Datasheet
SLUS384B – NOVEMBER 1999 – REVISED JUNE 2000
6
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APPLICATION INFORMATION
estimating maximum load capacitance
For worst-case constant-current load of value just less than the trip limit; C
OUT(max)
can be estimated from:
C
OUT(max)
+
ǒ
I
MAX
* I
LOAD
Ǔ
ǒ
22 10
3
C
T
V
OUT
Ǔ
Where V
OUT
is the output voltage and I
MAX
is the maximum sourcing current.
For a resistive load of value R
LOAD
, the value of C
OUT(max)
can be estimated from:
C
OUT(max)
+
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȡ
Ȣ
22 10
3
C
T
R
LOAD
ȏn
ȧ
ȡ
Ȣ
1
1*
VOUT
I
MAX
R
LOAD
ȧ
ȣ
Ȥ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȧ
ȣ
Ȥ
UDG–97071
Figure 2. Load Curent, Timing Capacitor Voltage and Output Voltage of the UCC3918 Under Fault
(6)
(7)