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TPIC74101QPWPRQ1 Datasheet(PDF) 7 Page - Texas Instruments |
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TPIC74101QPWPRQ1 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 32 page I OUT D * D 2 Upper: Lower: V =2.5V× (driver) R1+R2 R1 V =2.3V× (driver) R1+R2 R1 . TPIC74101-Q1 www.ti.com SLIS140 – OCTOBER 2011 PRINCIPLES OF OPERATION Functional Principle The TPIC74101-Q1 is a buck/boost switch-mode regulator that operates in a power-supply concept to ensure a stable output voltage with input voltage excursions and specified load range. The device provides an alarm indicator and reset output to interface with systems that require supervisory function. The switching regulator offers a clock modulator and a current-mode slew-rate control for the internal switching transistor (Q1) to minimize EMI. An internal low-rDS(on) switch has a current-limit feature to prevent inadvertent reset when turning on the 5Vg output. Description of the Functional Terminals Switch-Mode Input/Output Terminals (L1, L2) The external inductor for the switch-mode regulator is connected between terminals L1 and L2. This inductor is placed close to the terminals to minimize parasitic effects. For stability, an inductor with 20 μH to 100 μH should be used. Supply Terminal (Vdriver) The input voltage of the device is connected to the Vdriver terminal. This input line requires a filter capacitor to minimize noise. A low-ESR aluminum or tantalum input capacitor is recommended. The relevant parameters for the input capacitor are the voltage rating and RMS current rating. The voltage rating should be approximately 1.5 times the maximum applied voltage for an aluminum capacitor and 2 times for a tantalum capacitor. In buck mode, the RMS current is , where D is the duty cycle and its maximum RMS current value is reached when D = 50% with IRMS = IOUT/2. In boost mode, the RMS current is 0.3 × ΔI, where ΔI is the peak-to-peak ripple current in the inductor. To achieve this, ESR ceramic capacitors are used in parallel with the aluminum or tantalum capacitors. Internal Supply Decoupling Terminal (Vlogic) The Vlogic terminal is used to decouple the internal power-supply noise by use of a 470-nF capacitor. This terminal can also be used as an output supply for the logic-level inputs for this device (SCR0, SCR1, ENABLE, CLP, and 5Vg_ENABLE). Input Voltage Monitoring Terminal (AIN) The AIN terminal is used to program the threshold voltage for monitoring and detecting undervoltage conditions on the input supply. A maximum of 40 V may be applied to this terminal and the voltage at this terminal may exceed the V(driver) input voltage without effecting the device operation. The resistor divider network is programmed to set the undervoltage detection threshold on this terminal (see the application schematic). The input has a typical hysteresis of 200 mV with a typical upper limit threshold of 2.5 V and a typical lower limit threshold of 2.3 V. When V(AIN) falls below 2.3 V, V(AOUT) is asserted low; when V(AIN) exceeds 2.5 V, V(AOUT) is in the high-impedance state. The equations to set the upper and lower thresholds of V(AIN) are: (1) Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): TPIC74101-Q1 |
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