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UCC1917 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC1917 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 9 page 8 UCC1917 UCC2917 UCC3917 FLTOUT R2 R1 LOCAL VDD LOCAL FAULT 13 V DD R2 R1 LOCAL VDD LOCAL FAULT 13 V DD FLTOUT 11 11 R2 R1 LOCAL VDD LOCAL FAULT 13 V DD FLTOUT 11 (A) (B) (C) Figure 6. Potential level shift circuitry to interface to FLTOUT on the UCC3917. supply voltage for the system is 25V, choose R V A k >= 25 60 416 µ Ω. The capacitor C shown on the output of this circuit is useful to filter the level shift output and prevent false triggering from noise. The minimum recommended ca- pacitor value is 100pF. Larger capacitors will result in better noise immunity and longer delay to logic com- mand. The circuit in Fig. 5B accomplished the same function as the circuit in Fig. 5A, using different components. In this circuit, select resistor R so that the transistor draws enough current to exceed the 60 µA logic threshold but doesn’t exceed the 500 µA maximum logic input current. For example, if the input circuit is 5V logic, then APPLICATION INFORMATION (cont.) SHTDWN OR LATCH R C VOUT TO UCC3917 (A) C VOUT TO UCC3917 (B) R SHTDWN OR LATCH Figure 5. Potential level shift circuitry to interface to LATCH and SHTDWN on the UDG-99148 |
Similar Part No. - UCC1917 |
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Similar Description - UCC1917 |
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