DEMO MANUAL DC1830A-A/DC1830A-B LTC4000 Battery Charger Controller and PowerPath Manager
●Demonstration circuit 1830A is a battery charger controller and PowerPath™ manager featuring the LTC®4000. This board should be connected to a front-end DC/DC power supply for a complete charger solution.
●The DC1830A is customizable to handle a wide variety of applications with output voltages from 3V to 30V and output currents up to 6.5A with the PFETs supplied, and up to 60V and/or 13A with higher voltage rating and/or added PFETs. The reference design provided with DC1830A is targeted at 4-cell LiFePO4 (14.6V/5A) applications.
●The DC1830A loop compensation values were proven with the LTC3845A buck power converter shown and are typical for other applications.
The output of this demo board was specifically tailored for a Tenergy 10A-hour battery, P/N 30207. Other voltages can be set by changing ROFB2 and RBFB2. The desired nominal voltage can be accurately trimmed by using trim resistors ROFBX and RBFBX. For example, for 14.4V battery float voltage, change ROFB2 and RBFB2 to 86.6k, and add 7.5M at ROFBX and RBFBX for greater setpoint accuracy. Other parameters can be adjusted to suit specific applications with guidance provided in the LTC4000 data sheet. Table 1 provides a summary of parameter adjustments.
●This circuit was designed to demonstrate the high levels of performance and small solution size attainable using this IC to control a switch mode power converter to form a battery charger, intelligent PowerPath manager, and power supply system. It produces a regulated 5.0A/14.6V battery charger output as well as a system output of up to 5.5A: suitable for a wide variety of portable applications including instruments, industrial equipment, power tools and computers.
●The DC1830A-A provides a solution complete with both battery charger control and PowerPath managment. It includes a second PFET (Q2) between VOUT-SYS and BAT to provide Instant-On functionality which keeps VOUT-SYS within a narrow range regardless of battery voltage, and disconnects the battery when it is fully charged and power is available from the front-end DC/DC converter. Thermal regulation circuitry is also provided to limit the temperature of both PFETs. The DC1830A-B provides a simple battery-charger-controller only solution without the PowerPath manager. It deletes the second PFET and thermal regulation circuitry. In this case, the battery is always “online” and VOUT-SYS tracks the BAT Voltage.
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Datasheet |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2017/12/10 |
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dc1830af |
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1.7 MB |
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