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DNS04S0A0S06PFD Datasheet(PDF) 10 Page - Delta Electronics, Inc. |
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DNS04S0A0S06PFD Datasheet(HTML) 10 Page - Delta Electronics, Inc. |
10 / 15 page DS_DNS10SMD06_03092009 10 Sequential Start-up Sequential start-up (Figure 26) is implemented by placing an On/Off control circuit between VoPS1 and the On/Off pin of PS2. R1 R2 VoPS1 PS1 Vin On/Off On/Off PS2 VoPS2 Vin C1 Q1 R3 Simultaneous Simultaneous tracking (Figure 27) is implemented by using the TRACK pin. The objective is to minimize the voltage difference between the power supply outputs during power up and down. The simultaneous tracking can be accomplished by connecting VoPS1 to the TRACK pin of PS2. Please note the voltage apply to TRACK pin needs to always higher than the VoPS2 set point voltage. TRACK VoPS1 PS2 VoPS2 PS1 Vin Vin On/Off On/Off Ratio-Metric Ratio–metric (Figure 28) is implemented by placing the voltage divider on the TRACK pin that comprise R1 and R2, to create a proportional voltage with VoPS1 to the Track pin of PS2. For Ratio-Metric applications that need the outputs of PS1 and PS2 reach the regulation set point at the same time. The following equation can be used to calculate the value of R1 and R2. The suggested value of R2 is 10kΩ. 2 1 2 1 , 2 , R R R V V PS O PS O + = R1 R2 TRACK VoPS1 PS2 VoPS2 PS1 Vin Vin On/Off On/Off The high for positive logic The low for negative logic FEATURE DESCRIPTIONS (CON.) The output voltage tracking feature (Figure 26 to Figure 28) is achieved according to the different external connections. If the tracking feature is not used, the TRACK pin of the module can be left unconnected or tied to Vin. For proper voltage tracking, input voltage of the tracking power module must be applied in advance, and the remote on/off pin has to be in turn-on status. (Negative logic: Tied to GND or unconnected. Positive logic: Tied to Vin or unconnected) Figure 26: Sequential Figure 27: Simultaneous Figure 28: Ratio-metric PS1 PS1 PS1 PS1 PS2 PS2 PS2 PS2 PS1 PS2 PS1 PS2 +△V |
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