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參數(shù)資料
| 型號： | TK11149M |
| 廠商： | TOKO Inc. |
| 英文描述： | VOLTAGE REGULATOR WITH ON/OFF SWITCH |
| 中文描述： | 調(diào)壓器ON / OFF開關 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 85K |
| 代理商： | TK11149M |
March 1999 TOKO, Inc.
Page 9
TK111xxM
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (V
OUT
)
The output voltage is specified with V
IN
= (V
OUT(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
= V
OUT(TYP)
+ 1 V to V
IN
= V
OUT(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
= V
OUT(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
- I
OUT
, 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
= V
OUT
+ 2 V. The output decoupling
capacitor is set to 4.7
μ
F, the noise bypass capacitor is set
to 0.01
μ
F, 0.1
μ
F, 1.0
μ
F 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
μ
F, 70 dB at
C
N
= 0.1
μ
F, 74 dB at C
N
= 1.0
μ
F
SENSOR CIRCUITS
Overcurrent Sensor
The overcurrent sensor protects the device if the output is
shorted to ground.
Thermal Senso
r
The thermal sensor protects the device if the junction
temperature exceeds the safe value (T
j
= 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.
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
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