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Old 8th April 2008, 05:07 AM   #1
hollowman is offline hollowman  United States
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Default “Ideal” power/regulation for higher-current digital-section ICs

For various power applications, some like shunts, others like series.

What might the ideal PS and regulator topologies be for power- (current-) hungry ICs like…

Philips SAA7210 (demod/decoder):
Vdd = 5V
Idd = 200mA

Philips SAA7220 (oversampler, aka digital filter):
Vdd (pin 24) = 5V
Idd (pin 24) = 180mA

Pacific Microsonics PMD-100 (oversampler, aka digital filter):
Vdd = 5V
Idd = 110mA (max)
Pdd = 550 mW (max)

Philips TDA1541A (DAC chip):
Vdd = 5V
Idd = 45mA
Vdd1 = -5V
Idd1 = 45mA
Vdd2 = -15V
Idd2 = 25mA

I would like to try CCS+shunt regulators for the above ICs. But the high-noise Zeners, often used in “higher”-current CCS+shunt regs I've seen, have me a bit concerned. For digital-section ICs, some folks use TL431s (instead of Zeners) in their CCS+shunt regs. However, these folks are powering chips that comparatively eat very little current/power (e.g. TDA1545 Idd=3.0mA, etc.).

All this noted, would a “super regulator”, like Jung or ALW, be a better choice for the above ICs?
If, in your opinion, each IC (or, even, indiv. supply inputs of a single IC, such as TDA1541) is best optimized by a specific PS/reg topology, then please state that and which one.

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