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參數(shù)資料
| 型號： | TK71654ASCL |
| 廠商： | TOKO Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | LOW DROPOUT VOLTAGE REGULATOR |
| 中文描述： | 低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 111K |
| 代理商： | TK71654ASCL |
December 1999 TOKO, Inc.
Page 13
TK716xx
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
= 5 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.
CONTINUOUS OUTPUT CURRENT (I
OUT
)
Normal operating output current. This is limited by package
power dissipation.
PULSE OUTPUT CURRENT (I
OUT (PULSE)
)
Maximum pulse width 10 ms; duty cycle is 40%: 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
+ 1 V to V
IN
= V
OUT
+ 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
+1 V. The load
regulation is specified under three output current step
conditions of 1 mA to 50 mA, 1 mA to 100 mA and 1 mA to
150 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 (I
GND
)
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 100 mVrms, 400 Hz superimposed on the
input voltage, where V
IN
= V
OUT
+ 1.5 V. The output
decoupling capacitor is set to 10
μ
F, the noise bypass
capacitor is set to 0.1
μ
F, and the load current is set to
30 mA. Ripple rejection is the ratio of the ripple content of
the output vs. the input and is expressed in dB.
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 V
IN
= 8 V.
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
external voltage higher than the input voltage is applied to
the output side.
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