MB3832A データシートの表示（PDF） - Fujitsu

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MB3832A

DC/DC Converter IC for Charging

Fujitsu 

MB3832A

s METHODS OF SETTING THE SOFT START TIME

To prevent surge currents when the IC is turned on, you can set a soft start using the DTC terminal (pin 16).

When power is switched on, the current begins charging the capacitor (Cdt) connected the DTC terminal. The

soft start process operates by comparing the soft start setting voltage, which is proportional to the DTC terminal

voltage, with the triangular waveform, and varying the ON-duty of the OUT terminal (pin 19).

The soft start time until the ON duty reaches 50 % is determined by the following equation:

For figure c

Soft start time (time until output ON duty = 50%)

ts (s) = Cdt (F) × Rdt (Ω) × ln(1 − 1.6/2.5) =: 1.022 × Cdt (F) × Rdt (Ω)

For figure d

Soft start time (time until output ON duty = 50%)

ts (s) = −

Cdt (F) × R1 (Ω) × R2 (Ω)

R1 (Ω) + R2 (Ω)

× ln (1 −

1.6 (R1 (Ω) + R2 (Ω)) )

2.5R2 (Ω)

• Figure c Setting a soft start

1 VREF

Rdt

16 DTC

Cdt

• Figure d Setting the dead time and a soft start

1 VREF

R1

16 DTC

Cdt

R2

18

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