nx2114 Microsemi Corporation, nx2114 Datasheet - Page 16

• Manufacturer Part Number: nx2114
• Description: 300khz & 600khz Synchronous Pwm Controller
• Manufacturer: Microsemi Corporation

cap which usually is 1uF
ing the drain pin of the upper MOSFET, a plane connec-
tion is a must.
as to the load as possible and plane connection is re-
quired.
the high-side MOSFET need to be connected thru a plane
ans as close as possible. A snubber nedds to be placed
as close to this junction as possible.
nected to the GND plane with multiple vias. One is not
enough. This is very important. The same applies to the
output capacitors and input capacitors.
MOSFET gate as possible. The gate traces should be
wide and short. A place for gate drv resistors is needed
to fine tune noise if needed.
passing capacitor needs to be placed first around the IC
and as close as possible. The capacitor on comp to
GND or comp back to FB needs to be place as close to
the pin as well as resistor divider.
back to the resistor divider should not go through high
frequency signals.
plane.
kept away from the inductor and other noise sources,
and be placed close to the IC.
analog ground. These two grounds must be connected
together on the PC board layout at a single point. The
goal is to localize the high current path to a separate
loop that does not interfere with the more sensitive ana-
log control function.
Rev. 4.0
06/20/06
3. The output capacitors should be placed as close
4. Drain of the low-side MOSFET and source of
5. Source of the lower MOSFET needs to be con-
6. Hdrv and Ldrv pins should be as close to
7. Vcc capacitor, BST capacitor or any other by-
8. The output sense line which is sensing output
9. All GNDs need to go directly thru via to GND
10. The feedback part of the system should be
11. In multilayer PCB, separate power ground and
need to be practically
touch-
NX2114/2114A
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