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UCC3916 Datasheet(PDF) 3 Page - Texas Instruments |
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UCC3916 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 3 page 3 UCC3916 PIN DESCRIPTIONS CT: A capacitor is applied between this pin and ground to set the maximum fault time. The maximum fault time must be more than the time to charge external capaci- tance. The maximum fault time is defined as: TFAULT= 28 • 10 3 • CT. Once the fault time is reached the output will shutdown for a time given by: TSD = 1 • 10 6 • CT this results in a 3% duty cycle. 0.1 µF is recommended for SCSI applications to achieve the normal maximum capacitance on the Termpwr line. SHTDWN: The IC enters a low-power sleep mode when this pin is low and exits the sleep mode when this pin is high. VIN: Input voltage to the circuit breaker, ranging from 4V to 6V. VOUT: Output voltage of the circuit breaker. When switched, the output voltage is approximately: VOUT = VIN – (220m Ω) • IOUT. UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 FAX (603) 424-3460 5 1 8 4 2 3 6 7 UCC3916 VIN SHTDWN GND GND GND GND CT OUTPUT C T C LOAD C IN V IN TERMPOWER BUS D1 TYPICAL APPLICATION UDG-99169 Protecting The UCC3916 From Voltage Transients The parasitic inductance associated with the power dis- tribution can cause a voltage spike at VIN if the load cur- rent is suddenly interrupted by the UCC3916. It is important to limit the peak of this spike to less than 6V to prevent damage to the UCC3916. This voltage spike can be minimized by: • Reducing the power distribution inductance (e.g., twist the positive (+) and negative (–) leads of the power supply feeding VIN pin, locate the power supply close to the UCC3916 or use a PCB ground plane). • Decoupling VIN with a capacitor, CIN, located close to the VIN. This capacitor is typically less than 1µF to limit the inrush current. • Clamping the voltage at VIN below 6V with a Zener diode, D1, located close to the VIN pin. SAFETY RECOMMENDATIONS Although the UCC3916 is designed to provide system protection for all fault conditions, all integrated circuits can ultimately fail short. For this reason, if the UCC3916 is intended for use in safety critical applications where UL © or some other safety rating is required, a redundant safety device such as a fuse should be placed in series with the device. The UCC3916 will prevent the fuse from blowing virtually all fault conditions, increasing system reliability and reducing maintainence cost, in addition to providing the hot swap benefits of the device. APPLICATION INFORMATION |
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