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LM3478 Datasheet(PDF) 10 Page - Texas Instruments |
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LM3478 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page PWM Comparator resets the RS latch PWM Comparator Blank-Out prevents false reset 325 ns Blank-Out time Oscillator Sets the RS Latch + - 92 mV typ VIN (V) VFB (V) 7.2V OVP (1.31V) 1.26V t t LM3478 LM3478-Q1 SNVS085V – JULY 2000 – REVISED FEBRUARY 2013 www.ti.com Figure 24. The Feedback Voltage Experiences an Oscillation if the Input Voltage crosses the 7.2V Internal Bias Threshold Figure 25. Basic Operation of the PWM Comparator SLOPE COMPENSATION RAMP The LM3478 uses a current mode control scheme. The main advantages of current mode control are inherent cycle-by-cycle current limit for the switch and simpler control loop characteristics. It is also easy to parallel power stages using current mode control since current sharing is automatic. However, current mode control has an inherent instability for duty cycles greater than 50%, as shown in Figure 26. A small increase in the load current causes the switch current to increase by ΔI0. The effect of this load change is ΔI1. The two solid waveforms shown are the waveforms compared at the internal pulse width modulator, used to generate the MOSFET drive signal. The top waveform with the slope Se is the internally generated control waveform VC. The bottom waveform with slopes Sn and Sf is the sensed inductor current waveform VSEN. 10 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3478 LM3478-Q1 |
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