DPA423SN Power Integrations, DPA423SN Datasheet - Page 17

• Manufacturer Part Number: DPA423SN
• Description: IC CONV DC-DC DPA SWITCH SPAK
• Manufacturer: Power Integrations
• Series: DPA-Switch®r

Specifications of DPA423SN

• Applications: Converter, Power Over Ethernet and Telecom Applications
• Voltage - Input: 16 ~ 75 V
• Number Of Outputs: 1
• Voltage - Output: 220V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SPak (5 leads + Tab)
• Mounting Style: SMD/SMT
• For Use With: 596-1195 - KIT REF DES DPA 6.6W DC-DC CONV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Forward power tables: Tables 1 (upper half), 3 and 4
•
•
Flyback power tables: Tables 1 (lower half), 5 and 6
•
•
The power tables provide two types of information. The fi rst is
the expected device dissipation for a given output power. The
second is the maximum power output. Each table specifi es the
input voltage range and assumes a single 5 V output using
Schottky diode rectifi cation.
For example, referring to Table 1, for 36 VDC to 75 VDC input
range, DPA424 would typically dissipate 1 W in a 23 W forward
converter and has a maximum power capacity of 35 W. In the
same converter, DPA425 would dissipate 0.5 W. Selecting
DPA425 with associated reduced dissipation would increase
overall converter effi ciency by approximately 2%.
Issues Affecting Dissipation:
1.
2.
3.
DPA-Switch Selection
Use Tables 1 and 3 through 6 to select the DPA-Switch based
on device dissipation. Selecting the optimum DPA-Switch
depends upon required maximum output power, effi ciency,
heat sinking constraints and cost goals. With the option to
externally reduce current limit, a larger DPA-Switch may be
used for lower power applications where higher effi ciency is
needed or minimal heat sinking is available. Generally, selecting
the next larger device, than is required for power delivery will
give the highest effi ciency. Selecting even larger devices may
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Output power fi gures are based on forward topology using
Schottky diode rectifi cation. Up to 5% higher output power is
possible using synchronous rectifi cation.
Dissipation data assumes a diode loss representing 6% of the
total output power and combined loss in magnetic compo-
nents representing 6% of the total output power.
DPA-Switch losses are based on a ratio between conduction
and switching losses of approximately 3:1. These assump-
tions are typical for a single 5 V output forward converter
design using Schottky rectifi cation and adequately designed
magnetic components.
Output power and dissipation fi gures are based on a 5 V
output using Schottky diode rectifi cation with an effi ciency of
85%. Values are generated by calculation based on
I
correlated to bench measurement of each DPA-Switch device.
Device dissipations above 1.5 W are possible using the
R package. However the forward converter topology is
recommended for such higher power designs.
2
Using synchronous rectifi cation will tend to reduce device
dissipation.
Designs with lower output voltages and higher currents will
tend to increase the device dissipation listed in the power
table.
Reduced input voltage decreases the available output power
for the same device dissipation. Tables 3 to 6 are the power
tables for 16 VDC and 24 VDC input voltages. Input voltages
below 16 V are possible, but since the internal start-up
current source is not specifi ed at voltages below 16 V, an
external chip supply current should be fed into the
CONTROL pin approximately equal to but less than I
×
R
DS(ON)
losses and characterization of switching losses,
CD1
.
Output Power Table
Output Power Table
Output Power Table
Output Power Table
Table 3.
Notes:
1. Limited by device internal current limit.
2. See text in this section for a complete description of assumptions.
3. See Part Ordering Information.
Table 4.
Table 5.
Total Device
Total Device
Total Device
DPA422
DPA423
DPA424
DPA425
Total Device
DPA422
DPA423
DPA424
Table 6.
Notes:
1. Maximum output power is limited by device internal current limit.
2. See text in this section for a complete description of assumptions.
3. See Part Ordering Information.
4. Higher switching losses may prevent DPA425 from delivering more power than a
DPA422
DPA423
DPA424
DPA425
DPA426
DPA422
DPA423
DPA424
DPA425
DPA426
Dissipation
Dissipation
Dissipation
Dissipation
Product
Product
Product
Product
smaller device.
Output Power Table for 16-32 VDC Input Voltage.
Flyback Output Power Table for 24-48 VDC Input Voltage.
Output Power Table for 24-48 VDC Input Voltage
(See Table 3 for Notes).
Flyback Output Power Table for 16-32 VDC Input Voltage
(See Table 3 for Notes).
3,4
3
3
3
3.5 W
5.5 W
0.5 W
0.5 W
10 W
12 W
11 W
16 W
18 W
6.5 W
8.5 W
0.5 W
0.5 W
5 W
7 W
8 W
3 W
5 W
7 W
3 W
7 W
16-32 VDC Input Range (Flyback)
24-48 VDC Input Range (Flyback)
16-32 VDC Range (Forward)
24-48 VDC Range (Forward)
16.5 W
4.5 W
10 W
14 W
11 W
16 W
22 W
25 W
7 W
7 W
1 W
1 W
11.5 W
0.75 W
0.75 W
8.5 W
10 W
-
-
-
-
23.5 W
2.5 W
2.5 W
15 W
22 W
25 W
35 W
39 W
-
-
-
-
DPA422-426
10 W
12 W
14 W
1 W
1 W
-
-
-
-
27 W
31 W
43 W
48 W
4 W
4 W
-
-
-
-
-
-
1.5 W
1.5 W
15 W
2
2
-
-
-
-
-
-
2
2
37 W
58 W
6 W
6 W
-
-
-
-
-
-
-
-
Output
Output
Power
Power
Rev. S 12/07
4.5 W
8.5 W
11 W
22 W
17 W
Max
Max
6 W
7 W
Output
Output
15.5 W
11.5 W
Power
Power
5.0 W
7.5 W
31 W
43 W
25 W
47 W
65 W
17
Max
Max
8 W
1
1
1
1