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DNT12S0A0R05NFA Datasheet(PDF) 7 Page - Delta Electronics, Inc. |
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DNT12S0A0R05NFA Datasheet(HTML) 7 Page - Delta Electronics, Inc. |
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7 / 12 page  DS_DNT12SMD03_06252007 7 FEATURES DESCRIPTIONS Remote On/Off The DNT series power modules have an On/Off pin for remote On/Off operation. Both positive and negative On/Off logic options are available in the DNT series power modules. For positive logic module, connect an open collector (NPN) transistor or open drain (N channel) MOSFET between the On/Off pin and the GND pin (see figure 22). Positive logic On/Off signal turns the module ON during the logic high and turns the module OFF during the logic low. When the positive On/Off function is not used, leave the pin floating or tie to Vin (module will be On). For negative logic module, the On/Off pin is pulled high with an external pull-up resistor (see figure 23) 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) RL Vo Vin On/Off GND I ON/OFF Figure 22: Positive remote On/Off implementation Vo Vin On/Off GND Rpull-up RL I ON/OFF Figure 23: 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. FEATURES DESCRIPTIONS (CON.) Output Voltage Programming The output voltage of the DNT can be programmed to any voltage between 0.75Vdc and 5.5Vdc by connecting one resistor (shown as Rtrim in Figure 25) between the TRIM and GND pins of the module. Without this external resistor, the output voltage of the module is 0.7525 Vdc. To calculate the value of the resistor Rtrim for a particular output voltage Vo, please use the following equation: Rtrim 10500 2.5475 1000 − ⎛⎜ ⎝ ⎞ ⎠ Ω ⋅ := Rtrim = 3.122 kΩ DNT can also be programmed by applying a voltage between the TRIM and GND pins (Figure 26). The following equation can be used to determine the value of Vtrim needed for a desired output voltage Vo: Vtrim 0.7 Vo 0.7525 − ( ) 0.0667 ⋅ ⎡⎣ ⎤⎦ − := Vtrim is the external voltage in V Vo is the desired output voltage For example, to program the output voltage of a DNT module to 3.3 Vdc, Vtrim is calculated as follows Vtrim 0.7 2.5475 0.0667 ⋅ ( ) − := Rtrim 10500 Vo 0.7525 − 1000 − ⎛⎜ ⎝ ⎞ ⎠ Ω ⋅ := Rtrim is the external resistor in Ω Vo is the desired output voltage For example, to program the output voltage of the DNT module to 3.3Vdc, Rtrim is calculated as follows: |
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