DS_NE12S10A_07092013

6

FEATURES DESCRIPTIONS

Enable (On/Off)

The ENABLE (on/off) input allows external circuitry to

put the NE converter into a low power dissipation (sleep)

mode. Positive ENABLE is available as standard. With

the active high function, the output is guaranteed to turn

on if the ENABLE pin is driven above 0.8V. The output

will turn off if the ENABLE pin voltage is pulled below

0.3V.

Undervoltage Lockout

The ENABLE pin is also used as input UVLO function.

Leaving the enable floating, the module will turn on if the

input voltage is higher than the turn-on threshold and

turn off if the input voltage is lower than the turn-off

300mV hysteresis.

The turn-on voltage may be adjusted with a resistor

placed between the

“Enable” pin and “Ground” pin. The

equation for calculating the value of this resistor is:





8

.

0

34

.

6

34

.

6

05

.

15

_











R

R

V

RTH

EN

V

V

V

RTH

EN

FTH

EN

3

.

0

_

_





NE10A/6A

R

Enable

Fig. 18. UVLO setting

FTH

EN

V

_

is the turn-off threshold

RTH

EN

V

_

is the turn-on threshold

R (Kohm) is the outen resistor connected from Enable

pin to the GND

An active high voltage will disable the input UVLO

function.

DESIGN CONSIDERATIONS

The NE10 is a single phase and voltage mode controlled

Buck topology. The output can be trimmed in the range

of 0.59Vdc to 5.1Vdc by a resistor from Trim pin to

Ground.

The converter can be turned ON/OFF by remote control

with positive on/off (ENABLE pin) logic. The converter

DC output is disabled when the signal is driven low

(below 0.3V). This pin is also used as the input turn on

threshold judgment. Its voltage is percent of Input

voltage during floating due to internal connection. So we

do not suggest using an active high signal (higher than

0.8V) to turn on the module because this high level

voltage will disable UVLO function. The module will turn

on when this pin is floating and the input voltage is

higher than the threshold.

The converter can protect itself by entering hiccup mode

against over current and short circuit condition. Also, the

converter will shut down when an over voltage protection

is detected.

Safety Considerations

It is recommended that the user to provide a very

fast-acting type fuse in the input line for safety. The

output voltage set-point and the output current in the

application could define the amperage rating of the fuse.