FEB167

FEB167 Datasheet

FEB167-002 User Guide FAN2106

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FEB167	FEB167 (pdf)

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FEB167-002 User Guide FAN2106 TinyBuck Integrated Synchronous Buck Evaluation Board Featured Fairchild Product FAN2106 2007 Fairchild Semiconductor Corporation Table of Contents Board Configuration 3 Power-Up 3 Board Features 4 Switching Waveform 4 Enable / 4 Current Limit 4 Switching 4 Output 4 Feedback Loop 4 Schematics 5 Bill of Materials 5 Assembly 7 PCB 7 2007 Fairchild Semiconductor Corporation This guide supports the evaluation kit for the FAN2106 TinyBuck Integrated Synchronous Buck. This guide should be used in conjunction with the FAN2106 datasheet, located at Fairchild’s website Overview This board provides 1.8VOUT and 0-6A from 8-20VIN at a 500KHz switching rate using low-cost ceramic output capacitors. Figure Evaluation Board and Required Connections Board Configuration Output Voltage Output Current Input Voltage Frequency: 1.8V 0-6A 8-20V 500KHz Power-Up Sequence Establish connections to test equipment as shown in the schematic in Figure Use suitable diameter wires and connectors to avoid excessive voltage drop or temperature rise. Do not turn on power supplies until all the connections are complete. Verify voltage sources have current limits adequately set to supply the load. Apply VIN before VCC to avoid skipping the soft-start cycle. Apply the desired load current. This can be done at any time, including before power-up, but it is recommended to power-up the first time with 0A load to verify proper connections. To power down, turn off the VCC 5V supply first. 2007 Fairchild Semiconductor Corporation Board Features Facility to make a ground strap is provided near the lower-left corner of the evaluation board to facilitate oscilloscope probe connections. Switching Waveform Connect an oscilloscope probe to test point marked SW to view the switching waveform. Since the MOSFETs are integrated, gate/drive waveforms cannot be viewed. Enable / Inhibit The momentary push-button switch S1 establishes a connection from EN to GND, inhibiting the FAN2106 when switching ceases and only standby current flows at VIN and VCC. A new soft-start cycle commences upon release of S1. Current Limit The current limit threshold can be set lower by reducing R9. This feature is useful in applications where <6A is required, allowing the designer to select passive external components with lower current ratings. With R9 open, the FAN2106 enforces a maximum default current limit in excess of 6A. Auto-Restart The board is configured for auto-restart with a delay C7 that increases linearly with C7. Refer to the datasheet for auto-restart or latch-off options. Switching Frequency Switching frequency is set by R10 RT . Frequency may be lowered to 200KHz or raised to >600KHz.

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FEB167-002 User Guide FAN2106

TinyBuck Integrated Synchronous Buck Evaluation Board

Featured Fairchild Product FAN2106
2007 Fairchild Semiconductor Corporation

Table of Contents

Board Configuration 3

Power-Up 3

Board Features 4 Switching Waveform 4 Enable / 4 Current Limit 4 Switching 4 Output 4 Feedback Loop 4

Schematics 5

Bill of Materials 5

Assembly 7

PCB 7
2007 Fairchild Semiconductor Corporation

This guide supports the evaluation kit for the FAN2106 TinyBuck Integrated Synchronous Buck. This guide should be used in conjunction with the FAN2106 datasheet, located at Fairchild’s website

Overview

This board provides 1.8VOUT and 0-6A from 8-20VIN at a 500KHz switching rate using low-cost ceramic output capacitors.

Figure Evaluation Board and Required Connections

Board Configuration

Output Voltage Output Current Input Voltage Frequency:
1.8V 0-6A 8-20V 500KHz

Power-Up Sequence

Establish connections to test equipment as shown in the schematic in Figure Use suitable diameter wires and connectors to avoid excessive voltage drop or temperature rise.

Do not turn on power supplies until all the connections are complete.

Verify voltage sources have current limits adequately set to supply the load.

Apply VIN before VCC to avoid skipping the soft-start cycle. Apply the desired load current.

This can be done at any time, including before power-up, but it is recommended to power-up the first time with 0A load to verify proper connections.

To power down, turn off the VCC 5V supply first.
2007 Fairchild Semiconductor Corporation

Board Features

Facility to make a ground strap is provided near the lower-left corner of the evaluation board to facilitate oscilloscope probe connections.

Switching Waveform

Connect an oscilloscope probe to test point marked SW to view the switching waveform. Since the MOSFETs are integrated, gate/drive waveforms cannot be viewed.

Enable / Inhibit

The momentary push-button switch S1 establishes a connection from EN to GND, inhibiting the FAN2106 when switching ceases and only standby current flows at VIN and VCC.

A new soft-start cycle commences upon release of S1.

Current Limit

The current limit threshold can be set lower by reducing R9. This feature is useful in applications where <6A is required, allowing the designer to select passive external components with lower current ratings.

With R9 open, the FAN2106 enforces a maximum default current limit in excess of 6A.

Auto-Restart The board is configured for auto-restart with a delay C7 that increases linearly with C7. Refer to the datasheet for auto-restart or latch-off options.

Switching Frequency

Switching frequency is set by R10 RT . Frequency may be lowered to 200KHz or raised to >600KHz.

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Datasheet ID: FEB167 514465