DS_DNK12SIP_09062016

10

FEATURES DESCRIPTIONS

Remote On/Off

The DNK series power modules have an On/Off pin for

remote On/Off operation. Only negative On/Off logic

option is available in the DNK series power modules.

For negative logic module, the On/Off pin is suggested

to be pulled high with an external pull-up resistor (see

figure 36). Negative logic On/Off signal turns the module

OFF during logic high and turns the module ON during

logic low. If the negative On/Off function is not used,

leave the pin floating or tie to GND. (module will be On)

Vo

Vin

On/Off

GND

Rpull-up

RL

I

ON/OFF

Figure 36: Negative remote On/Off implementation

Over-Current Protection

To provide protection in an output over load fault

condition, the unit is equipped with internal over-current

protection.

When

the

over-current

protection

is

triggered, the unit enters hiccup mode. The units

operate normally once the fault condition is removed.

Over-Temperature Protection

The over-temperature protection consists of circuitry

that provides protection from thermal damage. If the

temperature exceeds the over-temperature threshold

the module will shut down. The module will restart once

the temperature is within specification

Remote Sense

The DNK provide Vo remote sensing to achieve proper

regulation at the load points and reduce effects of

distribution losses on output line. In the event of an open

remote sense line, the module shall maintain local sense

regulation through an internal resistor.

FEATURES DESCRIPTIONS (CON.)

RL

Distribution Losses

Distribution Losses

Distribution Losses

Distribution Losses

Vo

Vin

GND

Sense

Figure 37: Effective circuit configuration for remote sense

operation

Output Voltage Programming

The output voltage of the DNK can be programmed to

any voltage between 0.8Vdc and 5.5Vdc by connecting

one resistor (shown as Rtrim in Figure 38) between the

TRIM and GND pins of the module. Without this external

resistor, the output voltage of the module is 0.8 Vdc. To

calculate the value of the resistor Rtrim for a particular

output voltage Vo, please use the following equation:

Rtrim

1200

Vo

0.80

−

100

−













Ω

⋅

:=

Rtrim is the external resistor in Ω

Vo is the desired output voltage

Vo

TRIM

GND

RLoad

Rtrim

Figure 38: Circuit configuration for programming output voltage

using an external resist