B70SR12424A - Delta Electronics

B70SR12424A
12V Output DC/DC Converter, Box Type Package
FEATURES

Wide input voltage range, 36~106V

300W Output

Full Load Efficiency up to 89.5% @48Vin;
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
Intergrated fuse holder

Parallel Connection of multiple units

Box type package with metal base plate

Package Dimension:
190.0x76.0x43.5mm (7.48”x2.99”x1.71”)

Operating Temperature Range - 40°C to +75°C

Input Reverse Polarity Protection

Minimized Inrush current

Input UVLO, Output OCL, Short circuit protection,
OVP, OTP

Enable on/off (option)

2250VDC Isolation

IP67 Protection

RoHs Compliant

ISO 9001, ISO 14001 certified manufacturing facility

UL60950

CE Mark

EMC compatible: EN12895

Electrical transient conduction: ISO7637-2
The B70SR12424A, a wide input voltage range of 36~106V, and single isolated output converter, is the latest product offering from a
world leader in power systems technology and manufacturing ― Delta Electronics, Inc. Such box type DCDC converter can provide 300W,
12.4V regulated DC output voltage with full load efficiency up to 90% @72Vin; The B70SR12424A offers input UVLO, output over current
limit, short circuit, output over voltage, over temperature, and input reverse polarity protections, It has an intergrated fuse holder. It also has
parallel function; and allows a wide operating temperature range of –40°C to +75°C. With creative design technology and optimization of
component placement, this converter possess outstanding electrical and thermal performance, as well as high reliability under extrmely harsh
operating conditions. The B70SR12424A meets IP67 protection (not include the connector and fuseholder).
Input Characteristics
Item
Condition
Continuous Input Voltage
Max Input voltage
126
VDC
VDC
31
32
22
VDC
1
2
3
VDC
Vin=36V, 100% Load
9.2
10
A
Vin=48V
35
60
mA
Vin=72V, 80V
25
50
mA
Lockout Hysteresis Voltage
Vin=72V, Vpp
Max Reverse Polarity Input Voltage
Max Inrush current
DS_B70SR12424A_10032013
VDC
35
Voltage Threshold
Internal Input Fuse
Unit
106
34
Input Under-Voltage Lockout, Turn-Off
Reflected input ripple current
Max.
72
33
Voltage Threshold
No-Load Input Current
Typ.
36
10 minutes, normal operating
Input Under-Voltage Lockout, Turn-On
Maximum Input Current
Min.
Ø 6.35mm*31.75mm
0.2
A
106
VDC
10
A
250V/25A Fast-acting fuse
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Output Characteristics
Item
Operating Output Current Range
Conditions
Output Voltage Set Point
Output Voltage Ripple and Noise,
Output Current Limit
Short current
Current share accuracy
Start-up time
Rise time
Output Voltage Protection
Output Voltage Current Transient
Maximum Output Capacitance
Output overshoot
Efficiency @ 100% Load
Efficiency @ 100% Load
Efficiency @ 100% Load
Efficiency @ 60% Load
Efficiency @ 60% Load
Efficiency @ 60% Load
12.6
Max.
24
12.8
Unit
A
V
Io=24A
12.0
12.2
12.4
V
100
150
mV
30
50
mV
150
200
mV
25
50
28
13
6
750
130
15
80
31
3.5
10
1000
200
17
mV
A
A
%
mS
mS
V
300
500
mV
300
500
mV
5000
3
µF
%
%
%
%
%
%
%
Max.
Unit
Vin=48V, Io=24A, peak to peak,
20MHz bandwidth
RMS
Vin=72V, 80V, Io=24A, peak to peak,
20MHz bandwidth
RMS
Vin=48V, Auto restart, RMS value
24A for each module
Positive voltage step, 18A to 12A load
dynamic, 0.1A/us slew rate
Nagetive voltage step, 12A to 18A load
dynamic, 0.1A/us slew rate
ESR>10mohm
General Characteristics
Item
87.5
88.0
88.0
88.0
88.3
88.3
89.5
90.0
90.0
90.0
90.3
90.3
Conditions
Min.
Typ.
2250
550
Parameter
VDC
VDC
MΩ
pF
KHz
Mhours
g
10
5000
175
4.3
900
Ta=25ºC, 80%load
Environmental Specifications
Storage Temperature Range
Operating Temperature Range
Maximum permitted meta plate temperature
Over Temperature Protection
Humidity (non condensing)
Water Protection Level
Vibration
Shock
Emission
Immunity
ESD
Typ.
Vin=48V
Vin=72V
Vin=80V
Vin=48V
Vin=72V
Vin=80V
Input to Output, Input to Case
Ouput to Case
Isolation Voltage,
Isolation Resistance, Input to Output
Isolation Capacitance, Input to Output
Switching Frequency
MTBF
Weight
Io=0
Min.
0
12.4
Conditions
Ambient Temperature
Vin=72V, Io=24A, Refer to figure20
NTC Temperature
Without connector&fuseholder
IEC 60068-2-6
IEC 60068-2-27
EN12895
EN12895, EN61000-4-3
EN12895, EN61000-4-2
Min.
Max.
Unit
-40
-40
+125
+75
95
℃
℃
℃
℃
% rel. H
122
95
IP67
10G/15~200HZ/3 PLANES
50G 3 PLANES
30-1000MHz 34-45dBuV/m
10V/m /27-1000MHz AM; 10V/m /900MHz PM
Direct: ±2KV ±4KV; Air: ±2KV ±4KV ±8KV
Notes
1
2
Specifications typical at Ta=+25℃, nominal input voltage and rated full load output current unless otherwise noted.
Specifications are subject to change without notice.
DS_B70SR12424A_10032013
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ELECTRICAL CURVES
Figure 1: Efficiency vs. Output current
@ Vin=48V,72V,80V
Figure 2: Loss vs. Output current
@ Vin=48V,72V,80V
Figure 3: Dynamic response to load step 12A~18A with
0.1A/uS slew rate at 72Vin
CH1:VOUT, 200mV/div, 200uS/div
Figure 4: Vout start up with Vin on at 72Vin,24A Iout,
TOP:VIN, 20V/div, 200mS/div
BOTTOM: VOUT, 5V/div, 200mS/div
Figure 5: Output ripple & noise at 72Vin, 24A Iout
CH1:VOUT, 100mV/div, 5uS/div
DS_B70SR12424A_10032013
Figure 6: Output over voltage protection at 72Vin, 24A Iout
CH1:VOUT, 10V/div, 50mS/div
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ELECTRICAL CURVES (continous)
Figure 7: Input current vs. Input voltage
@Full load
Figure 8: Output voltage vs. Output current
OCL Performance
Figure 9: Output voltage vs. Output current
@Vin=72V. Droop function.
Figure 10: Current share accuracy vs. Total output current
2 in parallel.
Figure 11: Output short current @Vin=72V
CH1:Io, 20A/div, 200mS/div
DS_B70SR12424A_10032013
Figure 12: Inrush current @ Vin=72V
CH1:Iin, 2A/div, 200nS/div; Max current 4.3A, I2t=1.5E-7 A²S
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FEATURES DESCRIPTIONS
Output Over-Current Limit and Short Protection
The modules include internal output over-current limit (OCL) and short circuit protection (SCP) circuits, the
OCL set point is lower than that of the SCP; The response of SCP circuit is much fast than that of the OCL
circuit. The slowly increase of the output current will let module enter OCL protection when the current exceeds
the OCL set point, while the fast increase of the output current will let module enter SCP when the current
exceeds the SCP set point.
When the modules enter OCL protection, the output voltage will decrease while the output current is kept
constant, the output voltage will soft start to set point when the overload condition is removed.
The module will enter hiccup mode when it triggers the SCP set point. The module 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 removed.
Output Over-Voltage Protection
The power module includes an internal output over-voltage protection(OVP) circuit, which monitors the voltage
on the output terminals. If this voltage exceeds the OVP set point, the module will shut down, and then restart
after a fixed delay time (hiccup mode), please refer to figure6 for detail.
Over-Temperature Protection
The over-temperature protection consists of circuitry that provides protection from thermal damage. If the
temperature exceeds the preset temperature threshold the module will shut down,and all components will not
exceed their absolute maximum temperature ratings.The module will restart after the temperature is within
specification.
Remote On/Off
B70SR12424A has an option for Enable control. An additional PIN need to added to achieve this function.
This Enable PIN is designed on the primary side of converter, the converter will turn on when the Enable PIN
connected to VIN+, and turn off when the Enable PIN connected to VIN- or floating.
Delta can change the 4PIN connector to a 5PIN connector to achieve the enable function, please contact us if
you need this function.
B70SR12424
Enable
VIN+
VINVo+
Vo-
Figure 13: suggested Enable connection
Input Reverse Voltage Protection
The input reverse voltage protection is provided by an diode on the input line, the standoff voltage for the
reverse protection shall be no less than -106V.
DS_B70SR12424A_10032013
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DESIGN CONSIDERATIONS
Parallel connection of multiple units
Two units parallel operation is verified, please contact Delta if more than two units need to be paralleled.
While parallelling multiple units, the impedance of the cables from unit to junction point of each unit should be
within ±5% of each other.
Unit1
Unit1
Load
Load
Unit2
Unit2
Figure 14: suggested parallel connections
EMC
The converter has the internal EMI filters and meet the EMC standards EN12895 30-1000MHz
34-45dBuV/m.The test result is showed as below
Conditions: Vin=72V, Io=24A, 10m measure distance
Figure 15: test result(Vertical)
Figure 16: test result(Horizontal)
Fuse replacement
The module has the intergratted the fuse holder, when the fuse needs to be replaced, it can be taked down in an
anticlockwise direction by slotted type screwdrivers .
Recommended fuse replacement P/N:
Littlefuse 0314025.MXP
DS_B70SR12424A_10032013
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THERMAL CONSIDERATION
The following figure shows the location to monitor the temperature of base plate. Before customer decides to
use this DCDC converter, a thermal evaluation need to be did to make sure the temperature of base plate is
lower than that read from below thermal curves (Figure18~20 base on different input voltage).
Figure 17: Thermal consideration
THERMAL CURVE
AOS
Figure 18: Output Current vs. base plate temperature
DS_B70SR12424A_10032013
@Vin=48V
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THERMAL CURVES
AOS
Figure 19: Output Current vs. base plate temperature
@Vin=72V
AOS
Figure 20: Output Current vs. base plate temperature
DS_B70SR12424A_10032013
@Vin=80V
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Mechanical Drawing
Mechanical Dimensions
Pin Connections
Pin
Function Description
1
OUTPUT -
2
OUTPUT +
3
INPUT -
4
INPUT +

All dimensions in mm (inches)

Tolerance:X.X±0.5 (X.XX±0.02)

Connector:
MOLEX MINI-FIT SrTM Header
X.XX±0.25 ( X.XXX±0.010)
(MOLEX P/N :42819-4213)
Physical Outline
Case Size
Case Material
:
:
DS_B70SR12424A_10032013
190.0x76.0x43.5 mm (7.48”x2.99”x1.71”)
Case: PC; Plate: AL6063
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Part Numbering System
B
70
S
R
124
24
A
Form
Factor
Input
Voltage
Number
of
Outputs
Product
Series
Output
Voltage
Output
Current
Option Code
BBox
70 –
36V~106V
S–
Single
R–
Regular
124 –
12.4V
24 –
24A
C
Option
Fitting
With
Built-in
fuse
holder
Enable
pin
Sealed
connector
& fuse
holder
A
YES
NO
NO
B
YES
NO
YES
C
NO
YES
NO
D
NO
NO
NO
Connector Kit
1xhousing+ 4
terminals
Model List
Input Voltage Range
B70SR12424(A\B\C\D)
Input
36V~106V
EFF @72VIN 100%
LOAD
Output
10A
12.4V
24A
90.0%
WARRANTY
Delta offers a three (2) years 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_B70SR12424A_10032013
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