Delta Electronics 0.59V~5.1Vout Manuale utente

Delphi NE Series Non-Isolated Point of Load

DC/DC Modules: 4.5V~13.8Vin, 0.59V~5.1Vout, 20A

The Delphi NE 20A Series, 4.5 to 13.8V wide input, wide trim single

output, non-isolated point of load DC/DC converters are the latest

offering from a world leader in power systems technology and

manufacturing —Delta Electronics, Inc. The ND/NE product family is

the second generation, non-isolated point-of-load DC/DC power

modules for the datacom applications which cut the module size by

almost 50% in most of the cases compared to the first generation NC

series POL modules. The product family here provides 20A of output

current in a vertically or horizontally mounted through-hole package

and the output can be resistor trimmed from 0.59Vdc to 5.1Vdc. 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.

OPTIONS

 Vertical or horizontal versions

APPLICATIONS

 DataCom

 Distributed power architectures

 Servers and workstations

 LAN/WAN applications

 Data processing applications

FEATURES

 High Efficiency:

94.0% @ 12Vin, 5V/20A out

 Size:

Vertical: 30.5x15.5x12.0mm

(1.20”x0.61”x0.47”)

Horizontal: 30.5x15.5x12.9mm

(1.20”x0.61”x0.51”)

 Wide input range: 4.5V~13.8V

 Output voltage programmable from

0.59Vdc to 5.1Vdc via external resistors

 Voltage and resistor-based trim

 No minimum load required

 Fixed frequency operation

 Input UVLO, output OCP

 Remote ON/OFF (Positive)

 ISO 9001, TL 9000, ISO 14001, QS9000,

OHSAS18001 certified manufacturing facility

 UL/cUL 60950 (US & Canada), TUV

(EN60950) --pending

PRELIMINARY DATASHEET

DS_NE12S20A_072722007

Preliminary DS_NE12S20A_07272007

TECHNICAL SPECIFICATIONS

(Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.)

PARAMETER NOTES and CONDITIONS NE12S0A0V/H20

Min. Typ. Max. Units

ABSOLUTE MAXIMUM RATINGS

Input Voltage operation 4.5 13.8 Vdc

Operating Temperature (Vertical) Refer to Fig.25 for the measuring point 0 130 °C

Operating Temperature (Horizontal) Refer to Fig.25 for the measuring point 0 TBD °C

Storage Temperature -55 125 °C

INPUT CHARACTERISTICS

Operating Input Voltage 4.5 13.8 V

Input Under-Voltage Lockout

Turn-On Voltage Threshold 4.3 V

Turn-Off Voltage Threshold 3.3 V

Lockout Hysteresis Voltage 1.0 V

Maximum Input Current 12Vin, 5Vo, operating, full load 8.9 A

No-Load Input Current Vin=12V, Vout=5V 150 mA

Off Converter Input Current Remote OFF 10 mA

Input Reflected-Ripple Current P-P thru 2uH inductor 5Hz to 20MHz 30 mA

Input Ripple Rejection 120Hz 60 dB

OUTPUT CHARACTERISTICS

Output Voltage Adjustment Range 0.59 5.1 V

Output Voltage Set Point With a 0.1% trim resistor -1 +1 %Vo

Output Voltage Regulation

Over Load Io=Io_min to Io_max -0.5 +0.5 %Vo

Over Line Vin=Vin_min to Vin_max -0.2 +0.2 %Vo

Total output range Over load, line, temperature regulation and set point -2.0 +2.0 %Vo

Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 10uF Tan cap, 12Vin, 5Vo 20 mV

RMS Full Load, 10uF Tan cap, 12Vin, 5Vo 5 mV

Output Current Range 0 20 A

Output Voltage Under-shoot at Power-Off Vin=12V, Turn OFF 100 mV

Output short-circuit current, RMS value Continuous 3.6 A

Output DC Current-Limit Inception Hiccup mode 110 200 %Iomax

DYNAMIC CHARACTERISTICS

Output Dynamic Load Response 12Vin, 2.5Vout, 10µF ceramic cap

Positive Step Change in Output Current 75~100% load , 5A/uS 200 mV

Negative Step Change in Output Current 100~75% load , 5A/uS 200 mV

Settling Time Settling to be within regulation band (to 10% Vo deviation) 100 µs

Turn-On Transient

Start-Up Time, from On/Off Control From Enable high to 90% of Vo 2 3 ms

Start-Up Time, from input power From Vin=12V to 90% of Vo 2 3 ms

Minimum Output Capacitance 0 µF

5.0Vo,Maximum Output Capacitance Turn on overshoot <1% vo ,ESR≥1m2000 µF

EFFICIENCY

Vo=0.59V Vin=12V, Io=20A 75 %

Vo=0.9V Vin=12V, Io=20A 80.5 %

Vo=2.5V Vin=12V, Io=20A 91 %

Vo=5.0V Vin=12V, Io=20A 94 %

SINKEFFICIENCY

Vo=5.0V Vin=12V, Io=20A 92 %

FEATURE CHARACTERISTICS

Switching Frequency Fixed 500 KHz

ON/OFF Control Positive logic (internally pulled high)

Logic High Module On (or leave the pin open) 0.8 5.0 V

Logic Low Module Off 0 0.3 V

GENERAL SPECIFICATIONS

Calculated MTBF 25℃, 300LFM, 80% load TBD Mhours

Weight 8.8 grams

Preliminary DS_NE12S20A_07272007

ELECTRICAL CHARACTERISTICS CURVES

1 2 4 6 8 101214161820

Output current (A)

Efficiency (%)

1 2 4 6 8 10 12 14 16 18 20

Output current (A)

Efficiency (%)

Figure 1: Converter efficiency vs. output current

(0.59V output voltage, 12V input)

Figure 2: Converter efficiency vs. output current

(0.9V output voltage, 12V input)

12468101214161820

Output current (A)

Efficiency (%)

1 2 4 6 8 101214161820

Output current (A)

Efficiency (%)

Figure 3: Converter efficiency vs. output current

(1.5V output voltage, 12V input)

Figure 4: Converter efficiency vs. output current

(2.5V output voltage, 12V input)

1 2 4 6 8 101214161820

Output current (A)

Efficiency (%)

1 2 4 6 8 101214161820

Output current (A)

Efficiency (%)

Figure 5: Converter efficiency vs. output current

(3.3V output voltage, 12V input)

Figure 6: Converter efficiency vs. output current

(5.0V output voltage, 12V input)

Preliminary DS_NE12S20A_07272007

ELECTRICAL CHARACTERISTICS CURVES (CON.)

Figure 7: Output ripple & noise at 12Vin, 0.59V/20A out

Figure 8: Output ripple & noise at 12Vin, 0.9V/20A out

Figure 9: Output ripple & noise at 12Vin, 1.5V/20A out

Figure 10: Output ripple & noise at 12Vin, 2.5V/20A out

Figure 11: Output ripple & noise at 12Vin, 3.3V/20A out

Figure 12: Output ripple & noise at 12Vin, 5.0V/20A out

Preliminary DS_NE12S20A_07272007

ELECTRICAL CHARACTERISTICS CURVES (CON.)

Figure 13: Turn on delay time at 12Vin, 0.59V/20A out

Ch1: Vin, Ch4: Vout Figure 14: Turn on delay time Remote On/Off, 2.5V/20A out

Ch1: Enable, Ch4: Vout

Figure 15: Turn on delay time at 12Vin, 3.3V/20A out

Ch1: Vin, Ch4: Vout Figure 16: Turn on delay time at Remote On/Off, 5.0V/20A out

Ch1: Enable, Ch4: Vout

Figure 17: Typical transient response to step load change at 5A/µS

from 75%~100% load, at 12Vin, 2.5V out

Preliminary DS_NE12S20A_07272007

DESIGN CONSIDERATIONS

The NE12S0A0V(H)20 uses a single phase and voltage

mode controlled buck topology. The output can be

trimmed in the range of 0.59Vdc to 5.1Vdc by a resisto

from Trim pin to Ground.

The converter can be turned ON/OFF by remote control

with positive on/off (ENABLE pin) logic. The converte

DC output is disabled when the signal is driven lo

(below 0.3V). This pin is also used as the input turn on

threshold judgment. Its voltage is percent of Inpu

voltage during floating due to internal connection. So we

do not suggest using an active high signal (higher than

0.8V) 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 0.8V. The outpu

will turn off if the ENABLE pin voltage is pulled below

0.3V

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 turn on threshold and turn of

if the input voltage is lower than turn off threshold. The

default Turn-on voltage is 4.3V with 1V Hysteresis.

The Turn-on voltage may be adjusted with a resisto

placed between the “Enable” pin and “Ground” pin.

The formula for calculating the value of this resistor is:

5.1

2.18 )2.18(50

VRTHEN

−

RTHENFTHEN VV

NE20A

Enable

Fig. 18. Enable POR circuit.

FTHEN

V_is the falling threshold

RTHEN

V_is the rising threshold that you want.

R (Kohm) is the outen resistor that you connect from

Enable pin to the GND

Also, you will see an active high voltage will disable the

input UVLO function

Preliminary DS_NE12S20A_07272007

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 21 and the typical trim

resistor values are shown in Table 1.

FEATURES DESCRIPTIONS (CON.)

The ENABLE input can be driven in a variety of ways as

shown in Figures 19 and 20. If the ENABLE signal comes

from the primary side of the circuit, the ENABLE can be

driven through either a bipolar signal transistor (Figure

18).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 19).

ND6A/10A

Vout

Ground

Trim

Enable

Ground

Vin

Figure 19: Enable Input drive circuit for NE series

Ground

ND 6A/10A

Vin

Vout

Trim

Enable

Figure 20: Enable input drive circuit example with isolation.

Input Under-Voltage Lockout

The input under-voltage lockout prevents the converte

from being damaged while operating when the inpu

voltage is too low. The lockout occurs between 3.3V to

4.3V.

Over-Current and Short-Circuit Protection

The NE series modules have non-latching over-curren

and short-circuit protection circuitry. When over curren

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.

Vin Vout

Enable

Ground Ground

Trim

ND 6A/10A

Figure 21: Trimming Output Voltage

The NE20 module has a trim range of 0.59V to 5.0V.

The trim resistor equation for the NE20A is:

591.0

1182

)( −

=Ω Vout

Vout is the output voltage setpoint

Rs is the resistance between Trim and Ground

Rs values should not be less than 240

Output Voltage Rs (Ω)

0.59V open

+1 V 2.4k

+1.5 V 1.3K

+2.5 V 619

+3.3 V 436

+5.0V 268

Table 1: Typical trim resistor values

NE2

Preliminary DS_NE12S20A_07272007

Vin Vout

Enable

Ground Ground

Trim

Figure 22: Circuit configuration for output voltage margining

Paralleling

NE20 converters do not have built-in current sharing

(paralleling) ability. Hence, paralleling of multiple NE20

converter is not recommended.

D 6A/10A

Rmargin-down

Rmargin-up

NE20

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 lowe

by connecting a resistor, Rmargin-down, from the Trim pin to

the voltage source Vt. Figure 22 shows the circuit

configuration for output voltage margining adjustment.

Voltage Margining Adjustment

FEATURES DESCRIPTIONS (CON.)

Output Capacitance

There is internal output capacitor on the NE series

modules. Hence, no external output capacitor is required

for stable operation.

Reflected Ripple Current and Output Ripple and

Noise Measurement

The measurement set-up outlined in Figure 23 has been

used for both input reflected/ terminal ripple current and

output voltage ripple and noise measurements on NE

series converters.

DC-DC Converter

1uF

Ceramic Ta n

10uF

Vin+ Load

Ltest

Cs Cin

Output voltage ripple noise measurement point

Input reflected current measurement point

Cs=270µF*1, Ltest=2uH, Cin=270µF*1

Figure 23: Input reflected ripple/ capacitor ripple current and

output voltage ripple and noise measurement setup for NE20

Preliminary DS_NE12S20A_07272007

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.

THERMAL CURVES (NE12S0A0V20)

Hence, the choice of equipment to characterize the

thermal performance of the power module is a wind

tunnel.

Figure 25: Temperature measurement location* The allowed

maximum hot spot temperature is defined at 130

℃

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=12V Vout=5.0V (Through PWB Orientation)

25 30 35 40 45 50 55 60 65 70 75 80 85

Natural

Convection

100LFM 200LFM

Ambient Tem

erature

(

℃

)

Output Current (A)

500LFM

400LFM

600LFM

300LFM

Figure 26: Output current vs. ambient temperature and air

velocity @Vin=12V, Vout=5.0V (Through PWB Orientation)

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=12V Vout=2.5V (Through PWB Orientation)

25 30 35 40 45 50 55 60 65 70 75 80 85

Natural

Convection 100LFM 200LFM

Ambient Temperature (

℃

)

Output Current (A)

500LFM

400LFM

600LFM

300LFM

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’’).

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.

MODULE

IR FLOW

11 (0.43”)

50.8 (2.0”)

FACING PWB PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

22 (0.87”)

Note: Wind tunnel test setup figure dimensions are in

millimeters and (Inches)

Figure 24: Wind tunnel test setup

Figure 27: Output current vs. ambient temperature and air

velocity@ Vin=12V, Vout=2.5V (Through PWB Orientation)

Preliminary DS_NE12S20A_07272007

THERMAL CURVES (NE12S0A0V20)

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=5.0V Vout=2.5V (Through PWB Orientation)

25 30 35 40 45 50 55 60 65 70 75 80 85

Natural

Convection 100LFM 200LFM

Ambient Temperature (

℃

)

Output Current (A)

500LFM

400LFM

600LFM

300LFM

Figure 28: Output current vs. ambient temperature and air

velocity@ Vin=5.0V, Vout=2.5V (Through PWB Orientation)

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=12V Vout=0.9V (Through PWB Orientation)

25 30 35 40 45 50 55 60 65 70 75 80 85

Natural

Convection 100LFM 200LFM

Ambient Temperature

(

)

Output Current (A)

500LFM

400LFM

300LFM

Figure 29: Output current vs. ambient temperature and air

velocity @Vin=12V, Vout=0.9V (Through PWB Orientation)

NE12S0A0V20(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=5.0V Vout=0.9V (Through PWB Orientation)

25 30 35 40 45 50 55 60 65 70 75 80 85

Natural

Convection 100LFM

200LFM

Ambient Temperature (

℃

)

Output Current (A)

400LFM

300LFM

Figure 30: Output current vs. ambient temperature and air

velocity@ Vin=5.0V, Vout=0.9V (Through PWB Orientation)

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