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UC1856-SP датащи(PDF) 8 Page - Texas Instruments

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номер детали UC1856-SP
подробное описание детали  Improved Current-Mode PWM Controller
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1856-SP датащи(HTML) 8 Page - Texas Instruments

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UC1856-SP
SLUSBV6 – APRIL 2014
www.ti.com
8 Detailed Description
8.1 Overview
The UC1856 is a high-performance version of the popular UC1846 series of current-mode controllers, and is
intended for both design upgrades and new applications where speed and accuracy are important. All input-to-
output delays have been minimized, and the current sense output is slew-rate limited to reduce noise sensitivity.
Fast 1.5-A peak output stages have been added to allow rapid switching of power FETs.
8.2 Functional Block Diagram
8.3 Feature Description
UC1856 is a current mode controller, used to support various topologies such as forward, flyback, half-bridge, full
bridge, push-pull configurations.
Current mode control is a two-loop system. The switching power supply inductor is hidden within the inner
current control loop. This simplifies the design of the outer voltage control loop and improves power supply
performance in many ways, including better dynamics. The objective of this inner loop is to control the state-
space averaged inductor current, but in practice the instantaneous peak inductor current is the basis for control
(switch current - equal to inductor current during the on time - is often sensed). If the inductor ripple current is
small, peak inductor current control is nearly equivalent to average inductor current control.
The peak method of inductor current control functions by comparing the upslope of inductor current (or switch
current) to a current program level set by the outer loop. The comparator turns the power switch off when the
instantaneous current reaches the desired level. The current ramp is usually quite small compared to the
programming level, especially when VIN is low. As a result, this method is extremely susceptible to noise. A noise
spike is generated each time the switch turns on. A fraction of a volt coupled into the control circuit can cause it
to turn off immediately, resulting in a sub-harmonic operating mode with much greater ripple. Circuit layout and
bypassing are critically important to successful operation.
8
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Product Folder Links: UC1856-SP


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