FEB130

FAN5606 Evaluation Board User Manual

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FAN5606 Evaluation Board User Manual

July 2005

FAN5606 Evaluation Board User Manual
2.7 to 5V Input Range Up to 25mA Output Current Digital, Analog and PWM Brightness Control Drives Up to Six LEDs in Series Open Circuit Protection, Shutdown Mode and Soft Start .5MHz Operating Frequency Up to 90% Peak Efficiency Small 8-lead 3x3mm MLP Package
Figure 1: FAN5606 DMPX

Description:
The FAN5606 Evaluation Board is a compact circuit including the FAN5606 DMPX in a 3x3 MLP package and one small 4.7uF capacitor which can provide stable output current for up to six of Fairchild s super bright white LEDs. The FAN5606 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.

Where To Begin:
1: Connect Vin1 (2.7 to 5V) and Gnd (0V). 2: For analog mode, ground input "B" (pin 2) and connect input "A" (pin 1) to a fixed supply voltage through resistor R1. 3: For digital mode, select 5mA (A 1,B 0), 10mA (A 0,B 1), or 20mA (A 1,B 1). Use a jumper to connect input "A" directly to Vin or Gnd and input "B" directly to Vin or Gnd. (Note: input "A" and input "B" must be connected to either Vin or Gnd at all times) 4: To verify output current or change the number of operating LEDs, apply jumpers to pins JP1 and JP2. (Observe that the current remains constant for varying input voltage levels) 5: To verify supply current in "ON" and "OFF" modes, observe that in shutdown mode, supply current will drop below 1uA. 6: If you choose, you may add a capacitor C1 and inductor L2 to reduce ripple at the battery input. 7: The Zener diode CR7 protects the IC in the event of a sudden load disconnection. 8: In analog mode ILED (VCTRL 1.2V) / R1 x multiplication ratio (Note: R1 86.6K is chosen to set ILED to 20mA
when VCTRL 3V). The resistances of R1 and R2 may be lowered to accommodate lower values of VCTRL.
2005 Fairchild Semiconductor Corporation FAN5606 Version 1.0 1 www.fairchildsemi.com