Delta Electronics DNL Series manual PS1 PS2, Ratio-Metric Implementation

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PS1

PS2

PS1

PS2

Figure 4: Sequential Power up

Figure 5: Sequential Power down

Ratio-Metric Implementation

Ratio–metric is implemented by the selection of the resistor values of the voltage divider on the TRACK pin. Resistors R1 and R2, in Figure 6 determine the tracking method that is implemented.

To simplify the tracking design, set the initial value of R2 equal to 20KΩ at internal circuit and adjust the resistor R1 for different tracking method. Figure 6 shows the circuit diagram of Ratio-Metric start-up when VoPS2 tracks the VoPS1.

Vin

ENABLE

PS1

Vin

VoPS1

R1

TRACK

ENABLE

PS2

To Tracking circuit

R2 20K

VoPS2

Figure 6. PS1 and PS2 track output voltage Ratio-Metric start-up

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Contents Delphi DNM and DNL Series of SMT type POL converters PurposeRelevant Documentation Equipment Required Equipment Set-Up and DescriptionThermal Management of the Converter Tests Performed Test Set-UpInitial Power Up SW3 Function tableTests and Evaluation TestNo Load Input Current Test Output Characteristics Line Regulation Load RegulationOutput Ripple 10500 For DNM04xx and DNL04xx series Vtrim = 0.7 − 0.1698 ⋅ Vout −For DNM12xx and DNL12xx series Voltage MarginingVoltage Tracking Detailed Description Sequential ImplementationPS1 PS2 Ratio-Metric ImplementationVref PS1=5VPS1=5V PS2=3.3V Simultaneous ImplementationVref define Dynamic Characteristics Output Voltage Deviation TestTest Turn on the module by using the external switch Test Turn on the module by using the Enable on/offTurn-On Response Time Thermal Characteristic Efficiency Appendix A- Evaluation Board Schematic Warranty
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