FEATURES High efficiency: 92.5% @ 12Vin, 5V/3A out Size: Vertical: 9.4x15.5x6.6 mm (0.37”x0.61”x0.26”) Horizontal: 9.4x15.5x7.9mm (0.37”x0.61”x0.31”) Wide input range: 3.1V~13.8V Output voltage programmable from 0.59Vdc to 5.0Vdc via external resistors No minimum load required Fixed frequency operation Input UVLO, output OCP Remote ON/OFF (Positive, 5 pin version) ISO 9001, TL 9000, ISO 14001, QS9000, OHSAS18001 certified manufacturing facility UL/cUL 60950-1 (US & Canada), and TUV (EN60950-1) - pending Delphi NE Series Non-Isolated Point of Load DC/DC Modules: 3.1~13.8Vin, 0.59V-5.1Vout, 3Aout The Delphi NE 3A Series, 3.1~13.8V wide input, wide trim single output, non-isolated point of load (POL) DC/DC converters are the latest offering from a world leader in power systems technology and manufacturing — Delta Electronics, Inc. The NE product family is the second generation, non-isolated point-of-load DC/DC power modules which cut the module size by almost 50% in most of the cases compared to the first generation NC series POL modules. The NE 3A product family provides an ultra wide input range to support 3.3V, 5V, 8V, 9.6V, and 12V bus voltage point-of-load applications and it offers up to 3A of output current in a vertically or horizontally mounted through-hole miniature package and the output can be resistor trimmed from 0.59Vdc to 5.0Vdc. It provides a very cost effective, high efficiency, and high density point of load solution. With creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions. PRELIMINARY DATASHEET DS_NE12S03A_10032008 OPTIONS Vertical or horizontal versions APPLICATIONS DataCom Distributed power architectures Servers and workstations LAN / WAN applications Data processing applications TECHNICAL SPECIFICATIONS (Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.) PARAMETER NOTES and CONDITIONS NE12S0A0V/H03 Min. ABSOLUTE MAXIMUM RATINGS Input Voltage Operating Temperature (Vertical) Operating Temperature (Horizontal) Storage Temperature Opeation Refer to Fig.34 for the measuring point Refer to Fig.42 for the measuring point Enable Voltage When Vin<5V When Vin>5V INPUT CHARACTERISTICS Operating Input Voltage Input UVLO Turn On Threshold Input UVLO Turn Off Threshold Input UVLO Hysteresis Maximum Input Current Off Converter Input Current No-Load Input Current Input Reflected-Ripple External Current Input Voltage Rejection Input Voltage Variation Inrush current OUTPUT CHARACTERISTICS Output Voltage Adjustment Range Output Voltage Set Point Output Voltage Load Regulation Output Voltage Line Regulation Output Voltage Temperature Regulation Total output range Output Voltage Ripple and Noise Peak-to-Peak Peak-to-Peak Peak-to-Peak Peak-to-Peak Peak-to-Peak Peak-to-Peak RMS Output Current Range Output Voltage Over-shoot at Start-up Output Voltage Under-shoot at Power-Off Output Current Limitation DYNAMIC CHARACTERISTICS Output Dynamic Load Response 0.59Vout, Step Change In Output Current 0.59Vout, Setting Time 0.9Vout, Step Change In Output Current 0.9Vout, Setting Time 2.5Vout, Step Change In Output Current 2.5Vout, Setting Time 5Vout, Step Change In Output Current 5Vout, Setting Time Turn On Transient Turn On Delay by Enable Turn on Delay by Vin Turn on Rise time 0.9Vout, Maximum Output Capacitor 2.5Vout, Maximum Output Capacitor 5.0Vout, Maximum Output Capacitor Minimum Output Capacitive Load EFFICIENCY 0.59Vout 0.59Vout 0.9Vout 0.9Vout 1.8Vout 1.8Vout 2.5Vout 2.5Vout 5.0Vout 5.0Vout FEATURE CHARACTERISTICS Switching Frequency High Level Input Voltage Low Level Input Voltage GENERAL SPECIFICATIONS Calculated MTBF Weight DS_NE12S03A_10032008 Typ. 3.0 -40 -40 -40 3.0 Total load range turn on Total load range turn off Max. Units 13.8 123 TBD 125 3.3 5.0 Vdc °C °C °C V V 13.8 V 3.0 2.7 0.3 1 V V A mA mA mA dB V/mS A²S 5.0 +1 +0.5 +0.2 +0.6 +3 V % % % % % 20 25 30 35 40 50 15 3 0.5 100 6 mV mV mV mV mV mV mV A %Vo mV A Load change between 50%Io and 100%Io, Slew Rate 10A/uS Deviation decrease to 1%Vout Load change between 50%Io and 100%Io, Slew Rate 10A/uS Deviation decrease to 1%Vout Load change between 50%Io and 100%Io, Slew Rate 10A/uS Deviation decrease to 1%Vout Load change between 50%Io and 100%Io, Slew Rate 10A/uS Deviation decrease to 1%Vout 130 15 150 15 175 15 230 15 mV uS mV uS mV uS mV uS From Enable high to 90% of Vo From Vin=UVLO_ON to 90% of Vo 2 2 1.5 5.0Vout, operating, full load Remote OFF, Total input range Total input range Total input range 120Hz 120Hz High line input and zero load See figure30 With a 0.1% trim resistor Io=Io_min to Io_max Vin=Vin_min to Vin_max Ta=0~85°C Over load, line, temperature regulation and set point Full load 20MHz bandwidth with 1uF and 10uF ceramic capacitor Total input range , 0.59Vout Total input range , 0.9Vout Total input range , 1.8Vout Total input range , 2.5Vout Total input range , 3.3Vout Total input range , 5.0Vout Full Load, 10uF Tan cap, 12Vin, 5Vo 3.1 15 50 15 60 1 0.59 -1 -0.5 -0.2 -0.6 -3 10 15 20 25 30 40 10 0 Total input range, Turn ON Total input range, Turn OFF Hiccup mode 25 Co=1uF ceramic//10uF ceramic capacitor turn on overshoot <1% vo ,ESR≥1mΩ turn on overshoot <1% vo ,ESR≥1mΩ turn on overshoot <1% vo ,ESR≥1mΩ 3 3 2 1500 1000 500 0 Vin=3.3V, Io=3A Vin=12V, Io=3A Vin=3.3V, Io=3A Vin=12V, Io=3A Vin=3.3V, Io=3A Vin=12V, Io=3A Vin=3.3V, Io=3A Vin=12V, Io=3A Vin=12V, Io=3A Vin=12V, Io=3A, sink efficiency Fixed Module On (or leave the pin open) Module Off Ta=25℃, 200LFM, 80% load 65.5 65 74.5 73.5 85.5 83.5 89.5 86 92.5 91 % % % % % % % % % % 500 1.0 -0.3 5.5 0.4 TBD 1.4 ms ms ms µF µF uF µF KHz V V Mhours grams 2 95 95 85 85 75 75 Efficiency (%) Efficiency (%) ELECTRICAL CHARACTERISTICS CURVE 65 55 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 12Vin 5Vin 3.3Vin 35 35 0.3 55 45 12Vin 5Vin 3.3Vin 45 65 0.3 3 0.6 0.9 1.2 1.8 2.1 2.4 2.7 3 Figure 2: Converter efficiency vs. output current (0.9V output voltage, 3.3V/5V/12V input voltage) 95 95 85 85 75 75 Efficiency (%) Efficiency (%) Figure 1: Converter efficiency vs. output current (0.59V output voltage, 3.3V/5V/12V input voltage) 65 55 12Vin 5Vin 3.3Vin 45 65 55 12Vin 5Vin 3.3Vin 45 35 35 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 0.3 0.6 0.9 1.2 Output current (A) 1.5 1.8 2.1 2.4 2.7 3 Output current (A) Figure 3: Converter efficiency vs. output current (1.8V output voltage, 3.3V/5V/12V input voltage) Figure 4: Converter efficiency vs. output current (2.5V output voltage, 3.3V/5V/12V input voltage) 95 95 85 85 75 75 Efficiency (%) Efficiency (%) 1.5 Output current (A) Output current (A) 65 55 65 55 45 45 12Vin 5Vin 12Vin 35 35 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 Output current (A) Figure 5: Converter efficiency vs. output current (3.3V output voltage, 5V/12V input voltage) DS_NE12S03A_10032008 2.7 3 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 Output current (A) Figure 6: Converter efficiency vs. output current (5.0V output voltage, 12V input voltage) 3 ELECTRICAL CHARACTERISTICS CURVES (CON.) Figure 7: Output ripple & noise at 12Vin, 0.59V/3A out (20mV/div, 2uS/div) Figure 8: Output ripple & noise at 12Vin, 0.9V/3A out (20mV/div, 2uS/div) Figure 9: Output ripple & noise at 12Vin, 1.8V/3A out (20mV/div, 2uS/div) Figure 10: Output ripple & noise at 12Vin, 2.5V/3A out (20mV/div, 2uS/div) Figure 11: Output ripple & noise at 12Vin, 3.3V/3A out (20mV/div, 2uS/div) Figure 12: Output ripple & noise at 12Vin, 5.0V/3A out (20mV/div, 2uS/div) DS_NE12S03A_10032008 4 ELECTRICAL CHARACTERISTICS CURVES (CON.) Figure 13: Turn on delay time at 12Vin, 0.59V/3A out Ch1: Vin(5V/div) Ch4: Vout(0.5V/div) 5mS/div Figure 14: Turn on delay time Remote On/Off, 0.59V/3A out Ch1: Enable(1V/div) Ch4: Vout(0.5V/div) 5mS/div Figure 15: Turn on delay time at 12Vin, 0.9V/3A out Ch1: Vin(5V/div) Ch4: Vout(0.5V/div) 5mS/div Figure 16: Turn on delay time at Remote On/Off, 0.9V/3A out Ch1: Enable(1V/div) Ch4: Vout(0.5V/div) 5mS/div Figure 17: Turn on delay time at 12Vin, 2.5V/3A out Ch1: Vin(5V/div) Ch4: Vout(2V/div) 5mS/div Figure 18: Turn on delay time at Remote On/Off, 2.5V/3A out Ch1: Enable(1V/div) Ch4: Vout(2V/div) 5mS/div DS_NE12S03A_10032008 5 Figure 19: Turn on delay time at 12Vin, 5V/3A out Ch1: Vin(5V/div) Ch4: Vout(2V/div) 5mS/div 1.5A Figure 21: Typical transient response to step load change at 10A/μS between 50% and 100% load, at 12Vin, 0.59V out; CH2: VOUT(0.1V/div), CH4: Iout (0.5A/div), 100uS/div 1.5A Figure 23: Typical transient response to step load change at 10A/μS between 50% to 100% load, at 12Vin, 2.5V out CH2: VOUT(0.1V/div), CH4: Iout (0.5A/div), 100uS/div DS_NE12S03A_10032008 Figure 20: Turn on delay time at Remote On/Off, 5V/3A out Ch1: Enable(1V/div) Ch4: Vout(2V/div) 5mS/div 1.5A Figure 22: Typical transient response to step load change at 10A/μS between 50% to 100% load, at 12Vin, 0.9V out CH2: VOUT(0.1V/div), CH4: Iout (0.5A/div), 100uS/div 1.5A Figure 24: Typical transient response to step load change at 10A/μS between 50% to 100% load, at 12Vin, 5.0V out CH2: VOUT(0.1V/div), CH4: Iout (0.5A/div), 100uS/div 6 DESIGN CONSIDERATIONS The NE12S0A0V(H)03 uses a single phase and voltage mode controlled buck topology. The output can be trimmed from 0.59Vdc to 5.0Vdc by a resistor from Trim pin to Ground. The converter can be turned ON/OFF by remote control with positive on/off (ENABLE pin) logic. The converter DC output is disabled when the signal is driven low (below 0.4V). This pin is also used as the input turn on threshold judgment. Its voltage is percent of Input voltage during floating due to internal connection. So we do not suggest using an active high signal (higher than 1.0V) to turn on the module because this high level voltage will disable UVLO function. The module will turn on when this pin is floating and the input voltage is higher than the threshold. The converter can protect itself by entering hiccup mode against over current and short circuit condition. Also, the converter will shut down when an over voltage protection is detected. Safety Considerations It is recommended that the user to provide a very fast-acting type fuse in the input line for safety. The output voltage set-point and the output current in the application could define the amperage rating of the fuse. FEATURES DESCRIPTIONS Enable (On/Off) The ENABLE (on/off) input allows external circuitry to put the NE converter into a low power dissipation (sleep) mode. Positive ENABLE is available as standard. With the active high function, the output is guaranteed to turn on if the ENABLE pin is driven above 1.0V. The output will turn off if the ENABLE pin voltage is pulled below 0.4V. Undervoltage Lockout The ENABLE pin is also used as input UVLO function. Leaving the enable floating, the module will turn on if the input voltage is higher than the turn-on threshold and turn off if the input voltage is lower than the turn-off threshold. The default turn-on voltage is 3.0V with 300mV hysteresis. The turn-on voltage may be adjusted with a resistor placed between the “Enable” pin and “Ground” pin. The equation for calculating the value of this resistor is: 15.05 × (R + 6.46 ) + 0.5 6.46 × R = VEN _ RTH − 0.3V V EN _ RTH = VEN _ FTH VEN _ FTH is the turn-off threshold VEN _ RTH is the turn-on threshold R (Kohm) is the outen resistor connected from Enable pin to the GND Enable NE3A R Fig. 25. UVLO setting An active high voltage will disable the input UVLO function. DS_NE12S03A_10032008 7 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). 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 ND 6A/10A NE3A Vin Trim Enable ND6A/10A NE3A Vin Trim Ground Ground Figure 26: Enable Input drive circuit for NE series Ground Ground The NE03 module has a trim range of 0.59V to 5.0V. The trim resistor equation for the NE03A is : Vout Trim Ground 1182 Vout − 0.591 Vout is the output voltage setpoint Rs is the resistance between Trim and Ground Rs values should not be less than 268Ω Figure 27: Enable input drive circuit example with isolation. Output Voltage Rs (Ω) 0.59V +0.9 V +1.8 V +2.5 V +3.3 V open 3.82k 978 619 436 +5.0V 268 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. Ground Figure 28: Trimming Output Voltage Rs (Ω) = NDNE3A 6A/10A Enable Rs Vout Enable Vin Vout Figure 29: Typical trim resistor values The relationship between input voltage and output voltage shown as Figure 30 Vout 0.59V 0.9V 1.8V 2.5V 3.3V 5.0V Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y Y N Y Y Y N N Y Y Vin 3.3V 5.0V 8.0V 12V Figure 30: Relationship between Vin VS Vout 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. DS_NE12S03A_10032008 8 FEATURES DESCRIPTIONS (CON.) Output Capacitance Voltage Margining Adjustment There is internal output capacitor on the NE series modules. Hence, no external output capacitor is required for stable operation. Output voltage margin adjusting can be implemented in the NE modules by connecting a resistor, Rmargin-up, from the Trim pin to the Ground 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 voltage source Vt. Figure 31 shows the circuit configuration for output voltage margining adjustment. Vt ND 6A/10A NE3A Vin Reflected Ripple Current and Output Ripple and Noise Measurement The measurement set-up outlined in Figure 32 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on NE series converters. Rmargin-down Input reflected current measurement point Vout Ltest DC-DC Converter Vin+ Load Trim Enable Rmargin-up Cs Cin 1uF Ceramic Rs Ground Ground 10uF Tan Output voltage ripple noise measurement point Figure 31: Circuit configuration for output voltage margining Cs=270μF*1, Ltest=2uH, Cin=270μF*1 Paralleling Figure 32: Input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for NE03 NE03 converters do not have built-in current sharing (paralleling) ability. Hence, paralleling of multiple NE03 converters is not recommended. DS_NE12S03A_10032008 9 THERMAL CONSIDERATION THERMAL CURVES (VERTICAL) 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. The space between the neighboring PWB and the top of the power module is constantly kept at 6.35mm (0.25’’). Figure 34: Temperature measurement location* The allowed maximum hot spot temperature is defined at 123℃ Output Current (A) NE12S0A0V03(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin=3.3V Vout=0.9V (Airflow from Pin5 to Pin1) 3.0 Natural Convection 2.5 2.0 1.5 1.0 Thermal Derating 0.5 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. PWB FACING PWB 0.0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 35: Output current vs. ambient temperature and air velocity @Vin=3.3V, Vout=0.9V (Airflow from Pin5 to Pin1) Output Current (A) NE12S0A0V03(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin=5.0V Vout=0.9V (Airflow from Pin5 to Pin1) 3.0 Natural Convection MODULE 2.5 2.0 AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE 1.5 50.8 (2.0”) 1.0 AIR FLOW 0.5 11 (0.43”) 22 (0.87”) Note: Wind tunnel test setup figure dimensions are in millimeters and (Inches) 0.0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 36: Output current vs. ambient temperature and air velocity @Vin=5.0V, Vout=0.9V (Airflow from Pin5 to Pin1) Figure 33: Wind tunnel test setup DS_NE12S03A_10032008 10 THERMAL CURVES (VERTICAL) Output Current (A) NE12S0A0V03(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin=12V Vout=0.9V (Airflow from Pin5 to Pin1) Output Current (A) NE12S0A0V03(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin=12V Vout=2.5V (Airflow from Pin5 to Pin1) 3.0 3.0 Natural Convection 2.5 Natural Convection 2.5 100LFM 100LFM 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 200LFM 0.0 0.0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 37: Output current vs. ambient temperature and air velocity @Vin=12V, Vout=0.9V (Airflow from Pin5 to Pin1) Output Current (A) NE12S0A0V03(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin=3.3V Vout=2.5V (Airflow from Pin5 to Pin1) 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 40: Output current vs. ambient temperature and air velocity @Vin=12V, Vout=2.5V (Airflow from Pin5 to Pin1) Output Current (A) NE12S0A0V03(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin=12V Vout=5.0V (Airflow from Pin5 to Pin1) 3.0 3.0 Natural Convection 2.5 Natural Convection 2.5 100LFM 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 200LFM 300LFM 400LFM 0.0 0.0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 38: Output current vs. ambient temperature and air velocity@ Vin =3.3V, Vout=2.5V (Airflow from Pin5 to Pin1) Output Current (A) 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 41: Output current vs. ambient temperature and air velocity@ Vin =12V, Vout=5.0V (Airflow from Pin5 to Pin1) NE12S0A0V03(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin=5.0V Vout=2.5V (Airflow from Pin5 to Pin1) 3.0 Natural Convection 2.5 2.0 1.5 1.0 0.5 0.0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (℃) Figure 39: Output current vs. ambient temperature and air velocity@ Vin =5V, Vout=2.5V (Airflow from Pin5 to Pin1) DS_NE12S03A_10032008 11 MECHANICAL DRAWING VERTICAL DS_NE12S03A_10032008 HORIZONTAL 12 PART NUMBERING SYSTEM NE 12 S 0A0 Product Series Input Voltage Number of outputs Output Voltage NE- 12- 3.1~13.8V S- Single Output 0A0 - Non-isolated V 03 P N Mounting Output Current ON/OFF Logic Pin Length H - Horizontal 03 - 03A P - Positive F A Option Code N - 0.150” F- RoHS 6/6 programmable V - Vertical A - 5 pins (Lead Free) Series MODEL LIST Model Name Packaging Input Voltage Output Voltage Output Current NE12S0A0V03PNFA Vertical 3.1V~ 13.8Vdc 0.59V~ 5.0Vdc 3A Efficiency 12Vin 5Vout@ 100% l d 92.5% NE12S0A0H03PNFA Horizontal 3.1V~ 13.8Vdc 0.59V~ 5.0Vdc 3A 92.5% CONTACT: www.delta.com.tw/dcdc USA: Telephone: East Coast: (888) 335 8201 West Coast: (888) 335 8208 Fax: (978) 656 3964 Email: [email protected] Europe: Telephone: +41 31 998 53 11 Fax: +41 31 998 53 53 Email: [email protected] Asia & the rest of world: Telephone: +886 3 4526107 ext. 6220 Fax: +886 3 4513485 Email: [email protected] WARRANTY Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon request from Delta. Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications at any time, without notice. DS_NE12S03A_10032008 13