IRDC3843 International Rectifier, IRDC3843 Datasheet - Page 2

• Manufacturer Part Number: IRDC3843
• Description: BOARD, EVALUATION, IR3843
• Manufacturer: International Rectifier
• Type: DC-DC Voltage Regulatorr

Specifications of IRDC3843

• Svhc: No SVHC (15-Dec-2010)
• Kit Features: Programmable Soft Start, Programmable Over Current Protection, Pre-Bias Start Up
• Mcu Supported Families: IR3843
• Silicon Manufacturer: International Rectifier
• Kit Contents: Board
• Features: Compact, High Performance And Flexible Solution, 600kHz Frequency
• Core Architecture: Power Management -
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LAYOUT
The PCB is a 4-layer board. All of layers are 2 Oz. copper.
mounted on both sides.
Power supply decoupling capacitors, the Bootstrap capacitor and feedback components are located
close to IR3843A. The feedback resistors are connected to the output voltage at the point of regulation
and are located close to the SupIRBuck. To improve efficiency, the circuit board is designed to
minimize the length of the on-board power ground current path.
CONNECTIONS and OPERATING INSTRUCTIONS
A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum 3A load should be
connected to VOUT+ and VOUT-. The connection diagram is shown in Fig. 1 and inputs and outputs of the
board are listed in Table I.
IR3843A has two input supplies, one for biasing (Vcc) and the other as input voltage (Vin). Separate
supplies should be applied to these inputs. Vcc input should be a well regulated 4.5V-5.5V supply and it
would be connected to Vcc+ and Vcc-.
02/09/10
Connection
VIN+
VIN-
Vcc+
Vcc-
VOUT-
VOUT+
Enable
Seq.
PGood
Table I. Connections
Signal Name
V
Ground of V
Vcc input
Ground for Vcc input
Ground of V
V
Enable
Sequence Input
Power Good Signal
in
out
(+12V)
(+1.8V)
in
out
It
is a double sided board with components
IRDC3843A
2