MB3785A Datasheet, PDF (22/29 Pages) Fujitsu Component Limited. – Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities)

MB3785A
Figure 11. When Using DTC to Set Dead
Time
Figure 12. When Not Using DTC
19 VREF
R1
DTC3
(DTC4)
Vdt
R2
19 VREF
DTC3
(DTC4)
<Precautions>
When you use a ceramic resonator, pay attention when setting the dead time because the triangular-wave amplitude
is determined by the values of CT and RT.
2. Soft Start
To prevent inrush current at power switch-on, the device can be set for soft start by using the DTC terminals (pins
4, 9, 28, and 33). The diagrams below show how to set.
Figure 13. Setting Soft Start for CH1 and
CH2
Figure 14. Setting Soft Start for CH3 and
CH4
19 VREF
Cdt
Rdt
DTC1
(DTC2)
Rdt
Cdt
19 VREF
DTC3
(DTC4)
22