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TK11141S Datasheet(PDF) 9 Page - TOKO, Inc

Part # TK11141S
Description  VOLTAGE REGULATOR WITH ON/OFF SWITCH
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Manufacturer  TOKO [TOKO, Inc]
Direct Link  http://www.toko.com
Logo TOKO - TOKO, Inc

TK11141S Datasheet(HTML) 9 Page - TOKO, Inc

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March 1999 TOKO, Inc.
Page 9
TK111xxS
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (V
OUT)
The output voltage is specified with V
IN = (VOUT(TYP) + 1 V)
and I
OUT = 10 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
temperature.
OUTPUT CURRENT (I
OUT(MAX))
The rated output current is specified under the condition
where the output voltage drops 0.3 V below the value
specified with I
OUT = 10 mA. The input voltage is set to
V
OUT
+1 V, and the current is pulsed to minimize
temperature effect.
CONTINUOUS OUTPUT CURRENT (I
OUT)
Normal operating output current. This is limited by the
package power dissipation.
PULSE OUTPUT CURRENT (I
OUT (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 V
IN = 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 V
IN = 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 (I
Q)
The quiescent current is the current which flows through
the ground terminal under no load conditions (I
OUT = 0 mA).
GROUND CURRENT
Ground current is the current which flows through the
ground pin(s). It is defined as I
IN - 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 V
IN = 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 C
N = 0.01 µF, 70 dB at
C
N = 0.1 µF, 74 dB at CN = 1.0 µF.
STANDBY CURRENT (I
STBY)
Standby current is the current which flows into the regulator
when the output is turned off by the control function
(V
CONT = 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.


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