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Garmin MC34676B 8 Test Setup with the Evaluation Board

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Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0

Freescale Semiconductor 11

Test Setup with the Evaluation Board

8 Test Setup with the Evaluation Board

The test setup is shown in Figure 8 and Figure 9. Connect a DC power source with a larger than 2.0A current limit to

the AC pad or a USB power port to the USB pad on the evaluation board. Connect the positive and negative polarities

of the Li+ battery to the VBAT pad and the GND pad on the evaluation board respectively. Use a current meter and a

voltage meter to measure the charge current and the voltage respectively. Turn on the power supply and let the VBATDET

is less than 1.75V to enable the MC34676B, then the evaluation board starts charging the battery.

Figure 8. The AC Charger Set Up for the Evaluation Board

Figure 9. The USB Charger Set Up for the Evaluation Board

A AV

DC

Power

Source Li+

Battery

A AV

USB

Power

Port

Li+

Battery

Contents

Main Freescale Semiconductor Users Guide Document Number: KT34676BUG Rev. 1.0, 2/2009 1Purpose Using the High Input Voltage Charger for Single Cell Li-Ion Batteries (KIT34676EPEVBE) Contents Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0 Application Diagram 3 Application Diagram 3.1 Dual-Input Standalone Charger Figure 2. The Li-Ion Charger Embedded in the Hand Held System Figure 1. The dual-input Li-Ion Charger 3.2 Embedded Charger 4 Evaluation Board Specification Figure 3. The Schematic Circuit of the Evaluation Board 5 Component Selection 5.1 Input capacitors C1 and C3 5.2 Output capacitors C4 and C5 5.3 AC CC-mode charge current setting resistors R1, R2, and R3 5.4 USB CC-mode charge current setting resistors R8 and R9 5.5 End-of-charge current setting resistors R10 and R11 Table 2. The USB CC-mode Charge Current Settings Table 3. The EOC Current Settings Page Page 6.2 Layout considerations 7 Evaluation Board Configuration 7.1 Pin Headers Table 4. The Default Settings of the Pin Headers 7.2 Connector Pads Table 4. The Default Settings of the Pin Headers 7.3 Test Points 8 Test Setup with the Evaluation Board Figure 8. The AC Charger Set Up for the Evaluation Board Figure 9. The USB Charger Set Up for the Evaluation Board Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0 12 Freescale Semiconductor Bill of Material 9 Bill of Material Item Qty Part Reference Value DESCRIPTION Footprint Mfr PN 10 References How to Reach Us: