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
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
Output Voltage Set Point
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 A
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
Start-Up Time, From Input
Minimum Output Startup Capacitive Load
Maximum Output Startup Capacitive Load
Minimum Input Capacitance
Switching Frequency 300 KHz
ON/OFF Control Positive logic (internally pulled high)
Logic High Module On (or leave the pin open) 2.4 Vin,maxV
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
Vin=12V, Io=Io,max, Ta=25℃, 1% trim resistors
Vin=12V, Vo=10% of Vo,set, Ta=25℃
Vo=10% of Vo,set, Ta=25℃
Ex: Two OSCON 6.3V/680µF (ESR 13mΩ max each)
Full load; ESR ≧10mΩ
Ex: OSCON 16V/270µF (ESR 18mΩ max)
Vin=12V, Io=30A 78 %
Auto restart, refer to Fig. 36&41 for the measuring point 130 °C
mA
-3.0 +3.0 %
10
30 ms
1360
5440 µF
270 µF
V
ms
DS_NC12S30A_05222008
2
ELECTRICAL CHARACTERISTICS CURVES
0
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
0 2 4 6 8 1012141618202224262830
10.21213.8
Output Current (A)
Figure 1: Converter efficiency vs. output current
(0.9V output voltage)
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
0 2 4 6 8 1012141618202224262830
10.21213.8
Output Current (A)
Figure 3: Converter efficiency vs. output current
(1.5V output voltage)
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
10.21213.8
Output Current (A)
Figure 2: Converter efficiency vs. output current
(1.2V output voltage)
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
0 2 4 6 8 101214161820222426283
10.21213.8
Output Current (A)
Figure 4: Converter efficiency vs. output current
(1.8V output voltage)
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
10.21213.8
Output Current (A)
Figure 5: Converter efficiency vs. output current
(2.5V output voltage)
DS_NC12S30A_05222008
100
90
80
70
60
50
40
Efficiency (%)
30
20
10
0
0 2 4 6 8 1012141618202224262830
10.21213.8
Output Current (A)
Figure 6: Converter efficiency vs. output current
(3.3V output voltage)
3
ELECTRICAL CHARACTERISTICS CURVES (CON.)
120
100
80
60
40
Efficiency (%)
20
0
0 2 4 6 8 1012141618202224262830
Figure 7: Converter efficiency vs. output current
(5.0V output voltage)
10.21213.8
Output Current (A)
Figure 8: Output ripple & noise at 12Vin, 0.9V/30A out
Figure 9: Output ripple & noise at 12Vin, 1.2V/30A out
Figure 11: Output ripple & noise at 12Vin, 1.8V/30A out
DS_NC12S30A_05222008
Figure 10: Output ripple & noise at 12Vin, 1.5V/30A out
Figure 12: Output ripple & noise at 12Vin, 2.5V/30A out
4
ELECTRICAL CHARACTERISTICS CURVES (CON.)
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
Ch2:Vin Ch3:Vout Ch4:PWRGD
Figure 14: Output ripple & noise at 12Vin, 5.0V/30A out
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
DS_NC12S30A_05222008
Figure 18: Turn on delay time at Remote On/Off, 5.0V/30A out
Ch2: ENABLE Ch3:Vout Ch4:PWRGD
5
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 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 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 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)
DS_NC12S30A_05222008
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)
6
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
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℃
disabled whenthe
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
Vin
Ground
Ground
Vout
TrimEnable
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
Figure 26: Enable Input drive circuit for NC series
5V
Figure 27: Enable input drive circuit using logic gate.
Figure 28: Enable input drive circuit example with isolation.
NC30/NC40
Vin
Ground
NC30/NC40
Vin
Enable
Ground
Ground
Ground
Vout
TrimEnable
Vout
Trim
7
N
I-S
I-S
V
+
G
G
T
N
T
+
L
-
S
-
S
V
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.
o
o
Figure 29: Circuit configuration for remote sense
VIN
GROUND
Vo
+SENSE
-SENSE
GROUND
R
load
Contact and Distribution
Losses
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 ofmonitored 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.
0
0
Figure 30: NC30/NC40 Current Sharing Diagram
C30A/40A
RIM
C30A/40A
RIM
out
SENSE
ENSE
ROUND
HARE
out
SENSE
ENSE
ROUND
HARE
Cout
OAD
Cout
DS_NC12S30A_05222008
8
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
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 (k
Ω) =
Vout is the desired voltage setpoint,
Rs is the trim resistance between TRIM and Ground,
Rs values should not be less than 1.8 k
Output Voltage Rs(Ω)
Figure 32: Typical trim resistor values
+SENSE
Vout
GROUND
-SENSE
69.12
−
−
Vout
+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
+SENSE
GROUND
-SENSE
TRIM
Vout
9.0
Vout
TRIM
Cout
Rs
Ω
Cout
Rs
Rt
Vt
To use voltage trim, the trim equation for the NC30 is (please
refer to Fig. 33) :
−
=Ω
kRt
)(
VoutVtRs
RsVoutRs
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 k
−
)(
kRt72.0
=Ωk
VoutVtRs
RsVoutRs
)69.121.13(
69.12)1(9.0
++−
Ω
)69.121.13(
69.12)1(9.0
++−
Ω=
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.
Figure 33: Output voltage trim with voltage source
DS_NC12S30A_05222008
9
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, R
pin to the output pin. Figure 34 shows the circuit
configuration for output voltage margining adjustment.
+SENSE
Vout
GROUND
-SENSE
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.
margin-down, from the Trim
Vt
Rmargin-down
Cout
Rs
Rmargin-up
0
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.
Cs=270uF*1 Ltest=1.4uH Cin=270uF*1 Cout=680uF*2
Figure 35
output voltage ripple and noise measurement setup for NC30
: Input reflected ripple/ capacitor ripple current and
DS_NC12S30A_05222008
10
A
Y
THERMAL CURVES (NC12S0A0V30)
Test Section for NC12S0A0V30
FACING PWB
PWB
Output Current(A)
35
30
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vout = 3.3V(Either Orientation)
MODULE
AIR VELOCIT
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
IR FLOW
50.8 (2.0”)
19 (0.75”)
38 (1.5”)
Note: Wind Tunnel Test Setup Figure Dimensions are in
millimeters and (Inches)
25
20
Natural
Convection
100LFM
15
200LFM
300LFM
10
5
0
25354555657585
Ambient Temperature (℃)
Figure 38: Output current vs. ambient temperature and air
velocity@ Vout=3.3V(Either Orientation)
Output Current(A)
35
30
25
20
15
10
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Natural
Convection
100LFM
200LFM
300LFM
@ Vout = 1.5V(Either Orientation)
Figure 36: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 125
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
35
30
25
20
Natural
Convection
100LFM
15
200LFM
300LFM
10
400LFM
5
0
25354555657585
Figure 37: Output current vs. ambient temperature and air
velocity@ Vout=5V(Either Orientation)
DS_NC12S30A_05222008
@ Vout = 5V(Either Orientation)
Ambient Temperature (℃)
℃
5
0
25354555657585
Ambient Temperature (℃)
Figure 39: Output current vs. ambient temperature and air
velocity@ Vout=1.5V(Either Orientation)
NC12S0A0V30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
35
30
25
20
Natural
Convection
100LFM
15
200LFM
10
5
0
25354555657585
Figure 40: Output current vs. ambient temperature and air
velocity@ Vout=0.9V(Either Orientation)
@ Vout = 0.9V(Either Orientation)
Ambient Temperature (℃)
11
A
Y
THERMAL CURVES (NC12S0A0H30)
Test Section for NC12S0A0H30
IR FLOW
PWB
MODULE
50.8 (2.0”)
9.5 (0.38”)
19 (0.75”)
FACI NG PWB
AIR VELOCIT
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Note: Wind Tunnel Test Setup Figure Dimensions are in
millimeters and (Inches)
NC12S0A0H30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
35
30
25
20
Natural
Convection
15
100LFM
200LFM
10
300LFM
400LFM
5
0
25354555657585
Figure 43: Output current vs. ambient temperature and air
velocity@ Vout=3.3V(Either Orientation)
NC12S0A0H30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
35
30
@ Vout = 3.3V(Either Orientation)
Ambient Temperature (℃)
@ Vout =1. 5V(Either Orientation)
Figure 41: Temperature measurement location
* The allowed maximum hot spot temperature is defined at 125
NC12S0A0H30(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
35
30
25
20
Natural
Convection
15
100LFM
200LFM
10
300LFM
400LFM
5
500LFM
0
25354555657585
@ Vout = 5V(Either Orientation)
Ambient Temperature (℃)
Figure 42: Output current vs. ambient temperature and air
velocity@ Vout=5V(Either Orientation)
DS_NC12S30A_05222008
℃
25
20
Natural
Convection
15
100LFM
200LFM
10
300LFM
5
0
25354555657585
Ambient Temperature (℃)
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)
35
30
25
20
Natural
Convection
15
100LFM
200LFM
10
300LFM
5
0
25354555657585
Figure 45: Output current vs. ambient temperature and air
velocity@ Vout=0.9V(Either Orientation)
@ Vout = 0.9V(Either Orientation)
Ambient Temperature (℃)
12
MECHANICAL DRAWING
VERTICAL HORIZONTAL
DS_NC12S30A_05222008
13
Part Numbering System
NC 12 S 0A0 V 30 P N F A
Product
Series
NC-
Non-isolated
Converter
Input
Voltage
12-
10.2~13.8V
Number of
outputs
S- Single
output
Output
Voltage
0A0-
programmable
Mounting
H- Horizontal
V- Vertical
Output
Current
30- 30A P- Positive
ON/OFF
Logic
N- Negative
Pin Length
R- 0.118”
N- 0.140”
F- RoHS 6/6
(Lead Free)
Option Code
A- Standard
Functions
MODEL LIST
Model Name Packaging Input Voltage Output Voltage Output Current
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
.
DS_NC12S30A_05222008
14
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