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UCC3913 Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3913 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 9 page 5 UCC1913 UCC2913 UCC3913 IOUT IMAX IFAULT Io(nom) 0A VCT 2.5V 0.5V 0V 0V VOUT VSS t0 t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t t t Output Current CT Voltage (w/respect to VSS) Output Voltage (w/respect to GND) APPLICATION INFORMATION (cont.) Figure 2. Typical timing diagram. t0: safe condition – output current is nominal, output voltage is at the negative rail, VSS. t1: fault control reached – output current rises above the programmed fault value, CT begins to charge at ≅ 36µA. t2: max current reached – output current reaches the programmed maximum level and becomes a con- stant current with value IMAX. t3: fault occurs – CT has charged to 2.5V, fault output goes high, the FET turns off allowing no output cur- rent to flow, VOUT floats up to ground. t4: retry – CT has discharged to 0.5V, but fault current is still exceeded, CT begins charging again, FET is on, VOUT pulled down to VSS. t5: t5 = t3: illustrates 3%duty cycle. t6: t6 = t4 t7: output short circuit - if VOUT is short circuited to ground, CT charges at a higher rate depending upon the values for VSS and RPL. t8: fault occurs – output is still short circuited, but the occurrence of a fault turns the FET off so no current is conducted. t9: t9 = t4; output short circuit released, still in fault mode. t10: t10 = t0; fault released, safe condition – return to normal operaton of the circuit breaker. |
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