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NC12S0A0V03PNFA Datasheet(PDF) 8 Page - Delta Electronics, Inc. |
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NC12S0A0V03PNFA Datasheet(HTML) 8 Page - Delta Electronics, Inc. |
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8 / 13 page  DS_NE12S03A_10032008 8 FEATURES DESCRIPTIONS (CON.) The ENABLE input can be driven in a variety of ways as shown in Figures 26 and 27. If the ENABLE signal comes from the primary side of the circuit, the ENABLE can be driven through either a bipolar signal transistor (Figure 26).If the enable signal comes from the secondary side, then an opto-coupler or other isolation devices must be used to bring the signal across the voltage isolation (please see Figure 27). ND6A/10A Vout Ground Trim Enable Ground Vin Figure 26: Enable Input drive circuit for NE series Ground Ground ND 6A/10A Vin Vout Trim Enable Figure 27 : Enable input drive circuit example with isolation. Input Under-Voltage Lockout The input under-voltage lockout prevents the converter from being damaged while operating when the input voltage is too low. The lockout occurs between 2.7V to 3.0V. Over-Current and Short-Circuit Protection The NE series modules have non-latching over-current and short-circuit protection circuitry. When over current condition occurs, the module goes into the non-latching hiccup mode. When the over-current condition is removed, the module will resume normal operation. An over current condition is detected by measuring the voltage drop across the MOSFETs. The voltage drop across the MOSFET is also a function of the MOSFET’s Rds(on). Rds(on) is affected by temperature, therefore ambient temperature will affect the current limit inception point. The detection of the Rds(on) of MOSFETs also acts as an over temperature protection since high temperature will cause the Rds(on) of the MOSFETs to increase, eventually triggering over-current protection. Output Voltage Programming The output voltage of the NE series is trimmable by connecting an external resistor between the trim pin and output ground as shown Figure 28 and the typical trim resistor values are shown in Figure 29 Vin Vout Enable Ground Ground Trim ND 6A/10A Rs Figure 28: Trimming Output Voltage The NE03 module has a trim range of 0.59V to 5.0V. The trim resistor equation for the NE03A is : 591 . 0 1182 ) ( − = Ω Vout Rs Vout is the output voltage setpoint Rs is the resistance between Trim and Ground Rs values should not be less than 268Ω Output Voltage Rs (Ω) 0.59V open +0.9 V 3.82k +1.8 V 978 +2.5 V 619 +3.3 V 436 +5.0V 268 Figure 29: Typical trim resistor values The relationship between input voltage and output voltage shown as Figure 30 Vout Vin 0.59V 0.9V 1.8V 2.5V 3.3V 5.0V 3.3V Y Y Y Y N N 5.0V Y Y Y Y Y N 8.0V Y Y Y Y Y Y 12V Y Y Y Y Y Y Figure 30: Relationship between Vin VS Vout NE3A NE3A NE3A |
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