MIK3845A

MIK3842A, MIK3843A MIK3844A, MIK3845A CURRENT MODE PWM CONTROLLER Description MIK3842A, MIK3843A, MIK3844A and MIK3845A are high performance with fixed frequency current mode PWM controllers. They are specially designed for off-Line and DC-to-DC converter applications with minimum external components. These devices feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem pole output which is suitable for driving MOSFETs. The under voltage lock-out (U.V.L.O.) is designed to operated with 0.17mA typ. start-up current, allowing an efficient bootstrap supply voltage design. The U.V.L.O. thresholds for the MIK3842A/44A are 16V (on) and 10V (off) which are ideal for off-line applications. The corresponding typical threshold for the MIK3843A/45A is 8.4V (on) and 7.6V (off). The MIK3842A/43A can operated within 100% duty cycle and the MIK3844A/45A can operated within 50% duty cycle. Features  Low Start-Up and Operating Current  Automatic Feed Forward Compensation  Current Mode Operating Frequency up to 500KHz  Trimmed Oscillator Discharge Current for Precise Duty Cycle Control  Latching PWM for Cycle-By-Cycle Current Limiting  Under Voltage Lockout with Hysteresis  High Current totem Pole Output Stage Available Options Device Start-UP Hysteresis Voltage MIK3842A MIK3843A MIK3844A MIK3845A 16V 8.4V 16V 8.4V 6V 0.8V 6V 0.8V Max. Duty Cycle < 100% < 100...