ZL6105ALAF datasheet(24/35 Pages) INTERSIL

24 / 35 page

ZL6105

FN6906.5

December 19, 2013

Output Overcurrent Protection

The ZL6105 can protect the power supply from damage if the

output is shorted to ground or if an overload condition is imposed

on the output. Once the current limit threshold has been selected

(see “Current Limit Threshold Selection” on page 19), the user

may determine the desired course of action in response to the

fault condition. The following overcurrent protection response

options are available:

1. Initiate a shutdown and attempt to restart an infinite number

of times with a preset delay period between attempts.

2. Initiate a shutdown and attempt to restart a preset number of

times with a preset delay period between attempts.

3. Continue operating for a given delay period, followed by

shutdown if the fault still exists.

4. Continue operating through the fault (this could result in

permanent damage to the power supply).

5. Initiate an immediate shutdown.

The default response from an overcurrent fault is an immediate

shutdown of the device. The device will continuously check for

the presence of the fault condition, and if the fault condition no

longer exists the device will be re-enabled.

Please refer to Application Note AN2033 for details on how to

select specific overcurrent fault response options via I2C/SMBus.

Thermal Overload Protection

The ZL6105 includes an on-chip thermal sensor that

continuously measures the internal temperature of the die and

shuts down the device when the temperature exceeds the preset

limit. The default temperature limit is set to +125°C in the

factory, but the user may set the limit to a different value if

desired. See Application Note AN2033 for details. Note that

setting a higher thermal limit via the I2C/SMBus interface may

result in permanent damage to the device. Once the device has

been disabled due to an internal temperature fault, the user may

select one of several fault response options as follows:

1. Initiate a shutdown and attempt to restart an infinite number

of times with a preset delay period between attempts.

2. Initiate a shutdown and attempt to restart a preset number of

times with a preset delay period between attempts.

3. Continue operating for a given delay period, followed by

shutdown if the fault still exists.

4. Continue operating through the fault (this could result in

permanent damage to the power supply).

5. Initiate an immediate shutdown.

If the user has configured the device to restart, the device will

wait the preset delay period (if configured to do so) and will then

check the device temperature. If the temperature has dropped

below a threshold that is approximately +15°C lower than the

selected temperature fault limit, the device will attempt to re-

start. If the temperature still exceeds the fault limit the device

will wait the preset delay period and retry again.

The default response from a temperature fault is an immediate

shutdown of the device. The device will continuously check for

the fault condition, and once the fault has cleared the ZL6105

will be re-enabled.

Please refer to Application Note AN2033 for details on how to select

specific temperature fault response options via I2C/SMBus.

Voltage Tracking

Numerous high performance systems place stringent demands

on the order in which the power supply voltages are turned on.

This is particularly true when powering FPGAs, ASICs, and other

advanced processor devices that require multiple supply voltages

to power a single die. In most cases, the I/O interface operates at

a higher voltage than the core and therefore the core supply

voltage must not exceed the I/O supply voltage according to the

manufacturers' specifications.

Voltage tracking protects these sensitive ICs by limiting the

differential voltage between multiple power supplies during the

power-up and power down sequence. The ZL6105 integrates a

lossless tracking scheme that allows its output to track a voltage

that is applied to the VTRK pin with no external components

required. The VTRK pin is an analog input that, when tracking

mode is enabled, configures the voltage applied to the VTRK pin

to act as a reference for the device’s output regulation.

The ZL6105 offers two modes of tracking as follows:

1. Coincident. This mode configures the ZL6105 to ramp its

output voltage at the same rate as the voltage applied to the

VTRK pin.

FIGURE 14. OUTPUT RESPONSES TO PRE-BIAS VOLTAGES

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