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UC3845 Datasheet(PDF) 1 Page - Texas Instruments |
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UC3845 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 8 page ![]() UC1842/3/4/5 UC2842/3/4/5 UC3842/3/4/5 Current Mode PWM Controller FEATURES • Optimized For Off-line And DC To DC Converters • Low Start Up Current (<1mA) • Automatic Feed Forward Compensation • Pulse-by-pulse Current Limiting • Enhanced Load Response Characteristics • Under-voltage Lockout With Hysteresis • Double Pulse Suppression • High Current Totem Pole Output • Internally Trimmed Bandgap Reference • 500khz Operation • Low RO Error Amp DESCRIPTION The UC1842/3/4/5 family of control ICs provides the necessary features to im- plement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include un- der-voltage lockout featuring start up current less than 1mA, a precision refer- ence trimmed for accuracy at the error amp 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 out- put stage, suitable for driving N Channel MOSFETs, is low in the off state. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have UVLO thresholds of 16V (on) and 10V (off), ideally suited to off-line applica- tions. The corresponding thresholds for the UC1843 and UC1845 are 8.4V and 7.6V. The UC1842 and UC1843 can operate to duty cycles approaching 100%. A range of zero to 50% is obtained by the UC1844 and UC1845 by the addition of an internal toggle flip flop which blanks the output off every other clock cycle. BLOCK DIAGRAM A/B Note 1: A = DIL-8 Pin Number. B = SO-14 Pin Number. Note 2: Toggle flip flop used only in 1844 and 1845. 4/97 |
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