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UC2845 Fiches technique(PDF) 1 Page - STMicroelectronics |
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UC2845 Fiches technique(HTML) 1 Page - STMicroelectronics |
1 / 11 page UC2842/3/4/5 UC3842/3/4/5 October 1998 CURRENT MODE PWM CONTROLLER . OPTIMIZED FOR OFF-LINE AND DC TO DC CONVERTERS . LOW START-UP CURRENT (< 1 mA) . AUTOMATIC FEED FORWARD COMPENSA- TION . PULSE-BY-PULSE CURRENT LIMITING . ENHANCED LOAD RESPONSE CHARAC- TERISTICS . UNDER-VOLTAGE LOCKOUT WITH HYSTER- ESIS . DOUBLE PULSE SUPPRESSION . HIGH CURRENT TOTEM POLE OUTPUT . INTERNALLY TRIMMED BANDGAP REFER- ENCE . 500 KHz OPERATION . LOW RO ERROR AMP DESCRIPTION The UC3842/3/4/5family of control ICs provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internallyimple- mentedcircuits include undervoltagelockout featur- ing start-up current less than 1 mA, a precision ref- erence trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM compara- torwhich also providescurrent limit control,and a to- tem pole output stage designed to source or sink high peak current. The output 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 UC3842 and UC3844 have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843 and UC3845 are 8.5 V and 7.9 V. The UC3842 and UC3843 can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC3844 and UC3845 by the additionof an internal toggle flip flop which blanks the output off every other clock cycle. BLOCK DIAGRAM (toggle flip flop used only in U3844 and UC3845) Minidip SO14 ® 1/11 |
Numéro de pièce similaire - UC2845 |
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Description similaire - UC2845 |
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