This document provides in-depth guidance on using the Fairchild Design Tool for FL7732 in a boost buck topology. It includes steps for input/output specification, transformer design, control circuit design, and power device design. The document also provides specifications for input voltage, output voltage, output current, and maximum output voltage.
This document serves as a design guide for utilizing the Fairchild Design Tool specifically for the FL7732 chip in a Buck-Boost topology. It is intended to be used in conjunction with the product datasheet to ensure accurate circuit design. The guide covers the entire design flow from initial specifications to final component selection. This manual is written in Chinese.
| Min. Vin | 198 Vac |
|---|---|
| Max. Vin | 264 Vac |
| Vout | 100 V |
| Max. Vout | 120 V |
| Iout | 125 mA |
| Pout | 12.500 W |
| Max. Duty | 26 % |
| Switching freq. | 55 kHz |
| Efficiency | 85 % |
| Ae | 36.6 mm2 |
| Bmax | 0.25 |
| Lm | 1.638 mH |
| Np.min | 144.667 |
| T Np | 145 T |
| Na | 27.792 T |
| Nap | 0.192 |
| Vcs.max | 0.616 V |
| Ts | 18.182 us |
| Ton+Tdis | 17.964 us |
| Rsense | 0.762 ohm |
| Vin.bnk | 50 V |
| Rvs1 | 137.631 kohm |
| Rvs2 | 15.839 kohm |
| Cvs | 10 pF |
| Ccomi | 1 uF |
| Cvdd | 33 uF |
| Dvdd Vmax | 95.059 V |
| Rstr | 342.857 kohm |
| Rdummy | 400.000 kohm |
| SW/Dout Vmax | 493.352 V |
| SW/DoutIpk | 0.808 A |
| Inductor Irms | 0.282 A |
This document is intended to provide in-depth guidance to using the Fairchild Design Tool for FL7732 in a boost buck topology.
The Design Tool should be used with the product datasheet.
Max. duty is generally between 20 % and 50 %.
The switching frequency should be less than 65 kHz.