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UCC3915DPTR Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3915DPTR Datasheet(HTML) 5 Page - Texas Instruments |
5 / 15 page UCC2915, UCC3915 15V PROGRAMMABLE HOT SWAP POWER MANAGER SLUS198C – FEBUARY 2000 - REVISED - JUNE 2001 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 pin descriptions B0 – B3: These pins provide digital input to the DAC, which sets the fault-current threshold. They can be used to provide a digital soft-start and adaptive-current limiting. CT: A capacitor connected to ground sets the maximum-fault time. The maximum-fault time must be more than the time required to charge the external capacitance in one cycle. The maximum-fault time is defined as TFAULT = 16.1 × 103 × CT. Once the fault time is reached the output will shutdown for a time given by TSD = 833 × 103 × CT, this equates to a 1.9% duty cycle. FAULT: Open-drain output, which pulls low upon any fault or interrupt condition, or thermal shutdown. IMAX: When this pin is set to a logic low, the maximum-sourcing current will always be 1 A above the programmed-fault level. When set to a logic high, the maximum-sourcing current will be a constant 4 A for applications which require fast charging of load capacitance. SHTDWN: When this pin is brought to a logic low, the IC is put into a sleep mode drawing typically less than 100 µA of ICC.The input threshold is hysteretic, allowing the user to program a startup delay with an external RC circuit. VIN: Input voltage to the UCC3915. The recommended voltage range is 7 V to 15 V. Both VIN pins should be connected together and connected to the power source. VOUT: Output voltage from the UCC3915. Both VOUT pins should be connected together and connected to the load. When switched the output voltage will be approximately VIN – (0.15 Ω × IOUT). VOUT must not exceed VIN by greater than 0.3 V. APPLICATION INFORMATION UDG-99175 6 7 8 9 11 10 B0 B1 B2 B3 IMAX 16 3 2 4 12 13 5 14 15 1 SHTDWN VOUT VIN FAULT CT GND HEAT SINK GND PINS UCC3915 RL COUT VOUT CSD RSD VIN CIN D1 CT S1 S2 S3 S4 S5 DIP SWITCH S6 VIN VIN R1 LED 5 V Figure 1. Evaluation Circuit |
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