The Design Of A Resonant Mode PWM Power Management Chip

With the rapid development of electronic technology, electronic equipment have more and more types, and higher and higher power requirements, power is lighter, thinner, smaller and more efficient for the development. The traditional linear voltage-stabilized source already could not satisfy the request. But switching power supply in use time has a higher efficiency and the flexibility compared to the linear power source.This design is a resonant PWM power supply managment chip. Paper first introduces the related basic theory of switching power supply, Based on these paper has designed this power supply management chip system structure and various modular circuit. It also includes a precision voltage reference, a wide-bandwidth error amplifier, a variable frequency oscillator operable to beyond 3MHz, an oscillator-triggered one-shot, dual high-current totem-pole output driver, and a programmable toggle flip-flop. The output mode is easily programmed for various sequences such as A, off, B, off; A & B, off; or A, B, off. The device also contains an uncommitted comparator, a fast comparator for fault sensing, programmable soft start circuitry, and a programmable restart delay. In addition, it contains programmable under voltage lockout circuitry that forces the output stages low and minimizes supply current during start-up conditions.In this paper, the system structure and function chips, each module circuit structure and function is analyzed and the results indicated that can meet the design requirements of the index, achieves the desired design goal.