ON UC2845BD1R2G

Step-Up, Step-Up/Step-DownBoost, Flyback7,6 В ~ 30 В

Overview

DESCRIPTIONThe UC384xB family of control ICs provides the necessary to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, 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 the offstate.   ■ TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL■ OSCILLATOR FREQUENCY GUARANTEED AT 250kHz■ CURRENT MODE OPERATION TO 500kHz■ AUTOMATIC FEED FORWARD COMPENSATION■ LATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITING■ INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT■ HIGH CURRENT TOTEM POLE OUTPUT■ UNDERVOLTAGE LOCKOUT WITH HYSTERESIS■ LOW START-UP AND OPERATING CURRENT   

Features

Applications

• Servo drive system
• Digital display device
• Linear guide
• Ball screw pair
• Computer application technology
• Network technology
• Automation technology
• CMM
• Various precision measuring instruments
• Various precision measuring detectors