IRDC3651
Rev 1.1
12/20/2006
RD-0616
1
USER GUIDE FOR IR3651 EVALUATION BOARD
DESCRIPTION
This user guide contains the schematic and
bill of materials for the IR3651 evaluation
board. The guide describes operation and use
of the evaluation board itself. Detailed
application information for the IR3651
integrated circuit is available in the IR3651
data sheet.
Evaluation Board Specifications:
V
IN
= 48V, tolerance 10%
V
OUT
= 3.3V at 10A
F
S
= 100kHz
CONNECTIONS
J2: V
IN
= 48V
J3: V
OUT
= 3.3V
J4, J7: GROUND
J5: Shutdown control input
J6: Sync input
J1: External 12V supply option.
The IR3651 is a high voltage PWM
controller designed for high performance
synchronous Buck DC/DC applications. The
IR3651 drives a pair of external N-
MOSFETS using a programmable switching
frequency up to 400kHz allows flexibility to
tune the operation of the IC to meet system
level requirements, and synchronization
allows the simplification of system level filter
design. The output voltage can be precisely
regulated using the internal 1.25V reference
voltage for low voltage applications.
Protection functions such as under voltage
lockout and hiccup current limit are provided
to give required system level security in the
event of fault conditions.
