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UC1842A-SP 데이터시트(PDF) 9 Page - Texas Instruments |
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UC1842A-SP 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 30 page 7 5 4 2 1 3 8 7 6 5 V CC Gnd R T/CT V FB Comp C/S V REF 5.0 V 50 mA V C Output Pwr Ground PWM Latch 5-V REF S/R UVLO 34 V 2.5 V Osc Error Amplifier 2R R 1 V Current Sense Comparator Internal Bias V Good Logic REF S R UC1842A-SP, UC1843A-SP, UC1844A-SP www.ti.com SLUS872D – JANUARY 2009 – REVISED MAY 2015 9 Detailed Description 9.1 Overview The UC184xA-SP control IC is a pin-for-pin compatible improved version of the UC184x family. Providing the necessary features to control current-mode switched-mode power supplies, this device has the following improved features. Startup current is specified to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V. 9.2 Functional Block Diagram 9.3 Feature Description UC184xA is a current mode controller, used to support various topologies such as forward, flyback, Buck, Boost and using an external interface circuit will also support half-bridge, full bridge, and push-pull configurations. Figure 2 shows the two-loop current-mode control system in a typical buck regulator application. A clock signal initiates power pulses at a fixed frequency. The termination of each pulse occurs when an analog of the inductor current reaches a threshold established by the error signal. In this way, the error signal actually controls peak inductor current. This contrasts with conventional schemes in which the error signal directly controls pulse width without regard to inductor current. Several performance advantages result from the use of current-mode control. First, an input voltage feed-forward characteristic is achieved; that is, the control circuit instantaneously corrects for input voltage variations without using up any of the error amplifier’s dynamic range. Therefore, line regulation is excellent and the error amplifier can be dedicated to correcting for load variations exclusively. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: UC1842A-SP UC1843A-SP UC1844A-SP |
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