Datasheet

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SLUS274A – JANUARY 1999 – REVISED APRIL 2003
10
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APPLICATION INFORMATION
UDG–9900
2
V
DD
R
VDD
50 Ω
1
2
LINEAR
CURRENT
AMPLIFIER
PL
7
OUT
+
–
+
–
IMAX
+
8
+
–
6
SENSE
5
VSS
4
CT
ON–TIME
CONTROL
3
VDD
UVLO
5.0 V
REF
LOGIC
SUPPLY
+
+
–
SOURCE
ONLY
SD/FLT
R2
VSS
R1
OUTPUT
VSS
FAULT=
50 mV
DISABLE
9.5 SHUNT
REGULATOR
1 = UNDERVOLTAGE
V
DD
R
T
R
S
C
T
V
DD
C
SS
C
VDD
20 µA
Figure 3. Typical Application Diagram
To calculate the startup time using the current source load.
t
START
+
C
OUT
|VSS|
I
MAX
* I
LOAD
To calculate the startup time using the resistive load.
t
START
+ C
OUT
R
OUT
ln
ǒ
I
MAX
R
OUT
I
MAX
R
OUT
* |VSS|
Ǔ
(14)
(15)