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
Delphi NC15 Series Non-Isolated Point of Load
DC/DC Power Modules: 12Vin, 0.9V-5.0Vout, 15A
OPTIONS
ꢀ
ꢀ
Vertical or horizontal versions
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.
Negative ON/OFF logic
APPLICATIONS
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
DataCom
Distributed power architectures
Servers and workstations
LAN / WAN applications
Data processing applications
DATASHEET
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ELECTRICAL CHARACTERISTICS CURVES
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
10
0
10.2
5
12
9
13.8
10.2
5
12
9
13.8
10
0
0
1
2
3
4
6
7
8
10 11 12 13 14 15
0
1
2
3
4
6
7
8
10 11 12 13 14 15
Output Current (A)
Output Current (A)
Figure 1: Converter efficiency vs. output current
Figure 2: Converter efficiency vs. output current
(0.9V output voltage)
(1.2V output voltage)
100
90
80
70
60
50
40
30
20
100
90
80
70
60
50
40
30
20
10.2
5
12
9
13.8
10.2
5
12
9
13.8
10
0
10
0
0
1
2
3
4
6
7
8
10 11 12 13 14 15
0
1
2
3
4
6
7
8
10 11 12 13 14 15
Output Current (A)
Output Current (A)
Figure 3: Converter efficiency vs. output current
Figure 4: Converter efficiency vs. output current
(1.8V output voltage)
(2.5V output voltage)
100
90
80
70
60
50
40
30
20
100
90
80
70
60
50
40
30
20
10.2
5
12
9
13.8
10.2
5
12
9
13.8
10
0
10
0
0
1
2
3
4
6
7
8
10 11 12 13 14 15
0
1
2
3
4
6
7
8
10 11 12 13 14 15
Output Current (A)
Output Current (A)
Figure 5: Converter efficiency vs. output current
Figure 6: Converter efficiency vs. output current
(3.3V output voltage)
(5.0V output voltage)
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ELECTRICAL CHARACTERISTICS CURVES
Figure 7: Output ripple & noise at 12Vin, 0.9V/15A out
Figure 8: Output ripple & noise at 12Vin, 1.2V/15A out
Figure 10: Output ripple & noise at 12Vin, 2.5V/15A out
Figure 12: Output ripple & noise at 12Vin, 5.0V/15A out
Figure 9: Output ripple & noise at 12Vin, 1.8V/15A out
Figure 11: Output ripple & noise at 12Vin, 3.3V/15A out
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ELECTRICAL CHARACTERISTICS CURVES
Figure 13: Turn on delay time at 12Vin, 0.9V/15A out
Figure 14: Turn on delay time Remote On/Off, 0.9V/15A out
Ch2:Vin Ch3:Vout Ch4:PWRGD
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
Ch2:Vin Ch3:Vout Ch4:PWRGD
Ch2:ENABLE Ch3:Vout Ch4:PWRGD
Figure 17: Turn on delay time at 12Vin, 5.0V/15A out
Figure 18: Turn on delay time at Remote On/Off, 5.0V/15A out
Ch2:Vin Ch3:Vout Ch4:PWRGD
Ch2:ENABLE Ch3:Vout Ch4:PWRGD
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ELECTRICAL CHARACTERISTICS CURVES
Figure 19: Typical transient response to step load change at
10A/μS from 50% to 75% and 75% to 50% of Io_max at
12Vin, 0.9V out
Figure 20: Typical transient response to step load change at
10A/μS from 50% to 75% and 75% to 50% of Io_max at
12Vin, 1.2V out
Figure 21: Typical transient response to step load change at
10A/μS from 50% to 75% and 75% to 50% of Io_max at
12Vin, 2.5V out
Figure 22: Typical transient response to step load change at
10A/μS from 50% to 75% and 75% to 50% of Io_max at
12Vin, 5.0V out
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DESIGN CONSIDERATIONS
FEATURES DESCRIPTIONS
ENABLE (On/Off)
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 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.
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.
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 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 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).
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.
NC6A/15A/20A
Vout
Vin
Enable
Ground
Trim
Ground
Figure 23: Block Diagram
Figure 24: Enable Input drive circuit for NC series
NC6A/15A/20A
5V
Vout
Vin
Safety Considerations
Enable
Trim
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
Ground
Figure 25: Enable input drive circuit using logic gate.
NC6A/15A/20A
Vout
Vin
Enable
Trim
Ground
Ground
Figure 26: Enable input drive circuit example with isolation.
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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 :
FEATURES DESCRIPTIONS (CON.)
Input Under-Voltage Lockout
1170
Rs(Ω) =
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.
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
Over-Current and Short-Circuit Protection
Output Voltage
Rs (Ω)
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.
+0.9 V
+1.2 V
+1.5 V
+1.8 V
+2.5 V
+3.3 V
+5.0 V
OPEN
3.92K
1.96K
1.3K
732
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.
487
287
Figure 28: Typical trim resistor values
NC6A/15A/20A
Vout
Vin
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.
1.3K
Trim
Rt
Vt
Enable
Rs
Ground
Ground
Output Voltage Programming
Figure 29: Output voltage trim with voltage source
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.
To use voltage trim, the trim equation for the
NC6A/NC15A/ NC20A is (please refer to Fig. 29) :
Rs(1.3Vt −1.17)
Rt(kΩ) =
1.17 − Rs(Vout − 0.9)
NC6A/15A/20A
Vout
Vin
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)
Trim
Enable
Rs
Below is an example about using this voltage trim
equation :
Ground
Ground
Figure 27: Trimming Output Voltage
Example：
If Vt = 1.25V, desired Vout = 2.5V and Rs = 0.715KΩ
Rs(1.3Vt −1.17)
1.17 − Rs(Vout − 0.9)
Rt(KΩ) =
= 12.51KΩ
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FEATURES DESCRIPTIONS (CON.)
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, an external 6.3V/680μF
low ESR capacitor (for example, OSCON) is required for
stable operation.
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.
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.
The power good signal is pulled low when output is not
within ±10% of Vout or Enable is OFF.
Current Sink Capability
Please refer to individual datasheet for the maximum
allowed start-up load capacitance for each NC series as it
is varied between series.
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.
Reflected Ripple Current and Output Ripple and
Noise Measurement
Voltage Margining Adjustment
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.
Output voltage margin adjusting can be implemented in
the NC modules by connecting a resistor, Rmargin-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, Rmargin-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
Rmargin-down
Rmargin-up
Vin
Trim
Enable
Rs
Cs=270μF*1, Ltest=1.4μH, Cin=270μF*1, Cout=680μF *1
Ground
Ground
Figure 31: Input reflected ripple/ capacitor ripple current and
output voltage ripple and noise measurement setup for NC15
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.
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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.
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THERMAL CURVES (NC12S0A0V15)
NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 3.3V (Either Orientation)
PWB
FACING PWB
Output Current(A)
15
12
9
MODULE
Natural
Convection
100LFM
200LFM
300LFM
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
6
50.8 (2.0”)
400LFM
AIR FLOW
3
0
17.5 (0.69”)
35 (1.38”)
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 35: Output current vs. ambient temperature and air
velocity@ Vout=3.3V(Either Orientation)
Note: Wind Tunnel Test Setup Figure Dimensions are in
millimeters and (Inches)
Figure 32: Wind tunnel test setup
NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 1.8V (Either Orientation)
Output Current(A)
15
12
Natural
Convection
9
100LFM
200LFM
6
300LFM
3
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 36: Output current vs. ambient temperature and air
velocity@ Vout=1.8V(Either Orientation)
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
NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 0.9V (Either Orientation)
@ Vout = 5V (Either Orientation)
Output Current(A)
Output Current(A)
15
12
15
12
Natural
Natural
Convection
9
Convection
9
100LFM
100LFM
200LFM
200LFM
6
6
300LFM
300LFM
400LFM
3
0
3
0
25
30
35
40
45
50
55
60
65
70
75
80
85
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Ambient Temperature (℃)
Figure 37: Output current vs. ambient temperature and air
Figure 34: Output current vs. ambient temperature and air
velocity@ Vout=0.9V(Either Orientation)
velocity@Vout=5V(Either Orientation)
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THERMAL CURVES (NC12S0A0H15)
NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =3.3V (Either Orientation)
PWB
FACING PWB
Output Current(A)
15
12
9
MODULE
Natural
Convection
AIR VELOCITY
100LFM
200LFM
300LFM
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
6
50.8 (2.0”)
AIR FLOW
3
0
25
35
45
55
65
75
85
9.5 (0.37”)
19 (0.75”)
Ambient Temperature (℃)
Figure 41: Output current vs. ambient temperature and air
velocity@ Vout=3.3V(Either Orientation)
Note: Wind Tunnel Test Setup Figure Dimensions are in
millimeters and (Inches)
Figure 38: Wind tunnel test setup
NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =1.8V (Either Orientation)
Output Current(A)
15
12
9
Natural
Convection
100LFM
200LFM
6
3
0
25
35
45
55
65
75
85
Ambient Temperature (℃)
Figure 42: Output current vs. ambient temperature and air
velocity@ Vout=1.8V(Either Orientation)
Figure 39: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 125℃
NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =0.9V (Either Orientation)
Output Current(A)
@ Vout =5V (Either Orientation)
Output Current(A)
15
12
9
15
12
9
Natural
Convection
Natural
Convection
100LFM
200LFM
100LFM
200LFM
300LFM
400LFM
6
6
3
3
0
0
25
35
45
55
65
75
85
25
35
45
55
65
75
85
Ambient Temperature (℃)
Ambient Temperature (℃)
Figure 43: Output current vs. ambient temperature and air
velocity@ Vout=0.9V(Either Orientation)
Figure 40: Output current vs. ambient temperature and air
velocity @Vout=5V(Either Orientation)
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MECHANICAL DRAWING
VERTICAL
HORIZONTAL
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PART NUMBERING SYSTEM
NC
12
S
0A0
V
15
P
N
F
A
Product
Series
Input
Voltage
Number of
outputs
Output
Voltage
Output
Current
ON/OFF
Logic
Pin
Length
Option
Code
Mounting
NC-
12-
S- Single
0A0-
H- Horizontal 15 - 15A
V- Vertical
P- Positive R- 0.118”
N- Negative N- 0.14”
F- RoHS 6/6 A- Standard
(Lead Free) function.
Non-isolated 10.2~13.8V output
Converter
programmable
MODEL LIST
Efficiency
12Vin @ 100% load
Model Name
Packaging
Input Voltage
Output Voltage Output Current
NC12S0A0V15PNFA
NC12S0A0H15PNFA
Vertical
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)
Horizontal
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
Email: [email protected]
Email: [email protected]
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.
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