Delta Electronics Delphi NC30 Manuale utente

DATASHEET

DS_NC12S30A_05222008

FEATURES

High efficiency:

94% @ 12Vin, 5V/30A out

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 OVP, OTP, OCP, SCP

Remote ON/OFF (default: positive)

Power good output signal

Output voltage sense

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

OHSAS 18001 certified manufacturing

facility

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

and TUV (EN60950) Certified

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

directives

APPLICATIONS

DataCom

Distributed power architectures

Servers and workstations

LAN / WAN applications

Data processing applications

OPTIONS

Vertical or horizontal versions

Negative On/Off logic

Delphi NC30 Series Non-Isolated Point of Load

DC/DC Power Modules: 12Vin, 0.9V-5Vout, 30A

The Delphi NC30 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 NC30 series operates from a 12V nominal input, provides up

to 30A 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. NC30 series has built-in current sharing control and

multiple NC30/NC40 series modules could be paralleled together to

provide even higher output currents. NC30 series 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.

DS_NC12S30A_05222008

TECHNICAL SPECIFICATIONS

(TA=25°C, airflow rate=400LFM, Vin=12Vdc, nominal Vout unless otherwise noted.)

PARAMETER NOTES and CONDITIONS NC12S0A0V30

Min. Typ. Max. Units

ABSOLUTE MAXIMUM RATINGS

Input Voltage 14 Vdc

Operating Temperature Refer to Figures 36 and 41 for the measuring point -40 125 °C

Storage Temperature -40 125 °C

Input/Output Isolation Voltage Non-isolated NA V

INPUT CHARACTERISTICS

Operating Input Voltage 10.2 12 13.8 V

Input Under-Voltage Lockout

Turn-On Voltage Threshold 9.0 V

Turn-Off Voltage Threshold 8.3 V

Lockout Hysteresis Voltage 0.7 V

Maximum Input Current 100% Load, 10.2Vin, 5Vout 15.6 A

No-Load Input Current 160 mA

Off Converter Input Current 10 mA

Input Reflected-Ripple Current Refer to Figure 35 150 mA

Input Voltage Ripple Rejection 120 Hz 55 dB

OUTPUT CHARACTERISTICS

Output Voltage Adjustment Range 0.9 5.0 V

Output Voltage Set Point Vin=12V, Io=Io,max, Ta=25℃, 1% trim resistors -3.0 +3.0 %

Output Voltage Regulation

Over Load Io=Io,min to Io,max -1.0 +1.0 %

Over Line Vin=Vin,min to Vin,max -0.2 +0.2 %

Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

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

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

Output Current Range 0 30 A

Output Voltage Over-shoot at Start-up Vin=12V, Turn ON 1 %

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

Output DC Current-Limit Inception 36

Output Short-Circuit Current (Hiccup mode) 36 A

DYNAMIC CHARACTERISTICS

Out Dynamic Load Response 12Vin, 10µF Tan & 1µF Ceramic load cap, 10A/µs

Positive Step Change in Output Current 50% Io,max to 75% Io,max 75 mV

Negative Step Change in Output Current 75% Io,max to 50% Io,max 75 mV

Setting Time Settling to be within regulation band (+/- 3.0%) 150 µs

Turn-On Transient Io=Io.max

Start-Up Time, From On/Off Control Vin=12V, Vo=10% of Vo,set, Ta=25℃10 ms

Start-Up Time, From Input Vo=10% of Vo,set, Ta=25℃30 ms

Minimum Output Startup Capacitive Load Ex: Two OSCON 6.3V/680µF (ESR 13mΩmax each) 1360

Maximum Output Startup Capacitive Load Full load; ESR ≧10mΩ5440 µF

Minimum Input Capacitance Ex: OSCON 16V/270µF (ESR 18mΩmax) 270 µF

EFFICIENCY

Vo=0.9V Vin=12V, Io=30A 78 %

Vo=1.2V Vin=12V, Io=30A 82 %

Vo=1.5V Vin=12V, Io=30A 85 %

Vo=1.8V Vin=12V, Io=30A 87 %

Vo=2.5V Vin=12V, Io=30A 90 %

Vo=3.3V Vin=12V, Io=30A 92 %

Vo=5.0V Vin=12V, Io=30A 94 %

FEATURE CHARACTERISTICS

Switching Frequency 300 KHz

ON/OFF Control Positive logic (internally pulled high)

Logic High Module On (or leave the pin open) 2.4 Vin,max V

Logic Low Module Off -0.2 0.8 V

Remote Sense Range 0.4 V

GENERAL SPECIFICATIONS

MTBF 1.69 M hours

Weight 36 grams

Over-Temperature Shutdown Auto restart, refer to Fig. 36&41 for the measuring point 130 °C

DS_NC12S30A_05222008

ELECTRICAL CHARACTERISTICS CURVES

100

0 2 4 6 8 1012141618202224262830

Output Current (A)

Efficiency (%)

10.2 12 13.8

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

Output Current (A)

Efficiency (%)

10.2 12 13.8

Figure 1: Converter efficiency vs. output current

(0.9V output voltage)

Figure 2: Converter efficiency vs. output current

(1.2V output voltage)

100

0 2 4 6 8 1012141618202224262830

Output Current (A)

Efficiency (%)

10.2 12 13.8

100

0 2 4 6 8 101214161820222426283

Output Current (A)

Efficiency (%)

10.2 12 13.8

Figure 3: Converter efficiency vs. output current

(1.5V output voltage) Figure 4: Converter efficiency vs. output current

(1.8V output voltage)

100

0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30

Output Current (A)

Efficiency (%)

10.2 12 13.8

100

0 2 4 6 8 1012141618202224262830

Output Current (A)

Efficiency (%)

10.2 12 13.8

Figure 5: Converter efficiency vs. output current

(2.5V output voltage)

Figure 6: Converter efficiency vs. output current

(3.3V output voltage)

DS_NC12S30A_05222008

ELECTRICAL CHARACTERISTICS CURVES (CON.)

100

120

0 2 4 6 8 1012141618202224262830

Output Current (A)

Efficiency (%)

10.2 12 13.8

Figure 7: Converter efficiency vs. output current

(5.0V output voltage)

Figure 8: Output ripple & noise at 12Vin, 0.9V/30A out

Figure 9: Output ripple & noise at 12Vin, 1.2V/30A out Figure 10: Output ripple & noise at 12Vin, 1.5V/30A out

Figure 11: Output ripple & noise at 12Vin, 1.8V/30A out

Figure 12: Output ripple & noise at 12Vin, 2.5V/30A out

DS_NC12S30A_05222008

ELECTRICAL CHARACTERISTICS CURVES (CON.)

Figure 13: Output ripple & noise at 12Vin, 3.3V/30A out Figure 14: Output ripple & noise at 12Vin, 5.0V/30A out

Figure 15: Turn on delay time at Vin On/Off, 0.9V/30A out

Ch2:Vin Ch3:Vout Ch4:PWRGD

Figure 16:Turn on delay time at Remote On/Off, 0.9V/30A out

Ch2:ENABLE Ch3:Vout Ch4:PWRGD

Figure 17: Turn on delay time at 12vin, 5.0V/30A out

Ch2:Vin Ch3:Vout Ch4:PWRGD

Figure 18: Turn on delay time at Remote On/Off, 5.0V/30A out

Ch2: ENABLE Ch3:Vout Ch4:PWRGD

DS_NC12S30A_05222008

ELECTRICAL CHARACTERISTICS CURVES (CON.)

Figure 19: Typical transient response to step load change at

10A/μS from 75% to 50% of Io, max at 12Vin, 1.2V out (Cout =

1uF ceramic, 10μF tantalum)

Figure 20: Typical transient response to step load change at

10A/μS from 75% to 50% of Io, max at 12Vin, 1.5V out (Cout =

1uF ceramic, 10μF tantalum)

Figure 21: Typical transient response to step load change at

10A/μS from 75% to 50% of Io, max at 12Vin, 1.8V out (Cout =

1uF ceramic, 10μF tantalum)

Figure 22: Typical transient response to step load change at

10A/μS from 75% to 50% of Io, max at 12Vin, 2.5V out (Cout =

1uF ceramic, 10μF tantalum)

Figure 23: Typical transient response to step load change at

10A/μS from 75% to 50% of Io, max at 12Vin, 3.3V out (Cout =

1uF ceramic, 10μF tantalum)

Figure 24: Typical transient response to step load change at

10A/μS from 75% to 50% of Io, max at 12Vin, 5.0V out (Cout =

1uF ceramic, 10μF tantalum)

DS_NC12S30A_05222008

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 26, 27 and 28. 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) or a logic gate (Figure 27). 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 28).

NC30/NC40

Vout

Ground

TrimEnable

Ground

Vin

Figure 26: Enable Input drive circuit for NC series

NC30/NC40

Vout

Ground

TrimEnable

Ground

Vin

Figure 27: Enable input drive circuit using logic gate.

NC30/NC40

Vout

Ground

Trim

Enable

Ground

Vin

Figure 28: Enable input drive circuit example with isolation.

DESIGN CONSIDERATIONS

The NC30 is designed using two-phase synchronous

buck topology. Block diagram of the converter is shown in

Figure 25. The output can be trimmed in the range of

0.9Vdc to 5.0Vdc by a resistor from trim pin to ground. A

remote sense function is provided and it is able to

compensate for a drop from the output of converter to

point of load.

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.

The converter has an over temperature protection which

can protect itself by shutting down for an over

temperature event. There is a thermal hysteresis of

typically 30℃

Figure 25: Block Diagram

Safety Considerations

It is recommended that the user to provide two 12A very

fast-acting type fuses (Little fuse R451 012) in parallel in

the input line for safety.

DS_NC12S30A_05222008

Over Temperature Protection (OTP)

To provide additional over-temperature protection in a

fault condition, the unit is equipped with a non-latching

thermal shutdown circuit. The shutdown circuit engages

when the temperature of monitored component exceeds

approximately 130℃. The unit will cycle on and off while

the fault condition exists. The unit will recover from

shutdown when the cause of the over temperature

condition is removed.

Over Voltage Protection (OVP)

The converter will shut down when an output over voltage

is detected. Once the OVP condition is detected, the

controller will stop all PWM outputs and will turn on

low-side MOSFET driver to prevent any damage to load.

Current Sharing (optional)

The parallel operation of multiple converters is available

with the NC30/NC40 (option code B). The converters will

current share to be within +/- 10% of each other. In

addition to connect the I-Share pin together for the current

sharing operation, the remote sense lines of the

paralleled units must be connected at the same point for

proper operation. Also, units are intended to be turned

on/enabled at the same time. Hot plugging is not

recommended. The current sharing diagram show in

Figure 30.

C30A/40A

HARE

out

SENSE

ROUND

RIM

C30A/40A

Cout

RIM

Cout

SENSE

OAD

ENSE

out

Figure 30: NC30/NC40 Current Sharing Diagram

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 7.7V to

8.6V.

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.

The unit will not be damaged in an over current condition

because it will be protected by the over temperature

protection.

Remote Sense

The NC30/NC40 provide Vo remote sensing to achieve

proper regulation at the load points and reduce effects

of distribution losses on output line. In the event of an

open remote sense line, the module shall maintain local

sense regulation through an internal resistor. The

module shall correct for a total of 0.4V of loss. The

remote sense connects as shown in Figures 29.

-SENSE

GROUND

Contact and Distribution

Losses

VIN

+SENSE

GROUND

oRload

Figure 29: Circuit configuration for remote sense

DS_NC12S30A_05222008

FEATURES DESCRIPTIONS (CON.)

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 31 and the typical trim

resistor values are shown in Figure 32. The output can

also be set by an external voltage connected to trim pin as

shown in Figure 32.

The NC30A/40A module has a trim range of 0.9V to

5.0V. A plot of trim behavior is shown in Figure 33

Cout

-SENSE

+SENSE

GROUND

Vout

TRIM

Figure 31: Trimming Output Voltage

The NC30/NC40 modules have a trim range of 0.9V to

5.0V. The trim resistor equation for the them is :

Rs (kΩ) = 9.0

69.12

−

Vout Vout

Vout is the desired voltage setpoint,

Rs is the trim resistance between TRIM and Ground,

Rs values should not be less than 1.8 kΩ

Output Voltage Rs(Ω)

+0.9 V OPEN

+1.2 V 38.3K

+1.5 V 18.7K

+1.8 V 12.1K

+2.5 V 6.34K

+3.3 V 3.92K

+5.0 V 1.87K

Figure 32: Typical trim resistor values

Cout

-SENSE

+SENSE

GROUND

Vout

TRIM

Figure 33: Output voltage trim with voltage source

To use voltage trim, the trim equation for the NC30 is (please

refer to Fig. 33) :

69.12)1(9.0 )69.121.13(

)( ++−

−

=Ω RsVoutRs VoutVtRs

kRt

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 = 1 kΩ

Ω=

++−

−

=Ω k

RsVoutRs VoutVtRs

kRt 72.0

69.12)1(9.0 )69.121.13(

)(

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.

Output Capacitance

There is no output capacitor on the NC series modules.

Hence, an external output capacitor is required for stable

operation. For NC30 modules, two external 6.3V/680μF

output low ESR capacitors in parallel (for example, OSCON)

are 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.

DS_NC12S30A_05222008

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.

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.

The maximum acceptable temperature measured at

the thermal reference point is 125℃.This is shown in

Figure 36 & 41.

FEATURES DESCRIPTIONS (CON.)

Voltage Margining

Output voltage margining can be implemented in the

NC30/NC40 modules by connecting a resistor, R margin-up,

from the Trim pin to the ground pin 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 output pin. Figure 34 shows the circuit

configuration for output voltage margining adjustment.

Cout

Rmargin-down

-SENSE

Rmargin-up

+SENSE

GROUND

Vout

TRIM

Figure 34: Circuit configuration for output voltage margining

Reflected Ripple Current and Output Ripple and

Noise Measurement

The measurement set-up outlined in Figure 35 has been

used for both input reflected/ terminal ripple current and

output voltage ripple and noise measurements on NC

series converters.

Cs=270uF*1 Ltest=1.4uH Cin=270uF*1 Cout=680uF*2

Figure 35:Input reflected ripple/ capacitor ripple current and

output voltage ripple and noise measurement setup for NC30

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