Delta Electronics DEP-008 A Скачать руководство пользователя страница 12 | Manualshive

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Delta Electronics DEP-008 A Скачать руководство пользователя страница 12

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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 initial value of R2 equal to 20K

Ω

at internal circuit and set

resistor R1 for different tracking method. Figure 6 shows the circuit diagram of Ratio-Metric
start-up when Vo

PS2

tracks the Vo

PS1

.

R1

R2

TRACK

Vo

PS1

PS2

Vo

PS2

PS1

Vin

Vin

ENABLE

ENABLE

To Tracking

circuit

20K

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

PS1

PS2

PS1

PS2

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Содержание DEP-008 A

Страница 1: ...a myriad of standard protection features This document guides the user through the evaluation procedures to qualify a POL module The data shown in this Evaluation Procedure is for the SIP Package Type...

Страница 2: ...3 3 Digital multi meters one with 20A range and ideally all with 4 1 2 digit resolution DVM1 DVM2 and DVM3 Zentech 2041 or equivalent 3 4 An electronic load Chroma 63030 or equivalent 300W approximate...

Страница 3: ...BNC cable length less than 20 inches 500mm from BNC1 of the Evaluation Board to Channel 1 of the oscilloscope See Item 3 2 This cable is used to measure the input voltage between SVIN and SGND 4 6 Con...

Страница 4: ...r of the power module to determine that the correct module is being evaluated Note DNS04S0A0S06P A would denote the SMT package while DNS04S0A0R06P A would denote the SIP package This Evaluation Board...

Страница 5: ...he converter requires a margin trim up set the SW3_4 to ON position Please refer to the SW3 Function table SW3 Function table Subdivide switch No Function SW3_1 Voltage trim up SW3_2 Voltage trim down...

Страница 6: ...4 Test the input under voltage function while observing DVM2 DVM3 and channel 1 of the oscilloscope Increase the input voltage until the output of the converter reaches the appropriate value This wil...

Страница 7: ...voltage and temperature remain constant Test 1 Turn on the fan 2 Set the input voltage to the desired operating level while monitoring DVM2 3 Set the switch SW2 to the converter ON 4 Adjust the output...

Страница 8: ...program the output voltage of the DNS04 module to 1 8Vdc below is the calculation of Rtrim 15004 5110 7525 0 8 1 21070 set R The table 1 provides the Rset value required for some standard output and t...

Страница 9: ...nge of the operating load range please refer to the data sheet for the detailed specification 2 Output Voltage Set Point Adjustment by external voltage source For DNS series trim to Vo set using an ex...

Страница 10: ...im up and Rmargin down is for trim down Please refer to the data sheet and Evaluation Board Schematic for the detailed information A software tool for voltage margining calculation is available to ask...

Страница 11: ...al start up is implemented by connecting the power good signal PWRGD pin of PS1 to the TRACK pin of PS2 with a resistor capacitor RC circuit The waveforms of power up and down are in Figures 4 and 5 I...

Страница 12: ...termine the tracking method that is implemented To simplify the tracking design set initial value of R2 equal to 20K at internal circuit and set resistor R1 for different tracking method Figure 6 show...

Страница 13: ...he PS2 Voset PS2 3 3V R1 is calculated as follows K K R 75 55 20 32 1 32 1 7 1 3 3 1 Figure 7 Ratio metric tracking Power up Figure 8 Ratio metric tracking Power down For Ratio Metric applications tha...

Страница 14: ...The objective is to minimize the voltage difference between the power supply outputs during power up and down The waveforms of power up and down are showed in Figures 13 and 14 For type A DNXXX0A0XXX...

Страница 15: ...tart up when VoPS2 tracks the VoPS1 only for type C R1 R2 TRACK VoPS1 PS2 VoPS2 PS1 Vin Vin ENABLE ENABLE To Tracking circuit 20K 30 1K Figure 12 PS1 and PS2 track output voltage Simultaneous start up...

Страница 16: ...absolute maximum voltage cannot over the Vin 5 For type A When Tracking is unused put R1 equal to 1K and connect TRACK pin to Vcc For type C When Tracking is unused put R1 equal to 30 1K and connect...

Страница 17: ...ltage 2 Turn on module by using the Enable on off Test Turn on the module by using the external switch 1 Turn on the fan 2 Turn on the input power supply and set it to the desired operating point 3 Se...

Страница 18: ...the ratio of total output power to the input power It is typically measured at full load and nominal input voltage Test 1 Turn on the fan 2 Set the enable switch SW2 to the converter ON 3 Adjust the i...

Страница 19: ...Appendix A Evaluation Board Schematic 19...

Страница 20: ...x 886 3 4513485 Email DCDC delta com tw Warranty Delta offers a two 2 year limited warranty Complete warranty information is listed on our web site or is available upon request from Delta Information...

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