IRDC3637 Infineon

IRDC3637EVAL IR3637 EVALUATION BOARD USER GUIDE DESCRIPTION The IR3637 controller IC is designed to The reference board is designed for provide a low cost synchronous Buck 1.8V output using +5V and +12V regulator for on-board DC to DC supplies. This will demonstrate the applications in a small 8-pin SOIC. The main features of IC. output voltage can be precisely regulated This user guide contains the schematic using the internal 0.8V reference voltage and bill of materials, the design for low voltage applications. guidelines are described in data sheet. The IR3637 operates at a fixed internal SPECIFICATION DATA 400KHz switching frequency to reduce the V = 12V component size. c The device features under-voltage lockout V =V =5V cc in for both input supplies, an external V =1.8V out programmable soft-start function as well as Iout =7A output under-voltage detection that latches Output Ripple = 50mV off the device when an output short is F = 400KHz s detected. INPUT / OUTPUT CONNECTIONS The connection points are shown in Figure1. Connect the power supply The following is the input / output connections: cables according to this figure, Inputs: minimizing wire lengths to reduce JP1: Input (+5V) and GND losses in the wire. Test points J1 and JU1: V c J2 provide easy connection for Outputs: oscilloscope voltage probe to monitor JP2: V (+1.8V) and GND out the inductor points and output voltage. Other Connections: J1: Scope connection for V out J2: Scope connection for Inductor Point PACKAGE INFORMATION Fb 1 8 SS/SD Vcc 2 7 Comp LDrv 3 6 Vc Gnd 4 5 HDrv Rev1.0 1 4/29/2005IRDC3637EVAL CONNECTION DIAGRAM +12V Supply +5V 7A Supply Load Figure 1 Connection diagram of evaluation board for IR3637 Rev1.0 2 4/29/2005