LSN2-T/30-D12-C【PDF 9/16 页】CONV DC/DC 150W 30A 0.8-5V SIP

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LSN2-T/30-D12 Series

DOSA-SIP, 30A POL DC/DC Converters

Figure 6. Coincident or Simultaneous Phasing (Identical Slew Rates)

Figure 8. Staggered or Sequential Phasing—Inclusive (Fixed Delays)

The ?rst system (discrete On/Off controls) applies signals from an already-

powered logic sequencer or dedicated microcontroller which turns on each

downstream power section in cascaded series. This of course assumes all

POLs have On/Off controls. A distinct advantage of the sequencing controller

is that it can produce an “All On” output signal to state that the full system is

stable and ready to go to work. For additional safety, the sequencer can moni-

tor the output voltages of all downstream POLs with an A/D converter system.

Figure 9. Staggered or Sequential Phasing—Exclusive

(Fixed Cascaded Delays)

Figure 7. Proportional or Ratiometric Phasing (Identical V OUT Time)

Figure 7 shows two POLs with different slew rates in order to reach differing

?nal voltages at about the same time.

However, the sequencer controller has some obvious dif?culties besides

extra cost, wiring and programming complexity. First, power is applied as a

fast-rising all-or-nothing step which may be unacceptable to certain circuits,

especially large output bypass capacitors. These could force POLs into overcur-

rent shutdown. And some circuits (such as many linear regulators and some

POLs) may not have convenient start-up controls. This requires designing and

fabricating external power controls such as high-current MOSFETs.

Figure 10. Wiring for Simultaneous Phasing

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