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UCC3830SMD-5 Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3830SMD-5 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 10 page 5 UCC3830-4/-5/-6 The curves shown in Figures 1 and 2 depict the typical high gain-bandwidth products for the UCC3830-x Voltage Amplifier, Current Amplifier and Current Sense Ampli- fiers. These high gain-bandwidth devices help achieve an excellent transient response to load and line changes. TYPICAL PERFORMANCE CURVES Figure 1. Open loop gain for UCC3830 voltage and current amplifier. Figure 2. Current sense amplifier gain vs frequency. Short Circuit Current Limit The short circuit current limit, ISC, is set according to: ISC = 1.28V RSENSE • GCSA where RSENSE is the average current sense resistor and GCSA is the current sense amplifier gain. GCSA equals 15. Example: Choose RSENSE to set the short circuit limit at 17A using the UCC3830-5 RSENSE = 1.28V 17A • 15 = 0.005 Ω. A lower resistance value may be needed if the AC ripple current in the inductor is more than 20% of the load cur- rent. APPLICATION INFORMATION Figure 3. Short circuit foldback reduces stress on circuit components by reducing short circuit current. VSENSE (Output Voltage Sensing Input): This pin is connected to the system output voltage through a low pass filter. When the voltage on VSENSE rises above or falls below the COMMAND voltage by 8.5%, the PWRGOOD output is driven low to reset the microprocessor. When the voltage on VSENSE rises above the COMMAND voltage by 17.5%, the OVP comparator pulls the current amplifier output voltage below the oscillator valley voltage to force zero duty cycle at the GATE output. This pin is also used by the foldback current limiting circuitry. PIN DESCRIPTIONS (cont.) |
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