DPA422-426 DPA-Switch Family Highly Integrated DC-DC Converter ICs for Power over Ethernet & Telecom Applications Product Highlights V O Highly Integrated Solution Eliminates up to 50 external componentssaves space, cost SENSE Integrates 220 V high frequency MOSFET, PWM control CIRCUIT Lower cost plastic DIP surface mount (G package) and DPA-Switch through-hole (P package) options for designs 35 W V IN D L Thermally efficient TO-263-7C (R package) option for high CONTROL power applications RESET/ C CLAMP CIRCUIT Superior Performance and Flexibility S X F Eliminates all external current sensing circuitry Built-in auto-restart for output overload/open loop protection Pin selectable 300/400 kHz fixed frequency PI-2770-032002 Wide input (line) voltage range: 16-75 VDC Figure 1. Typical Forward Converter Application. Externally programmable current limit Source connected tab reduces EMI Output Power Table Line undervoltage (UV) detection: meets ETSI standards Line overvoltage (OV) shutdown protection 2 36-75 VDC Input Range (Forward) UV/OV limits gate drive voltage for synchronous rectification Total Device Max Fully integrated soft-start for minimum stress/overshoot 3 Dissipation 0.5 W 1 W 2.5 W 4 W 6 W Power Supports forward or flyback topology 1 4 Output Product Cycle skipping: regulation to zero load without pre-load Hysteretic thermal shutdown for automatic fault recovery 7,8 DPA422 7.5 W 10 W - - - 10 W RoHS compliant P and G package options DPA423 12 W 16 W - - - 18 W DPA424 16 W 23 W 35 W - - 35 W EcoSmart Energy Efficient Extremely low consumption at no-load DPA425 23 W 32 W 50 W 62 W - 70 W Cycle skipping at light load for high standby efficiency 5 DPA426 25 W 35 W 55 W 70 W 83 W 100 W 2 36-75 VDC Input Range (Flyback) Applications PoE applications, VoIP phones, WLAN, security cameras Total Device Max 3 Dissipation Telco central office equipment: xDSL, ISDN, PABX 0.5 W 0.75 W 1 W 1.5 W Power 1 Distributed power architectures (24 V/48 V bus) 4 Output Product Industrial controls 7,8 DPA422 6.5 W 9.0 W - - 9.0 W Description DPA423 9 W 13 W - - 13 W The DPA-Switch IC family is a highly integrated solution for DPA424 10 W 14.5 W 18 W 24 W 26 W DC-DC conversion applications with 16-75 VDC input. 6 6 6 DPA425 - - - 25.5 W 52 W Table 1. Output Power Table. DPA-Switch uses the same proven topology as TOPSwitch, Notes: cost effectively integrating a power MOSFET, PWM control, fault 1. Maximum output power is limited by device internal current limit. protection and other control circuitry onto a single CMOS chip. 2. See Applications Considerations section for complete description of assump- High performance features are enabled with three user 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 configurable pins. Hysteretic thermal shutdown is also provided. dissipation above 1.5 W is possible with R package. In addition, all critical parameters (i.e. current limit, frequency, 4. Packages: P: DIP-8, G: SMD-8, R: TO-263-7C. For lead-free package options, see Part Ordering Information. PWM gain) have tight temperature and absolute tolerance, to 5. Available in R package only. simplify design and reduce system cost. 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. www.power.com June 2015 This Product is Covered by Patents and/or Pending Patent Applications.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 Line Feed-Forward with DC Reduction ................................................................................................................ 6 MAX 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 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 www.power.com