MB3825A 데이터 시트보기 (PDF) - Fujitsu

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MB3825A

6-ch DC/DC Converter IC With Synchronous Rectifier

Fujitsu 

MB3825A

s METHOD OF SETTING THE OUTPUT CURRENT

Figure 3 shows the configuration of the output circuits, and Figure 4 illustrates how the sink current value of the

output current waveform has a constant current setting. Note that the sink current is set by the following formula

• Sink current = (VB/RB) × 60 56/RB [A]

Figure 3. Output circuit (main side)

Output ON

base current

speed-up

VB

External PNP transistor

RB VB

VCC(O)

100 kΩ

Source

current

CB1

OUT1

10 kΩ

To PWM

comparator

Output OFF

driver

CB2

Sink current

×1

× 60

GND (O)

Figure 4. Output current waveform

Speed-up current

Sink current

Output current 0

Source current (peak)

t

21

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