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AN4501 Datasheet(PDF) 8 Page - STMicroelectronics |
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AN4501 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 48 page Guideline for the selection of external components AN4501 8/48 DocID026394 Rev 1 Figure 2. Application schematics Step 1: Calculation of the duty cycle The minimum duty cycle is compatible with the device specification (datasheet parameter: TON_MIN, 14% maximum specification see Appendix C: Document management) of the converter is respected. VOUT,OVTH 42 V Output over-voltage threshold rMAX 0.5 Max. ratio at VIN,MIN between inductor current ripple (IL,PP@VINMIN,TARGET) and inductor average current (IL) FSW 450 kHz Switching frequency IOUT,PP,MAX,TARGET 75 mA Target maximum output current ripple RDLED 0.4 Ω Dynamic resistance of one LEDs NbLED 8 Number of LEDs in series VIN,PP,MAX,TARGET 100 mV Target maximum peak-to-peak input voltage ripple RTHAMB,M1 25 K/W Thermal resistance of the switching resistor M1 TAMB,MAX 85 °C Max. ambient temperature RDSON,25 16 m Ω M1 RDSON at 25°C h 90 % Estimated converter’s efficiency Table 1. Example of application conditions and requirements (continued) Parameter Value Comments D MI N 1 V IN MAX η × V OU T ------------------------------- – 1 18 0.9 × 26 --------------------- – 37.7% == = |
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