MAX15112EVKIT データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX15112EVKIT

MAX15112 Evaluation Kit Evaluates: MAX15112

Maxim Integrated 

MAX15112 Evaluation Kit

Evaluates: MAX15112

When no external reference is applied at SS/REFIN, the

device uses the internal 0.6V reference. An external

tracking reference with steady-state value between 0

and VIN - 2.5V can be applied to SS/REFIN. Refer to the

Setting the Soft-Start Time section of the MAX15112 IC

data sheet for a more detailed description. During 1ms

hiccup timeout, the SS/REFIN pin is pulled to GND inter-

nally to discharge the soft-start capacitor. R6 limits the

currents from an externally supplied reference during the

1ms hiccup timeout event.

Setting the Output Voltage

The EV kit can be adjusted from 0.6V up to 0.94 x VIN

(forced PWM) by changing the values of resistors R1 and

R2. To determine the value of the resistor-divider, first

select R2 between 1kI and 20kI. Then use the following

equation to calculate R1:

R1 = R2 [(VOUT/VFB) - 1]

where VFB is equal to the reference voltage at SS/REFIN

and VOUT is the desired output. If no external reference is

applied at SS/REFIN the internal reference is automatically

selected and VFB becomes 0.6V. When regulating for an

output of 0.6V in skip mode, set R1 to 0I and keep R2

connected from FB to GND.

When R1 is changed, compensation components C14,

R1, and C15 must be changed to ensure loop stability

(refer to the Compensation Design Guidelines section in

the MAX15112 IC data sheet).

Regulator Enable (EN)

The device features a regulator enable input. For normal

operation, a shunt should be installed on jumper JU1.

To disable the output, remove the shunt on JU1 and the

EN pin will be pulled to PGND through resistor R4. See

Table 1 for JU1 settings.

Skip-Mode Input (SKIP)

The device offers selectable skip-mode functionality

to reduce current consumption and achieve a higher

efficiency at light loads. To operate in skip mode, install

a shunt on pins 1-2 on jumper JU2. See Table 2 for JU2

settings. Caution: Do not change the setting of the

skip jumper while the device is operating.

Table 1. Regulator Enable (EN) Jumper JU1 Description

SHUNT POSITION

Installed*

Not installed

*Default position.

EN PIN

Connected to IN

Pulled to PGND through R4

Table 2. Skip-Mode Input (SKIP) Jumper JU2 Description

SHUNT POSITION

1-2

2-3*

*Default position.

SKIP PIN

Connected to EN

Connected to PGND

DEVICE OUTPUT

Enabled

Disabled

MODE

Skip-mode operation

Forced-PWM operation

Maxim Integrated

  3

Share Link: