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UC2914 датащи(PDF) 1 Page - Texas Instruments |
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UC2914 датащи(HTML) 1 Page - Texas Instruments |
1 / 24 page UC2914 UC3914 SLUS425C − DECEMBER 2003 − REVISED JULY 2004 5V to 35V HOT SWAP POWER MANAGER 1 www.ti.com FEATURES D 5-V to 35-V Operation D Precision Maximum Current Control D Precision Fault Threshold D Programmable Average Power Limiting D Programmable Overcurrent Limit D Shutdown Control D Charge Pump for Low RDS(on) High-Side Drive D Latch Reset Function Available D Output Drive VGS Clamping D Fault Output Indication D 18-Pin DIL and SOIC Packages SIMPLIFIED APPLICATION DIAGRAM DESCRIPTION The UC3914 family of hot swap power managers provides complete power management, hot swap and fault handling capability. Integrating this part and a few external components, allows a board to be swapped in or out upon failure or system modification without removing power to the hardware, while maintaining the integrity of the powered system. Complementary output drivers and diodes have been integrated for use with external capacitors as a charge pump to ensure sufficient gate drive to the external N-channel MOSFET transistor for low RDS(on). All control and housekeeping functions are integrated and externally programmable and include the fault current level, maximum output sourcing current, maximum fault time and average power limiting of the external FET. The UC3914 features a duty ratio current limiting technique, which provides peak load capability while limiting the average power dissipation of the external pass transistor during fault conditions. The fault level is fixed at 50 mV with respect to VCC to minimize total dropout. The fault current level is set with an external current sense resistor. The maximum allowable sourcing current is programmed by using a resistor divider from VCC to REF to set the voltage on IMAX. The maximum current level, when the output appears as a current source is (VVCC − VIMAX)/RSENSE. This part is offered in both 18-pin DW wide-body (SOIC) and dual-in-line (DIL) packages. PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. Copyright 2003, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. UDG−03114 SD FAULT VOUT VOUT 1 5 7 4 18 16 2 17 REF IMAX VCC SENSE PMPB OSCB VPUMP 10 1 GND 11 12 14 15 OUT VOUTS PLIM CT 13 LR 9 PMP 6 OSC UC2914/UC3914 VCC VCC |
Аналогичный номер детали - UC2914 |
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Аналогичное описание - UC2914 |
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