DELTA NC12S0A0V50PNFA

FEATURES
High Efficiency:
93% @ 12Vin, 3.3V/50A out
Size: 61.0x31.8x10.2mm
(2.40”×1.25”×0.40”)
Voltage and resistor-based trim
No minimum load required
Output voltage programmable from
0.9Vdc to 3.63Vdc via external resistors
Fixed frequency operation
Single-in line package (SIP)
Input UVLO, output OCP, OTP, SCP
Remote ON/OFF (Positive)
Power good output signal (open collector)
Output voltage sense
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
UL/cUL 60950 (US & Canada), TUV
(EN60950) --pending
Delphi ND Series Non-Isolated Point of Load
DC/DC Power Modules: 12Vin, 0.9V~3.63Vout,
50Aout
OPTION
Negative on/off logic
The Delphi ND Series, 12V input, single output, non-isolated point of
load (POL) DC/DC converters are the latest offering from a world leader
in power systems technology and manufacturing — Delta Electronics,
Inc. The ND/NE product family is the second generation, non-isolated
point-of-load DC/DC power modules for the datacom/networking/IT
applications and it will help to cut the module size by 35% to 50%
compared to the first generation NC series POL modules. The ND/NE
product family provides 6A to 60A of output current in a vertically or
horizontally mounted through-hole package and the output can be
resistor trimmed from 0.9Vdc to 3.63Vdc. It provides a very cost
effective, high efficiency, and high density 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.
PRELIMINARY DATASHEET
DS_ND12S50A_03082007
APPLICATIONS
DataCom
Distributed power architectures
Servers and workstations
LAN/WAN applications
Data processing applications
TECHNICAL SPECIFICATIONS
(Ambient Temperature=25°C, minimum airflow=200LFM, nominal Vin=12Vdc unless otherwise specified.)
PARAMETER
NOTES and CONDITIONS
ND12S0A0V50 (Standard)
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Temperature (Vertical)
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 Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Adjustment Range
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Total output range
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
DYNAMIC CHARACTERISTICS
Output Dynamic Load Response
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time
Turn-On Transient
Start-Up Time, from On/Off Control
Start-Up Time, from input power
Minimum Output Capacitance
Maximum Output Startup Capacive Load
Minimum Input Capacitance
EFFICIENCY
Vo=0.9V
Vo=1.2V
Vo=1.5V
Vo=1.8V
Vo=2.5V
Vo=3.3V
Vo=3.63V
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control
Logic High
Logic Low
GENERAL SPECIFICATIONS
Calculated MTBF
Weight
Over-Temperature Shutdown
DS_ND12S10A_03082007
With appropriate air flow and derating, see Fig. 32
-0.3
0
-40
Non-isolated
Io=Io_min to Io_max
Vin=Vin_min to Vin_max
Over load, line, temperature regulation and set point
5Hz to 20MHz bandwidth
Full Load, 1uF ceramic, 10uF Tan cap and 4*680uF OSCON
Full Load, 1uF ceramic, 10uF Tan cap and 4*680uF OSCON
13.8
124
125
Vdc
°C
°C
V
12.0
13.8
V
8.5
7.1
9.0
7.6
1.4
9.5
8.1
V
V
V
A
mA
mA
mA
dB
15
20
60
24
250
30
0.9
-2
3.63
+2
V
%
-1
-0.2
-3
+1
+0.2
+3
%
%
%
50
15
50
2
100
200
Vo
mV
A
%
mV
%Iomax
25
5
110
12Vin, 1uF ceramic, 10uF Tan cap and 4*680uF OSCON
37.5A to 25A, 10A/uS
25A to 37.5A, 10A/uS
Settling to be within regulation band (to 10% Vo deviation)
From Enable high to 90% of Vo
From Vin=12V to 90% of Vo
Ex: One OSCON 6.3V/680uF (ESR=13mΩ max)
Full Load
Units
10.2
0
Vin=12V, Turn ON
Vin=12V, Turn OFF
Hiccup mode
Max.
NA
100% Load, 10.2Vin, 3.3Vout
Vin=12V, Vout=3.3V
Remote OFF
Refer to Figure 31.
120Hz
With a 1.0% trim resistor
Typ.
75
75
50
mV
mV
µs
10
10
680
3000
0
ms
ms
µF
µF
µF
Vin=12V, Io=50A
Vin=12V, Io=50A
Vin=12V, Io=50A
Vin=12V, Io=50A
Vin=12V, Io=50A
Vin=12V, Io=50A
Vin=12V, Io=50A
82.5
85.5
87.5
89.0
91.5
93.0
93.3
%
%
%
%
%
%
%
Fixed
Positive logic (internally pulled high)
Module On (or leave the pin open)
Module Off
300
KHz
Telcordia SR-332 Issue1 Method1 Case3 at 50°C
2.4
-0.2
Vinmax
0.8
TBD
34.2
134
V
V
Mhours
grams
℃
2
95
95
90
90
EFFICIENCY (%)
EFFICIENCY (%)
ELECTRICAL CHARACTERISTICS CURVES
85
80
75
70
5.01
10.2
10
15
20
25
12.0
30
35
13.8
40
45
85
80
75
70
5.01
50
10.2
10
OUTPUT CURRENT (A)
90
95
EFFICIENCY (%)
EFFICIENCY (%)
100
85
80
70
5.01
10
15
20
25
12.0
30
35
13.8
40
45
75
EFFICIENCY (%)
EFFICIENCY (%)
95
90
85
80
20
25
12.0
30
35
13.8
40
OUTPUT CURRENT (A)
Figure 5: Converter efficiency vs. output current
(2.5V output voltage)
DS_ND12S10A_03082007
50
10.2
15
20
25
12.0
30
35
13.8
40
45
50
Figure 4: Converter efficiency vs. output current
(1.8V output voltage)
95
15
45
OUTPUT CURRENT (A)
100
10
40
80
100
70
5.01
35
85
70
5.01 10
50
Figure 3: Converter efficiency vs. output current
(1.5V output voltage)
10.2
30
90
OUTPUT CURRENT (A)
75
25
Figure 2: Converter efficiency vs. output current
(1.2V output voltage)
95
10.2
20
13.8
OUTPUT CURRENT (A)
Figure 1: Converter efficiency vs. output current
(0.9V output voltage)
75
15
12.0
45
50
90
85
80
75
70
5.01 10
10.2
15
20
25
30
12.0
35
13.8
40
45
50
OUTPUT CURRENT (A)
Figure 6: Converter efficiency vs. output current
(3.3V output voltage)
3
ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 7: Output ripple & noise at 12Vin, 0.9V/50A out
Figure 8: Output ripple & noise at 12Vin, 1.2V/50A out
Figure 9: Output ripple & noise at 12Vin, 1.5V/50A out
Figure 10: Output ripple & noise at 12Vin, 1.8V/50A out
Figure 11: Output ripple & noise at 12Vin, 2.5V/50A out
Figure 12: Output ripple & noise at 12Vin, 3.3V/50A out
DS_ND12S10A_03082007
4
ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 13: Turn on delay time at 12Vin, 0.9V/50A out
Ch1: Vout Ch4: Vin
Figure 14: Turn on delay time Remote On/Off, 0.9V/50A out
Ch1: Vout Ch4: Enable
Figure 15: Turn on delay time at 12Vin, 3.3V/50A out
Ch1: Vout Ch4: Vin
Figure 16: Turn on delay time at Remote On/Off, 3.3V/50A out
Ch1: Vout Ch4: Enable
Figure 17: 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 18: 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
DS_ND12S10A_03082007
5
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, 1.5V
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, 1.8V
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, 3.3V
out
DS_ND12S10A_03082007
6
DESIGN CONSIDERATIONS
FEATURES DESCRIPTIONS
The ND 50A uses two phase and voltage mode controlled
buck topology. The output can be trimmed in the range of
0.9Vdc to 3.63Vdc with 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.
ENABLE (On/Off)
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 the 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.
The converter provides an open collector Power Good
signal. 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.
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 20°C
The ENABLE (on/off) input allows external circuitry to put
the ND converter into a low power dissipation (sleep)
mode. Positive ENABLE is available as standard.
Positive ENABLE units of the ND 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 0.8V.
The ENABLE input can be driven in a variety of ways as
shown in Figures 23 and 24. If the ENABLE signal comes
from the primary side of the circuit, the ENABLE can be
driven through either a bipolar signal transistor (Figure
23). 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 24).
Safety Considerations
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 amperage rating of the fuse.
Figure 23: Enable Input drive circuit for ND series
Figure 24: Enable input drive circuit example with isolation.
DS_ND12S10A_03082007
7
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 7.6V to
9.0V.
Over-Current and Short-Circuit Protection
The ND 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.
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 125°C. 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
Output Voltage Programming
The output voltage of the ND series is trimmable by
connecting an external resistor between the trim pin and
output ground as shown Figure 26 and the typical trim
resistor values are shown in Figure 27.
An over current condition is detected by measuring the
voltage drop across the MOSFETs. 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 detection of the Rds(on) of MOSFETs also acts as
an over temperature protection since high temperature
will cause the Rds(on) of the MOSFETs to increase,
eventually triggering over-current protection.
Remote sense
The ND50 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 0.5V of loss. The remote sense
connects as shown in Figures 25.
Figure 26: Trimming Output Voltage
The ND50 module has a trim range of 0.9V to 3.63V.
The trim resistor equation for the ND50A is:
Vout is the output voltage setpoint
Rs is the resistance between Trim and Ground
Rs values should not be less than 3.32kΩ
Output Voltage
Rs (Ω)
0.9V
+1.2 V
+1.5 V
+1.8V
+2.5 V
open
38.3k
18.7k
12.1k
6.34k
+3.3V
3.92k
+3.63V
3.32k
Figure 27: Typical trim resistor values
Figure 25: circuit configuration for remote sense
DS_ND12S10A_03082007
8
FEATURES DESCRIPTIONS (CON.)
The output can also be set by an external voltage
connected to trim pin as shown in Figure 28
Output Capacitance
There is output capacitor on the ND series modules.
Hence, an external output capacitor is required for stable
operation.
Voltage Margining Adjustment
Figure 28: output voltage trim with voltage source
To use voltage trim, the trim equation for the ND50 is
Output voltage margin adjusting can be implemented in
the ND modules by connecting a resistor, Rmargin-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 29 shows the circuit
configuration for output voltage margining adjustment.
(please refer to Fig.28):
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)
Figure 29: Circuit configuration for output voltage margining
Below is an example about using this voltage trim equation:
Reflected Ripple Current and Output Ripple and
Noise Measurement
Example:
If Vt=1.25V, desired Vout=2.5V and Rs=1kΩ
The measurement set-up outlined in Figure 30 has been
used for both input reflected/ terminal ripple current and
output voltage ripple and noise measurements on ND
series converters.
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 ale 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.
Cs=270µF*1, Ltest=1.4uH, Cin=270µF*2. Cout=680uF*4
Figure 30: Input reflected ripple/ capacitor ripple current and
output voltage ripple and noise measurement setup for ND50
DS_ND12S10A_03082007
9
THERMAL CONSIDERATION
THERMAL CUREVES `
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.
Figure 32: Temperature measurement location* The allowed
maximum hot spot temperature is defined at 124℃
ND12S0A0V50(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=12V Vout=0.9V (Through PCB Orientation)
Output Current (A)
55
50
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’’).
45
Natural
Convection
40
35
100LFM
30
200LFM
25
20
15
Thermal Derating
10
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.
5
0
25
30
PWB
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 33: Output current vs. ambient temperature and air
velocity @Vin=12V, Vout=0.9V(Through PCB Orientation)
ND12S0A0V50(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=12V Vout=2.5V (Through PCB Orientation)
Output Current (A)
55
FACING PWB
35
50
45
MODULE
Natural
Convection
40
35
100LFM
30
200LFM
25
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
300LFM
20
15
50.8 (2.0”)
10
AIR FLOW
5
0
25
11 (0.43”)
22 (0.87”)
Note: Wind tunnel test setup figure dimensions are in
millimeters and (Inches)
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 34: Output current vs. ambient temperature and air
[email protected] Vin=12V, Vout=2.5V(Through PCB Orientation)
Figure 31: Wind tunnel test setup
DS_ND12S10A_03082007
10
THERMAL CUREVES
Output Current (A)
55
ND12S0A0V50(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin=12V Vout=3.3V (Through PCB Orientation)
50
45
Natural
Convection
40
100LFM
35
30
200LFM
25
300LFM
20
15
400LFM
10
5
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
[email protected] Vin=12V, Vout=3.3V(Through PCB Orientation)
MECHANICAL DRAWING
VERTICAL
DS_ND12S10A_03082007
11
PART NUMBERING SYSTEM
ND
Product
Series
ND-
12
S
0A0
Number of
Input Voltage
outputs
12- 10.2~13.8V S- Single
Non-isolated
output
Output
Voltage
0A0 -
V
50
P
N
Mounting
Output
Current
ON/OFF
Logic
Pin
Length
P- Positive
N- 0.140”
V - Vertical
50-50A
programmable
F
A
Option
Code
F- RoHS 6/6 A - standard
(Lead Free)
Series
function
MODEL LIST
Model Name
Packaging
Input Voltage
Output Voltage
Output Current
Efficiency
12Vin @ 100% load
ND12S0A0V50PNFA
Vertical
10.2 ~ 13.8Vdc
0.9 V ~ 3.63Vdc
50A
93%
CONTACT: www.delta.com.tw/dcdc
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
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107 ext. 6220
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.
DS_ND12S10A_03082007
12