FEATURES
High Efficiency: 92.7% @ 28V/16A
Size: 61.0x57.9x12.7mm (2.40”×2.28”×0.50”)
Standard footprint
Industry standard pin out
Fixed frequency operation
Metal baseplate (heatspreader)
Input UVLO, Output OCP, OVP, OTP
Basic insulation
1500V isolation
2:1 Input voltage range
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
UL/cUL 60950-1 (US & Canada), and TUV
(EN60950-1) - pending
APPLICATIONS
Telecom / Datacom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial / Testing Equipment
OPTIONS
Positive on/off logic
Output OVP hiccup option
Delphi Series H48SA, 450W Half Brick Family
DC/DC Power Modules: 48V in, 28V/16A out
The Delphi Series H48SA Half Brick, 48V input, single output,
isolated DC/DC converters are the latest offering from a world leader
in power systems technology and manufacturing -- Delta Electronics,
Inc. The H48SA28016 product provides up to 450 watts of power or
28V/16A in an industry standard footprint. It provides 92.7%
efficiency for 28V at full load. 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. All models
are fully protected from abnormal input/output voltage, current, and
temperature conditions. The Delphi Series converters meet all safety
requirements with basic insulation. A variety of optional heatsinks are
available for extended thermal operation as well as for use in higher
air flow applications: 200 to 400 LFM.
PRELIMINAR DATASHEET
DS_H48SA28016_05202009
H48SA28016_05202009
2
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS H48SA28016 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient 100ms 100 Vdc
Operating Temperature Please refer to Fig. 21 for measuring point -40 98 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 1500 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 48 75 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 33 35 Vdc
Turn-Off Voltage Threshold 31 33 Vdc
Lockout Hysteresis Voltage 2 Vdc
Maximum Input Current 100% Load, 36Vin 16 A
Minimum -Load Input Current 100 mA
Off Converter Input Current Per ETSI EN300 132-2 15 mA
Inrush Current(I2t) 1 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 12 mA
Input Voltage Ripple Rejection 120 Hz 60 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 27.58 28.00 28.42 Vdc
Output Voltage Regulation
Over Load Io=Io,min to Io,max ±28 ±56 mV
Over Line Vin=36V to 75V ±28 ±56 mV
Over Temperature Tc=-40°C to 100°C ±140 ±280 mV
Total Output Voltage Range over sample load, line and temperature 27.16 28.00 28.84 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF Low ESR cap 280 560 mV
RMS Full Load, 1µF ceramic, 10µF Low ESR cap 100 mV
Operating Output Current Range 16 A
Output DC Current-Limit Inception Output Voltage 10% Low 105 120 140 %
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, Tested with 10µF aluminum, Low ESR cap an
d
1
µ
F Ceramic load ca
p
,ΔIo/Δt=1A/10
µ
S
Positive Step Change in Output Current 50% to 75% Io.max 560 mV
Negative Step Change in Output Current 75% to 50% Io.max 560 mV
Settling Time (within 1% Vout nominal) 300 µs
Turn-On Transient
Start-Up Time, From On/Off Control 20 50 ms
Start-Up Time, From Input 20 50 ms
Output Capacitive Load Full load; 5% overshoot of Vout at startup 220 5000 µF
EFFICIENCY
100% Load 92.7 %
80% Load 93 %
ISOLAT ION C HARACTERISTICS
Input to Output 1500 Vdc
Input to Case 1500 Vdc
Output to Case 500 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1900 pF
FEATURE CHARACTERISTICS
Switching Frequency 280 kHz
ON/OFF Control Ne
g
ative Remote On/Off lo
g
ic
Logic Low (Module On) Von/off at Ion/off=1.0mA 0 1.2 V
Logic High (Module Off) Von/off at Ion/off=0.0 µA 2.4 15 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off at Ion/off=1.0mA 0 1.2 V
Logic High (Module On) Von/off at Ion/off=0.0 µA 2.4 15 V
ON/OFF Current Ion/off at Von/off=0.0V 1 mA
Leakage Current Logic High, Von/off=15V 50 uA
Output Voltage Trim Range Across Pins 9 & 5, Vin=48V -50 +18 %
Output Voltage Remote Sense Range Pout ≦ max rated power 0.5 V
Output Over-Voltage Protection 140 %
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C TBD M hours
Weight 97 grams
Over-Temperature Shutdown Please refer to Fig.21 for measuring point 104 °C
H48SA28016_05202009
3
ELECTRICAL CHARACTERISTICS CURVES
89
90
91
92
93
94
2712
output current(A)
Efficiency(%)
36V
48V
75V
0
5
10
15
20
25
30
35
40
45
2712
output current(A)
Power dissipation(W)
36V
48V
75V
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C.
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Io=16A
0
2
4
6
8
10
12
14
16
18
30 40 50 60 70
Input voltage(V)
Input current(A)
Io=16A
Figure 3: Typical input characteristics at room temperature
H48SA28016_05202009
4
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at full load current (resistive load)
(10ms/div). CH3: Vout; 5V/div; CH1: ON/OFF input: 2V/div
Figure 5: Turn-on transient at minimum load current
(10ms/div). CH3: Vout: 5V/div; CH1: ON/OFF input: 2V/div
For Positive Remote On/Off Logic
Figure 6: Turn-on transient at full load current (resistive load)
(10ms/div). CH3 Vout; 5V/div; CH1:Vin: 20V/div
Figure 7: Turn-on transient at zero load current (10ms/div).
CH3 Vout; 5V/div; CH1:Vin: 20V/div
H48SA28016_05202009
5
ELECTRICAL CHARACTERISTICS CURVES
Figure 8: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 1A/10µS
)
. Load cap:
220µF aluminum,10uF Low ESR capacitor and 1µF ceramic
capacitor. Top Trace: Vout (100mV/div), Scope measurement
should be made using a BNC cable (length shorter than 20
inches). Position the load between 51 mm to 76 mm (2 inches
to 3 inches) from the module.
Figure 9: Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 1A/10µS
)
. Load cap:
220µF aluminum,10uF Low ESR capacitor and 1µF ceramic
capacitor. Top Trace: Vout (100mV/div), Scope measurement
should be made using a BNC cable (length shorter than 20
inches). Position the load between 51 mm to 76 mm (2 inches
to 3 inches) from the module.
H48SA28016_05202009
6
ELECTRICAL CHARACTERISTICS CURVES
Figure 10: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 220µF electrolytic capacitor (1A/div).
Figure 11: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load
current (10 mA/div)
Vo(-)
Vo(+)
10u 1u
Copper Strip
SCOPE RESISTIV
E
LOAD
Figure 12: Output voltage noise and ripple measurement test
setup
H48SA28016_05202009
7
ELECTRICAL CHARACTERISTICS CURVES
Figure 13: Test set-up diagram showing measurement points
for Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST
)
of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown above.
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (100mV/div). Load capacitance: 330uF
aluminum, 1μF ceramic capacitor and 10μFlow ESR capacitor.
Bandwidth: 20 MHz. Scope measurement should be made
using a BNC cable (length shorter than 20 inches). Position the
load between 51 mm to 76 mm (2 inches to 3 inches) from the
module.
0
5
10
15
20
25
30
2 7 12 17 22 27
output current(A)
output voltage(V)
32.4
32.5
32.6
32.7
32.8
32.9
33.0
33.1
36 41 46
input voltage
Votrimup
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
Figure 16: maximum trim up output voltage vs input voltage
under full load
H48SA28016_05202009
8
DESIGN CONSIDERATIONS
Input Source Impedance
The impedance of the input source connecting to the
DC/DC power modules will interact with the modules
and affect the stability. A low ac-impedance input source
is recommended. If the source inductance is more than
a few μH, we advise adding a 220 to 470 μF electrolytic
capacitor (ESR < 0.1 Ω at 100 kHz) mounted close to
the input of the module to improve the stability.
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate
in a wide variety of systems and applications. For design
assistance with EMC compliance and related PWB
layout issues, please contact Delta’s technical support
team. An external input filter module is available for
easier EMC compliance design. Application notes to
assist designers in addressing these issues are pending
release.
Safety Considerations
The power module must be installed in compliance with
the spacing and separation requirements of the
end-user’s safety agency standard, i.e., UL60950-1,
CAN/CSA-C22.2, No. 60950-1 and EN60950-1+A11 and
IEC60950-1, if the system in which the power module is
to be used must meet safety agency requirements.
Basic insulation based on 75 Vdc input is provided
between the input and output of the module for the
purpose of applying insulation requirements when the
input to this DC-to-DC converter is identified as TNV-2
or SELV. An additional evaluation is needed if the
source is other than TNV-2 or SELV.
When the input source is SELV, the power module meets
SELV (safety extra-low voltage) requirements. If the
input source is a hazardous voltage which is greater than
60 Vdc and less than or equal to 75 Vdc, for the module’s
output to meet SELV requirements, all of the following
must be met:
The input source must be insulated from the ac
mains by reinforced or double insulation.
The input terminals of the module are not operator
accessible.
If the metal baseplate / heatspreader is grounded
the output must be also grounded.
A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault,
hazardous voltage does not appear at the module’s
output.
When installed into a Class II equipment (without
grounding), spacing consideration should be given to
the end-use installation, as the spacing between the
module and mounting surface have not been evaluated.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
This power module is not internally fused. To achieve
optimum safety and system protection, an input line fuse
is highly recommended. The safety agencies require a
normal-blow fuse with (TBD)A maximum rating to be
installed in the ungrounded lead. A lower rated fuse can
be used based on the maximum inrush transient energy
and maximum input current.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
reliability of a power module and severely affect the
finished circuit board assembly test. Adequate cleaning
and/or drying is especially important for un-encapsulated
and/or open frame type power modules. For assistance
on appropriate soldering and cleaning procedures,
please contact Delta’s technical support team.
H48SA28016_05202009
9
FEATURES DESCRIPTIONS
Over-Current Protection
The module provides two over current protection levels.
When the output current exceeds the low current limit
level, the module will endure current limiting till the
output voltage is lower than 10V. If the output current
exceeds the high current limit level, the module will shut
down immediately.
The modules will try to restart after shutdown (hiccup
mode). If the overload condition still exists, the module
will shut down again. This restart trial will continue until
the overload condition is corrected.
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit, which monitors the voltage on the
output terminals. If this voltage exceeds the over-voltage
set point, the module will shut down and latch off. The
over-voltage latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
Over-Temperature Protection
The over-temperature protection consists of circuitry
that provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold
the module will shut down.
The module will try to restart after shutdown. If the
over-temperature condition still exists during restart, the
module will not start up. This restart trial will continue
until the temperature is within specification.
Remote On/Off
The remote on/off feature on the module can be either
negative or positive logic. Negative logic turns the
module on during logic low and off during logic high.
Positive logic turns the modules on during logic high and
off during logic low.
Remote on/off can be controlled by an external switch
between the on/off terminal and the Vi(-) terminal. The
switch can be an open collector or open drain.
For negative logic if the remote on/off feature is not
used, please short the on/off pin to Vi(-). For positive
logic if the remote on/off feature is not used, please
leave the on/off pin to floating.
Vo(+)Vi(+)
Vo(-)
Sense(-)
Sense(+)
Vi(-)
ON/OFF
Figure 16: Remote on/off implementation
Remote Sense
Remote sense compensates for voltage drops on the
output by sensing the actual output voltage at the point
of load. The voltage between the remote sense pins
and the output terminals must not exceed the output
voltage sense range given here:
[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout
This limit includes any increase in voltage due to
remote sense compensation and output voltage set
point adjustment (trim).
Vi(-)
Vi(+)
Vo(-)
Vo(+)
Sense(+)
Sense(-)
Resistance
Contact Contact and Distributio
n
Losses
Figure 17: Effective circuit configuration for remote sense
operation
If the remote sense feature is not used to regulate the
output at the point of load, please connect SENSE(+) to
Vo(+) and SENSE(–) to Vo(–) at the module.
The output voltage can be increased by both the
remote sense and the trim; however, the maximum
increase is the larger of either the remote sense or the
trim, not the sum of both.
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
Care should be taken to ensure that the maximum
output power does not exceed the maximum rated
power.
H48SA28016_05202009
10
FEATURES DESCRIPTIONS (CON.)
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
the modules may be connected with an external
resistor between the TRIM pin and either the
SENSE(+) or SENSE(-). The TRIM pin should be left
open if this feature is not used.
Figure 18: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases (Fig. 18). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
Rtrim down= 100
Δ2−
⎛
⎜
⎝
⎞
⎟
⎠
ΚΩ
Ex. When Trim-down 40% (28.0V×0.6=16.8V)
Vo 28.0:= VΔ40:=
100
Δ2−0.5=KΩ
Figure 19: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and SENSE (+) the output voltage set point increases
(Fig. 19). The external resistor value required to obtain
a percentage output voltage change △% is defined
as:
Rtrim up= Vo 100 Δ+
(
)
⋅
1.225Δ⋅
100 2Δ+
Δ
−
⎡
⎢
⎣
⎤
⎥
⎦Κ
Ω
Ex. When Trim-up +10%(28.0V×1.1=30.8V)
Vo 28.0:= VΔ10:=
Vo 100 Δ+
()
⋅
1.225 Δ⋅
100 2 Δ⋅+
Δ
−239.429=KΩ
The output voltage can be increased by both the remote
sense and the trim, however the maximum increase is
the larger of either the remote sense or the trim, not the
sum of both.
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
H48SA28016_05202009
11
THERMAL CONSIDERATIONS
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’’).
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
A
IR F LO
W
50.8
(
2.0”
)
FACING PW
B
PWB
AIR VELOCIT
Y
AND AMBIEN
T
TEMPERATUR
E
MEASURED BELO
W
THE MODUL
E
Figure 20: Wind Tunnel Test Setup
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.
THERMAL CURVES
Figure 21: Temperature measurement location viewed from top
side.
The allowed maximum hot spot temperature is defined at 98
℃
H48SA28016(Standard) Output Power vs. Hot Spot Temperature
@Vin = 48V (Either Orientation)
0
50
100
150
200
250
300
350
400
450
500
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Hot Spot Temperature (℃)
Output Power (W)
Figure 22: Output power vs. Hot spot temperature
@Vin=48V (Either Orientation)
H48SA28016_05202009
12
MECHANICAL DRAWING
Pin No. Name Function
1
2
3
4
5
6
7
8
9
+Vin
ON/OFF
CASE
-Vin
-Vout
-SENSE
TRIM
+SENSE
+Vout
Positive input voltage
Remote ON/OFF
Case ground
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive remote sense
Positive output voltage
Pin Specification:
Pins 1-4, 6-8 1.00mm (0.040”) diameter
Pins 5 & 9 2.00mm (0.079”) diameter
All pins are copper with Tin plating.
H48SA28016_05202009
13
PART NUMBERING SYSTEM
H 48 S A 280 16 N Y F H
Form
Factor Input
Voltage Number of
Outputs Product
Series Output
Voltage Output
Current ON/OFF
Logic Pin
Length Option Code
H- Half
Brick
48 -
36~75V
S- Single A- Advanced 280- 28V 16- 16A
N- Negative
P- Positive
Y- 0.200” F- RoHS 6/6
(Lead Free)
space - RoHS
5/6
H- with heatspreader
MODEL LIST
MODEL NAME INPUT OUTPUT EFF @ 100% LOAD
H48SA28016NY H 36V~75V 16A 28V 16A 92.7%
Default remote on/off logic is negative and pin length is 0.170”
For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales
* For modules with through-hole pins and th e optional heatspreader, they are intended for wave soldering assem bly
onto system boards; please do not subject su ch modules through reflow temperature profile.
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: DCDC@delta-es.com
Asia & the rest of world:
Telephone: +886 3 4526107
ext 6220~6224
Fax: +886 3 4513485
Email: DCDC@delta.com.tw
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.
