概览
描述
The ISL6726EVAL2Z evaluation board is a 24V input to 12V output DC/DC converter that can output current up to 7.5A. It is implemented with Renesas' ISL6726 active clamp forward (ACF) current-mode PWM controller. The board demonstrates fundamental functions of the ISL6726, including soft-start/soft-stop, peak current protection, average current protection, slope compensation, flux limit, minimum duty ratio clamp, etc. The circuit operates at fixed frequency with peak current mode control. The converter adopts ACF and synchronous rectifier to obtain high efficiency. Typical efficiency is about 92% at full load.
The ISL6726 is a highly featured single-ended PWM controller intended for applications using the active clamp forward converter topology in either N- or P-Channel active clamp configurations, the asymmetric half-bridge topology, and the standard forward topologies with synchronous rectification. It is a current-mode PWM controller that features a precision oscillator which allows accurate control of the deadtime and maximum duty cycle, bidirectional synchronization with 180° phase shift for interleaving applications, adjustable soft-start and soft-stop, a low power disable mode, and average current limit for "brick-wall" overcurrent protection.
特性
- Precision maximum duty cycle and deadtime control
- 125μA typical start-up current
- Adjustable peak and average current limit protection
- Programmable oscillator frequency
- Bidirectional synchronization with 180° phase shift for interleaved converter applications
- Adjustable soft-start and selectable soft-stop
- Selectable minimum duty cycle clamp for synchronous rectifier applications
- Programmable slope compensation
- Supports N- and P-Channel active clamp FETs
- Programmable switch timing between main and active clamp outputs
- Programmable undervoltage lock-out (UV)
- Input voltage dependent duty cycle clamp
- Enable input with low power disable
- Internal over-temperature protection
- Pb-free (RoHS compliant)
