 0.1 µF, 74 dB at CN = 1.0 µF.

STANDBY CURRENT (ISTBY)

Standby current is the current which flows into the regulator

when the output is turned off by the control function

(VCONT = 0 V). It is measured with VIN = 6 V.

SENSOR CIRCUITS

Overcurrent 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 (Tj = 150

°C). This temperature rise can be caused by extreme heat,

excessive power dissipation caused by large output voltage

drops, or excessive output current. The regulator will shut

off when the temperature exceeds the safe value. As the

junction temperature decreases, 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.

March 1999 TOKO, Inc.

Page 9

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