AN4007 datasheet(16/33 Pages) STMICROELECTRONICS

Teilenummer	AN4007

Bauteilbeschribung	In several applications, such as LCD or plasma TVs

PDF	33 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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16 / 33 page

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

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AN4007 Datenblatt(PDF) 16 Page - STMicroelectronics