FEB138

FAN2001/2 Evaluation Board User Manual

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FAN2001/2 Evaluation Board User Manual

July 2005

FAN2001/2 Evaluation Board User Guide
Features:
2.5 to 5.5V Input Range Up to 1A Output Current Adjustable Output from 0.8V to VIN Thermal Shutdown, Short Circuit Protection, Soft Start, Output Over Voltage Protection 1.3MHz Fixed Frequency PWM Operation at heavy load and Burst Operation at light load Up to 96% Efficiency, Synchronous Operation Pb-Free 6-lead 3x3mm MLP Package

Figure 1: FAN2001 MPX

Description:
The FAN2001/2 Evaluation Board is a compact circuit including either the FAN2001 MPX or the FAN2002 MPX in a 3x3 MLP package. Both models feature an external resistor divider for varying output voltage and differ only in pin out. The FAN2001/2 demo board, a completely assembled and tested surface mount board, provides easy probe access points to all inputs and outputs so that electrical characteristics and waveforms can be easily measured.

Figure 2: FAN2002 MPX

Where To Begin:
1: Connect VIN (2.5 to 5.5V) and Gnd (0V). 2: Use a jumper to toggle the circuit between "ON" and "OFF" modes. 3: Observe that for varying input levels, if VIN VOUT 0.6V and ILOAD 1A, VOUT remains constant. 4: The output voltage level is VOUT VREF (1 (R1/R2)) where VREF 0.8V (typical) and R2 10K. For VOUT 1.2V, R1 is preset to 5K and for VOUT 3.3V, R1 is preset to 31.25K (Note: R2 and R1 values are reversed for FAN2002MPX) 5: To verify supply current in "ON" and "OFF" modes, observe that in shutdown mode, supply current will drop below 1uA and in "ON" mode, Iq 50uA. 6: If quiescent current is a key design parameter a higher value feedback resistor, R2, can be used along with a small bypass capacitor Cf. (e.g. R2 100K and Cf 10pF)
2005 Fairchild Semiconductor Corporation FAN2001/2 Version 1.0 1 www.fairchildsemi.com