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MCZ5207SG Datasheet(PDF) 10 Page - Shindengen Electric Mfg.Co.Ltd |
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MCZ5207SG Datasheet(HTML) 10 Page - Shindengen Electric Mfg.Co.Ltd |
10 / 24 page MCZ5207SG SHINDENGEN ELECTRIC MFG.CO.,LTD - 10 - Operating frequency is varied by controlling Ct discharging current. (Fig.5) Dead time expands according to operating frequency increase, thus ZVS (Zero Voltage Switching) operation can be easily achieved in wide input/output range and various resonant condition. Minimum operating frequency (fmin) is determined by timing capacitor Ct and timing resistor Rt. Maximum operating frequency (fmax) is determined by Ct ,Rt and Rfmax connected in series to FB control loop. Less than 500kHz is recommended in continuous operation. Soft starting frequency (fss) is determined by Ct value, fss and fmax is independent so undesired frequency increase can be avoided under heavy CCM LLC operation. 2.3.3 Brown-out protection (Vsen) Vsen terminal monitors the input bus voltage and determines Csst discharge ON/OFF according to Vsen terminal voltage. This input UVLO function prevents excessive resonant rush current flow and capacitive mode operation under various input brown-out condition. Timing chart of Vsen brown-out protection is shown in Fig. 6 Under input bus voltage increasing condition , Csst starts to be charged when Vsen terminal voltage reaches to Vsen1(ss-reset) 3.55V and Gate output is enabled when SST terminal voltage reaches to Vss(st) 0.6V. Operating frequency decreases according to SST terminal voltage increases. And under input bus voltage decreasing condition, Csst starts to be discharged when Vsen terminal voltage decreases to Vsen2(ss-reset) 3.25V. Operating frequency increases gradually according to SST terminal voltage decreases and Gate output is disabled when SST terminal voltage reaches to less than Vss(sp) 0.5V. Vsen brownout threshold voltage is switched automatically according to AS terminal voltage status. Normal operation (AS OFF) : Vsen ON 3.55V / Vsen OFF 3.25V AS operation mode (AS ON) : Vsen ON 1.0V / Vsen OFF 0.9V Burst operation mode : Vsen ON 1.0V / Vsen OFF 0.9V freq uency vs d uty 20 25 30 35 40 45 50 55 60 0 100 200 300 400 500 600 f requency [k H z] FB=2200pF FB=1800pF FB=1500pF FB=1000pF FB=820pF FB=470pF f requency vs DT 200 300 400 500 600 700 0 100 200 300 400 500 600 f requency [k Hz] FB=2200pF FB=1800pF FB=1500pF FB=1000pF FB=820pF FB=470pF Fig. 5 . Gate output duty/dead time vs frequency Vsen Vc1 FB VGH SST VGL AS 12.9V 0.6V 3.5V 3.2V 0.5V 0.9V 1.0V 0.6V 0.5V Fig. 6 . Brown-out protection timing |
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