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UC1856-SP Datenblatt(PDF) 10 Page - Texas Instruments |
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UC1856-SP Datenblatt(HTML) 10 Page - Texas Instruments |
10 / 24 page UC1856-SP SLUSBV6 – APRIL 2014 www.ti.com Feature Description (continued) 8.3.3 Slope Compensation For duty cycle above 50% slope compensating can be implemented by using a buffer (i.e. 2N2222) and connecting base to timing capacitor pin 8 , collector to VREF (5 V), a resistor in series with emitter connected to (pin 4) CS+ of differential current sense amplifier. Injecting a downslope proportional to the sawtooth into current sense amplifier. As with any bipolar PWM IC, outputs should be protected from negatively biasing the substrate. This is typically done by using Schottky diodes from ground to each output. Failure to do this could cause spurious interruption and restart of the oscillator, dropping of output pulses and a significant increase in propagation delays. 8.3.4 Error Amplifier UC1856-SP incorporates an error amplifier with typical open loop gain of 100 db and gain bandwidth of 1.5 MHz. With Source and sink capability of 10 mA and 0.5 mA respectively. Error amplifier sources up to 0.5 mA. Figure 3. Error Amplifier Output Configuration 8.3.5 Current Sense Amplifier UC1856-SP incorporates a differential current sense amplifier which can eliminate ground loop problems and increase noise immunity. An R-C snubber can also be implemented thus helping in blanking the peak current spike when the switch is turned on. The input of the current sense amplifier is slew rate limited allowing lower values of filter capacitors to be used to eliminate leading edge noise. Figure 4. Current-Sense Amplifier Connections In some applications, a small RC filter is required to reduce switch transients. Differential input allows remote noise sensing. 8.3.6 Current Limit Over current trip point is determined by Equation 1. Differential current sense amplifier has a gain of three, as shown in Figure 5. 10 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: UC1856-SP |
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