Datenblatt-Suchmaschine für elektronische Bauteile |
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LM2736X Datenblatt(PDF) 8 Page - Texas Instruments |
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LM2736X Datenblatt(HTML) 8 Page - Texas Instruments |
8 / 31 page 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 LM2736 SNVS316F – SEPTEMBER 2004 – REVISED APRIL 2013 www.ti.com Figure 20. LM2736 Waveforms of SW Pin Voltage and Inductor Current BOOST FUNCTION Capacitor CBOOST and diode D2 in Figure 21 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 LM2736 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 21. VOUT Charges CBOOST When the LM2736 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 1.18V. 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 In the Simplifed Block Diagram of Figure 19, capacitor CBOOST and diode D2 supply the gate-drive current for the NMOS switch. Capacitor CBOOST is charged via diode D2 by VIN. During a normal switching cycle, when the internal NMOS control switch is off (TOFF) (refer to Figure 20), VBOOST equals VIN minus the forward voltage of D2 (VFD2), during which the current in the inductor (L) forward biases the Schottky diode D1 (VFD1). Therefore the voltage stored across CBOOST is VBOOST - VSW = VIN - VFD2 + VFD1 (1) 8 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LM2736 |
Ähnliche Teilenummer - LM2736X |
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Ähnliche Beschreibung - LM2736X |
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