Isolated power controllers boost efficiency, reliability
By integrating multiple functions such as overvoltage protection (OVP), output tracking, and light load mode for greater energy efficiency and SR Drivers, which otherwise need several discrete components, ADI says that board space is reduced by up to 35% and system reliability improved when compared to traditional approaches using optocouplers. The PWM controllers are designed for isolated DC/DC power supplies for use in universal input off-line, industrial, or telecom power supplies. Secondary side communication using PGOOD eliminates typical isolation barrier constraints while reducing external component count.
These devices offer a combination of a primary and secondary side controller with iCoupler isolation technology in a single package with true secondary side sensing, providing benefits of primary and secondary side controllers in one combination. iCoupler technology also provides high bandwidth for transient response with over five times improvement and reduced output capacitance.
The ADP1071-1 and ADP1071-2 are PWM current mode fixed frequency synchronous flyback controllers designed for isolated DC/DC power supplies. Integrated iCoupler technology eliminates signal transformers and optocouplers. With the integrated isolation and drivers on both the primary and secondary side, the PWM controllers offer a compact system level design that yields higher efficiency than a diode-rectified flyback converter at heavy loads. The ADP1071-1 accommodates high voltage applications (≥60V) and the ADP1071-2 accommodates low voltage applications (≤60V). The ADP1071-1 and ADP1071-2 are suited for isolated DC/DC or AC/DC power conversion, small cell, PoE powered devices, and enterprise switches/routers used in telecom and industrial applications.
The ADP1074 is a current mode fixed frequency active-clamp synchronous forward controller also designed for isolated DC/DC power supplies, again using iCoupler technology. With the integrated isolators and MOSFET drivers on both the primary and secondary side, the ADP1074 offers a compact system-level design and yields a higher efficiency than a non-synchronous forward converter at heavy loads. The ADP1074 is suited for isolated DC/DC power conversion in many applications including intermediate bus voltage generation, base station and antenna RF power, small cell, PoE powered devices, enterprise switches/routers, core/edge/metro/optical routing, and power modules used in telecom and industrial equipment.