LM2524D, LM3524D

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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

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.

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