MB3825A

22

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

0

t

× 60

× 1

GND (O)

CB2

10 k

Ω

100 k

Ω

VCC(O)

CB1

OUT1

VB

Figure 3. Output circuit (main side)

Figure 4. Output current waveform

External PNP transistor

Sink current

Source

current

Output ON

base current

speed-up

Output OFF

driver

To PWM

comparator

Source current (peak)

Speed-up current

Output current

Sink current