ISL6271AEVAL1 データシートの表示（PDF） - Intersil

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ISL6271AEVAL1

Setup Instructions for the ISL6271A Evaluation Kit

Intersil 

Setup Instructions for the ISL6271A Evaluation Kit

Transient Load Testing w/onboard Transient Generator

The onboard transient generator function permits dynamically changing the load current on Vcore and is enabled by

placing a shunt across H4 pins 2-3 (while H1 is enabled), see Figure 1. This periodically connects and disconnects a

5 ohm load across the Vcore output at about a 1 second interval, corresponding to about a 250mA pulse load on the

output at 1.3V. H4 pin 2 can then be used to trigger the scope and observe the effect on Vcore each time this load

switches in either the positive or negative direction, thus observing the transient response of the Vcore regulator. This

is illustrated below in Figure 9 with a 10mA external load bias applied. (Note: The output load can be biased to some

DC level by an external load connected through J3) . A programmable external load may provide more versatility for

transient load testing, but this on-board capability gives an excellent read on the regulators response characteristic.

Vcore

H4-Pin2

FIGURE 9. VCORE TRANSIENT RESPONSE (10MA – 250MA)

Efficiency Measurement Considerations

Since the ISL6271A is a multi-regulator PMIC, it is important to segregate the regulators as much as possible when

attempting accurate efficiency measurements on the core regulator. The power input to the LDOs (LVCC) can be tied

to the main PVCC input by a strap on H2, but should be separated from the core regulator input voltage (PVCC)

during efficiency measurements. All other extraneous draw from PVCC should be removed, such as the LED power

and the transient generator circuitry. Removing the shunt from H1 effectively removes power from both the LED and

transient-generator circuits, and prepares the circuit for core regulator efficiency measurements.

Another drain to take into consideration, if efficiency testing is being done under static VID control, is the 100K pull-up

resistors for the switches in S1, which will drain 30-40uA each from PVCC when in the ‘right’ position. If testing is

being done at an output voltage of less than 1.3V (all ‘left’), then the number of switches in the ‘right’ position should

be factored into the efficiency calculation. This should be a relatively insignificant factor at higher output current

levels, but it is a factor to be cognizant of.

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