UC2844AQ Datasheet PDF

UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ CURRENT-MODE PWM CONTROLLER D Extended Temperature Performance of –40°C to 125°C D Optimized for Off-line and DC to DC Converters D Low Start Up Current (<0.5 mA) D Trimmed Oscillator Discharge Current D Automatic Feed Forward Compensation D Pulse-by-Pulse Current Limiting D Enhanced Load Response Characteristics D Under-Voltage Lockout With Hysteresis D Double Pulse Suppression D High Current Totem Pole Output D Internally Trimmed Bandgap Reference D 500 kHz Operation D Low RO Error Amp description SGLS164 – APRIL 2003 D 8-PIN PACKAGE (TOP VIEW) COMP VFB ISENSE RT/CT 1 2 3 4 8 VREF 7 VCC 6 OUTPUT 5 GND D 14-PIN PACKAGE (TOP VIEW) COMP NC VFB NC ISENSE NC RT/CT 1 2 3 4 5 6 7 14 VREF 13 NC 12 VCC 11 VC 10 OUTPUT 9 GND 8 PWR GND The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features.