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FREQ датащи(PDF) 15 Page - fujitsu semiconductor

номер детали FREQ
подробное описание детали  2ch DC/DC converter IC with PFM/ PWM synchronous rectification
PDF  56 Pages
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производитель  FUJITSU [fujitsu semiconductor]
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Logo FUJITSU - fujitsu semiconductor

FREQ датащи(HTML) 15 Page - fujitsu semiconductor

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MB39A214A
Limitation : development tool vendor use only
FUJITSU SEMICONDUCTOR CONFIDENTIAL
DS405-00007-1v0-E
(4) Starting sequence
When the EN1 pin (pin 2) or EN2 pin (pin 11) is set to the “H” level, the bias voltage is supplied from the
VB pin. If the voltage of the VB pin exceeds the UVLO threshold voltage, the DC/DC converter starts
operations and carries out the soft start. The soft start is a function used to prevent a rush current when the
power is started.
Activating the soft start initiates charging of the capacitor connected to the CS1 pin (pin 5) and CS2 pin (pin
8) and inputs the lamp voltage to the error comparator (Error Comp.) of each channel. The DC/DC
converter generates the output voltage according to that lamp voltage. This results in the soft start operation
that does not depend on the output load. The over voltage protection (OVP) and under voltage protection
(UVP) functions are disabled while the soft start is active.
<Timing chart>
EN1
VB
CS1
DRVH1
UVLO VTLH
INTREF
INTREF
0.805 V
1.6 V
1.6 V
0.805 V
DRVL1
VOUT1
EN2
CS2
DRVH2
DRVL2
VOUT2
CH1 soft start completed
UVLO release
CH2 soft start completed



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