DPA422-426
DPA-Switch
Family
®
Highly Integrated DC-DC Converter ICs for
Power over Ethernet & Telecom Applications
Product Highlights
Highly Integrated Solution
•
Eliminates up to 50 external components–saves space, cost
•
Integrates 220 V high frequency MOSFET, PWM control
•
Lower cost plastic DIP surface mount (G package) and
through-hole (P package) options for designs ≤35 W
•
Thermally efficient TO-263-7C (R package) option for high
power applications
Superior Performance and Flexibility
•
Eliminates all external current sensing circuitry
•
Built-in auto-restart for output overload/open loop protection
•
Pin selectable 300/400 kHz fixed frequency
•
Wide input (line) voltage range: 16-75 VDC
•
Externally programmable current limit
•
Source connected tab reduces EMI
•
Line under-voltage (UV) detection: meets ETSI standards
•
Line overvoltage (OV) shutdown protection
•
UV/OV limits gate drive voltage for synchronous rectification
•
Fully integrated soft-start for minimum stress/overshoot
•
Supports forward or flyback topology
•
Cycle skipping: regulation to zero load without pre-load
•
Hysteretic thermal shutdown for automatic fault recovery
•
RoHS compliant P and G package options
EcoSmart
– Energy Efficient
•
Extremely low consumption at no load
•
Cycle skipping at light load for high standby efficiency
Applications
•
PoE applications, VoIP phones, WLAN, security cameras
•
Telco central office equipment: xDSL, ISDN, PABX
•
Distributed power architectures (24 V/48 V bus)
•
Industrial controls
®
VO
SENSE
CIRCUIT
DPA-Switch
VIN
RESET/
CLAMP
CIRCUIT
D
L
CONTROL
C
S
X
F
PI-2770-032002
Figure 1.
Typical Forward Converter Application.
Output Power Table
36-75 VDC Input Range (Forward)
2
Total Device
Dissipation
3
Product
DPA422
7
DPA423
DPA424
DPA425
DPA426
5
4
0.5 W
7.5 W
12 W
16 W
23 W
25 W
1W
10 W
16 W
23 W
32 W
35 W
2.5 W
-
-
35 W
50 W
55 W
4W
-
-
-
62 W
70 W
2
6W
-
-
-
-
83 W
Max
Power
Output
1
10 W
18 W
35 W
70 W
100 W
36-75 VDC Input Range (Flyback)
Total Device
Dissipation
3
Product
4
DPA422
DPA423
DPA424
DPA425
6.5 W
9W
10 W
-
6
0.5 W
0.75 W
9.0 W
13 W
14.5 W
-
6
1W
-
-
18 W
-
6
1.5 W
-
-
24 W
25.5 W
Max
Power
Output
1
9.0 W
13 W
26 W
52 W
Description
The DPA-Switch IC family is a highly integrated solution for
DC-DC conversion applications with 16-75 VDC input.
DPA-Switch uses the same proven topology as TOPSwitch
®
,
cost effectively integrating a power MOSFET, PWM control, fault
protection and other control circuitry onto a single CMOS chip.
High performance features are enabled with three user
configurable pins. Hysteretic thermal shutdown is also provided.
In addition, all critical parameters (i.e. current limit, frequency,
PWM gain) have tight temperature and absolute tolerance, to
simplify design and reduce system cost.
Table 1. Output Power Table.
Notes:
1.
Maximum output power is limited by device internal current limit.
2.
See Applications Considerations section for complete description of assumptions
and for output powers with other input voltage ranges.
3.
For device dissipation of 1.5 W or below, use P or G packages. Device
dissipation
above 1.5 W is possible with R package.
4.
Packages: P: DIP-8, G: SMD-8, R: TO-263-7C. For lead-free package options,
see Part Ordering Information.
5.
Available in R package only.
6.
Due to higher switching losses, the DPA425 may not deliver additional power
compared to a smaller device.
7.
Available in P and G package only.
www.powerint.com
December 2007
POWERINT [ POWER INTEGRATIONS, INC. ]
