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UC2843DG4 데이터시트(PDF) 11 Page - Texas Instruments |
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UC2843DG4 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 56 page UCx842 UCx843 34 V 5-V Reference EN VREF Good Logic Internal Bias UVLO Osc S R PWM Latch R 1 V + E/A VCC GROUND RT/CT VFB COMP ISENSE PWM Comparator VREF OUTPUT VC PWRGND 2R 2.5 V Copyright © 2016, Texas Instruments Incorporated 11 UC1842, UC2842, UC3842, UC1843, UC2843, UC3843 UC1844, UC2844, UC3844, UC1845, UC2845, UC3845 www.ti.com SLUS223D – APRIL 1997 – REVISED AUGUST 2016 Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845 UC2845 UC3845 Submit Documentation Feedback Copyright © 1997–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The UCx84x series of control integrated circuits provide the features necessary to implement AC-DC or DC-to- DC fixed-frequency current-mode control schemes with a minimum number of external components. Protection circuitry includes undervoltage lockout (UVLO) and current limiting. Internally implemented circuits include a start-up current of less than 1 mA, a precision reference trimmed for accuracy at the error amplifier input, logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off-state. Major differences between members of these series are the UVLO thresholds, acceptable ambient temperature range, and maximum duty-cycle. Typical UVLO thresholds of 16 V (ON) and 10 V (OFF) on the UCx842 and UCx844 devices make them ideally suited to off-line AC-DC applications. The corresponding typical thresholds for the UCx843 and UCx845 devices are 8.4 V (ON) and 7.6 V (OFF), making them ideal for use with regulated input voltages used in DC-DC applications. The UCx842 and UCx843 devices operate to duty cycles approaching 100%. The UCx844 and UCx845 obtain a duty-cycle range of 0% to 50% by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle. The UC184x-series devices are characterized for operation from –55°C to 125°C. UC284x-series devices are characterized for operation from −40°C to 85°C. The UC384x devices are characterized for operation from 0°C to 70°C. 8.2 Functional Block Diagrams Figure 11. UCx842 and UCx843 Block Diagram, No Toggle |
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