el7571c ETC-unknow, el7571c Datasheet - Page 19

• Manufacturer Part Number: el7571c
• Description: Programmable Controller
• Manufacturer: ETC-unknow

PCB Layout Considerations
1. Place the power MOSFET’s as close to the con-
2. Always place the by-pass capacitors (0.1µF and
3. Separate the power ground (input capacitor
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.
1µF) as close to the EL7571C as possible. Long
lead lengths will lessen the effectiveness.
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.
19
4. Connect the power and signal grounds at the out-
5. The power MOSFET’s output inductor and
6. Current sense traces running from pin 11 and pin
put capacitors. Output capacitor ground is the
quietest point in the converter and should be
used as the reference ground.
Schottky diode should be grouped together to
contain high switching noise in the smallest area.
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 4.7
inputs.
1µF) between the sense resistor and the IC
Programmable PWM Controller
EL7571C