User guide

UM10533 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
User manual Rev. 1 — 21 May 2012 10 of 23
NXP Semiconductors
UM10533
TEA1723BT GreenChip SP SMPS demo board
5.6 Output voltage ripple performance
Test condition: Output voltage ripple is measured using an oscilloscope probe connected
to the demo board output. A probe tip was used with a very small GND connection. A
100 nF capacitor between output voltage and GND is used to reduce high frequency
noise. The output voltage ripple was measured at full load and at V
mains
= 230 V.
Figure 8
shows the output voltage ripple at 2.1 A load at 230 V. The output ripple voltage
is 240 mV using output capacitors C5/C6 as 470 F.
(1) CH1 = V
DRAIN
.
(2) CH2 = V
CC
.
(3) CH3 = I
O
.
(4) CH4 = V
O
.
Fig 8. Short-circuit of the output