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UC2914DWTRG4 датащи(PDF) 8 Page - Texas Instruments |
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UC2914DWTRG4 датащи(HTML) 8 Page - Texas Instruments |
8 / 24 page UC2914 UC3914 SLUS425C − DECEMBER 2003 − REVISED JULY 2004 8 www.ti.com APPLICATION INFORMATION Analysis of the application circuit shows that VIMAX (with respect to GND) can be defined as: V IMAX + VREF ) V CC * VREF R1 R1 ) R2 + 2V R1 R1 ) R2 ) V REF where D VREF is the voltage on the REF pin, an internally generated potential 2-V below VCC The UC3914 also has an internal overcurrent comparator which monitors the voltage between SENSE and VCC. If this voltage exceeds 50 mV, the comparator determines that a fault has occurred, and a timing capacitor, CT, begins to charge. This can be rewritten as a current which causes a fault, IFAULT: I FAULT + 50 mV R SENSE FAULT TIMING Figure 2 shows the circuitry associated with the fault timing function of the UC3914. A typical fault mode, where the overload comparator and current source I3 do not factor into operation (switch S2 is open), is first considered. Once the voltage across RSENSE exceeds 50 mV, a fault has occurred. This causes the timing capacitor, CT, to charge with a combination of 100 µA (I1) plus the current from the power limiting circuitry (IPL). UDG−03158 2 17 VCC SENSE 12 14 15 VOUTS PLIM CT + S1 S2 + + + 0.5 V SQ Q R FAULT LATCH H=CLOSE H=CLOSE RPL RSENSE To LOAD CT 50 mV VCC VCC 103 µA 3 mA 2.5 V 0.2 V IMAX SENSE To Output Drive H=OFF Reset Comparator I2 3 µA Fault Comparator IPL To Output Overload Comparator To VCC I1 I3 Figure 2. Fault Timing Circuitry Including Power Limit and Overcurrent (5) (6) |
Аналогичный номер детали - UC2914DWTRG4 |
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Аналогичное описание - UC2914DWTRG4 |
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