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DP8105 5A DC-DC Intelligent dPOL Data Sheet

8V to 14V Input •••• 0.7V to 5.5V Output

BCD.00261 Rev. 1.0, 12 Feb 2013

www.power-one.com

Page 15 of 35

Figure 21. Tracking Turn-On. Rising Slew Rate is

Programmed at 0.5V/ms for each output.

Figure 22. Turn-On with Different Rising Slew Rates.

Rising Slew Rates are V1-1V/ms, V2-0.5V/ms, V3-0.2V/ms.

Figure 23. Sequenced Turn-On. Rising Slew Rate is

Programmed at 1V/ms. V2 Delay is 2ms, V3 delay is 4ms.

Figure 24 Two outputs delayed 5ms. All slew rates at 0.5V/ms.

7.3.2.1

Pre-Bias

In some applications, power may "leak" from a

powered circuit to an unpowered bus, typically

through ESD protection

diodes. The dPWER

controller in the DP8105 holds off turn on its output

until the desired ramp up point crosses the pre-bias

point, as seen in Figure 25.

Figure 25. Turn On into Prebiased Load. V3 is Prebiased by

V2 via a Diode.

This figure was captured with an actual system

where a diode was added to pre-bias a 1.5V bus

from a 1.85V bus in order to simulate the effect of

current

leakage

through

protection

circuits

unpowered logic connected to powered logic outputs

(a common source of pre-bias in power systems).

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