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Table 2 lists switching dc/dc step-down converters with desirable features for broadcasting applications.
| Supplier | Device | Vin (V) |
Vout (min) (V) |
Iout |
Output Voltage Ripple (mVpp) |
Switching Frequency |
Freq Synch |
Power Seq |
Soft Start |
Power Good |
| Intersil |
ISL8206M Power module |
1 to 20 | 0.6 | 6 | 8 | 600 kHz | No | No | Yes | No |
| On Semi |
NCP1592 Switcher with integrated FETs |
3 to 6 | 0.891 | 6 | 10 | 280 kHz to 700 kHz | Yes | No | Yes | Yes |
| TI |
TPS54620 Switcher with integrated FETs |
4.5 to 17 | 0.8 | 6 | 33 (per EVM) | 200 kHz to 1.6 MHz | Yes | Yes | Yes | Yes |
| TI |
TPS84621 Power module |
2.95 to 14.5 | 0.6 | 6 | 30 | 250 kHz to 780 kHz | Yes | Yes | Yes | Yes |
If board space is at a premium, consider the modern power management solutions that integrate the switching DC/DC converter and post-regulation linear regulator into a single, small package. One such example is the TPS54120 from TI. Introduced only a little over a year ago in 2012, this device combines a high-efficiency switching DC/DC converter with a low-noise, high PSRR low-dropout linear regulator to support 1-A, noise-sensitive applications. The TPS54120 also includes switching frequency synchronization, soft-start, and power-good indication in a space-saving 3.5-mm x 5.5-mm thermally-enhanced QFN package.
In summary, power supply noise reduction is a complex subject. Part of a good power distribution system design is in choosing the right voltage regulators, the considerations of which have been mentioned. However, keep in mind that there are other important factors that are beyond the scope of this article, including proper bypassing, decoupling, damping, PCB layout, and much more. Thankfully, the internet is a great resource for additional information on these topics.
Landa writes from Dallas, TX. She holds a BSEE, and has 18 years experience in the electronics industry, from tech startups to Fortune 500 companies.
