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UC3844ADTR Scheda tecnica(PDF) 9 Page - Texas Instruments |
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UC3844ADTR Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 45 page S(max) S 1 V I R ´ VREF 5 V VC OUTPUT GND PWM Latch Current Sense Comparator 1 V R 2R Error Amp ISENSE COMP FB RT/CT GND VCC 34 V 2.5 V UVLO + – T S R VREF Good Logic Internal Bias 5 V REF S/R OSC Copyright © 2016, Texas Instruments Incorporated 9 UC1842A, UC1843A, UC1844A, UC1845A UC2842A, UC2843A, UC2844A, UC2845A UC3842A, UC3843A, UC3844A, UC3845A www.ti.com SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016 Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A UC3843A UC3844A UC3845A Submit Documentation Feedback Copyright © 1994–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The UCx84xA family of fixed-frequency pulse-width-modulator (PWM) controllers are designed to operate at switching frequencies of 500 kHz. These controllers are designed for peak current mode (PCM) and can be used in isolated and non-isolated power supply designs. These controllers can drive FETs directly from the output, which is capable of sourcing and sinking up to 1 A of gate driver current. These devices also have a built-in low- impedance amplifier that can be used in non-isolated designs to control the power supply output voltage and feedback loop. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Pulse-by-Pulse Current Limiting Pulse-by-pulse limiting is inherent in the current mode control scheme. An upper limit on the peak current can be established by simply clamping the error voltage. Accurate current limiting allows optimization of magnetic and power semiconductor elements while ensuring reliable supply operation. 8.3.2 Current Sense Circuit Peak current (IS) is determined by Equation 1: (1) A small RC filter may be required to suppress switch transients. |
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