Datasheet

TOP242-250
18
I
4/03
General Information & Table of Contents
Product Selector Guide 1
Data Sheets 2
Application Notes 3
Design Ideas 4
Design Tools 5
Quality and Reliability 6
Package Information 7
DPA-Switch DC-DC Seminar 8
LinkSwitch & TinySwitch-II AC-DC Seminar 9
TOPSwitch-GX AC-DC Seminar 10
Sales Representatives and Distributors 11
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)
Figure 28. Line-Sensing and Externally Set Current Limit.
PI-2640-040501
DC
Input
Voltage
+
-
D
S
C
CONTROL
L
ON/OFF
47 kΩ
Q
R
can be an optocoupler
output or can be replaced by
a manual switch.
300 kΩ
Q
R
Figure 29. Active-on Remote ON/OFF.
X
PI-2629-040501
DC
Input
Voltage
+
-
D
S
C
CONTROL
L
R
IL
R
LS
12 kΩ
2 MΩ
V
UV
= I
UV
x R
LS
V
OV
= I
OV
x R
LS
For R LS = 2 MΩ
DC
MAX
@100 VDC = 78%
DC
MAX
@375 VDC = 38%
For R
IL
= 12 kΩ
I
LIMIT
= 69%
See fig. 55 for other
resistor values (R
IL
)
to select different I
LIMIT
values
V
UV
= 100 VDC
V
OV
= 450 VDC