Delta Electronics Delphi DNT04 User manual

Delphi DNT04, Non-Isolated Point of Load

DC/DC Power Modules: 2.4~5.5Vin, 0.75~3.63Vo, 3A out

The Delphi Series DNT04, 2.4-5.5V 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 DNT04 series provides a programmable outpu

voltage from 0.75V to 3.63V via external resistors. This product family is

available in surface mount or SIP package and provides up to 3A o

output current in an industry standard footprint. 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.

The DNT04, 3A modules have excellent thermal performance and can

provide full output current at up to 85℃ambient temperature with no

airflow.

OPTIONS

 Positive On/Off logic

 SMD or SIP package

APPLICATIONS

 Telecom/DataCom

 Distributed power architectures

 Servers and workstations

 LAN/WAN applications

 Data processing applications

FEATURES

 High Efficiency: 94%@ 5Vin, 3.3V/3A out

 Small size and low profile:

0.80” x 0.45” x 0.27” (SMD)

0.90” x 0.40” x 0.25” (SIP)

 Standard footprint and pinout

 Resistor-based trim

 Output voltage programmable from

0.75V to 3.63V via external resistors

 Pre-bias startup

 No minimum load required

 Fixed frequency operation

 Input UVLO, OCP

 Remote ON/OFF

 ISO 9001, TL 9000, ISO 14001, QS 9000,

OHSAS 18001 certified manufacturing

facility

 UL/cUL 60950 (US & Canada) Recognized,

and TUV (EN60950)- pending

 CE mark meets 73/23/EEC and 93/68/EEC-

pending

PRELIMINARY DATASHEET

DS_DNT04SIP03_09262007

DS_DNT04SIP3A_09262007

TECHNICAL SPECIFICATIONS

(TA = 25°C, airflow rate = 300 LFM, Vin = 2.4Vdc and 5.5Vdc, nominal Vout unless otherwise noted.)

PARAMETER NOTES and CONDITIONS DNT04S0A0R03NFA

Min. Typ. Max. Units

ABSOLUTE MAXIMUM RATINGS

Input Voltage (Continuous) 0 5.8 Vdc

Operating Temperature Refer to Figure 32 for measuring point -40 125 °C

Storage Temperature -55 125 °C

INPUT CHARACTERISTICS

Operating Input Voltage Vo ≦Vin

–

0.5V 2.4 5.5 V

Input Under-Voltage Lockout

Turn-On Voltage Threshold 2.1 V

Turn-Off Voltage Threshold 2.0 V

Maximum Input Current Vin=4.5V Vo=3.3V, Io=Io,max 2.5 A

No-Load Input Current 30 45 mA

Off Converter Input Current 1 m

Inrush Transient Vin=2.4V to 5.5V, Io=Io,min to Io,max 0.1 A2S

Recommended Input Fuse TBD A

OUTPUT CHARACTERISTICS

Output Voltage Set Point Vin=5V, Io=Io, max -2.0 Vo,set +2.0 % Vo,set

Output Voltage Adjustable Range 0.7525 3.63 V

Output Voltage Regulation

Over Line Vin=2.4V to 5.5V 0.3 % Vo,set

Over Load Io=Io,min to Io,max 0.4 % Vo,set

Over Temperature Ta=-40℃to 85℃0.4 % Vo,set

Total Output Voltage Range Over sample load, line and temperature -3.0 +3.0 % Vo,set

Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 25 50 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 10 15 mV

Output Current Range 0 3 A

Output Voltage Over-shoot at Start-up 5 % Vo,set

Output DC Current-Limit Inception 220 % Io

Output Short-Circuit Current (Hiccup Mode) Io,s/c 3 Adc (rms)

DYNAMIC CHARACTERISTICS

Dynamic Load Response 10µF Tantalum & 1µF Ceramic load cap, 2.5A/µs

Positive Step Change in Output Current 50% Io, max to 100% Io, max 220 mV

Negative Step Change in Output Current 100% Io, max to 50% Io, max 220 mV

Setting Time to 10% of Peak Devitation 25 µs

Turn-On Transient Io=Io.max

Start-Up Time, From On/Off Control Von/off, Vo=10% of Vo,set 7 ms

Start-Up Time, From Input Vin=Vin,min, Vo=10% of Vo,set 7 ms

Maximum Output Startup Capacitive Load Full load; ESR ≧1mΩ1000 µF

Full load; ESR ≧10mΩ3000 µF

EFFICIENCY

Vo=3.3V Vin=5V, 100% Load 94.0 %

Vo=2.5V Vin=5V, 100% Load 92.5 %

Vo=1.8V Vin=5V, 100% Load 90.0 %

Vo=1.5V Vin=5V, 100% Load 88.5 %

Vo=1.2V Vin=5V, 100% Load 87.0 %

Vo=0.75V Vin=5V, 100% Load 81.5 %

FEATURE CHARACTERISTICS

Switching Frequency 300 kHz

ON/OFF Control, (Negative logic)

Logic Low Voltage Module On, Von/off -0.2 0.3 V

Logic High Voltage Module Off, Von/off 2.5 Vin.max V

Logic Low Current Module On, Ion/off 10 µA

Logic High Current Module Off, Ion/off 0.2 1 mA

GENERAL SPECIFICATIONS

MTBF Io=100% of Io, max; Ta=25°C TBD M hours

Weight 2.3 grams

DS_DNT04SIP3A_09262007

ELECTRICAL CHARACTERISTICS CURVES

Figure 1: Converter efficiency vs. output current (5Vin/3.3Vout) Figure 2: Converter efficiency vs. output current (5Vin/2.5Vout)

Figure 3: Converter efficiency vs. output current (5Vin/1.8Vout) Figure 4: Converter efficiency vs. output current (5Vin/1.5Vout)

Figure 5: Converter efficiency vs. output current (5Vin/1.2Vout) Figure 6: Converter efficiency vs. output current (5Vin/0.75Vout)

DS_DNT04SIP3A_09262007

ELECTRICAL CHARACTERISTICS CURVES (CON.)

Figure 7: Output ripple & noise at 5Vin, 3.3V/3A out, 50mV/div Figure 8: Output ripple & noise at 5Vin, 2.5V/3A out, 50mV/div

Figure 9: Output ripple & noise at 5Vin, 1.8V/3A out, 50mV/div Figure 10: Output ripple & noise at 5Vin, 1.5V/3A out, 50mV/div

Figure 11: Output ripple & noise at 5Vin, 1.2V/3A out, 50mV/div Figure 12: Output ripple & noise at 5Vin, 0.75V/3A out, 50mV/div

DS_DNT04SIP3A_09262007

ELECTRICAL CHARACTERISTICS CURVES (CON.)

Figure 13: Turn on delay time at 5Vin, 3.3V/3A out

Top: Vout, 2V/div, Bottom: Vin, 5V/div; 2mS/div Figure 14: Turn on delay time at 5Vin, 2.5V/3A out

Top: Vout, 2V/div, Bottom: Vin, 5V/div; 2mS/div

Figure 15: Turn on delay time at 5Vin, 1.8V/3A out

Top: Vout, 1V/div, Bottom: Vin, 5V/div; 2mS/div

Figure 16: Turn on delay time at 5Vin, 1.5V/3A out

Top: Vout ,1V/div, Bottom: 5V/div; 2mS/div

Figure 17: Turn on delay time at 5Vin, 1.2V/3A out

Top: Vout , 1V/div, Bottom: Vin, 5V/div; 2mS/div Figure 18: Turn on delay time at 5Vin, 0.75V/3A out

Top: Vout, 0.5V/div, Bottom: Vin ,5V/div; 2mS/div

DS_DNT04SIP3A_09262007

ELECTRICAL CHARACTERISTICS CURVES

Figure 19: Typical transient response to step load change at

2.5A/µS from 100% to 50% of Io, max at 5Vin, 3.3Vout

(Cout = 1uF ceramic, 10µF tantalum), 0.1V/div

Figure 20: Typical transient response to step load change at

2.5A/µS from 50% to 100% of Io, max at 5Vin, 3.3Vout

(Cout =1uF ceramic, 10µF tantalum), 0.1V/div

Figure 21: Output short circuit current 5Vin, 0.75Vout

20A/div,10mS/div

Figure 22:Turn on with Prebias 5Vin, 3.3V/0A out, Vbias =1.0Vdc

2V/div,10mS/div

Vbias=1V

DS_DNT04SIP3A_09262007

DESIGN CONSIDERATIONS

Input Source Impedance

The power module should be connected to a low

ac-impedance input source. Highly inductive source

impedances can affect the stability of the module. An

input capacitance must be placed close to the modules

input pins to filter ripple current and ensure module

stability in the presence of inductive traces that supply

the input voltage to the module.

Safety Considerations

For safety-agency approval the power module must be

installed in compliance with the spacing and separation

requirements of the end-use safety agency standards.

For the converter output to be considered meeting the

requirements of safety extra-low voltage (SELV), the

input must meet SELV requirements. The power module

has extra-low voltage (ELV) outputs when all inputs are

ELV.

The input to these units is to be provided with a

adequate time-delay fuse in the ungrounded lead.

TEST CONFIGURATIONS

(+)

(-)

BATTERY

100uF

Tantalum

TO OSCILLOSCOPE

Note: Input reflected-ripple current is measured with a

simulated source inductance. Current is measured at the input

of the module.

Figure 23: Input reflected-ripple test setup

GND

COPPER STRIP

10uF

tantalum 1uF

ceramic SCOPE Resistive

Load

Note: Use a 10µF tantalum and 1µF capacitor. Scope

measurement should be made using a BNC connector.

Figure 24: Peak-peak output noise and startup transient

measurement test setup.

SUPPLY

GND

LOAD

CONTACT AND

DISTRIBUTION LOSSES

CONTACT RESISTANCE

Figure 25: Output voltage and efficiency measurement test

setup

Note: All measurements are taken at the module terminals.

When the module is not soldered (via socket), place

Kelvin connections at module terminals to avoid

measurement errors due to contact resistance.

%100)( ×

=IiVi IoVo

DS_DNT04SIP3A_09262007

FEATURES DESCRIPTIONS (CON.)

Over-Temperature Protection

The over-temperature protection consists of circuitry that

provides protection from thermal damage. If the

temperature exceeds the over-temperature threshold

the module will shut down. The module will try to restart

after shutdown. If the over-temperature condition still

exists during restart, the module will shut down again.

This restart trial will continue until the temperature is

within specification.

OutputVoltageProgramming

The output voltage of the DNT can be programmed to any

voltage between 0.75Vdc and 3.3Vdc by connecting one

resistor (shown as Rtrim in Figure 28) between the TRIM

and GND pins of the module. Without this external

resistor, the output voltage of the module is 0.7525 Vdc.

To calculate the value of the resistor Rtrim for a particular

output voltage Vo, please use the following equation:

Ω

⎥

⎦

⎤

⎢

⎣

⎡−

−

=5110

7525.0

21070

Rtrim

For example, to program the output voltage of the DNS

module to 1.8Vdc, Rtrim is calculated as follows:

Ω=Ω

⎥

⎦

⎤

⎢

⎣

⎡−

−

=KRtrim 155110

7525.08.1 21070

DNT can also be programmed by apply a voltage

between the TRIM and GND pins (Figure 29). The

following equation can be used to determine the value of

Vtrim needed for a desired output voltage Vo:

()

7525.01698.07.0 −×

−

VoVtrim

For example, to program the output voltage of a DNT

module to 3.3 Vdc, Vtrim is calculated as follows

()

VVtrim 267.07525.03.31698.07.0

−×

−

TRIM

GND

RLoad

Rtrim

Figure28: Circuit configuration for programming output voltage

using an external resistor

FEATURES DESCRIPTIONS

Remote On/Off

The DNT series power modules have an On/Off pin for

remote On/Off operation. Both positive and negative

On/Off logic options are available in the DNT series

power modules.

For positive logic module, connect an open collector

(NPN) transistor or open drain (N channel) MOSFET

between the On/Off pin and the GND pin (see figure 26).

Positive logic On/Off signal turns the module ON during

the logic high and turns the module OFF during the logic

low. When the positive On/Off function is not used, leave

the pin floating or tie to Vin (module will be On).

For negative logic module, the On/Off pin is pulled high

with an external pull-up resistor (see figure 27). Negative

logic On/Off signal turns the module OFF during logic

high and turns the module ON during logic low. If the

negative On/Off function is not used, leave the pin

floating or tie to GND. (module will be On)

On/Off

Vin

GND

ON/OFF

Figure 26: Positive remote On/Off implementation

On/Off

Vin

GND

Rpull-

ON/OFF

Figure 27: Negative remote On/Off implementation

Over-Current Protection

To provide protection in an output over load fault

condition, the unit is equipped with internal over-current

protection. When the over-current protection is

triggered, the unit enters hiccup mode. The units operate

normall

once the fault condition is removed.

DS_DNT04SIP3A_09262007

Figure 30: Circuit configuration for output voltage margining

On/Off

Vin

GND

Trim

Rmargin-up

Rmargin-down

Rtrim

TRIM

GND

RLoad

Vtrim

Figure 29: Circuit Configuration for programming output voltage

using external voltage source

The amount of power delivered by the module is the

voltage at the output terminals multiplied by the output

current. When using the trim feature, the output voltage of

the module can be increased, which at the same output

current would increase the power output of the module.

Care should be taken to ensure that the maximum output

power of the module must not exceed the maximum rated

power (Vo.set x Io.max ≤P max).

Voltage Margining

Output voltage margining can be implemented in the DNT

modules by connecting a resistor, R margin-up, from the Trim

pin to the ground pin for margining-up the output voltage

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

to the output pin for margining-down. Figure 30 shows the

circuit configuration for output voltage margining. If

unused, leave the trim pin unconnected.

calculation tool

is available from the evaluation procedure which

computes the values of R margin-up and Rmargin-down for a

specific output voltage and margin percentage.

FEATURE DESCRIPTIONS (CON.)

DS_DNT04SIP3A_09262007

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

Figure 31: Wind tunnel test setup

THERMAL CONSIDERATIONS

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 height of this fan duct is constantly kept at

25.4mm (1’’).

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.

DNT04S0A0R03(standard) Output Current vs. Ambient Temperature and Air Velocity

@Vin=5V Vout=0.75~3.3V (Through PCB Orientation)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

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

Natural

Convection

Output Current (A)

Ambient Temperature (℃)

Figure 33: Output current vs. ambient temperature and air

velocity @ Vin=5V, Vout=0.75V~3.3V(Through PCB Orientation)

THERMAL CURVES

Figure 32: Temperature measurement location

The allowed maximum hot spot temperature is defined at 125

℃

MODULE

IR FLOW

12.7 (0.5”)

50.8

(

2.0”

)

FACING PWB PWB

AIR VELOCITY

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

25.4 (1.0”)

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