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SLMA002 Datasheet(PDF) 27 Page - Texas Instruments

Part # SLMA002
Description  2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
PDF  55 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SLMA002 Datasheet(HTML) 27 Page - Texas Instruments

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Cascading Supply Operation
1
2
3
4
14
13
12
11
PVDD2
BOOT2
SW2
BP
PVDD1
BOOT1
SW1
GND
TPS54283
5
6
7
10
9
8
SEQ
ILIM2
FB2
EN1
EN2
FB1
OUTPUT1
OUTPUT2
V
IN
UDG-07015
TPS54283,, TPS54286
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
The preferred sequence of events is:
1. PVDD2 rises above the input UVLO voltage
2. PVDD1 rises with Output 1 disabled until PVDD1 rises above level to support Output 1 regulation.
With these two conditions satisfied, there is no restriction on PVDD2 to be greater than, or less than PVDD1.
DESIGN HINT
An R-C delay on EN1 may be used to delay the startup of Output1 for a long enough
period of time to ensure that PVDD1 can support Output 1 load.
It is possible to source PVDD1 from Output 2 as depicted in Figure 33 and Figure 34. This configuration may be
preferred if the input voltage is high, relative to the voltage on Output 1.
Figure 33. Schematic Showing Cascading PVDD1 from Output 2
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): TPS54283 TPS54286



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