Delta Electronics NC15 Series User manual

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
APPLICATIONS
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.
DATASHEET
DS_NC12S15A_01102008
 DataCom
 Distributed power architectures
 Servers and workstations
 LAN / WAN applications
 Data processing applications
OPTIONS
 Vertical or horizontal versions
 Negative ON/OFF logic

NC12S15A_01102008
2
TECHNICAL SPECIFICATIONS
(Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.)
PARAMETER NOTES and CONDITIONS NC12S0A0V/H15
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage 14 Vdc
Operating Temperature (Vertical) With appropriate air flow and derating, see Figs 33 0 130 °C
Operating Temperature (Horizontal) With appropriate air flow and derating, see Figs 39 0 125 °C
Storage Temperature -40 125 °C
Input/Output Isolation Voltage Non-isolated NA V
INPUT CHARACTERISTICS
Operating Input Voltage 10.2 12.0 13.8 V
Input Under-Voltage Lockout
Turn-On Voltage Threshold 9.0 V
Turn-Off Voltage Threshold 7.5 V
Lockout Hysteresis Voltage 1.5 V
Maximum Input Current 100% Load, 10.2Vin, 5.0Vout 8.1 A
No-Load Input Current Vin=12V, Vout=0.9V 65 mA
Off Converter Input Current Remote OFF 9 mA
Input Reflected-Ripple Current Refer to Figure 31. 150 mA
Input Ripple Rejection 120Hz 45 dB
OUTPUT CHARACTERISTICS
Output Voltage Adjustment Range 0.9 5.0 V
Output Voltage Set Point With a 1.0% trim resistor -2.5 +2.5 %
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, 100nF ceramic, 10µF tantalum 50 mV
RMS Full Load, 100nF ceramic, 10µF tantalum 20 mV
Output Current Range 0 15 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 Hiccup mode 16 A
Output Short-Circuit Current Hiccup mode
DYNAMIC CHARACTERISTICS
Output Dynamic Load Response 12Vin, 100nF ceramic, 10µF tantalum load cap, 10A/µs
Positive Step Change in Output Current 50% Io_max to 75% Io_max 100 mV
Negative Step Change in Output Current 75% Io_max to 50% Io_max 100 mV
Settling Time Settling to be within regulation band (Vo +/- 2.5%) 200 µs
Turn-On Transient
Start-Up Time, from On/Off Control From Enable high to 10% of Vo 10 ms
Start-Up Time, from input power From Vin=12V to 10% of Vo 10 ms
Minimum Output Capacitance Ex: OSCON 6.3V/680µF (ESR 13 mΩmax.) 680 µF
Maximum Output Startup Capacive Load Full Load 6800 µF
Minimum Input Capacitance Ex: OSCON 16V/270µF (ESR 18 mΩmax.) 270 µF
EFFICIENCY
Vo=0.9V Vin=12V, Io=15A 75 %
Vo=1.2V Vin=12V, Io=15A 79 %
Vo=1.5V Vin=12V, Io=15A 81 %
Vo=1.8V Vin=12V, Io=15A 84 %
Vo=2.5V Vin=12V, Io=15A 87 %
Vo=3.3V Vin=12V, Io=15A 89 %
Vo=5.0V Vin=12V, Io=15A 91 %
FEATURE CHARACTERISTICS
Switching Frequency fixed 300 KHz
ON/OFF Control Positive logic (internally pulled high)
Logic High Module On (or leave the pin open) 2.4 5.5 V
Logic Low Module Off 0 0.8 V
GENERAL SPECIFICATIONS
MTBF Telcordia SR-332 Issue1 Method1 Case3 at 50°C 2.1 M hours
Weight 16.5 grams

NC12S15A_01102008
3
ELECTRICAL CHARACTERISTICS CURVES
0
10
20
30
40
50
60
70
80
90
0123456789101112131415
Output Current (A)
Efficiency (%)
10.2 12 13.8
0
10
20
30
40
50
60
70
80
90
0123456789101112131415
Output Current (A)
Efficiency (%)
10.2 12 13.8
Figure 1: Converter efficiency vs. output current Figure 2: Converter efficiency vs. output current
(0.9V output voltage) (1.2V output voltage)
0
10
20
30
40
50
60
70
80
90
100
0123456789101112131415
Output Current (A)
Efficiency (%)
10.2 12 13.8
0
10
20
30
40
50
60
70
80
90
100
0123456789101112131415
Output Current (A)
Efficiency (%)
10.2 12 13.8
Figure 3: Converter efficiency vs. output current
(1.8V output voltage)
Figure 4: Converter efficiency vs. output current
(2.5V output voltage)
0
10
20
30
40
50
60
70
80
90
100
0123456789101112131415
Output Current (A)
Efficiency (%)
10.2 12 13.8
0
10
20
30
40
50
60
70
80
90
100
0123456789101112131415
Output Current (A)
Efficiency (%)
10.2 12 13.8
Figure 5: Converter efficiency vs. output current
(3.3V output voltage)
Figure 6: Converter efficiency vs. output current
(5.0V output voltage)

NC12S15A_01102008
4
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 9: Output ripple & noise at 12Vin, 1.8V/15A out Figure 10: Output ripple & noise at 12Vin, 2.5V/15A out
Figure 11: Output ripple & noise at 12Vin, 3.3V/15A out Figure 12: Output ripple & noise at 12Vin, 5.0V/15A out

NC12S15A_01102008
5
ELECTRICAL CHARACTERISTICS CURVES
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
Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 16: Turn on delay time at Remote On/Off, 2.5V/15A out Ch2:ENABLE Ch3:Vout Ch4:PWRGD
Figure 17: Turn on delay time at 12Vin, 5.0V/15A out
Ch2:Vin Ch3:Vout Ch4:PWRGD Figure 18: Turn on delay time at Remote On/Off, 5.0V/15A out Ch2:ENABLE Ch3:Vout Ch4:PWRGD

NC12S15A_01102008
6
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

NC12S15A_01102008
7
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 o
f
0.9Vdc to 5.0Vdc by a resistor from Trim pin to Ground.
The ENABLE (on/off) input allows external circuitry to pu
t
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 transisto
r
(Figure 24) or a logic gate (Figure 25). If the enable signal
comes from the secondary side, then an opto-coupler o
r
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
Ground
TrimEnable
Ground
Vin
Figure 23: Block Diagram Figure 24: Enable Input drive circuit for NC series
NC6A/15A/20A
Vout
Ground
TrimEnable
Ground
Vin
5V
Safety Considerations
It is recommended that the user to provide a ver
y
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.
Figure 25: Enable input drive circuit using logic gate.
NC6A/15A/20A
Vout
Ground
Trim
Enable
Ground
Vin
Figure 26: Enable input drive circuit example with isolation.

NC12S15A_01102008
8
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
9.0
1170
)( − =Ω Vout Rs
The input under-voltage lockout prevents the converte
r
from being damaged while operating when the inpu
t
voltage is too low. The lockout occurs between 7.0V to
8.0V.
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-curren
t
and short-circuit protection circuitry. When over curren
t
condition occurs, the module goes into the non-latching
hiccup mode. When the over-current condition is
removed, the module will resume normal operation.
OPEN+0.9 V
3.92K+1.2 V
+1.5 V 1.96K
+1.8 V 1.3K
+2.5 V 732
A
n 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.
+3.3 V 487
287+5.0 V
Figure 28: Typical trim resistor values
NC6A/15A/20A
Vout
Ground
Trim
Enable
Ground
Vin
1.3K
Rt
Rs
Vt
The detection of the Rds(on) of the high side MOSFE
T
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
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
To use voltage trim, the trim equation for the
NC6A/NC15A/ NC20A is (please refer to Fig. 29) :
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.
)9.0(17.1 )17.13.1(
)( −−
−
=Ω VoutRsVtRs kRt
NC6A/15A/20A
Rs
Vout
Ground
Trim
Enable
Ground
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)
Below is an example about using this voltage trim
equation :
Figure 27: Trimming Output Voltage
Example：
If Vt = 1.25V, desired Vout = 2.5V and Rs = 0.715KΩ
Ω=
−−
−
=Ω K
VoutRsVtRs
KRt 51.12
)9.0(17.1 )17.13.1(
)(

NC12S15A_01102008
9
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 fo
r
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% o
f
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 furthe
r
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 i
t
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
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.
Voltage Margining Adjustment
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 lowe
r
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.
NC6A/15A/20A
Vout
Ground
Trim
Enable
Ground
Vin Rmargin-dow
n
Rs
Vt
Rmargin-up
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
Figure 30: Circuit configuration for output voltage margining
Paralleling
NC06/NC15/NC20 converters do not have built-in curren
t
sharing (paralleling) ability. Hence, paralleling of multiple
NC06/NC15/NC20 converters is not recommended.

NC12S15A_01102008
10
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.

11
THERMAL CURVES (NC12S0A0V15)
MODULE
A
IR FLOW
17.5 (0.69”)
50.8 (2.0”)
FACING PWB PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
35 (1.38”)
NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 3.3V (Either Orientation)
0
3
6
9
12
15
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Current(A)
Ambient Temperature (℃)
100LFM
Natural
Convection
200LFM
300LFM
400LFM
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)
0
3
6
9
12
15
25 30 35 40 45 50 55 60 65 70 75 80 85
Output Current(A)
Ambient Temperature (℃)
100LFM
Natural
Convection
200LFM
300LFM
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
@ Vout = 5V (Either Orientation)
0
3
6
9
12
15
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (℃)
Output Current(A)
100LFM
Natural
Convection
200LFM
300LFM
400LFM
NC12S0A0V15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 0.9V (Either Orientation)
0
3
6
9
12
15
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (℃)
Output Current(A)
100LFM
Natural
Convection
200LFM
300LFM
Figure 37: Output current vs. ambient temperature and air
velocity@ Vout=0.9V(Either Orientation)
NC12S15A_01102008
Figure 34: Output current vs. ambient temperature and air
velocity@Vout=5V(Either Orientation)

NC12S15A_01102008
12
THERMAL CURVES (NC12S0A0H15)
19 (0.75”)
MODULE
A
IR FLOW
9.5 (0.37”)
50.8 (2.0”)
FACING PWB PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =3.3V (Either Orientation)
0
3
6
9
12
15
25 35 45 55 65 75 85
Output Current(A)
Ambient Temperature (℃)
100LFM
Natural
Convection
200LFM
300LFM
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)
0
3
6
9
12
15
25 35 45 55 65 75 85
Ambient Temperature (℃)
Output Current(A)
100LFM
Natural
Convection
200LFM
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
@ Vout =5V (Either Orientation)
0
3
6
9
12
15
25 35 45 55 65 75 85
Ambient Temperature (℃)
Output Current(A)
100LFM
Natural
Convection
200LFM
300LFM
400LFM
NC12S0A0H15 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =0.9V (Either Orientation)
0
3
6
9
12
15
25 35 45 55 65 75 85
Ambient Temperature (℃)
Output Current(A)
100LFM
Natural
Convection
200LFM
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)

NC12S15A_01102008
13
MECHANICAL DRAWING
VERTICAL HORIZONTAL

NC12S15A_01102008
14
PART NUMBERING SYSTEM
MODEL LIST
Model Name Packaging Input Voltage Output Voltage Output Current Efficiency
12Vin @ 100% load
NC12S0A0V15PNFA Vertical 10.2 ~ 13.8Vdc 0.9 V ~ 5.0Vdc 15A 91% (5.0V)
NC12S0A0H15PNFA Horizontal 10.2 ~ 13.8Vdc 0.9 V ~ 5.0Vdc 15A 91% (5.0V)
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]
Email: [email protected]
Europe:
Telephone: [phone]
Fax: [phone]
Email: [e-mail]
Asia & the rest of world:
Telephone: [phone] x6220
Fax: [phone]
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.
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-
Non-isolated
Converter
12-
10.2~13.8V
S- Single
output
0A0-
programmable
H- Horizontal
V- Vertical
15 - 15A P- Positive
N- Negative
R- 0.118”
N- 0.14”
F- RoHS 6/6
(Lead Free)
A- Standard
function.