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A5975AD Fiches technique(PDF) 39 Page - STMicroelectronics

No de pièce A5975AD
Description  Voltage feed-forward
PDF  50 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A5975AD Fiches technique(HTML) 39 Page - STMicroelectronics

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A5975AD
Application information
Doc ID 018761 Rev 1
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Equation 40
Equation 41
An important point to take into account is that the ground pin of the device is connected to
the negative output voltage. Therefore, the device is subjected to a voltage equal to VIN-VO,
which must be lower than 36 V (the maximum operating input voltage).
Figure 27.
Negative buck-boost regulator
8.9
Floating boost current generator
The A5975AD does not support a nominal boost conversion as this topology requires a low
side switch, however, a floating boost can be useful in applications where the load can be
floating. A typical example is a current generator for LEDs driving, as the LED does not
require a connection to the ground.
Figure 28.
Floating boost topology
D
5
512
+
----------------
0.706
==
I
SW
I
LOAD
1D
–
---------------
0.5
10.706
–
------------------------
1.7A
==
=
AM09670v1
Ω
A5975AD
6



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