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LM3524D bảng dữ liệu(PDF) 11 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM2524D/LM3524D Regulating Pulse Width Modulator
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LM2524D, LM3524D
www.ti.com
SNVS766E – JUNE 2009 – REVISED MAY 2013
Figure 15.
The amplifier's inputs have a common-mode input range of 1.5V–5.5V. The on board regulator is useful for
biasing the inputs to within this range.
Current Limiting
The function of the current limit amplifier is to override the error amplifier's output and take control of the pulse
width. The output duty cycle drops to about 25% when a current limit sense voltage of 200 mV is applied
between the +CL and −CLsense terminals. Increasing the sense voltage approximately 5% results in a 0% output
duty cycle. Care should be taken to ensure the
−0.7V to +1.0V input common-mode range is not exceeded.
In most applications, the current limit sense voltage is produced by a current through a sense resistor. The
accuracy of this measurement is limited by the accuracy of the sense resistor, and by a small offset current,
typically 100
μA, flowing from +CL to −CL.
Output Stages
The outputs of the LM3524D are NPN transistors, capable of a maximum current of 200 mA. These transistors
are driven 180° out of phase and have non-committed open collectors and emitters as shown in Figure 16.
Figure 16.
Copyright © 2009–2013, Texas Instruments Incorporated
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