DAK-71A Power Integrations, DAK-71A Datasheet - Page 2

• Manufacturer Part Number: DAK-71A
• Description: KIT DESIGN ACCELERATOR DC-DC
• Manufacturer: Power Integrations
• Series: DPA-Switch®r

Specifications of DAK-71A

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 3.3V
• Current - Output: 2A
• Voltage - Input: 36 ~ 72V
• Regulator Topology: Flyback
• Frequency - Switching: 400kHz
• Board Type: Bare (Unpopulated) and Fully Populated
• Utilized Ic / Part: DPA423, DPA424, DPA425
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 596-1009

Rev. S 12/07
Functional Block Diagram ....................................................................................................................................... 3
Pin Functional Description ...................................................................................................................................... 3
DPA-Switch Family Functional Description ............................................................................................................ 4
Using Feature Pins ..................................................................................................................................................... 8
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
Product Specifi cations and Test Conditions .......................................................................................................... 21
Typical Performance Characteristics .................................................................................................................. 27
Part Ordering Information ....................................................................................................................................... 30
Package Outlines .................................................................................................................................................... 31
2
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 Amplifi er .......................................................................................................................................................... 6
On-chip Current Limit with External Programmability ................................................................................................ 6
Line Under-Voltage Detection (UV) ............................................................................................................................ 6
Line Overvoltage Shutdown (OV) .............................................................................................................................. 6
Line Feed-Forward with DC
Remote ON/OFF ...................................................................................................................................................... 7
Synchronization ........................................................................................................................................................ 7
Soft-Start ................................................................................................................................................................. 8
Shutdown/Auto-Restart ........................................................................................................................................... 8
Hysteretic Over-Temperature Protection ................................................................................................................... 8
Bandgap Reference ................................................................................................................................................. 8
High-Voltage Bias Current Source ............................................................................................................................ 8
FREQUENCY (F) Pin Operation ................................................................................................................................ 8
LINE-SENSE (L) Pin Operation ................................................................................................................................. 9
EXTERNAL CURRENT LIMIT (X) Pin Operation ......................................................................................................... 9
DPA-Switch Design Considerations ........................................................................................................................ 16
DPA-Switch Layout Considerations ........................................................................................................................ 18
Quick Design Checklist .......................................................................................................................................... 19
Design Tools .......................................................................................................................................................... 20
DPA422-426
MAX
Reduction ................................................................................................................ 6
Section List
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