GE Industrial Solutions NaOS NXA025 SMT User Manual

Data Sheet October 5, 2009

NaOSTM NXA025 SMT Non-isolated Power Modules:

10Vdc – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A Output Current

RoHS Compliant

Applications

 Distributed power architectures

 Intermediate bus voltage applications

 Telecommunications equipment

 Servers and storage applications

 Networking equipment

 Enterprise Networks

 Latest generation IC’s (DSP, FPGA, ASIC)

and Microprocessor powered applications

Options

 Baseplate version for heatsink attachment

(-H suffix)

 Through Hole version (-L)

 Paralleling with current sharing (-P)

Features

 Compliant to RoHS EU Directive 2002/95/EC (-Z

versions)

 Compliant to ROHS EU Directive 2002/95/EC with

lead solder exemption (non-Z versions)

 Delivers up to 25A output current

 High efficiency – 93% at 3.3V full load

 Small size and low profile:

47.2 mm x 29.4 mm x 8.50 mm

(1.86 in x 1.16 in x 0.335 in)

 Low output ripple and noise

 Constant switching frequency (500 kHz)

 Surface mount or through hole

 Output voltage programmable from 0.8 Vdc to

5.5Vdc via external resistor

 Remote On/Off

 Remote Sense

 Parallel operation with current sharing (-P option)

 Output voltage sequencing (multiple modules)

 Output overvoltage protection

 Overtemperature protection

 Output overcurrent protection (non-latching)

 Wide operating temperature range (-40°C to 85°C)

†

 UL* 60950-1Recognized, CSA

03 Certified, and VDE Licensed

 ISO** 9001 and ISO 14001 certified manufacturing

facilities

‡

0805:2001-12 (EN60950-1)

C22.2 No. 60950-1-

Description

The NXA025 series SMT (surface-mount technology) power modules are non-isolated dc-dc converters that can deliver up to 25A of output current with full load efficiency of 93% at 3.3Vdc output voltage. These modules provide a precisely regulated output voltage from 0.8Vdc to 5.5Vdc, programmable via an external resistor. Their openframe construction and small footprint enable designers to develop cost- and space-efficient solutions. Standard features include remote On/Off, adjustable output voltage, remote sense, active current sharing between parallel modules, output voltage sequencing of multiple modules, overcurrent, overvoltage, and overtemperature protection.

* UL is a re gistered trademark of Underwriters Laboratories, Inc.

†

CSA is a reg istered trademark of Canadian Standards Associ ation.

‡

VDE is a t rademark of Verband Deutscher Elektrotechniker e.V.

** ISO is a registered trademark of the International Orga nization of Standards

Document No: DS03-030 ver. 1.43

PDF name: nxa025_smt_ds.pdf

Data Sheet October 5, 2009

10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current

Naos

TM

NXA025 SMT Non-isolated Power Modules:

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability.

Parameter Device Symbol Min Max Unit

Input Voltage All V

Continuous

Operating Ambient Temperature All T

(see Thermal Considerations section)

Storage Temperature All T

IN

A

stg

-0.3 14 Vdc

-40 85 °C

-55 125 °C

Electrical Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.

Parameter Device Symbol Min Typ Max Unit

Operating Input Voltage All VIN 10.0 12.0 14.0 Vdc

Maximum Input Current All I

(VIN=10.0V to 14.0V, IO=I

Inrush Transient All I2t 1 A2s

Input Reflected Ripple Current, peak-to-peak (5Hz to 20MHz, 1μH source impedance; V V

= I

IN, max, IO

Input Ripple Rejection (120Hz) All 50 dB

; See Test configuration section)

Omax

)

O, max

IN, min

to

All 60 mAp-p

IN,max

CAUTION: This power module is not internally fused. An input line fuse must always be used.

This power module can be used in a wide variety of applications, ranging from simple standalone operation to being part of a complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fastacting fuse with a maximum rating of 30A (see Safety Considerations section). Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data sheet for further information.

14 Adc

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Data Sheet October 5, 2009

10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current

Naos

TM

NXA025 SMT Non-isolated Power Modules:

Electrical Specifications (continued)

Parameter Device Symbol Min Typ Max Unit

Output Voltage Set-point All V

(VIN=V

N, min

, IO=I

, TA=25°C)

O, max

Output Voltage All V

(Over all operating input voltage, resistive load, and temperature conditions until end of life)

Adjustment Range All V

Selected by an external resistor

O, set

O

Output Regulation

Line (VIN=V

Load (IO=I

Temperature (T

IN, min

O, min

to V

to I

ref=TA, min

) All

IN, max

) All

O, max

to T

) All ⎯ 0.5 1 % V

A, max

Output Ripple and Noise on nominal output

(VIN=V

IN, nom

and IO=I

O, min

to I

O, max

Cout = 2 * 0.47μF ceramic capacitors)

RMS (5Hz to 20MHz bandwidth) All

Peak-to-Peak (5Hz to 20MHz bandwidth) All

External Capacitance

ESR ≥ 1 mΩ All C

ESR ≥ 10 mΩ All C

Output Current All I

Output Current Limit Inception (Hiccup Mode ) All I

Output Short-Circuit Current All I

(VO≤250mV) ( Hiccup Mode )

Efficiency V

VIN= V

IO=I

, TA=25°C V

IN, nom

= V

O, max , VO

V

O,set

V

= 0.8Vdc η 79.0 %

O,set

= 1.2Vdc η 84.7 %

O, set

= 1.5Vdc η 87.3 %

O,set

= 1.8Vdc η 88.9 %

O,set

= 2.0Vdc η 89.7 %

O,set

= 2.5Vdc η 91.4 %

O,set

= 3.3Vdc η 93.1 %

O,set

= 5.5Vdc η 95.1 %

O,set

Switching Frequency All f

O, max

o

O, lim

O, s/c

sw

Dynamic Load Response

(dIo/dt=5A/μs; VIN = V

IN, nom

; TA=25°C)

Load Change from Io= 50% to 100% of Io,max; No external output capacitors

All V

pk

Peak Deviation

Settling Time (Vo<10% peak deviation)

(dIo/dt=5A/μs; VIN = V

IN, nom

; TA=25°C)

Load Change from Io= 100% to 50%of Io,max: No external output capacitors

All t

All V

s

pk

Peak Deviation

Settling Time (Vo<10% peak deviation)

All t

s

-1.2

-3.0

⎯

+1.2 % V

+3.0 % V

0.7887 5.5 Vdc

⎯

0.01 0.1 % V

0.1 0.2 % V

5 15 mV

15 50 mV

⎯ ⎯

1000 μF

10,000 μF

0 25 Adc

⎯

125 150 % I

1

⎯

500

⎯

150 mV

25

⎯ μs

150 mV

25

⎯ μs

pk-pk

Adc

kHz

O, set

rms

o

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Data Sheet October 5, 2009

10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current

Naos

TM

NXA025 SMT Non-isolated Power Modules:

General Specifications

Parameter Min Typ Max Unit

Calculated MTBF (IO=80% of I

Weight

, TA=25°C) 2,150,000 Hours

O, max

⎯

15.5 (0.55)

⎯

g (oz.)

Feature Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.

Parameter Device Symbol Min Typ Max Unit

SEQ/ENA Signal Interface

(VIN=V

Signal referenced to GND)

Logic High (SEQ/ENA pin open – Module Off)

SEQ/ENA Current All I

SEQ/ENA Voltage: All V

Logic Low (Module ON)

SEQ/ENA Current: All I

SEQ/ENA Voltage: All V

Turn-On Delay and Rise Times All Tdelay ― 1 ― msec

(IO=I

Output voltage overshoot – Startup 0.1

IO=80% of I

Ouptut Overvoltage Protection (Latching) All 5.62 5.8 6.0 V

Input Undervoltage Lockout

Turn-on Threshold All

Turn-off Threshold All

Remote Sense Range ― ― 0.5 V Overtemperature Protection

(See Thermal Consideration section)

Forced Load Share Accuracy All

Number of units in Parallel

to V

IN, min

to within ±1% of steady state)

O, max , Vo

O, max

; open collector or equivalent,

IN, max

; VIN = 12Vdc, TA = 25 oC

SEQ/ENA

All Trise

All T

ref

0.5

3.5

⎯

2.33 mA

14 V

⎯ ⎯

― 5 ― msec

200 μA

1.2 V

0.5

9.9 V

8.1 V

⎯

125

⎯

10 % Io

5

% V

°C

O, set

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Data Sheet October 5, 2009

10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current

Naos

TM

NXA025 SMT Non-isolated Power Modules:

Characteristic Curves

The following figures provide typical characteristics for the NXA025A0X –S at 25ºC.

88%

87%

86%

85%

84%

83%

82%

81%

EFFICIENCY, η (%)

80%

0 5 10 15 2 0 2 5

Vin=13.2V

Vin=12.0V

Vin=10.8V

OUTPUT CURRENT, IO (A)

Figure 1. Converter Efficiency versus Output Current (Vout = 1.2Vdc).

91%

90%

89%

88%

87%

86%

85%

84%

EFFICIENCY, η (%)

83%

Vin=13.2V

Vin=12.0V

Vin=10.8V

0 5 10 15 2 0 2 5

OUTPUT CURRENT, IO (A)

Figure 2. Converter Efficiency versus Output Current (Vout = 1.5Vdc).

92%

91%

90%

89%

88%

87%

86%

EFFICIENCY, η (%)

85%

0 5 10 15 2 0 2 5

Vin=13.2V

Vin=12.0V

Vin=10.8V

94%

93%

92%

91%

90%

89%

EFFICIENCY, η (%)

88%

0 5 10 15 2 0 2 5

OUTPUT CURRENT, IO (A)

Figure 4. Converter Efficiency versus Output Current (Vout = 2.5Vdc).

95%

94%

93%

92%

91%

90%

89%

EFFICIENCY, η (%)

88%

0 5 10 15 2 0 2 5

OUTPUT CURRENT, IO (A)

Figure 5. Converter Efficiency versus Output Current (Vout = 3.3Vdc).

97%

96%

95%

94%

93%

92%

91%

90%

EFFICIENCY, η (%)

89%

0 5 10 15 2 0 2 5

Vin=13.2V

Vin=12.0V

Vin=10.8V

Vin=13.2V

Vin=12.0V

Vin=10.8V

Vin=13.2V

Vin=12.0V

Vin=10.8V

OUTPUT CURRENT, IO (A)

Figure 3. Converter Efficiency versus Output Current (Vout = 1.8Vdc).

Figure 6. Converter Efficiency versus Output Current (Vout = 5.0Vdc).

OUTPUT CURRENT, IO (A)

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Data Sheet

)

October 5, 2009

10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current

Naos

TM

NXA025 SMT Non-isolated Power Modules:

Characteristic Curves (continued)

The following figures provide typical characteristics for the NXA025A0X –S at 25ºC.

(V) (20mV/div)

O

V

OUTPUT VOLTAGE

(V) (50mV/div)

O

Figure 7. Typical Output Ripple and Noise (Vin = 12V

TIME, t (1μs/div

dc, Vo = 3.3 Vdc, Cout = 2x 0.47uF ceramic capacitor).

(V) (20mV/div)

O

V

OUTPUT VOLTAGE

TIME, t (1μs/div)

Figure 8. Typical Output Ripple and Noise (Vin = 12V dc, Vo = 1.2Vdc, Cout = 2x 0.47uF ceramic capacitor).

(V) (50mV/div)

O

(A) (5A/div) V

O

OUTPUT CURRENT, OUTPUT VOLTAGE

I

TIME, t (5 μs/div)

Figure 10. Transient Response to Dynamic Load Change from 100% to 50% of full load (Vo = 3.3Vdc).

(V) (2V/div)

IN

(V) (1V/div) V

o

OUTPUT VOLTAGE, INPUT VOLTAGE

V

TIME, t (0.5ms/div)

Figure 11. Typical Start-Up with application of Vin (Vo = 3.3Vdc).

(V) (2V/div)

On/off

(A) (5A/div) V

O

I

OUTPUT CURRENT OUTPUT VOLTAGE

TIME, t (5μs/div)

Figure 9. Transient Response to Dynamic Load Change from 50% to 100% of full load (Vo = 3.3Vdc).

V) (1V/div) V

O

OUTPUT VOLTAGE On/Off VOLTAGE

V

TIME, t (0.5ms/div)

Figure 12. Typical Start-Up Using Enable (Vo =

3.3Vdc).

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Data Sheet

,

October 5, 2009

10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current

Naos

TM

NXA025 SMT Non-isolated Power Modules:

Characteristic Curves (continued)

The following figures provide typical characteristics for the NXA025A0X –S at 25oC.

(V) (1V/div)

O

(V) (1V/div) V

O

Module # 1 Module #2

V

Figure 13. Synchronized Start-up of Output Voltage when SEQ/ENA pins are tied together (Module #1 =

1.5Vdc

Module #2 = 3.3Vdc).

TIME, t (1ms/div)

(V) (1V/div)

O

(V) (1V/div) V

O

V

Module # 1 Module #2

TIME, t (1ms/div)

Figure 14. Synchronized Shut-down of Output Voltage when SEQ/ENA pins are tied together (Module #1 =

1.5Vdc, Module #2 = 3.3Vdc).

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