Delta Electronics NC15 Series User's Manual

Delphi NC15 Series Non-Isolated Point of Load

DC/DC Power Modules: 12Vin, 0.9V-5.0Vout, 15A

The Delphi NC15 Series, 12V input, 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 NC15 series operates from a 12V nominal input, provides up to 15A of power in a vertical or horizontal mounted through-hole package and the output can be resistor- or voltage-trimmed from 0.9Vdc to 5.0Vdc. It provides a very cost effective 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.

FEATURES

High Efficiency:

91% @ 12Vin, 5V/15A out

Size: 30.5x27.9x11.4mm

(1.20”×1.10”×0.45”) -- Vertical

30.5x27.9x12.9mm

(1.20”×1.10”×0.51”) -- Horizontal

Voltage and resistor-based trim

No minimum load required

Output voltage programmable from

0.9Vdc to 5.0Vdc via external resistors

Fixed frequency operation

Input UVLO, output OCP, SCP

Power good output signal

Remote ON/OFF (default: Positive)

ISO 9000, TL 9000, ISO 14001 certified manufacturing facility

UL/cUL 60950-1 (US & Canada)

Recognized, and TUV (EN60950-1)

Certified

CE mark meets 73/23/EEC and 93/68/EEC directives

OPTIONS

Vertical or horizontal versions

Negative ON/OFF logic

APPLICATIONS

DataCom

Distributed power architectures

Servers and workstations

LAN / WAN applications

Data processing applications

DATASHEET

DS_NC12S15A_01102008

TECHNICAL SPECIFICATIONS

(Ambient Temperature=25°C, minimum airflow=200LFM, nominal V in

=12Vdc unless otherwise specified.)

PARAMETER

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Operating Temperature (Vertical)

Operating Temperature (Horizontal)

Storage Temperature

Input/Output Isolation Voltage

INPUT CHARACTERISTICS

Operating Input Voltage

Input Under-Voltage Lockout

Turn-On Voltage Threshold

Turn-Off Voltage Threshold

Lockout Hysteresis Voltage

Maximum Input Current

No-Load Input Current

Off Converter Input Current

Input Reflected-Ripple Current

Input Ripple Rejection

OUTPUT CHARACTERISTICS

Output Voltage Adjustment Range

Output Voltage Set Point

Output Voltage Regulation

Over Load

Over Line

Output Voltage Ripple and Noise

Peak-to-Peak

RMS

Output Current Range

Output Voltage Over-shoot at Start-up

Output Voltage Under-shoot at Power-Off

Output DC Current-Limit Inception

Output Short-Circuit Current

DYNAMIC CHARACTERISTICS

Output Dynamic Load Response

Positive Step Change in Output Current

Negative Step Change in Output Current

Settling Time

Turn-On Transient

Start-Up Time, from On/Off Control

Start-Up Time, from input power

Minimum Output Capacitance

Maximum Output Startup Capacive Load

Minimum Input Capacitance

NOTES and CONDITIONS

With appropriate air flow and derating, see Figs 33

With appropriate air flow and derating, see Figs 39

Non-isolated

100% Load, 10.2Vin, 5.0Vout

Vin=12V, Vout=0.9V

Remote OFF

Refer to Figure 31.

120Hz

With a 1.0% trim resistor

Io=Io_min to Io_max

Vin=Vin_min to Vin_max

5Hz to 20MHz bandwidth

Full Load, 100nF ceramic, 10µF tantalum

Full Load, 100nF ceramic, 10µF tantalum

Vin=12V, Turn ON

Vin=12V, Turn OFF

Hiccup mode

Hiccup mode

12Vin, 100nF ceramic, 10µF tantalum load cap, 10A/µs

50% Io_max to 75% Io_max

75% Io_max to 50% Io_max

Settling to be within regulation band (Vo +/- 2.5%)

From Enable high to 10% of Vo

From Vin=12V to 10% of Vo

Ex: OSCON 6.3V/680µF (ESR 13 mΩ max.)

Full Load

Ex: OSCON 16V/270µF (ESR 18 mΩ max.)

EFFICIENCY

Vo=0.9V Vin=12V, Io=15A

Io=15A


Io=15A


Io=15A

Vo=5.0V

FEATURE CHARACTERISTICS

Switching Frequency

ON/OFF Control

Logic High

Logic Low

GENERAL SPECIFICATIONS

MTBF

Weight

Vin=12V, Io=15A fixed

Positive logic (internally pulled high)

Module On (or leave the pin open)

Module Off

Telcordia SR-332 Issue1 Method1 Case3 at 50°C

NC12S0A0V/H15

Min. Typ.

0

0

-40

NA

Max.

14

130

125

125

0.9

-2.5

-1.0

-0.2

0

16

10.2 12.0 13.8

9.0

7.5

1.5

65

9

150

8.1

45

5.0

+2.5

+1.0

+0.2

50

20

15

1

100

2.4

0

680

270

100

100

200

10

10

6800 mV mV

µs ms ms

µF

µF

µF

75 %

81 %

87 %

91

300

2.1

16.5

5.5

0.8

%

KHz

V

V

M hours grams

Units

Vdc

°C

°C

°C

V

V

%

%

% mV mV

A

% mV

A

A mA mA mA

V

V

V

V dB

NC12S15A_01102008

2

ELECTRICAL CHARACTERISTICS CURVES

90

80

40

30

20

10

70

60

50

10.2

12 13.8

0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Output Current (A)

Figure 1:

Converter efficiency vs. output current

(0.9V output voltage)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Output Current (A)

Figure 3: Converter efficiency vs. output current


100

90

80

70

60

50

40

30

20

10

0

100

90

80

70

60

50

40

30

20

10

0

10.2

10.2

12

12

13.8

13.8

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Output Current (A)



90

80

70

60

50

40

30

20

10

10.2

12 13.8

0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Output Current (A)

Figure 2:

Converter efficiency vs. output current


100

90

80

70

60

50

40

30

20

10

0

10.2

12 13.8

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Output Current (A)



100

90

80

70

60

50

40

30

20

10

0

10.2

12 13.8

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Output Current (A)



NC12S15A_01102008

3


Figure 7:

Output ripple & noise at 12Vin, 0.9V/15A out

Figure 8:


Figure 9:


Figure 10:


Figure 11:


NC12S15A_01102008

Figure 12:


4


Figure 13:

Turn on delay time at 12Vin, 0.9V/15A out

Ch2:Vin Ch3:Vout Ch4:PWRGD

Figure 14:

Turn on delay time Remote On/Off, 0.9V/15A out

Ch2:ENABLE Ch3:Vout Ch4:PWRGD

Figure 15: Turn on delay time at 12Vin, 2.5V/15A out


Figure 16: Turn on delay time at Remote On/Off, 2.5V/15A out


Figure 17: Turn on delay time at 12Vin, 5.0V/15A out


NC12S15A_01102008

Figure 18: Turn on delay time at Remote On/Off, 5.0V/15A out


5


Figure 19:

Typical transient response to step load change at

10A/μS from 50% to 75% and 75% to 50% of Io_max at

Figure 20:



12Vin, 0.9V out 12Vin, 1.2V out

Figure 21:



Figure 22:



12Vin, 2.5V out 12Vin, 5.0V out

NC12S15A_01102008

6

DESIGN CONSIDERATIONS

The NC15 is a single phase and voltage mode controlled

Buck topology. Block diagram of the converter is shown in

Figure 23. The output can be trimmed in the range of

0.9Vdc to 5.0Vdc by a resistor from Trim pin to Ground.

The converter can be turned ON/OFF by remote control.

Positive on/off (ENABLE pin) logic implies that the converter DC output is enabled when this signal is driven high (greater than 2.4V) or floating and disabled when the signal is driven low (below 0.8V). Negative on/off logic is optional and could also be ordered.

The converter provides an open collector signal called

Power Good. The power good signal is pulled low when output is not within ±10% of Vout or Enable is OFF.

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.

FEATURES DESCRIPTIONS

ENABLE (On/Off)

The ENABLE (on/off) input allows external circuitry to put the NC converter into a low power dissipation (sleep) mode. Positive (active-high) ENABLE is available as standard.

Positive ENABLE (active-high) units of the NC series are turned on if the ENABLE pin is high or floating. Pulling the pin low will turn off the unit. With the active high function, the output is guaranteed to turn on if the ENABLE pin is driven above 2.4V. The output will turn off if the ENABLE pin voltage is pulled below .8V.

The ENABLE input can be driven in a variety of ways as shown in Figures 24, 25 and 26. If the ENABLE signal comes from the primary side of the circuit, the ENABLE can be driven through either a bipolar signal transistor

(Figure 24) or a logic gate (Figure 25). 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 26).

NC6A/15A/20A

Vout

Vin

Enable Trim

Figure 23: Block Diagram

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 current rating of the fuse.

Ground

Enable

Ground

Figure 24: Enable Input drive circuit for NC series

5V

NC6A/15A/20A

Vout

Vin

Trim

Ground Ground

Figure 25: Enable input drive circuit using logic gate.

NC6A/15A/20A

Vout

Vin

Enable

Trim

NC12S15A_01102008

Ground Ground

Figure 26 : Enable input drive circuit example with isolation.

7

FEATURES DESCRIPTIONS (CON.)

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

Vout

Vin

Trim

Enable

Rs

Ground Ground

Figure 27:

Trimming Output Voltage

NC12S15A_01102008

The NC06/NC15/NC20 module has a trim range of 0.9V to 5.0V. The trim resistor equation for the NC6A/NC15A/

NC20A is :

Rs (

Ω

)

=

1170

Vout

−

0 .

9

Vout is the output voltage setpoint

Rs is the resistance between Trim and Ground

Rs values should not be less than 280Ω

Output Voltage

+0.9 V

+1.2 V

+1.5 V

+1.8 V

+2.5 V

+3.3 V

+5.0 V

Rs (Ω)

OPEN

3.92K

1.96K

1.3K

732

487

287

Figure 28:

Typical trim resistor values

NC6A/15A/20A

Vout

Vin

1.3K

Trim

Enable

Rt

Vt

Rs

Ground Ground

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) :

Rt ( k

Ω

)

=

1 .

Rs

17

−

( 1 .

3 Vt

Rs (

−

1 .

17 )

Vout

−

0 .

9 )

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

Rt ( K

Ω

)

=

1 .

Rs

17

−

( 1 .

3 Vt

Rs (

−

1 .

17 )

Vout

−

0 .

9 )

=

12 .

51 K

Ω

8

FEATURES DESCRIPTIONS (CON.)

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.

Current Sink Capability

The NC series converters are able to sink current as well as function as a current source. It is able to sink the full output current at any output voltage up to and including

2.5V. This feature allows the NC series fit into any voltage termination application.

Voltage Margining Adjustment

Output voltage margin adjusting can be implemented in the NC modules by connecting a resistor, R margin-up

, from the Trim pin to the Ground for for margining up the output voltage. Also, the output voltage can be adjusted lower by connecting a resistor, R margin-down

, from the Trim pin to the voltage source Vt. Figure 30 shows the circuit configuration for output voltage margining adjustment.

Vt

NC6A/15A/20A

Vout

Vin

Rmargin-down

Trim

Enable

Rmargin-up

Rs

Ground Ground

Figure 30: Circuit configuration for output voltage margining

Paralleling

NC06/NC15/NC20 converters do not have built-in current sharing (paralleling) ability. Hence, paralleling of multiple

NC06/NC15/NC20 converters is not recommended.

Output Capacitance

There is no output capacitor on the NC series modules.

Hence, an external output capacitor is required for stable operation. For NC15 modules, a n external 6.3V/680μF low ESR capacitor (for example, OSCON) is 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.

Reflected Ripple Current and Output Ripple and

Noise Measurement

The measurement set-up outlined in Figure 31 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on NC series converters.

Cs=270μF*1, Ltest=1.4μH, Cin=270μF*1, Cout=680μF *1

Figure 31: Input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for NC15

NC12S15A_01102008

9

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. 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.

NC12S15A_01102008

10

THERMAL CURVES (NC12S0A0V15)

FACING PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

AIR FLOW

PWB

MODULE

50.8 (2.0”)

17.5 (0.69”)

35 (1.38”)

Note:

Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)

Figure 32:

Wind tunnel test setup

12

9

6

Figure 33: Temperature measurement location

* The allowed maximum hot spot temperature is defined at 130 ℃

NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity

Output Current(A)

@ Vout = 5V (Either Orientation)

15

Natural

Convection

100LFM

200LFM

300LFM

400LFM

3

0

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

Ambient Temperature (℃)

Figure 34:

Output current vs. ambient temperature and air

15


Output Current(A)

@ Vout = 3.3V (Either Orientation)

12

9

6

3

12

9

6

3

Natural

Convection

100LFM

200LFM

300LFM

400LFM

0

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


Figure 35: Output current vs. ambient temperature and air velocity@ Vout=3.3V(Either Orientation)


Output Current(A)


15

Natural

Convection

100LFM

200LFM

300LFM

12

9

6

3

0

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




Output Current(A)


15

Natural

Convection

100LFM

200LFM

300LFM

0

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



11

THERMAL CURVES (NC12S0A0H15)

FACING PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

PWB

MODULE

50.8 (2.0”)

9

6

3

15

NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity

Output Current(A)

@ Vout =3.3V (Either Orientation)

12

Natural

Convection

100LFM

200LFM

300LFM

AIR FLOW

9

6

3

9.5 (0.37”)

19 (0.75”)

Note:

Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)

Figure 38:

Wind tunnel test setup

0

25 35 45 55 65 75 85




Output Current(A)


15

12

9

6

3

Natural

Convection

100LFM

200LFM

Figure 39: Temperature measurement location

* The allowed maximum hot spot temperature is defined at 125 ℃


Output Current(A)

@ Vout =5V (Either Orientation)

15

0

25 35 45 55 65 75 85


Figure 42:

Output current vs. ambient temperature and air velocity@ Vout=1.8V(Either Orientation)


Output Current(A)


15

12

Natural

Convection

100LFM

200LFM

300LFM

400LFM

12

9

6

Natural

Convection

100LFM

200LFM

3

0

25 35 45 55 65 75 85


Figure 40: Output current vs. ambient temperature and air velocity @Vout=5V(Either Orientation)

NC12S15A_01102008

0

25 35 45 55 65 75 85


Figure 43:

Output current vs. ambient temperature and air velocity@ Vout=0.9V(Either Orientation)

12

MECHANICAL DRAWING

VERTICAL HORIZONTAL

NC12S15A_01102008

13

PART NUMBERING SYSTEM

NC 12 S 0A0 V 15 P N F A

Product

Series

NC-

Non-isolated

Converter

Input

Voltage

Number of outputs

12- S- Single

10.2~13.8V output

Output

Voltage

0A0- programmable

Mounting

H- Horizontal

V- Vertical

Output

Current

15 - 15A

ON/OFF

Logic

P- Positive

N- Negative

Pin

Length

R- 0.118”

N- 0.14”

Option

Code

F- RoHS 6/6

(Lead Free)

A- Standard function.

MODEL LIST

Model Name Packaging Input Voltage Output Voltage Output Current

Efficiency

12Vin @ 100% load

NC12S0A0V15PNFA

NC12S0A0H15PNFA

Vertical

Horizontal

10.2 ~ 13.8Vdc

10.2 ~ 13.8Vdc

0.9 V ~ 5.0Vdc

0.9 V ~ 5.0Vdc

15A

15A

91% (5.0V)

91% (5.0V)

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


Asia & the rest of world:

Telephone: +886 3 4526107 x6220

Fax: +886 3 4513485


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 .

NC12S15A_01102008

14

Delta Electronics NC15 Series User's Manual

Delphi NC15 Series Non-Isolated Point of Load

DC/DC Power Modules: 12Vin, 0.9V-5.0Vout, 15A

FEATURES

OPTIONS

APPLICATIONS

TECHNICAL SPECIFICATIONS

ELECTRICAL CHARACTERISTICS CURVES

ELECTRICAL CHARACTERISTICS CURVES

ELECTRICAL CHARACTERISTICS CURVES

ELECTRICAL CHARACTERISTICS CURVES

DESIGN CONSIDERATIONS

FEATURES DESCRIPTIONS

ENABLE (On/Off)

Safety Considerations

FEATURES DESCRIPTIONS (CON.)

Input Under-Voltage Lockout

Over-Current and Short-Circuit Protection

Output Voltage Programming

FEATURES DESCRIPTIONS (CON.)

Power Good

Current Sink Capability

Voltage Margining Adjustment

Paralleling

Output Capacitance

Reflected Ripple Current and Output Ripple and

Noise Measurement

THERMAL CONSIDERATION

Thermal Testing Setup

Thermal Derating

THERMAL CURVES (NC12S0A0V15)

THERMAL CURVES (NC12S0A0H15)

MECHANICAL DRAWING

PART NUMBERING SYSTEM

MODEL LIST

CONTACT: www.delta.com.tw/dcdc

WARRANTY

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