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MCZ5207SG Datasheet(PDF) 10 Page - Shindengen Electric Mfg.Co.Ltd

Part # MCZ5207SG
Description  LLC Current resonant bridge controller
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Manufacturer  SHINDENGEN [Shindengen Electric Mfg.Co.Ltd]
Direct Link  http://www.shindengen.co.jp/
Logo SHINDENGEN - Shindengen Electric Mfg.Co.Ltd

MCZ5207SG Datasheet(HTML) 10 Page - Shindengen Electric Mfg.Co.Ltd

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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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