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AN4007 Fiches technique(PDF) 16 Page - STMicroelectronics

No de pièce AN4007
Description  In several applications, such as LCD or plasma TVs
PDF  33 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4007 Fiches technique(HTML) 16 Page - STMicroelectronics

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Test board: design and evaluation
AN4007
16/33
Doc ID 022455 Rev 2
Figure 16.
Output voltage ripple during burst mode and 230 VAC
1.6
Dynamic step load regulation
In any power supply it is important to measure the output voltage when the converter is
submitted to dynamic load variations, in order to be sure that good stability is ensured and
no overvoltage on undervoltage occurs.
The board under evaluation was submitted to dynamic load variations from 0 to 50% loads
(
Figure 17), from 50% to 100% loads (Figure 18) and from 0 to 100% loads (Figure 19).
In any tested condition, no abnormal oscillations were noticed on the output and the
over/undershoot were well within acceptable values.
AM11355v1
Ch1 (Pk-Pk): 27.27 mV
Ch2 (Pk-Pk): 64.68 mV
M: 400.0 µs/div
VOUT_PRE
VOUT



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