ISL6527EVAL2【PDF 2/8 页】EVALUATION BOARD QFN ISL6527

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AN1021

To observe the output while the regulator sinks current,

connect the positive terminal of the load to the 3.3V post

(J1). Connect the return terminal of the same load to the

V OUT post (J3).

Startup

There are two distinct start up methods for both the ISL6526

and ISL6527 regulators. The first method is invoked through

the application of power to the IC. The soft-start feature

allows for a controlled rise of the output once the Power On

Reset (POR) threshold of the input voltage has been

reached. Figure 1 shows the start up profile of the regulator

in relation to the start up of the 3.3V input supply and the

bias supply generated by the charge pump. Both the

ISL6526 and ISL6527, whether switching at 300 or 600kHz,

Shutdown

As discussed in the previous section, if the OCSET/SD pin

or ENABLE pin is pulled down and held below 0.8V, the

regulator will be turned off. The MOSFET gates are

immediately pulled low. Figure 3 shows the shutdown profile

of the regulator under full load.

V OUT

will have the same start up profile as shown in Figure 1.

V ENABLE

1V/DIV

1V/DIV

V CPVOUT

1V/DIV

20 μ s/DIV

FIGURE 3. SHUTDOWN WITH FULL LOAD (ISL6526)

V VCC

1V/DIV

V OUT

1V/DIV

2ms/DIV

FIGURE 1. START UP FROM POR

The second method of start up is through the use of the

Enable/Shutdown feature. Holding the ENABLE pin on the

ISL6526 or the OCSET/SD pin on the ISL6527 below 0.8V

ISL6527 Input Reference

A distinguishing feature of the ISL6527 is that the reference

used to regulate the output is provided from an external

source. This allows the converter to track the output of

another regulator at any desired ratio or amplify a small

signal. Figure 4 illustrates the tracking and power

amplification ability of the ISL6527 with a sinusoidal

reference. Figure 4 also illustrates the startup profile.

V REF_IN

200mV/DIV

will disable the regulator by forcing both the upper and lower

MOSFETs off. Releasing the respective pin allows the

regulator to start up. Figure 2 shows the start up profile with

this method.

V OUT

200mV/DIV

V ENABLE

1V/DIV

2ms/DIV

FIGURE 4. SMALL SIGNAL POWER AMPLIFICATION

V OUT

1V/DIV

1ms/DIV

FIGURE 2. START UP FROM SHUT DOWN

2

Ripple Voltage

Figure 5 shows the ripple voltage on the output of the

regulator. The ripple voltages shown are for both the

ISL6526 and ISL6527 ICs running at either 300 or 600kHz.

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