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LMZ14201TZX-ADJ Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMZ14201TZX-ADJ Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 18 page  Current Limit 3.3V OUT@ 25°C 30114654 Current Limit 3.3V OUT@ 85°C 30114668 Application Block Diagram 30114608 COT Control Circuit Overview Constant On Time control is based on a comparator and an on-time one shot, with the output voltage feedback compared with an internal 0.8V reference. If the feedback voltage is be- low the reference, the main MOSFET is turned on for a fixed on-time determined by a programming resistor R ON. RON is connected to V IN such that on-time is reduced with increasing input supply voltage. Following this on-time, the main MOS- FET remains off for a minimum of 260 ns. If the voltage on the feedback pin falls below the reference level again the on-time cycle is repeated. Regulation is achieved in this manner. Design Steps for the LMZ14201 Application The LMZ14201 is fully supported by Webench® and offers the following: Component selection, electrical and thermal simulations as well as the build-it board for a reduction in de- sign time. The following list of steps can be used to manually design the LMZ14201 application. • Select minimum operating V IN with enable divider resistors • Program V O with divider resistor selection • Program turn-on time with soft-start capacitor selection • Select C O • Select C IN • Set operating frequency with R ON • Determine module dissipation • Layout PCB for required thermal performance ENABLE DIVIDER, R ENT AND RENB SELECTION The enable input provides a precise 1.18V band-gap rising threshold to allow direct logic drive or connection to a voltage divider from a higher enable voltage such as V IN. The enable input also incorporates 90 mV (typ) of hysteresis resulting in a falling threshold of 1.09V. The maximum recommended voltage into the EN pin is 6.5V. For applications where the midpoint of the enable divider exceeds 6.5V, a small zener can be added to limit this voltage. The function of this resistive divider is to allow the designer to choose an input voltage below which the circuit will be dis- www.national.com 10 |
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