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MCZ5203SE bảng dữ liệu(PDF) 8 Page - Shindengen Electric Mfg.Co.Ltd

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Giải thích chi tiết về linh kiện  Current Resonant Mode Controller for Bridge Converter
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nhà sản xuất  SHINDENGEN [Shindengen Electric Mfg.Co.Ltd]
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SHINDENGEN
ELECTRIC MFG.CO.,LTD
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2.4 Control characteristics
Voltage vs.frequency characteristics are
shown in Fig.5. LLC converter operates
in above-resonance region.
(above ZVS boundary)
Output voltage can be stabilized by varying
operating frequency, decreasing the
operating frequency when input voltage
becomes lower or load becomes larger, and
increasing when higher or smaller
respectively.
Fig.5 Output voltage vs operating frequency characteristics
2.5
Major parameters and components
Table 1. Major parameters
Vc1
IC Vcc supply
15-22Vdc is recommended.(min.14.0V for startup in worst case)
Vbulkreset
Brown–out detection
voltage threshold
Brown-out protection operating voltage. The threshold value is determined
considering resonant condition and hold-up time.
fmin
Minimum frequency
Fmin is determined considering resonant frequency at Vin min / Po
max condition.
fmax
Maximum
frequency
Fmax is determined considering controllable area at Vbulk max with
min load and ZVS condition.
fss
Startup frequency
Fss is determined considering MOSFET Vds,output diode inrush
current and Vout rise timing during startup
tss
Soft starting time
Required soft starting time
tTIMER
Burst mode
operation interval
Especially important for short circuit condition and feedback loop
open condition. See section 3.6
Table 2 .Recommended components
RvsenseH
Vbulk divider high
side
Isense=1uA required
High voltage assured type is recommended.
Ct
Timing capacitor
Ct determines fmin / fmax / fss / DT.Stable temperature characteristics type is
recommended. In case of MLCC, type CH or COG.
RocpH
Current sensing
filtering resistor
Primary current sensing filtering resistor. Around 10 ohm is
recommended.
CocpL
Current sensing
filtering capacitor
Primary current sensing filtering capacitor.1000pF-10000pF.
Rfb
I(F/B) limitation
resistor
Limiting I(F/B) and setting fmax. Normally a few k ohms.
Refer to characteristic diagrams.
Table 3. Circuit constants obtained from the formulas
RvsenseL
Vbulk divider low
side
Obtained from Vbulkreset and
RvsenseH.
Rt
Timing resistor
Obtained from fmin and Ct
Rocpdet
Sensing resistor
Primary resonant current sensing
RocpL
OCP sensing
divider
Primary current sensing voltage divider
Css
Soft start timing
capacitor
Obtained from tss.
Ctimer
Burst operation
timing capacitor
Obtained from ttimer
ZVS boundary
Vout
frequency


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