GL34D datasheet(21/25 Pages) INFINEON

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12W 5V SMPS evaluation board with ICE3AR4780VJZ

Waveforms and scope plots

Application Note

Revision 1.2, 2015-05-12

11.7

Output ripple voltage during burst mode at 1 W load

Channel 1; C1 : Output ripple voltage (Vo)

Channel 2; C2 : Output current (Io)

Channel 1; C1 : Output ripple voltage (Vo)

Channel 2; C2 : Output current (Io)

Vripple_pk_pk=25mV

Probe terminal end with decoupling capacitor of

0.1μF(ceramic) & 1μF(Electrolytic), 20MHz filter

Vripple_pk_pk = 18mV

Probe terminal end with decoupling capacitor of

0.1μF(ceramic) & 1μF(Electrolytic), 20MHz filter

Figure 27 AC output ripple @ 85Vac and 1W

load

Figure 28 AC output ripple @ 265Vac and 1W

load

11.8

Active Burst mode operation

Channel 1; C1 : Current sense voltage (VCS)

Channel 2; C2 : Supply voltage (VCC)

Channel 3; C3 : Feedback voltage (VFBB)

Channel 4; C4 : BV voltage (VBV)

Channel 1; C1 : Current sense voltage (VCS)

Channel 2; C2 : Supply voltage (VCC)

Channel 3; C3 : Feedback voltage (VFBB)

Channel 4; C4 : BV voltage (VBV)

Condition: VFB<1.27V & last for 20ms

(load change form full load to 0.5W load)

Condition: VFB>4.5V

(load change form 0.5W load to full load)

Figure 29 Entering active burst mode @

85Vac

Figure 30 Leaving active burst mode @ 85Vac

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