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UC2847 Datasheet(PDF) 8 Page - Texas Instruments |
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UC2847 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 24 page 15 10 9 8 OSC 3 4 + X3 + + 5 6 + E/A 7 COMP INV NI C/S+ C/S- CT RT SYNC VIN 5.1-V REFERENCE REGULATOR UVLO LOCKOUT 2 VREF 13 11 VC A OUT 14 12 B OUT GND Q Q T S S R Q 1 + 16 6 k: 0.5 mA 350 mV 0.5 V F/F CURRENT LIMIT ADJUST SHUTDOWN UC1846 Output Stage UC1847 Output Inverted COMP UC1846, UC1847, UC2846 UC2847, UC3846, UC3847 SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015 www.ti.com 7 Detailed Description 7.1 Overview The UCx846/7 family of control devices provides the necessary features to implement off-line or DC-to-DC fixed- frequency, current-mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start-up current less than 1 mA, a precision reference trimmed for accuracy at the error amplifier input, logic to insure latched operation, a PWM comparator which 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 either N-Channel MOSFETs or bipolar transistor switches, is low in the off state. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Current Sense Amplifier The current sense amplifier may be used in a variety of ways to sense peak switch current for comparison with an error voltage. Referring to Functional Block Diagram, maximum swing on the inverting input of the PWM comparator is limited to approximately 3.5 V by the internal regulated supply. Accordingly, for a fixed gain of 3, maximum differential voltages must be kept below 1.2 V at the current sense inputs. 8 Submit Documentation Feedback Copyright © 1997–2015, Texas Instruments Incorporated Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847 |
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