DELTA S24SA12006PRFA

FEATURES
High efficiency: 85.5% @ 1.2V/ 12A
Size: 47.2mm x 29.5mm x 8.5mm
(1.86" x 1.16" x 0.33")
Low profile: 0.33"
Industry standard footprint and pin out
Surface mountable
Fixed frequency operation
Input UVLO, Output OCP, OVP, OTP
No minimum load required
2:1 input voltage range
Basic insulation
2250 isolation
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing
facility
UL/cUL 60950 (US & Canada) recognized,
and TUV (EN60950) certified
Delphi Series S24SA, 2”x1” Family
DC/DC Power Modules: 18~36Vin, 1.2V, 12A out
The Delphi Series S24SA, surface mountable, 24V input, single output,
isolated DC/DC converter is the latest offering from a world leader in
power system and technology and manufacturing -- Delta Electronics, Inc.
This product family provides up to 36 watts of power or up to 12A of
output current (for output voltage 1.8V or below) in a low profile 2”x1”
industry standard form factor and pinout. The S24SA operates from a
wide input range of 18V to 36V, output ranges from 1.2V to 12V. For 1.2V
at 12A full load, the efficiency is up to 85.5%. 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 protected from abnormal input/output voltage and current
conditions, and feature 2250V input/output isolation and basic insulation.
OPTIONS
Positive on/off logic
SMD or Through hole mounting
APPLICATIONS
Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S24SA1R212_05102006
Delta Electronics, Inc.
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=200 LFM, Vin=24Vdc, nominal Vout unless otherwise noted.)
PARAMETER
NOTES and CONDITIONS
S24SA1R212NRFA
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Operating Temperature
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
Inrush Current(I2t)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time to 1% of Final value
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
ISOLATION CHARACTERISTICS
Isolation Voltage
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, (Logic Low-Module ON)
Logic Low
Logic High
ON/OFF Current
Leakage Current
Output Voltage Trim Range
Output Over-Voltage Protection(Hiccup)
GENERAL SPECIFICATIONS
Calculated MTBF
Weight
Over-Temperature Shutdown
Please refer to Fig. 18 For measuring point
Typ.
-0.3
-40
-55
Output Voltage 10% Low
50
110
125
2250
Vdc
°C
°C
Vdc
24
36
V
17
15
2
18
13
1
V
V
V
A
mA
mA
A2s
mA
dB
3
2.2
40
7
0.01
5
50
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Io=Io,min to Io,max
Vin=18V to36V
Ta=-40℃ to 85℃
Over sample load, line and temperature
5Hz to 20MHz bandwidth
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
Units
18
100% Load, 18Vin
Vin=24V, Io=50%Io.max, Ta=25℃
Max.
1.17
1.20
1.23
V
±2
±2
100
±10
±5
300
1.25
mV
mV
ppm/℃
V
20
5
50
15
12
18
mV
mV
A
A
30
30
200
75
75
mV
mV
µs
12
12
2200
ms
ms
µF
1.15
0
13.2
24V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
50% Io,max to 75% Io,max
75% Io,max to 50% Io.max
Full load; 5% overshoot of Vout at startup
85.5
%
2250
1500
V
MΩ
pF
330
kHz
10
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Ion/off at Von/off=0.0V
Logic High, Von/off=15V
Across Trim Pin & +Vo or –Vo, Pout≦max rated
Over full temp range; % of nominal Vout
Io=80% of Io, max; Ta=25°C, Airflow=200LFM
Please refer to Fig.18 For measuring point
0
0.8
15
1
50
+10
160
-10
115
6.2
18
115
V
V
mA
uA
%
%
Mhours
grams
°C
2
DS_S24SA1R212_05102006
POWER DISSIPATION (W)
EFFICIENCY (%)
ELECTRICAL CHARACTERISTICS CURVES
95
90
85
80
75
70
4.0
3.5
3.0
2.5
2.0
65
1.5
60
55
1.0
50
18Vin
18Vin
0.5
24Vin
45
24Vin
36Vin
36Vin
0.0
40
1
2
3
4
5
6
7
8
9
10 11 12
1
2
3
4
5
6
7
8
9
10 11 12
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
INPUT CURRENT (A)
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.
1.2
Io=12A
Io=7.2A
1.0
Io=1.2A
0.8
0.6
0.4
0.2
0.0
15
20
25
30
35
INPUT VOLT AGE (V)
Figure 3: Typical input characteristics at room temperature.
Figure 4: Turn-on transient at full rated load current (1 ms/div).
Top Trace: Vout (500mV/div); Bottom Trace: ON/OFF Control
(5V/div).
3
DS_S24SA1R212_05102006
ELECTRICAL CHARACTERISTICS CURVES
Figure5: Turn-on transient at zero load current (1 ms/div). Top
Trace: Vout (500mV/div); Bottom Trace: ON/OFF Control
(5V/div).
Figure 6: Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF,
100 mΩESR tantalum capacitor and 1µF ceramic capacitor.
Top Trace: Vout (50mV/div), Bottom Trace: Iout (5A/div).
is
Vi (+)
Cs : 220uF
ESR < 0.1 Ω
@20℃ 100KHZ
Cs :100uF
ESR < 0.5 Ω
@20℃ 100KHZ
Vi (-)
Figure 7: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, 100 mΩESR tantalum capacitor and 1µF ceramic
capacitor.
Top Trace: Vout (50mV/div), Bottom Trace: Iout
5A/div).
Figure 8: Test set-up diagram showing measurement points
for Input Reflected Ripple Current (Figure 9).
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 µH. Capacitor Cs offset
possible battery impedance.
4
DS_S24SA1R212_05102006
ELECTRICAL CHARACTERISTICS CURVES
Copper Strip
Vo(+)
10u
1u
SCOPE
RESISTIVE
LOAD
Vo(-)
Figure 10: Output voltage noise and ripple measurement test
setup. 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.
OUTPUT VOLTAGE (V)
Figure 9: Input Reflected Ripple Current, is, at full rated output
current and nominal input voltage with 12µH source impedance
and 100µF electrolytic capacitor (2 mA/div).
1.4
1.2
1.0
0.8
0.6
0.4
Vin=24V
0.2
0.0
0.0
2.0
4.0
6.0
8.0
10.0 12.0
14.0 16.0
LOAD CURRENT (A)
Figure 11: Output voltage ripple at nominal input voltage and
rated load current (10 mV/div). Load capacitance: 1µF ceramic
capacitor and 10µF tantalum capacitor. Bandwidth: 20 MHz.
Figure 12: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
5
DS_S24SA1R212_05102006
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 10 to 100 µF
electrolytic capacitor (ESR < 0.7 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.
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 5A 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.
Safety Considerations
The power module must be installed in compliance with
the spacing and separation requirements of the enduser’s safety agency standard if the system in which the
power module is to be used must meet safety agency
requirements.
When the input source is 60Vdc or below, 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 any
hazardous voltages, including the ac mains, with
reinforced insulation.
One Vi pin and one Vo pin are grounded, or all the
input and output pins are kept floating.
The input terminals of the module are not operator
accessible.
A SELV reliability test is conducted on the system
where the module is used to ensure that under a
single fault, hazardous voltage does not appear at
the module’s output.
Do not ground one of the input pins without grounding
one of the output pins. This connection may allow a nonSELV voltage to appear between the output pin and
ground.
6
DS_S24SA1R212_05102006
FEATURES DESCRIPTIONS
Vi(+)
Over-Current Protection
Sense(+)
ON/OFF
The modules include an internal output over-current
protection circuit, which will endure current limiting for
an unlimited duration during output overload. If the
output current exceeds the OCP set point, the modules
will automatically shut down (hiccup mode).
The modules will try to restart after shutdown. 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 overvoltage set point, the module will shut down (Hiccup
mode). The modules will try to restart after shutdown. If
the fault condition still exists, the module will shut down
again. This restart trial will continue until the fault
condition is corrected.
Vo(+)
Sense(-)
Vi(-)
Vo(-)
Figure 13: Remote on/off implementation
Remote Sense (Optional)
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).
Over-Temperature Protection
Vi(+) Vo(+)
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 overtemperature condition still exists during restart, the
module will shut down again. 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 a logic low and off during a logic high.
Positive logic turns the modules on during a logic high
and off during a 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 floating.
Sense(+)
Sense(-)
Contact
Resistance
Vi(-)
Vo(-)
Contact and Distribution
Losses
Figure 14: 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.
7
DS_S24SA1R212_05102006
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 Vo+ or Vo -. The
TRIM pin should be left open if this feature is not used.
Rtrim − up =
15.9(100 + ∆Vo%) − 1089
− 62[ΚΩ]
∆Vo%
Ex. When trim-up +10% (1.2V X 1.1 = 1.32V)
15.9(100 + 10) − 1089
− 62 = 4[ΚΩ ]
10
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
Rtrim − up =
Figure 15: Circuit configuration for trim-down (decrease output
voltage)
If the external
and Vo- pins,
The external
percentage of
as:
resistor is connected between the TRIM
the output voltage set point decreases.
resistor value required to obtain a
output voltage change △Vo% is defined
1089
− 62[ΚΩ ]
∆Vo%
Ex. When trim-down –10% (1.2V X 0.9 = 1.08V)
1089
Rtrim − down =
− 62 = 46.9[ΚΩ]
10
Rtrim − down =
Figure 16: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and Vo+ pins, the output voltage set point increases.
The external resistor value required to obtain a
percentage output voltage change △Vo% is defined as:
8
DS_S24SA1R212_05102006
THERMAL CONSIDERATIONS
THERMAL CURVES
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 18: Hot spot temperature measured point
*The allowed maximum hot spot temperature is defined at 110℃
S24SA1R212NR (Standard) Output Current vs. Ambient Temperature and Air Velocity
(Either Orientation)
Output Current(A)
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 or a heat sink is
6.35mm (0.25”).
12
10
Natural
Convection
7
100LFM
200LFM
Thermal Derating
5
300LFM
Heat can be removed by increasing airflow over the
module. The module’s maximum hot spot temperature is
To. 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.
2
0
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 19: Output current vs. ambient temperature and air velocity
(Either Orientation)
PWB
FACING PWB
MODULE
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
AIR FLOW
10 (0.4”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 17: Wind tunnel test setup
9
DS_S24SA1R212_05102006
PICK AND PLACE LOCATION
SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
10
DS_S24SA1R212_05102006
LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Temperature (°C )
250
200
150
Ramp-up temp.
0.5~3.0°C /sec.
2nd Ramp-up temp. Peak temp.
1.0~3.0°C /sec. 210~230°C 5sec.
Pre-heat temp.
140~180°C 60~120 sec.
Cooling down rate <3°C /sec.
100
Over 200°C
40~50sec.
50
0
60
120
Time ( sec. )
180
240
300
Note: The temperature refers to the pin of S24SA, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
Temp.
Peak Temp. 240 ~ 245 ℃
217℃
Ramp down
max. 4℃/sec.
200℃
Preheat time
100~140 sec.
150℃
Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
25℃
Time
Note: The temperature refers to the pin of S24SA, measured on the pin +Vout joint.
11
DS_S24SA1R212_05102006
MECHANICAL DRAWING
Surface-Mount Module
Pin No.
1
2
6
8
11
12
Optional Pin
4
5
Name
+Vout
-Vout
Trim
ON/OFF
-Vin
+Vin
Name
+Sense (Option)
-Sense (Option)
Through-Hole Module
Function
Positive output voltage
Negative output voltage
Output voltage trim
ON/OFF logic
Negative input voltage
Positive input voltage
Function
Positive sense pin
Negative sense pin
12
DS_S24SA1R212_05102006
PART NUMBERING SYSTEM
S
Form
Factor
24
Input
Voltage
S
Number of
Outputs
S- Small
Power
24V
S- Single
A
Product
Series
1R2
Output
Voltage
A- Advanced 1R2-1.2V
1R5-1.5V
1R8-1.8V
2R5-2.5V
3R3- 3.3V
050- 5.0V
120- 12.0V
12
Output
Current
03- 3.0A
06- 6.6A
10- 10A
12- 12A
N
ON/OFF
Logic
N- Negative
P- Positive
R
Pin Type
F
A
Option
Code
R- SMD
F- RoHS 6/6 A-6 pins, no
T- Through hole (Lead Free) sense
B-8 pins, with
sense
MODEL LIST
MODEL NAME
S24SA1R212NRFA
S24SA1R512NRFA
S24SA1R812NRFA
S24SA2R510NRFA
S24SA3R310NRFA
S24SA05006NRFA
S24SA12003NRFA
INPUT
18V~36V
18V~36V
18V~36V
18V~36V
18V~36V
18V~36V
18V~36V
OUTPUT
2.2A
2.2A
2.2A
3.2A
3.2A
3.2A
3.2A
1.2V
1.5V
1.8V
2.5V
3.3V
5.0V
12V
EFF @ 100% LOAD
12A
12A
12A
10A
10A
6.6A
3.0A
85.5%
87.0%
87.5%
88.5%
90.0%
90.0%
89.5%
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
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.
13
14
DS_S24SA1R212_05102006