EL7571C 데이터 시트보기 (PDF) - Elantec -> Intersil

부품명

상세내역

제조사

EL7571C

Programmable PWM Controller

Elantec -> Intersil 

EL7571C

Programmable PWM Controller

PCB Layout Considerations

1. Place the power MOSFET’s as close to the con-

troller as possible. Failure to do so will cause

large amounts of ringing due to the parasitic

inductance of the copper trace. Additionally, the

parasitic capacitance of the trace will weaken the

effective gate drive. High frequency switching

noise may also couple to other control lines.

2. Always place the by-pass capacitors (0.1µF and

1µF) as close to the EL7571C as possible. Long

lead lengths will lessen the effectiveness.

3. Separate the power ground (input capacitor

ground and ground connections of the Schottky

diode and the power MOSFET’s) and signal

grounds (ground pins of the by-pass capacitors

and ground terminals of the EL7571C). This will

isolate the highly noisy switching ground from

the very sensitive signal ground.

4. Connect the power and signal grounds at the out-

put capacitors. Output capacitor ground is the

quietest point in the converter and should be

used as the reference ground.

5. The power MOSFET’s output inductor and

Schottky diode should be grouped together to

contain high switching noise in the smallest area.

6. Current sense traces running from pin 11 and pin

12 to the current sense resistor should run paral-

lel and close to each other and be Kelvin

connected (no high current flow). In high current

applications performance can be improved by

connecting low Pass filter (typical values 4.7Ω,

0.1µF) between the sense resistor and the IC

inputs.

19

Share Link: