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UC1832J883B Fiches technique(PDF) 5 Page - Texas Instruments

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No de pièce UC1832J883B
Description  Precision Low Dropout Linear Controllers
Download  18 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC1832J883B Fiches technique(HTML) 5 Page - Texas Instruments

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UC1832
UC2832/3
UC3832/3
APPLICATION AND OPERATION INFORMATION (cont.)
UDG-92042-1
UDG-92043-1
PNP Pass (Low Drop-Out Regulator) (UCx833)
NPN Pass (Medium Power, Low Drop-Out Regulator) (UCx832)
For any power supply, the rate at which the total output
capacitance can be charged depends on the maximum
output current available and on the nature of the load. For
a constant-current current-limited power supply, the out-
put will come up if the load asks for less than the maxi-
mum available short-circuit limit current.
To guarantee recovery of a duty-ratio current-limited
power supply from a short-circuited load condition, there
is a maximum total output capacitance which can be
charged for a given unit ON time. The design value of ON
time can be adjusted by changing the timing capacitor.
Nominally, TON = 0.693 x 10k x CT.
Typically, the IC regulates output current to a maximum of
IMAX = K x ITH, where ITH is the timer trip-point current,
and
K
=
Current Sense Amplifier Offset Voltage
100
mA
≈1.35 for UCx833, and is variable from 1.35 to 3.05
with VADJ for the UCx832.
For a worst-case constant-current load of value just less
than ITH, CMAX can be estimated from:
CMAX
= ((K−1)ITH) (
TON
VOUT
),
where VOUT is the nominal regulator output voltage.
For a resistive load of value RL, the value of CMAX can be
estimated from:
CMAX
=
TON
RL
1
In [
(1−
VOUT
K
• ITH • RL)
−1
]
.
Estimating Maximum Load Capacitance
5


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