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UC1856-SP Datenblatt(PDF) 10 Page - Texas Instruments

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Teilenummer UC1856-SP
Bauteilbeschribung  Improved Current-Mode PWM Controller
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UC1856-SP Datenblatt(HTML) 10 Page - Texas Instruments

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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
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