Power: Telecom DC/DC Module: Digital

Block diagram (SBD) Telecom DC/DC Module using TI’s Digital Controllers, high performance drivers and transceivers.


The challenges faced by Telecom DC/DC power supply developers today include achieving high efficiency, high integration, low system cost, ease of development, and product differentiation. Power topologies such as 2-switch forward, half bridge, and full bridge are commonly employed in today's designs to addressing these needs. In addition, OEMs are demanding additional features such as more sophisticated fault diagnosis, power measurement, and more extensive status reporting over I2C or CAN interface.

Digital controllers offer the obvious advantages of combining PWM control and additional features, reducing part count and reducing BOM cost. Meanwhile they can implement different compensation schemes under different conditions, making it possible to achieve improved transient response and high efficiency across line and load ranges. This can be as simple as using different parameters and throttling back on PWM frequency or switching to a different compensation such as feed forward on sudden line or load change. Another advantage of digital controllers is the possibility of different versions of firmware for different product offerings based on the same h/w reducing the time and investment associated with making h/w changes.

Digital controllers rely on a fast on-chip ADC to sample and convert the currents and voltages, on fast CPU to execute the compensation and update the control or PWM duty, and on flexible PWM module to generate the PWM patterns for different power topologies. They also rely on extra CPU bandwidth and additional peripherals for system supervisory and communication tasks. On-chip analog comparators closely coupled into the PWM generation are also commonly seen peripherals to help save CPU bandwidth and increase loop bandwidth. High PWM resolution is required for high PWM switching frequency which is critically important in today's designs.

Digital controllers rely on executing software code to perform control and system supervisory functions. So, robust code development and debugging tools are critical.

The High performance UCD7XXX FET Driver family features high speed, high current, and fast over-current protection. It is designed to directly interface with digital controllers. TI's UCC27xxx drivers are also used with digital controllers.

TI's Integrated Hot Swap Power Controllers are optimized for nominal -48V systems. The devices provide load current slew rate control and peak magnitude limiting. Most of the Hot Swap Controllers have digital interface for precise programming and monitoring and also have Power good and fault outputs.

Other high-performance analog parts are also available to provide critical system functions and features such as sensor feedback, isolation, communication transceivers.

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Title Abstract Type Size (MB) Date Views
PDF 1.53 MB 18 May 2011 358

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