DPA423 Power Integrations, Inc., DPA423 Datasheet - Page 12

• Manufacturer Part Number: DPA423
• Description: Highly Integrated DC-DC Converter Ics For Distributed Power Architecturesthe Dpa-switch ic Family Introduces a Highly Integratedsolution For DC-DC Conversion Applications in The 16-75 Vdcinput Range.dpa-switch Uses The Same Proven Topology as Topswit
• Manufacturer: Power Integrations, Inc.

Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins
Figure 13. Line-Sensing for Under-Voltage Only (Overvoltage
Figure 9. 400 kHz Frequency Operation.
Figure 11. Three Terminal Operation (LINE-SENSE and
Typical Uses of FREQUENCY (F) Pin
12
DPA423-426
Voltage
Voltage
Input
Voltage
Input
DC
L
4/04
DC
Input
+
DC
+
-
Disabled).
-
+
EXTERNAL CURRENT LIMIT Features Disabled.
FREQUENCY Pin can be tied to SOURCE or
CONTROL Pin).
-
6.2 V
D
S
D
S
D
S
CONTROL
CONTROL
CONTROL
L
X
576 kΩ
1%
42.2 kΩ
1%
L
F
F
C
C
C
R
LS
V
For Values Shown
UV
V
UV
C
C L X S F
= R
= 33.3 V
V
PI-2852-091302
LS
L (I
S
PI-2766-070901
PI-2654-071700
L
x I
= I
UV
UV
D
D
)
+
Figure 14. Line-Sensing for Overvoltage Only (Under-Voltage
Figure 12. Line-Sensing for Under-Voltage, Overvoltage and
Figure 10. 300 kHz Frequency Operation.
Voltage
Voltage
Voltage
Input
Input
Input
DC
DC
DC
+
+
+
Disabled). Maximum Duty Cycle will be reduced at
Low Line.
Line Feed Forward.
-
-
-
R
D
S
D
D
S
S
LS
R
CONTROL
CONTROL
CONTROL
LS
L
L
590 kΩ
1%
30 kΩ
1%
619 kΩ
1%
V
V
UV
OV
F
= I
= I
C
C
C
UV
OV
For R
x R
x R
1N4148
V
V
V
For Values Shown
UV
OV
OV
LS
LS
V
OV
LS
+ V
+ V
= 33.3 V
= I
= 86.0 V
= 86.2 V
= 619 k
V
OV
L (I
L (I
L (I
PI-2853-091302
PI-2655-071700
PI-2767-091302
L
x R
L
L
= I
= I
= I
UV
LS
OV
OV
Ω
)
)
)
+