Ncp3063: Cigarette Lighter Adapter (cla) - Reference Design

The NCP3063 is a hysteretic Regulator with pulse by pulse current limiting and frequency adjustment. The NCP3063 CLA (Cigarette Lighter Adapter) design is configured in a buck topology and the frequency has been set to 53 kHz to reduce switching losses. The DFN package was selected as the exposed pad on the bottom spreads heat to the ground plane and grounding clip. The CLA has several built in safety features the first of which is a fuse F1 shown in layout in Figure 1 and schematically in Figure 3. The fuse serves as a second layer of short Circuit Protection incase the main Switch is shorted. The fuse also serves as reverse polarity protection in the event that positive and negative voltages are reversed on the input. If the opposite polarity is applied at the input the Diode D2 starts to conduct and the fuse F1 is blown protecting the end users device and the rest of the CLA. The designer CAN choose to implement a user replaceable fuse or a one time protection device depending on the user case. The first layer of short Circuit Protection is the pulse by pulse current limiting provided by the NCP3063 which CAN be set by the sense resistor R5. The user Interface indicator R9 and D3 give real time visual feedback to the customer as to the functionality of the adapter. If a short circuit was to occur at the output or the fuse was to blown the LED D3 will cease to illuminate.
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Ncp3063: Cigarette Lighter Adapter (cla) - Reference Design application circuits
Ncp3063: Cigarette Lighter Adapter (cla) - Reference Design application circuits



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