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NC12S0A0V20NNFA Datasheet(PDF) 8 Page - Delta Electronics, Inc. |
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NC12S0A0V20NNFA Datasheet(HTML) 8 Page - Delta Electronics, Inc. |
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8 / 14 page  DS_NC12S20A_12092010 8 FEATURES DESCRIPTIONS 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 7.0V to 8.0V. Over-Current and Short-Circuit Protection The NC 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 high-side MOSFET. 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. Please see the electrical characteristics for details of the OCP function. The detection of the Rds(on) of the high side MOSFET also acts as an over temperature protection since high temperature will cause the Rds(on) of the MOSFET to increase, eventually triggering over-current protection. Output Voltage Programming The output voltage of the NC series is trimmable by connecting an external resistor between the trim pin and output ground as shown Figure 27 and the typical trim resistor values are shown in Figure 28. The output can also be set by an external voltage connected to trim pin as shown in Figure 29. NC6A/15A/20A Rs Vout Ground Trim Enable Ground Vin Figure 27: Trimming Output Voltage The NC15A/20A module has a trim range of 0.9V to 5.0V. The trim resistor equation for the NC6A/NC15A/ NC20A is : 9 . 0 1170 ) ( − = Ω Vout Rs Vout is the output voltage setpoint Rs is the resistance between Trim and Ground Rs values should not be less than 280Ω Output Voltage Rs (Ω) +0.9 V OPEN +1.2 V 3.92K +1.5 V 1.96K +1.8 V 1.3K +2.5 V 732 +3.3 V 487 +5.0 V 287 Figure 28: Typical trim resistor values NC6A/15A/20A Vout Ground Trim Enable Ground Vin 1.3K Rt Rs Vt Figure 29: Output voltage trim with voltage source To use voltage trim, the trim equation for the NC6A/NC15A/ NC20A is (please refer to Fig. 29) : ) 9 . 0 ( 17 . 1 ) 17 . 1 3 . 1 ( ) ( − − − = Ω Vout Rs Vt Rs k Rt Vout is the desired output voltage Vt is the external trim voltage Rs is the resistance between Trim and Ground (in KΩ) Rt is the resistor to be defined with the trim voltage (in KΩ) Below is an example about using this voltage trim equation : Example： If Vt = 1.25V, desired Vout = 2.5V and Rs = 0.715KΩ Ω = − − − = Ω K Vout Rs Vt Rs K Rt 51 . 12 ) 9 . 0 ( 17 . 1 ) 17 . 1 3 . 1 ( ) ( |
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