FEATURES
Š
High efficiency:
94% @ 12Vin, 5V/30A out
Š
Š
Š
Voltage and resistor-based trim
No minimum load required
Output voltage programmable from
0.9Vdc to 5.0Vdc via external resistors
Fixed frequency operation
Š
Š
Š
Š
Š
Š
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
Š
Š
UL/cUL 60950 (US & Canada) Recognized,
and TUV (EN60950) Certified
CE mark meets 73/23/EEC and 93/68/EEC
directives
Delphi NC30 Series Non-Isolated Point of Load
DC/DC Power Modules: 12Vin, 0.9V-5Vout, 30A
OPTIONS
Š
Š
Vertical or horizontal versions
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.
Negative On/Off logic
APPLICATIONS
Š
Š
Š
Š
Š
DataCom
Distributed power architectures
Servers and workstations
LAN / WAN applications
Data processing applications
DATASHEET
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ELECTRICAL CHARACTERISTICS CURVES
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
10.2
12
13.8
10.2
12
13.8
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
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
12
13.8
10.2
12
13.8
10
0
10
0
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
Output Current (A)
Output Current (A)
Figure 3: Converter efficiency vs. output current
Figure 4: Converter efficiency vs. output current
(1.5V output voltage)
(1.8V output voltage)
100
90
80
70
60
50
40
30
20
100
90
80
70
60
50
40
30
20
10.2
12
13.8
10.2
12
13.8
10
0
10
0
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
Output Current (A)
Output Current (A)
Figure 5: Converter efficiency vs. output current
Figure 6: Converter efficiency vs. output current
(2.5V output voltage)
(3.3V output voltage)
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ELECTRICAL CHARACTERISTICS CURVES (CON.)
120
100
80
60
40
20
10.2
12
13.8
0
0
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30
Output Current (A)
Figure 7: Converter efficiency vs. output current
Figure 8: Output ripple & noise at 12Vin, 0.9V/30A out
(5.0V output voltage)
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
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ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 14: Output ripple & noise at 12Vin, 5.0V/30A out
Figure 13: Output ripple & noise at 12Vin, 3.3V/30A out
Figure 15: Turn on delay time at Vin On/Off, 0.9V/30A out
Figure 16:Turn on delay time at Remote On/Off, 0.9V/30A out
Ch2:Vin Ch3:Vout Ch4:PWRGD
Ch2:ENABLE Ch3:Vout Ch4:PWRGD
Figure 17: Turn on delay time at 12vin, 5.0V/30A out
Figure 18: Turn on delay time at Remote On/Off, 5.0V/30A out
Ch2:Vin Ch3:Vout Ch4:PWRGD
Ch2: ENABLE Ch3:Vout Ch4:PWRGD
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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)
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FEATURES DESCRIPTIONS
DESIGN CONSIDERATIONS
ENABLE (On/Off)
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 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 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 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).
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.
NC30/NC40
Vout
Vin
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℃
Enable
Ground
Trim
Ground
Figure 26: Enable Input drive circuit for NC series
NC30/NC40
5V
Vout
Vin
Enable
Trim
Ground
Ground
Figure 27: Enable input drive circuit using logic gate.
Figure 25: Block Diagram
NC30/NC40
Vout
Vin
Safety Considerations
Enable
Trim
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.
Ground
Ground
Figure 28: Enable input drive circuit example with isolation.
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FEATURES DESCRIPTIONS (CON.)
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.
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
Over Voltage Protection (OVP)
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.
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.
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.
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.
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.
NC30A/40A
Vout
Cout
+SENSE
-SENSE
GROUND
I-SHARE
LOAD
VIN
Vo
TRIM
o
o
+SENSE
NC30A/40A
0
Cout
GROUND
Vout
R
load
+SENSE
-SENSE
GROUND
-SENSE
GROUND
Contact and Distribution
Losses
I-SHARE
TRIM
Figure 29: Circuit configuration for remote sense
0
Figure 30: NC30/NC40 Current Sharing Diagram
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To use voltage trim, the trim equation for the NC30 is (please
refer to Fig. 33) :
FEATURES DESCRIPTIONS (CON.)
Output Voltage Programming
Rs(13.1Vt +Vout −12.69)
Rt(kΩ) =
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.
0.9Rs −Vout(Rs +1) +12.69
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)
The NC30A/40A module has a trim range of 0.9V to
5.0V. A plot of trim behavior is shown in Figure 33
Below is an example about using this voltage trim equation :
Example：
+SENSE
Vout
Cout
If Vt = 1.25V, desired Vout = 2.5V and Rs = 1 kΩ
GROUND
-SENSE
Rs(13.1Vt +Vout −12.69)
0.9Rs −Vout(Rs +1) +12.69
Rt(kΩ) =
= 0.72kΩ
Rs
TRIM
Power Good
Figure 31: Trimming Output Voltage
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.
The NC30/NC40 modules have a trim range of 0.9V to
5.0V. The trim resistor equation for the them is :
12.69 −Vout
Rs (kΩ) =
Vout − 0.9
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 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.
Output Voltage
+0.9 V
Rs(Ω)
OPEN
38.3K
18.7K
12.1K
6.34K
3.92K
1.87K
+1.2 V
+1.5 V
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.
+1.8 V
+2.5 V
+3.3 V
+5.0 V
Figure 32: Typical trim resistor values
Please refer to individual datasheet for the maximum allowed
start-up load capacitance for each NC series as it is varied
between series.
+SENSE
Vout
Cout
GROUND
-SENSE
Rs
Rt
TRIM
Vt
Figure 33: Output voltage trim with voltage source
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FEATURES DESCRIPTIONS (CON.)
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.
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.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Thermal Testing Setup
Vt
+SENSE
Rmargin-down
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.
Vout
Cout
GROUND
-SENSE
Rs
TRIM
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.
Rmargin-up
0
Figure 34: Circuit configuration for output voltage margining
Thermal Derating
Reflected Ripple Current and Output Ripple and
Noise Measurement
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 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.
The maximum acceptable temperature measured at
the thermal reference point is 125℃. This is shown in
Figure 36 & 41.
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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THERMAL CURVES (NC12S0A0V30)
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 3.3V(Either Orientation)
Test Section for NC12S0A0V30
Output Current(A)
35
30
25
20
15
10
5
PWB
FACING PWB
MODULE
Natural
Convection
100LFM
200LFM
300LFM
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
AIR FLOW
0
25
35
45
55
65
75
85
Ambient Temperature (℃)
19 (0.75”)
38 (1.5”)
Figure 38: 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)
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 1.5V(Either Orientation)
Output Current(A)
35
30
25
Natural
Convection
20
15
10
5
100LFM
200LFM
300LFM
0
25
35
45
55
65
75
85
Ambient Temperature (℃)
Figure 39: Output current vs. ambient temperature and air
Figure 36: Temperature measurement location
velocity@ Vout=1.5V(Either Orientation)
* The allowed maximum hot spot temperature is defined at 125℃
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 5V(Either Orientation)
@ Vout = 0.9V(Either Orientation)
Output Current(A)
Output Current(A)
35
30
25
35
30
25
20
15
10
5
Natural
Convection
20
15
10
5
Natural
Convection
100LFM
200LFM
300LFM
400LFM
100LFM
200LFM
0
0
25
35
45
55
65
75
85
25
35
45
55
65
75
85
Ambient Temperature (℃)
Ambient Temperature (℃)
Figure 37: Output current vs. ambient temperature and air
Figure 40: Output current vs. ambient temperature and air
velocity@ Vout=5V(Either Orientation)
velocity@ Vout=0.9V(Either Orientation)
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THERMAL CURVES (NC12S0A0H30)
Test Section for NC12S0A0H30
NC12S0A0H30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@ Vout = 3.3V(Either Orientation)
35
30
25
20
15
10
5
PWB
FACING PWB
MODULE
Natural
Convection
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
100LFM
200LFM
300LFM
400LFM
50.8 (2.0”)
AIR FLOW
0
25
35
45
55
65
75
85
9.5 (0.38”)
19 (0.75”)
Ambient Temperature (℃)
Figure 43: Output current vs. ambient temperature and air
Note: Wind Tunnel Test Setup Figure Dimensions are in
millimeters and (Inches)
velocity@ Vout=3.3V(Either Orientation)
NC12S0A0H30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@ Vout =1. 5V(Either Orientation)
35
30
25
20
15
10
5
Natural
Convection
100LFM
200LFM
300LFM
0
25
35
45
55
65
75
85
Ambient Temperature (℃)
Figure 41: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 125℃
Figure 44: Output current vs. ambient temperature and air
velocity@ Vout=1.5V(Either Orientation)
NC12S0A0H30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@ Vout = 5V(Either Orientation)
35
30
25
NC12S0A0H30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@ Vout = 0.9V(Either Orientation)
35
30
25
20
Natural
20
Convection
15
Natural
100LFM
Convection
15
200LFM
100LFM
10
300LFM
200LFM
10
400LFM
300LFM
5
500LFM
5
0
0
25
35
45
55
65
75
85
Ambient Temperature (℃)
25
35
45
55
65
75
85
Ambient Temperature (℃)
Figure 42: Output current vs. ambient temperature and air
Figure 45: Output current vs. ambient temperature and air
velocity@ Vout=5V(Either Orientation)
velocity@ Vout=0.9V(Either Orientation)
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MECHANICAL DRAWING
VERTICAL
HORIZONTAL
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Part Numbering System
NC
12
S
0A0
V
30
P
N
F
A
Product
Series
Input
Voltage
Number of
outputs
Output
Voltage
Output
Current
ON/OFF Pin Length
Logic
Mounting
Option Code
NC-
12-
S- Single
0A0-
H- Horizontal
30- 30A P- Positive
N- Negative
R- 0.118”
N- 0.140”
F- RoHS 6/6 A- Standard
(Lead Free) Functions
Non-isolated 10.2~13.8V output
Converter
programmable V- Vertical
MODEL LIST
Efficiency
12Vin @ 100% load
Model Name
Packaging
Input Voltage
Output Voltage Output Current
NC12S0A0V30PNFA
NC12S0A0H30PNFA
Vertical
10.2 ~ 13.8Vdc
10.2 ~ 13.8Vdc
0.9 V ~ 5.0Vdc
0.9 V ~ 5.0Vdc
30A
30A
94% (5.0V)
Horizontal
94% (5.0V)
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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