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NC12S0A0V40PNFA Datasheet(PDF) 10 Page - Delta Electronics, Inc. |
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NC12S0A0V40PNFA Datasheet(HTML) 10 Page - Delta Electronics, Inc. |
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10 / 14 page  DS_NC12S40A_02072007 10 FEATURES DESCRIPTIONS (CON.) Voltage Margining Output voltage margining can be implemented in the NC30/NC40 modules by connecting a resistor, R margin-up, from the Trim pin to the ground pin for margining up the output voltage. Also, the output voltage can be adjusted lower by connecting a resistor, Rmargin-down, from the Trim pin to the output pin. Figure 34 shows the circuit configuration for output voltage margining adjustment. THERMAL CONSIDERATION Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat transfer. Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. Thermal Testing Setup Delta’s DC/DC power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encountered in most electronics equipment. This type of equipment commonly uses vertically mounted circuit cards in cabinet racks in which the power modules are mounted. The following figure shows the wind tunnel characterization setup. The power module is mounted on a test PWB and is vertically positioned within the wind tunnel. Thermal Derating Heat can be removed by increasing airflow over the module. To enhance system reliability, the power module should always be operated below the maximum operating temperature. If the temperature exceeds the maximum module temperature, reliability of the unit may be affected. The maximum acceptable temperature measured at the thermal reference point is 125℃. This is shown in Figure 36 &41. Cout Rmargin-down 0 Vt -SENSE Rmargin-up +SENSE GROUND Rs Vout TRIM Figure 34: Circuit configuration for output voltage margining Reflected Ripple Current and Output Ripple and Noise Measurement The measurement set-up outlined in Figure 35 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on NC series converters. Cs=270uF*1 Ltest=1.4uH Cin=270uF*2 Cout=680uF*3 Figure 35 : Input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for NC40 |
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