IR3651STRPBF International Rectifier, IR3651STRPBF Datasheet - Page 18
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IR3651STRPBF
Manufacturer Part Number
IR3651STRPBF
Description
IC CTLR PWM SYNC DC-DC 14SOIC
Manufacturer
International Rectifier
Datasheet
1.IR3651SPBF.pdf
(19 pages)
Specifications of IR3651STRPBF
Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
460kHz
Duty Cycle
80%
Voltage - Supply
4.5 V ~ 13.2 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 125°C
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Frequency-max
460kHz
Package
14-Pin SOIC (NB)
Circuit
Sync PWM Controller
Vcc (min)
4.5
Vcc (max)
13.2
Iout (a)
25
Switch Freq (khz)
programmable to 400kHz
Pbf
PbF Option Available
For Use With
IRDC3651 - KIT REF DESIGN SYNCH BUCK REG
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
IR3651STRPBF
Manufacturer:
IR
Quantity:
20 000
12/07/2010
Layout Consideration
The layout is very important when designing high
frequency switching converters. Layout will affect
noise pickup and can cause a good design to
perform with less than expected results.
Start to place the power components, make all
the connection in the top layer with wide, copper
filled areas.
The inductor, output capacitor and the MOSFET
should be close to each other as possible. This
helps to reduce the EMI radiated by the power
traces due to the high switching currents through
them. Place input capacitor directly to the drain of
the high-side MOSFET, to reduce the ESR
replace the single input capacitor with two
parallel units
Part Marking Information
.
The feedback part of the system should be kept
away from the inductor and other noise sources.
The
capacitors for Vcc, DRVc and Vb should be close
to respective pins. It is important to place the
feedback
resistors and compensation components close to
Fb and Comp pins.
In multilayer PCB use one layer as power ground
plane and have a control circuit ground (analog
ground), to which all signals are referenced. The
goal is to localize the high current path to a
separate loop that does not interfere with the
more sensitive analog control function. These two
grounds must be connected together on the PC
board layout at a single point.
critical
components
bypass
components
including
IR3651SPBF
such
feedback
as
18