NC12S0A0H20

FEATURES

High Efficiency:
91% @ 12Vin, 5V/20A 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 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing
facility

UL/cUL 60950-1 (US & Canada)
Recognized
Delphi NC20 Series Non-Isolated Point of Load
DC/DC Power Modules: 12Vin, 0.9V-5.0Vout, 20A
OPTIONS
The Delphi NC20 Series, 12V input, single output, non-isolated point of
load DC/DC converters are the latest offering from a world leader in

Vertical or horizontal mounted

Negative On/Off logic
power systems technology and manufacturing ― Delta Electronics, Inc.
The NC20 series operates from a 12V nominal input, provides up to
20A 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_NC12S20A_12092011
APPLICATIONS

DataCom

Distributed power architectures

Servers and workstations

LAN / WAN applications

Data processing applications
TECHNICAL SPECIFICATIONS
(Ambient Temperature=25°C, minimum airflow=200LFM, Vin=12Vdc, nominal Vout unless otherwise specified.)
PARAMETER
NOTES and CONDITIONS
NC12S0A0V/H20
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Temperature (Vertical)
Operating Temperature (Horizontal)
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
Off Converter Input Current
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Adjustment Range
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Output Current Range
Output Voltage Over-shoot at Start-up
Output Voltage Under-shoot at Power-Off
Output DC Current-Limit Inception
Output Short-Circuit Current
DYNAMIC CHARACTERISTICS
Out Dynamic Load Response
Positive Step Change in Output Current
Negative Step Change in Output Current
Setting Time to 10% of Peak Devitation
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, by input power
Minimum Output Capacitance
Maximum Output Startup Capacitive Load
Minimum Input Capacitance
EFFICIENCY
Vo=0.9V
Vo=1.2V
Vo=1.8V
Vo=2.5V
Vo=3.3V
Vo=5.0V
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control
Logic High
Logic Low
GENERAL SPECIFICATIONS
MTBF
Weight
DS_NC12S20A_12092011
With appropriate air flow and derating, see Fig. 33
With appropriate air flow and derating, see Fig. 39
Typ.
0
-40
-40
Non-isolated
Max.
Units
14
130
125
125
Vdc
°C
°C
°C
V
13.8
V
NA
10.2
12
9.0
7.5
1.5
100% Load, 10.2Vin, 5Vout
Vin=12V, Vout=0.9V
Remote OFF
Refer to Figure 31.
120 Hz
With a 1.0% trim resistors
Io=Io,min to Io,max (excluding soldered pins)
Vin=Vin,min to Vin,max
5Hz to 20MHz bandwidth
Full Load, 100nF ceramic, 10µF tantalum
Full Load, 100nF ceramic, 10µF tantalum
Vin=12V, Turn ON
Vin=12V, Turn OFF
Hiccup mode
Hiccup mode
10.65
68
8
180
45
0.9
-3.0
5.0
+3.0
V
%
-1.3
-0.2
+1.3
+0.2
%
%
0
50
20
20
1
100
mV
mV
A
%
mV
A
21
12Vin, 10µF Tan & 1µF Ceramic load cap, 10A/µs
50% Io,max to 75% Io,max
75% Io,max to 50% Io,max
Settling to be within regulation band (Vo +/- 3%)
From Enable high to 10% of Vo
From Vin=12V to 10% of Vo
EX: Al-Polymer PSA series (6.3V/680µF, ESR 7 mΩ max)
max.)
Full load
Ex: OSCON (16V/270µF, ESR 18 mΩ max.)
V
V
V
A
mA
mA
mA
dB
100
100
200
mV
mV
µs
10
10
ms
ms
11560
µF
µF
680
270
Vin=12V, Io=20A
Vin=12V, Io=20A
Vin=12V, Io=20A
Vin=12V, Io=20A
Vin=12V, Io=20A
Vin=12V, Io=20A
75
78
84
86
88
91
%
%
%
%
%
%
Fixed
Positive logic (internally pulled high)
Module On (or leave the pin open)
Module Off
200
KHz
Telcordia SR-332 Issue1 Method1 Case3 at 50°C
2.4
0
5.5
0.8
1.28
16.5
V
V
M hours
grams
2
90
100
80
90
70
80
Efficiency (%)
Efficiency (%)
ELECTRICAL CHARACTERISTICS CURVES
60
50
40
30
20
10.2
10
12
70
60
50
40
30
20
13.8
10.2
0
1
3
4
5
7
8
9
11 12 13 15 16 17 19 20
0
1
3
4
5
Output Current (A)
90
80
80
70
70
Efficiency (%)
100
90
60
50
40
30
10.2
12
8
9 11 12 13 15 16 17 19 20
Figure 2: Converter efficiency vs. output current
(1.2V output voltage)
100
20
7
Output Current (A)
Figure 1: Converter efficiency vs. output current
(0.9V output voltage)
Efficiency (%)
13.8
0
0
60
50
40
30
20
13.8
10
10.2
12
13.8
10
0
0
0
1
3
4
5
7
8
9 11 12 13 15 16 17 19 20
0
1
3
4
5
Output Current (A)
90
80
80
70
70
Efficiency (%)
100
90
60
50
40
30
10.2
12
8
9 11 12 13 15 16 17 19 20
Figure 4: Converter efficiency vs. output current
(2.5V output voltage)
100
20
7
Output Current (A)
Figure 3: Converter efficiency vs. output current
(1.8V output voltage)
Efficiency (%)
12
10
13.8
10
60
50
40
30
20
10.2
12
13.8
10
0
0
0
1
3
4
5
7
8
9 11 12 13 15 16 17 19 20
Output Current (A)
Figure 5: Converter efficiency vs. output current
(3.3V output voltage)
DS_NC12S20A_12092011
0
1
3
4
5
7
8
9 11 12 13 15 16 17 19 20
Output Current (A)
Figure 6: Converter efficiency vs. output current
(5.0V output voltage)
3
ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 7: Output ripple & noise at 12Vin, 0.9V/20A out
Figure 8: Output ripple & noise at 12Vin, 1.2V/20A out
Figure 9: Output ripple & noise at 12Vin, 1.8V/20A out
Figure 10: Output ripple & noise at 12Vin, 2.5V/20A out
Figure 11: Output ripple & noise at 12Vin, 3.3V/20A out
Figure 12: Output ripple & noise at 12Vin, 5.0V/20A out
DS_NC12S20A_12092011
4
ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 13: Turn on delay time at 12Vin, 0.9V/20A out
Ch2:Vin Ch3:Vout Ch4:PWRGD
Figure 14: Turn on delay time Remote On/Off, 0.9V/20A out
Ch2:ENABLE Ch3:Vout Ch4:PWRGD
Figure 15: Turn on delay time at 12Vin, 2.5V/20A out
Ch2:Vin Ch3:Vout Ch4:PWRGD
Figure 16: Turn on delay time at Remote On/Off, 2.5V/20A out
Ch2: ENABLE Ch3:Vout Ch4:PWRGD
Figure 17: Turn on delay time at 12Vin, 5.0V/20A out
Ch2:Vin Ch3:Vout Ch4:PWRGD
Figure 18: Turn on delay time at Remote On/Off, 5.0V/20A out
Ch2: ENABLE Ch3:Vout Ch4:PWRGD
DS_NC12S20A_12092011
5
ELECTRICAL CHARACTERISTICS CURVES (CON.)
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
DS_NC12S20A_12092011
6
DESIGN CONSIDERATIONS
The NC20A 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 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.
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 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
(Fig. 24) or a logic gate (Fig. 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).
NC6A/15A/20A
Vin
Figure 23: Block Diagram
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.
Enable
Trim
Ground
Ground
Figure 24: Enable Input drive circuit for NC series
5V
Safety Considerations
Vout
NC6A/15A/20A
Vin
Vout
Enable
Trim
Ground
Ground
Figure 25: Enable input drive circuit using logic gate.
NC6A/15A/20A
Vin
Enable
Ground
Vout
Trim
Ground
Figure 26: Enable input drive circuit example with isolation.
DS_NC12S20A_12092011
7
The NC15A/20A module has a trim range of 0.9V to
5.0V. The trim resistor equation for the NC6A/NC15A/
NC20A is :
FEATURES DESCRIPTIONS
Input Under-Voltage Lockout
Rs () 
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.
1170
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
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. Please see the electrical characteristics
for details of the OCP function.
Output Voltage
Rs (Ω)
+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
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
Enable
Trim
Rt
Vt
Rs
Ground
Output Voltage Programming
Ground
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) :
Rt (k) 
Rs (1.3Vt  1.17)
1.17  Rs (Vout  0.9)
NC6A/15A/20A
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)
Vout
Vin
Trim
Enable
Rs
Ground
Ground
Figure 27: Trimming Output Voltage
Below is an example about using this voltage trim
equation :
Example：
If Vt = 1.25V, desired Vout = 2.5V and Rs = 0.715KΩ
Rt ( K) 
DS_NC12S20A_12092011
Rs (1.3Vt  1.17)
 12.51K
1.17  Rs (Vout  0.9)
8
FEATURES DESCRIPTIONS
Output Capacitance
Power Good
There is no output capacitor on the NC series modules.
Hence, an external output capacitor is required for stable
operation. For NC20 modules, an external 6.3V/680μF
low ESR capacitor (for example, OSCON Al-Polymer PSA
series) is required for stable operation.
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.
Current Sink Capability
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.
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.
Reflected Ripple Current and Output Ripple and
Noise Measurement
Voltage Margining Adjustment
Output voltage margin adjusting can be implemented in
the NC modules by connecting a resistor, R margin-up, from
the Trim pin to the Ground 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.
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.
Vt
NC6A/15A/20A
Vin
Enable
Vout
Rmargin-down
Trim
Rmargin-up
Rs
Ground
Ground
Figure 30: Circuit configuration for output voltage margining
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 NC20
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.
DS_NC12S20A_12092011
9
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 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.
DS_NC12S20A_12092011
10
THERMAL CURVES (NC12S0A0V20)
NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =3.3V (Either Orientation)
PWB
FACING PWB
Output Current (A)
20
MODULE
16
Natural
Convection
12
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
100LFM
200LFM
8
300LFM
50.8 (2.0”)
400LFM
AIR FLOW
500LFM
4
600LFM
17.5 (0.69”)
35 (1.38”)
Note: Wind Tunnel Test Setup Figure Dimensions are in
millimeters and (Inches)
Figure 32: Wind tunnel test setup
0
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)
NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =1.8V (Either Orientation)
Output Current (A)
20
16
Natural
Convection
12
100LFM
200LFM
8
300LFM
400LFM
500LFM
4
600LFM
0
25
Figure 33: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 130 ℃
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =0.9V (Either Orientation)
NC12S0A0V20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =5V (Either Orientation)
Output Current (A)
20
20
16
16
Natural
Convection
35
Figure 36: Output current vs. ambient temperature and air
velocity@ Vout=1.8V(Either Orientation)
Output Current (A)
12
30
Natural
Convection
12
100LFM
100LFM
200LFM
200LFM
8
8
300LFM
300LFM
400LFM
400LFM
500LFM
500LFM
4
4
600LFM
0
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 34: Output current vs. ambient temperature and air
velocity@Vout=5V(Either Orientation)
DS_NC12S20A_12092011
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 37: Output current vs. ambient temperature and air
velocity@ Vout=0.9V(Either Orientation)
11
THERMAL CURVES (NC12S0A0H20)
NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =3.3V (Either Orientation)
Output Current (A)
PWB
FACING PWB
20
MODULE
16
Natural
Convection
12
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
100LFM
200LFM
8
300LFM
50.8 (2.0”)
400LFM
500LFM
AIR FLOW
4
600LFM
0
9.5 (0.37”)
19 (0.75”)
25
Note: Wind Tunnel Test Setup Figure Dimensions are in
millimeters and (Inches)
Figure 38: Wind tunnel test setup
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 41: Output current vs. ambient temperature and air
velocity@ Vout=3.3V(Either Orientation)
NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =1.8V (Either Orientation)
Output Current (A)
20
16
Natural
Convection
12
100LFM
200LFM
8
300LFM
400LFM
500LFM
4
0
25
Figure 39: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 125 ℃
NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =5V (Either Orientation)
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
NC12S0A0H20 (Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout =0.9V (Either Orientation)
Output Current (A)
20
20
16
16
Natural
Convection
35
Figure 42: Output current vs. ambient temperature and air
velocity@ Vout=1.8V(Either Orientation)
Output Current (A)
12
30
Natural
Convection
12
100LFM
100LFM
200LFM
200LFM
8
8
300LFM
300LFM
400LFM
400LFM
500LFM
4
4
600LFM
0
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 40: Output current vs. ambient temperature and air
velocity @Vout=5V(Either Orientation)
DS_NC12S20A_12092011
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 43: Output current vs. ambient temperature and air
velocity@ Vout=0.9V(Either Orientation)
12
MECHANICAL DRAWING
DS_NC12S20A_12092011
13
PART NUMBERING SYSTEM
NC
Product
Series
12
S
Input Number of
Voltage
outputs
NC12S- Single
Non-isolated 10.2~13.8V output
Converter
V
0A0
Output
Voltage
P
N
ON/OFF
Logic
Pin
Length
20
Output
Mounting
Current
0A0H- Horizontal 20- 20A
programmable V- Vertical
P- Positive N- 0.150”
N- Negative
F
A
Option Code
F- RoHS 6/6
(Lead Free)
A- Standard
Function
MODEL LIST
Packaging
Input Voltage
Output Voltage
Output Current
Efficiency
12Vin @ 100% load
NC12S0A0V20PNFA
Vertical
10.2 ~ 13.8Vdc
0.9 V ~ 5.0Vdc
20A
91% (5.0V)
NC12S0A0H20PNFA
Horizontal
10.2 ~ 13.8Vdc
0.9 V ~ 5.0Vdc
20A
91% (5.0V)
Model Name
CONTACT:
www.deltaww.com/dcdc
USA:
Telephone:
East Coast: 978-656-3993
West Coast: 510-668-5100
Fax: (978) 656 3964
Email: [email protected]
Europe:
Telephone: +31-20-655-0967
Fax: +31-20-655-0999
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107 x6220~6224
Fax: +886 3 4513485
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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