IR3651SPBF Datasheet, PDF (1/19 Pages) International Rectifier – HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER

Data Sheet No.PD94720
IR3651SPbF
HIGH VOLTAGE SYNCHRONOUS PWM BUCK CONTROLLER
Features
• High Voltage Operating up to 75V
• Programmable Switching Frequency up to 400kHz
• 1A Output Drive Capability
• Precision Reference Voltage (1.25V)
• Programmable Soft-Start
• Programmable Over Current Protection
• Hiccup Current Limit Using MOSFET R_DS(on)
sensing
• External Frequency Synchronization
• 14-pin SOIC Package
Applications
• 48V non-isolated DC to DC Converter
• Embedded Telecom Systems
• Networking and Computing Voltage Regulator
• Distributed Point of Load Power Architectures
• General high voltage DC/DC Converters
Description
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 such as under
voltage lockout and hiccup current limit are
provided to give required system level security in
the event of fault conditions.
Vaux=12V
Vin: 12V-75V
C2
R5
C6
10/11/2006
C3
DRVcc
Vcc
Vb
HDrv
SYNC
Vs
Rt ^IR3651S
OCset
SS/SD
LDrv
PGnd
Gnd _Comp Fb
C1
C4
Q1
ROCset
Q2
C7 _R4
L1
C8
Vout
C5
R1 ^R3
C9
R2
C10
Typical application Circuit
ORDERING INFORMATION
PKG PACKAGE
DESIG DESCRIPTION
S
IR3651SPBF
S
IR3651STRPBF
PIN
COUNT
14
14
PARTS
PER TUBE
55
--------
PARTS
PER REEL
-------
2500
T&R
ORIANTAION
Fig A