MAX17595 datasheet(4/9 Pages) MAXIM

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MAX17595 Evaluation Kit

Evaluates: MAX17595 as Flyback Converter

Maxim Integrated

EN/UVLO and OVI PCB pads are available for monitoring

the voltages present at the respective inputs.

Soft-Start

The EV kit provides an option to configure the circuit

soft-start. Capacitor C7 configures the soft-start time (tSS)

to 12ms. To reconfigure the soft-start time to a different

value, use the following equation to choose a new C7

capacitor:

× SS

C7 8.2645 t

where tSS is in ms and C7 is in nF.

Switching Frequency

The EV kit switching frequency is set to 120kHz by resistor

R9. To configure the IC’s switching frequency to a differ-

ent value, between 100kHz and 1MHz, use the following

equation to choose a new R9 resistor:

Ω

where fSW is in Hz and R9 is in I.

Frequency Dithering

The EV kit switching frequency can be dithered in a range

of Q10% to reduce EMI. There are two specifications for

the frequency dithering: the frequency (how often) of

dithering and the amount (how much) of dithering.

Capacitor C2 configures the dither frequency using the

following equation:

DITHER

50µA

3.2V f

where fDITHER is in Hz and C2 is in farads, and the dither

frequency (fDITHER) is recommended to be set close to

1kHz.

Resistors R9 and R10 configure the amount of dithering

in percentage (%) of the switching frequency using the

following equation:

%DITHER

R11

The EV kit is shipped with the frequency dithering dis-

abled and the DITHER /SYNC pin shorted to SGND by a

0I resistor installed on the C2 footprint. To set the

desired frequency dither, replace capacitor C2 and

install resistor R11 with the appropriate values. The

DITHER /SYNC PCB pad is available for monitoring the

signal at the DITHER/SYNC pin.

MAX17595 Datasheet(PDF) 4 Page - Maxim Integrated Products

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