PTB48560A_15 Datasheet, PDF (19/29 Pages) Texas Instruments – 30-W, 48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK™ SEQUENCING

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PTB48560A, PTB48560B
PTB48560C
SLTS236A – MARCH 2005 – REVISED OCTOBER 2005
V_OBus (1 V/div)
V_OSeq (1 V/div)
V_(POL)1 (1 V/div)
V_(POL)2 (1 V/div)
t_d = 20 ms
t − 20 ms/div
Figure 20. Power-Up Waveforms with POL Modules
Power-Up Sequencing Without A V_OSEQ Output (PTB48560A/C)
Although the PTB48560A or PTB48560C do not have a V_OSeq output, they can provide the input power and
coordinate the power-up sequencing to two or more nonisolated, Auto-Track compliant power modules. Figure 21
shows the PTB48560A (5 V) converter (U1) configured to provide both the input source and the power-up
sequence timing to two 5-V input nonisolated modules. The example shows two PTH05050W modules (U2 and
U3), each rated for up to 6 A of output current. In this case, the number of downstream modules, and their
respective output voltage and load current rating, is only limited by the amount of current available at the V_OBus
output.
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