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LM2734YQMK/NOPB bảng dữ liệu(PDF) 8 Page - Texas Instruments |
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LM2734YQMK/NOPB bảng dữ liệu(HTML) 8 Page - Texas Instruments |
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8 / 36 page  LM2734 BOOST SW GND L D1 D2 COUT CBOOST VOUT CIN VIN VIN VBOOST 0 0 VIN VD TON t t Inductor Current D = TON/TSW VSW TOFF TSW IL IPK SW Voltage LM2734Z, LM2734Z-Q1 SNVS334F – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com Feature Description (continued) regulator and compared to the output of the error amplifier, which is proportional to the difference between the feedback voltage and VREF. When the PWM comparator output goes high, the output switch turns off until the next switching cycle begins. During the switch OFF-time, inductor current discharges through Schottky diode D1, which forces the SW pin to swing below ground by the forward voltage (VD) of the catch diode. The regulator loop adjusts the duty cycle (D) to maintain a constant output voltage. Figure 7. LM2734Z Waveforms of SW Pin Voltage and Inductor Current 7.3.2 Boost Function Capacitor CBOOST and diode D2 in Figure 8 are used to generate a voltage VBOOST. VBOOST - VSW is the gate drive voltage to the internal NMOS control switch. To properly drive the internal NMOS switch during its ON-time, VBOOST needs to be at least 1.6 V greater than VSW. Although the LM2734Z operates with this minimum voltage, it may not have sufficient gate drive to supply large values of output current. Therefore, TI recommends that VBOOST be greater than 2.5 V above VSW for best efficiency. VBOOST – VSW must not exceed the maximum operating limit of 5.5 V. 5.5 V > VBOOST – VSW > 2.5 V for best performance. Figure 8. VOUT Charges CBOOST When the LM2734Z starts up, internal circuitry from the BOOST pin supplies a maximum of 20 mA to CBOOST. This current charges CBOOST to a voltage sufficient to turn the switch on. The BOOST pin continues to source current to CBOOST until the voltage at the feedback pin is greater than 0.76 V. 8 Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2734Z LM2734Z-Q1 |
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