MAX17558 datasheet(4/14 Pages) MAXIM

4 / 14 page

Maxim Integrated │ 4

www.maximintegrated.com

Evaluates: MAX17558

MAX17558 Evaluation Kit

Switching Frequency

The device’s switching frequency is set to 350kHz by

resistor R14. Replace R14 with another value to set the

switching frequency between 100kHz to 2200kHz. Use

the following equation to calculate R14 when reconfiguring

the switching frequency:

133)

8.8

Where FSW is in kHz and R14 is in KΩ.

When reconfiguring the EV kit’s switching frequency,

it may be necessary to change the loop-compensation

network’s components to new values. Refer to the “Loop

Compensation” section in the MAX17558 IC data sheet

for computing new compensation component values.

Power-Good Outputs

The EV kit provides power-good output test points

(PGOOD1 and PGOOD2) to monitor the PGOOD1 and

PGOOD2 signals. The PGOOD signals are pulled-up to

VCCINT by R21 and R20. PGOOD1 and PGOOD2 are

high when VOUT1 and VOUT2, respectively, are within the

90%-110% range of their programmed output voltages.

When VOUT1 and VOUT2 are outside of the 90%-110%

range of their programmed output voltages, PGOOD1 and

PGOOD are pulled low, respectively.

Power Supply Tracking

The EV kit is set up for independent soft-start without

tracking. The EV kit outputs are also operated in tracking

mode, with either output as a master by the following

modifications.

For OUT2 to track OUT1, follow the steps below:

● Replace R23 with a 0Ω resistor

● Replace R22 and C30 with a resistive divider such

that the parallel combination of the divider resistors

is less than 10kΩ. The ratios of the resistor-dividers

should be identical to the ratios of R26, R27, R6, and

R7 for the coincident tracking and ratiometric track-

ing, respectively.

For OUT1 to track OUT2, follow the steps below:

● Replace R30 with a 0Ω resistor

● Replace R29 and C21 with a resistive-divider such

that the parallel combination of the divider resistors

is less than 10kΩ. The ratios of the divider resistors

should be identical to the ratios of R6, R7 and R26,

R27 for the coincident tracking and ratiometric tracking,

respectively.

MAX17558 Datasheet(PDF) 4 Page - Maxim Integrated Products

MAX17558 Datasheet(HTML) 4 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Datasheet Download

Link URL