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NC12S0A0V30PRFA Datasheet(PDF) 9 Page - Delta Electronics, Inc. |
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NC12S0A0V30PRFA Datasheet(HTML) 9 Page - Delta Electronics, Inc. |
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9 / 14 page  DS_NC12S30A_09072008 9 FEATURES DESCRIPTIONS (CON.) 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 31 and the typical trim resistor values are shown in Figure 32. The output can also be set by an external voltage connected to trim pin as shown in Figure 32. The NC30A/40A module has a trim range of 0.9V to 5.0V. A plot of trim behavior is shown in Figure 33 Cout -SENSE +SENSE GROUND Rs Vout TRIM Figure 31 : Trimming Output Voltage The NC30/NC40 modules have a trim range of 0.9V to 5.0V. The trim resistor equation for the them is : Rs (kΩ) = 9 . 0 69 . 12 − − Vout Vout Vout is the desired voltage setpoint, Rs is the trim resistance between TRIM and Ground, Rs values should not be less than 1.8 kΩ Output Voltage Rs(Ω) +0.9 V OPEN +1.2 V 38.3K +1.5 V 18.7K +1.8 V 12.1K +2.5 V 6.34K +3.3 V 3.92K +5.0 V 1.87K Figure 32: Typical trim resistor values Rt Cout Vt -SENSE +SENSE GROUND Rs Vout TRIM Figure 33: Output voltage trim with voltage source To use voltage trim, the trim equation for the NC30 is (please refer to Fig. 33): 69 . 12 ) 1 ( 9 . 0 ) 69 . 12 1 . 13 ( ) ( + + − − + = Ω Rs Vout Rs Vout 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 = 1 kΩ Ω = + + − − + = Ω k Rs Vout Rs Vout Vt Rs k Rt 72 . 0 69 . 12 ) 1 ( 9 . 0 ) 69 . 12 1 . 13 ( ) ( Power Good The converter provides an open collector signal called Power Good. This output pin uses positive logic and is open collector. This power good output is able to sink 5mA and set high when the output is within ±10% of output set point. The power good signal is pulled low when output is not within ±10% of Vout or Enable is OFF. Output Capacitance There is no output capacitor on the NC series modules. Hence, an external output capacitor is required for stable operation. For NC30 modules, two external 6.3V/680μF output low ESR capacitors in parallel (for example, OSCON) are required for stable operation. It is important to places these low ESR capacitors as close to the load as possible in order to get improved dynamic response and better voltage regulation, especially when the load current is large. Several of these low ESR capacitors could be used together to further lower the ESR. Please refer to individual datasheet for the maximum allowed start-up load capacitance for each NC series as it is varied between series. |
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