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AN2559 Datasheet(PDF) 33 Page - STMicroelectronics

Part # AN2559
Description  System power supply board for digital solutions
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2559 Datasheet(HTML) 33 Page - STMicroelectronics

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AN2559
Measurements
33/35
6.2.3
Transient
Transient responses were measured only for VAUX and VSYS. The transient responses are
displayed in Figure 34 and Figure 35. The transient waveforms of the L5970AD section
show the response time. The most visible difference between the L5970AD in classic
voltage mode and the PM6680A working in Constant On Time mode is the reaction when
there is a fast load increase. Whereas the PM6680A reacts asfast as possible on the rising
load, the L5970AD will wait short time as the compensation network is implemented in
feedback loop (see Figure 24 and Figure 25).
Figure 34.
Transient response of VSYS based on the L5970AD
Figure 35.
Transient response of VAUX generated by the LDO KF25



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