EVL150W-ADP-SR 查看數據表（PDF） - STMicroelectronics

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EVL150W-ADP-SR

12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6599A, and SRK2000

STMicroelectronics 

Functional check

AN3233

In Figure 13 it can be noted that the resonant current at turn-on has some oscillations due to

the charging of the resonant elements. However, current zero-crossing always lags the HB

commutations and, consequently, MOSFETs are soft switched.

Figure 14 shows the resonance current at shutdown. Due to input voltage dip, the LLC stage

operates below resonance, but current still lags the HB voltage.

Avoiding hard switching also during transitions like startup and shutdown is a must for a

reliable design, because some hard switching commutations could also damage the

converter.

Figure 13. Startup resonant current

Figure 14. Shutdown resonant current

CH1: Half-bridge

CH3 C6 voltage

CH4: Res. tank current

CH1: Half-bridge

CH4: Res. tank current

No-load operation

In Figure 15 and 16, some burst mode waveforms are captured. As seen, both L6599A and

L6563H operate in burst mode. In Figure 16, it is possible to see that PFC and LLC bursts

are synchronized.

Figure 15. No-load operation

Figure 16. No-load operation – detail

CH1: LVG pin

CH3: Output voltage

CH2: PFC gate

CH4: STBY pin

CH1: Half-bridge

CH3: PFC-STOP pin

CH2: PFC Drain

CH4: STBY pin

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Doc ID 17595 Rev 1

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