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DP8110 10A DC-DC Intelligent dPOL Data Sheet

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

BCD.00262 Rev. 1.0, 12 FEB 2013

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Page 21 of 34

7.5.8.3

Front End and Crowbar

If an error is propagated to at least the Group level,

the DPM can also be configured to generate

commands to turn off a front end (a DC-DC

converter generating the intermediate bus voltage)

and to trigger an optional crowbar protection to

accelerate removal of the IBV voltage.

7.5.8.4

Propagation Process

Understanding Fault and Error propagation is easier

with the following examples.

The First example is of of non-propagation from a

dPOL, as shown in Figure 35. An undervoltage error

shuts down the Vo, but since propagation was not

enabled, OK-A is not pulled down and Vo2 stays up.

Figure 35. No Group Fault Propagation

Figure 36 shows a scope capture an actual system

when undervoltage error detection is set to not

propagate.

In this example, the dPOL connected to scope Ch 1

encounters the undervoltage fault after turn-on.

Because fault propagation is not enabled for this

POL, it alone turns off and generates the UV fault

signal. Because a UV fault triggers the sequenced

turn-off, the dPOL meets its turn-off delay and falling

slew rate settings during the turn-off process as

shown in the trace for Ch1. Since the UV fault is

programmed to be non-latching, the dPOL will

attempt to restart every 130 ms, repeating the

process described above until the condition causing

the undervoltage is removed. The 130ms hiccup

interval is guaranteed regardless of the turn-off delay

setting.

Figure 36. Turn-On into UVP on V3. The UV Fault Is

Programmed To Be Non-Latching. Ch1 – Vo1, Ch2 –

Vo2(Group A), Ch3 – Vo3 (Group B) Vo4 not shown.

The next example is intra-group propagation, the

dPOL propagates its fault or error events. Here fault

propagation between POLs is enabled.

In Figure 37 the dPOL powering output Vo1 again

encounters an undervoltage error. It pulls its OK line

low. Since the dPOL powering output Vo2 (Ch3 in

the picture) belongs to the same group (A in this

case), pulling down OK-A tells that dPOL to execute

a regular turn-off.

Figure 37 Intra Group Fault Propagation

Since both Vo1 and Vo2 have the same delay and

slew rate settings they will continue to turn off and on

synchronously every 130ms as shown in Figure 38

until the condition causing the undervoltage is

removed.

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