DESIGN CONSIDERATIONS
The NE12S0A0V(H)06 uses a single phase and voltage mode controlled buck topology. The output can be trimmed from 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
DS_NE12S06A_06302008
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
The
VEN _ RTH | = | 15.05 ⋅ (R + 6.34) | + 0.8 |
| |||
|
| 6.34 ⋅ R | |
VEN _ FTH | = VEN _ RTH − 0.3V | ||
VEN _ FTH | is the | ||
VEN _ RTH | is the | ||
R (Kohm) is the outen resistor connected from Enable pin to the GND
Enable
NE10A/6A
R
Fig. 18. UVLO setting
An active high voltage will disable the input UVLO function.
6
