Converter ICs. DPA426 Datasheet

DPA426 Datasheet PDF


Part Number

DPA426

Description

Highly Integrated DC-DC Converter ICs

Manufacture

Power Integrations

Total Page 30 Pages
Datasheet
Download DPA426 Datasheet



DPA426
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 undervoltage (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
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.
DPA-Switch
VIN D
RESET/
CLAMP
CIRCUIT
S
L
CONTROL C
XF
VO
SENSE
CIRCUIT
Figure 1. Typical Forward Converter Application.
PI-2770-032002
Output Power Table
36-75 VDC Input Range (Forward)2
Total Device
Dissipation3 0.5 W 1 W 2.5 W 4 W
Product4
Max
6 W Power
Output1
DPA4227,8
DPA423
DPA424
DPA425
DPA4265
7.5 W 10 W
-
-
12 W 16 W
-
-
16 W 23 W 35 W
-
23 W 32 W 50 W 62 W
25 W 35 W 55 W 70 W
36-75 VDC Input Range (Flyback)2
-
-
-
-
83 W
10 W
18 W
35 W
70 W
100 W
Total Device
Dissipation3
Product4
0.5 W
0.75 W
1W
1.5 W
Max
Power
Output1
DPA4227,8
DPA423
DPA424
DPA425
6.5 W
9W
10 W
-6
9.0 W
13 W
14.5 W
-6
-
-
18 W
-6
-
-
24 W
25.5 W
9.0 W
13 W
26 W
52 W
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 assump-
tions, 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.
8. DPA422 not recommended for new designs, use DPA423 instead.
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This Product is Covered by Patents and/or Pending Patent Applications.
June 2015

DPA426
DPA422-426
Section List
Functional Block Diagram ........................................................................................................................................ 3
Pin Functional Description ....................................................................................................................................... 3
DPA-Switch Family Functional Description ............................................................................................................. 4
CONTROL (C) Pin Operation..................................................................................................................................... 4
Oscillator and Switching Frequency........................................................................................................................... 5
Pulse Width Modulator & Maximum Duty Cycle......................................................................................................... 5
Minimum Duty Cycle and Cycle Skipping.................................................................................................................. 6
Error Amplifier........................................................................................................................................................... 6
On-chip Current Limit with External Programmability................................................................................................. 6
Line Undervoltage Detection (UV).............................................................................................................................. 6
Line Overvoltage Shutdown (OV)............................................................................................................................... 6
LRienme oFteeedO-NFo/OrwFFar..d...w...it..h..D...C..M..A..X..R..e..d..u..c..t.i.o..n...................................................................................................................................................................................................................................
6
7
Synchronization......................................................................................................................................................... 7
Soft-Start.................................................................................................................................................................. 8
Shutdown/Auto-Restart............................................................................................................................................ 8
Hysteretic Over-Temperature Protection.................................................................................................................... 8
Bandgap Reference.................................................................................................................................................. 8
High-Voltage Bias Current Source............................................................................................................................. 8
Using Feature Pins ...................................................................................................................................................... 8
FREQUENCY (F) Pin Operation................................................................................................................................. 8
LINE-SENSE (L) Pin Operation.................................................................................................................................. 9
EXTERNAL CURRENT LIMIT (X) Pin Operation.......................................................................................................... 9
Typical Uses of FREQUENCY (F) Pin ....................................................................................................................... 11
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins ........................................................ 11
Application Examples ............................................................................................................................................... 14
Key Application Considerations ............................................................................................................................... 16
DPA-Switch Design Considerations......................................................................................................................... 16
DPA-Switch Layout Considerations......................................................................................................................... 18
Quick Design Checklist........................................................................................................................................... 19
Design Tools........................................................................................................................................................... 19
Product Specifications and Test Conditions ......................................................................................................... 20
Typical Performance Characteristics ................................................................................................................... 27
Package Outlines ..................................................................................................................................................... 31
Part Ordering Information ....................................................................................................................................... 32
2
Rev. U 06/15
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