PTB48560A Datasheet, PDF (15/28 Pages) Texas Instruments – 30-W, 48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK TM SEQUENCING

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PTB48560A, PTB48560B
PTB48560C
SLTS236A – MARCH 2005 – REVISED OCTOBER 2005
+V_I
1 = Outputs On
Q1
BSS138
-V_I
1
+V_I
DC/DC
Module
2
PEN
3
NEN
4 _-VI
Figure 16. Negative Enable Configuration
On/Off Enable Turn-On Time
Once enabled, the converter executes a soft-start power up. The converter exibits a short delay of approximately
7 ms, measured from the transition of the enable signal to the instance the V_O Bus output begins to rise. The
output is in regulation within 20 ms.
V_OBus (5 V/div)
I_I (1 A/div)
Q1 V_DS (5 V/div)
t − 5 ms/div
Figure 17. Output Enable Power-Up Characteristic
15