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FREQ 数据表(PDF) 13 Page - fujitsu semiconductor

部件名 FREQ
功能描述  2ch DC/DC converter IC with PFM/ PWM synchronous rectification
PDF  56 Pages
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制造商  FUJITSU [fujitsu semiconductor]
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标志 FUJITSU - fujitsu semiconductor

FREQ 数据表(HTML) 13 Page - fujitsu semiconductor

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13
MB39A214A
Limitation : development tool vendor use only
FUJITSU SEMICONDUCTOR CONFIDENTIAL
DS405-00007-1v0-E
FUNCTION
Bottom detection comparator system for low output voltage ripple
The bottom detection comparator system for low output voltage ripple determines the ON time (tON) using
the input voltage (VIN) and output voltage (VOUT) to hold the ON state to a specified period. During the OFF
period, the reference voltage (INTREF) is compared with the feedback voltage (FB) using the error
comparator (Error Comp.). When the feedback voltage (FB) is below the reference voltage (INTREF) ,
RS-FF is set and the ON period starts again. Switching is repeated as described above. Error Comp. is used
to compare the reference voltage (INTREF) with the feedback voltage (FB) to control the off-duty condition
in order to stabilize the output voltage.
This system adds the inductor current slope detected during the synchronous rectification period (tOFF) to
the reference voltage (INTREF) , and generates an output voltage slope during the OFF period, which is
essential for the bottom detection comparator system, in the IC. This enables the stable control operations
under the low output voltage ripple conditions.
Circuit diagram
Bias
tON
generator
Slope
Detector
Drive
Logic
INTREF
VREF
VIN
IL
S
VOUT
Bias
Reg.
Lo-side
Drive
FB
-
+
RS-FF
<Error Comp.>
RQ
Hi-side
Drive
RS out
VIN
VOUT
tON
DRVH
DRVL
+
-
Waveforms
t
tON
tOFF
INTREF
DRVH
FB
IL



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