UC1843-SP

UC1843-SP www.ti.com QML CLASS V, CURRENT-MODE PWM CONTROLLER Check for Samples: UC1843-SP SLUS981 – MARCH 2010 FEATURES 1 QML-V Qualified, SMD 5962-86704 Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free) (1) Controlled Baseline Optimized For Off-line and DC-to-DC Converters Low Start-Up Current (<1 mA) 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 500-kHz Operation Low RO Error Amp xxx (1) Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/sec. Radiation Lot Acceptance Testing is available - contact factory for details. JG PACKAGE (TOP VIEW) COMP V FB I SENSE R /C TT 1 2 3 4 8V REF 7V CC 6 OUTPUT 5 GROUND DESCRIPTION The UC1843 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 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 output stage, suitable for driving N-Channel MOSFETs, is low in th...