Inside: Showcase (Volume 29) is available in HTML and PDF format. - 330KB
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Supply controllers deliver performanceProduct features
With the onset of the digital revolution, DSPs are becoming prominent in a large number of high performance applications. The TPS56xx family of Synchronous Buck Hysteretic Regulator Controllers address the rapidly transitioning current demands associated with these applications.
This is accomplished by using a fast hysteretic controller with user adjustable hysteresis that responds within 250 ns of any change in load requirements to dramatically reduce overshoot and undershoot caused by the load transients. A resistor divider internally sets the output voltage with an accuracy of ±1 percent over the full operating temperature range. Overcurrent shutdown and crossover protection are provided for the output drivers to eliminate the possibility of destructive faults in the output FETs. The output voltage is monitored to provide a Power Good signal and overvoltage protections. Power Good will go low if the output voltage drops below 93 percent of nominal, and the output drivers will be latched off if the output voltage rises 15 percent above nominal. Additionally, the TPS56xx family has inhibit and undervoltage lockout features to assure that the 12-V supply voltage and the system supply voltage (5 V or 3.3 V) are within proper operating range before the controller starts. The controller includes 2-A rated drivers and an internal 8-V drive regulator that can easily provide sufficient power for high-performing DSPs. Output voltages available include 1.5 V (TPS5615), 1.8 V (TPS5618), 2.5 V (TPS5625) and 3.3 V (TPS5633). The TPS56xx family is available in a 28-pin TSSOP PowerPad package. An EVM with a reference design is available.
Vol 29 November, 1998 |
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