전자부품 데이터시트 검색엔진 |
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LM2734Z 데이터시트(PDF) 7 Page - Texas Instruments |
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LM2734Z 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 32 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 www.ti.com SNVS334E – JANUARY 2005 – REVISED APRIL 2013 Figure 9. LM2734Z Waveforms of SW Pin Voltage and Inductor Current BOOST FUNCTION Capacitor CBOOST and diode D2 in Figure 10 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 1.6V greater than VSW. Although the LM2734Z will operate with this minimum voltage, it may not have sufficient gate drive to supply large values of output current. Therefore, it is recommended that VBOOST be greater than 2.5V above VSW for best efficiency. VBOOST – VSW should not exceed the maximum operating limit of 5.5V. 5.5V > VBOOST – VSW > 2.5V for best performance. Figure 10. VOUT Charges CBOOST When the LM2734Z starts up, internal circuitry from the BOOST pin supplies a maximum of 20mA to CBOOST. This current charges CBOOST to a voltage sufficient to turn the switch on. The BOOST pin will continue to source current to CBOOST until the voltage at the feedback pin is greater than 0.76V. There are various methods to derive VBOOST: 1. From the input voltage (VIN) 2. From the output voltage (VOUT) 3. From an external distributed voltage rail (VEXT) 4. From a shunt or series zener diode Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2734Z |
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유사한 설명 - LM2734Z_15 |
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