поискавой системы для электроныых деталей |
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UC2914DWTR датащи(PDF) 7 Page - Texas Instruments |
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UC2914DWTR датащи(HTML) 7 Page - Texas Instruments |
7 / 24 page UC2914 UC3914 SLUS425C − DECEMBER 2003 − REVISED JULY 2004 7 www.ti.com APPLICATION INFORMATION The UC3914 is to be used in conjunction with external passive components and an N-channel MOSFET to facilitate hot swap capability of application modules. A typical application setup is given in Figure 1. UDG−98194 14 12 11 17 2 10 4 5 9 18 1 8 7 16 6 15 13 + − VPUMP PLIM VOUTS OUT + − + − + − + − + − S Q QR T + − CT LR GND VPUMP PMPB OSCB PMP OSC R1 R2 C1 C2 SENSE VCC IMAX REF CP1 VCC − 2 V Reference 250 kHz Oscillator 200 mV 50 mV Overload Comparator Overcurrent Comparator RPL To VOUT RSENSE VFAULT = 50 mV Undervoltage Lockout 4.0 V/ 3.8 V To Linear Amplifier VOUT + 10 V (45 VMAX) CP2 CPUMP To VOUT To VCC RFAULT FAULT SD VCC 15 V To Linear Amplifier VCC CT Fault Latch Fault Timing Circuitry H = Close H = Close Toggle 1.4 V 0.5 V 2.5 V 3 mA 103 µA VCC VCC 3 µA Q Q Figure 1. Typical Application The term hot swap refers to the system requirement that submodules be swapped in or out upon failure or system modification without removing power to the operating hardware. The integrity of the power bus must not be compromised due to the addition of an unpowered module. Significant power bus glitches can occur due to the substantial initial charging current of on-board module bypass capacitance and other load conditions (for more information on hot swapping and power management applications, see SLUA157). The UC3914 provides protection by monitoring and controlling the output current of an external N-channel MOSFET to charge this capacitance and provide load current. The addition of the N-channel MOSFET, a sense resistor, RSENSE, and two other resistors, R1 and R2, sets the programmed maximum current level the N-channel MOSFET can source to charge the load in a controlled manner. The equation for this current, IMAX, is: I MAX + V VCC * VIMAX R SENSE where D VIMAX is the voltage generated at the IMAX pin (4) |
Аналогичный номер детали - UC2914DWTR |
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Аналогичное описание - UC2914DWTR |
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