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TOP245YN- Datasheet(PDF) 28 Page - Power Integrations, Inc. |
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TOP245YN- Datasheet(HTML) 28 Page - Power Integrations, Inc. |
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28 / 52 page  TOP242-250 M 12/04 28 Function TOPSwitch-FX TOPSwitch-GX TOPSwitch-GX Advantages Light Load Operation Cycle skipping Frequency and duty cycle reduction • Improves light load efficiency • Reduces no-load consumption Line Sensing/Exter- nally Set Current Limit (Y, R and F Packages) Line sensing and externally set current limit mutually exclusive (M pin) Line sensing and externally set current limit possible simul- taneously (functions split onto L and X pins • Additional design flexibility allows all features to be used simultaneously Current Limit Programming Range 100% to 40% 100% to 30% • Minimizes transformer core size in highly continuous designs P/G Package Current Limits Identical to Y package TOP243-246 P and G packages internal current limits reduced • Matches device current limit to package dissipation capability • Allows more continuous design to lower device dissipation (lower RMS currents) Y/R/F Package Current Limits 100% (R and F package N/A*) 90% (for equivalent R DS(ON)) • Minimizes transformer core size • Optomizes efficiency for most applications Thermal Shutdown 125 °C min. 70 °C hysteresis 130 °C min. 75 °C hysteresis • Allows higher output powers in high ambient temperature applications Maximum Duty Cycle Reduction Threshold 90 µA 60 µA • Reduces output line frequency ripple at low line • DC MAX reduction optimized for forward design Line Under-Voltage Negative (turn-off) Threshold N/A* 40% of positive (turn-on) threshold • Provides a well defined turn-off threshold as the line voltage falls Soft-Start 10 ms (duty cycle) 10 ms (duty cycle + current limit) • Gradually increasing current limit in addition to duty cycle during soft-start further reduces peak current and voltage • Further reduces component stresses during start up TOPSwitch-FX vs. TOPSwitch-GX Table 5 compares the features and performance differences between TOPSwitch-GX and TOPSwitch-FX. Many of the new features eliminate the need for additional discrete components. Other features increase the robustness of design, allowing cost savings in the transformer and other power components. TOPSwitch-GX Design Considerations Power Table Data sheet power table (Table 1) represents the maximum practical continuous output power based on the following conditions: TOP242 to TOP246: 12 V output, Schottky output diode, 150 V reflected voltage (V OR) and efficiency estimates from curves contained in application note AN-29. TOP247 to TOP250: Higher output voltages, with a maximum output current of 6 A. For all devices, a 100 VDC minimum for 85-265 VAC and 250 VDC minimum for 230 VAC are assumed and sufficient heat sinking to keep device temperature ≤100 °C. Power levels shown in the power table for the R package device assume 6.45 cm2 of 610 g/m2 copper heat sink area in an enclosed adapter, or 19.4 cm2 in an open frame. TOPSwitch-GX Selection Selecting the optimum TOPSwitch-GX depends upon required maximum output power, efficiency, heat sinking constraints and cost goals. With the option to externally reduce current limit, a larger TOPSwitch-GX may be used for lower power applications where higher efficiency is needed or minimal heat sinking is available. Table 5. Comparison Between TOPSwitch-FX and TOPSwitch-GX. *Not available |
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