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參數(shù)資料
| 型號： | UCC3913J |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 158K |
| 代理商： | UCC3913J |
7
UCC1913
UCC2913
UCC3913
1
2
LINEAR
CURRENT
AMPLIFIER
PL
7
OUT
IMAX
+
V
DD
50
8
V
DD
6
SENSE
5
VSS
4
CT
ON-TIME
CONTROL
3
VDD
UVLO
5.0V
REF
LOGIC
SUPPLY
9.5V SHUNT REGULATOR
+
20
μ
A
1=
UNDERVOLTAGE
SOURCE
ONLY
SD/FLT
V
DD
CSS
R2
VSS
C
VDD
R1
R
VDD
R
T
OUTPUT
R
S
C
T
VSS
FAULT=
50mV
DISABLE
Figure 6. Typical application diagram.
Next, the variable I
MAX
must be calculated. I
MAX
is the
maximum current that the UCC1913 will allow through
the transistor, M1, and it can be shown that during
startup with an output capacitor the power MOSFET, M1,
can be modeled as a constant current source of value
I
MAX
where:
V
R
SENSE
I
MAX
IMAX
=
where V
IMAX
= voltage on pin IMAX.
Given this information, calculation of the startup time is
now possible via the following:
Current Source Load:
T
C
I
MAX
VSS
I
LOAD
START
OUT
=
Resistive Load:
T
C
R
n
I
R
I
R
VSS
START
OUT
OUT
MAX
OUT
MAX
OUT
=
Once T
START
is calculated, the power limit feature of the
UCC1913 must be addressed and component values de-
rived. Assuming the user chooses to limit the maximum
allowable average power that will be associated with the
circuit breaker, the power limiting resistor, R
PL
, can be
easily determined by the following:
APPLICATION INFORMATION (cont.)
UDG-99002
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