SLAN-40E1ALR [BEL]
4.5 â 14.4 VDC Input;
| 型号： | SLAN-40E1ALR |
| 厂家： | 
BEL FUSE INC. |
| 描述： | 4.5 â 14.4 VDC Input |
| 文件： | 总27页 (文件大小：1305K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
The SLAN-40E1A modules are non-isolated DC-DC converters that can
deliver up to 40 A of output current. These modules operate over a wide
range of input voltage (VIN = 4.5 - 14.4 VDC) and provide a precisely
regulated output voltage from 0.6 to 2.0 VDC, programmable via an external
resistor.
Features include remote on/off, adjustable output voltage, over current and
overtemperature protection. The module also includes the Tunable LoopTM
feature that allows the user to optimize the dynamic response of the
converter to match the load with reduced amount of output capacitance
leading to savings on cost and PWB area.
4.5 – 14.4 VDC Input
0.6 – 2.0 VDC / 40 A Output
Power Good Signal
Remote On/Off
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Over temperature protection
Class II, Category 2, Isolated DC/DC Converter (refer to IPC-9592B)
Compliant to RoHS EU Directive 2002/95/EC
Compatible in a Pb-free or SnPb Reflow Environment
Output Voltage Programmable from 0.6 to 2.0 VDC via External Resistor
Tunable LoopTM to Optimize Dynamic Output Voltage Response
Output Over-Current Protection (non-latching)
Wide Operating Temperature Range [-40°C to 85°C]
Wide Input Voltage Range (4.5 - 14.4 VDC).
Approved to IEC/EN 60950-1
Small size:33.02 ×13.46 × 10.9 mm (1.3 × 0.53 × 0.429 inch)
Cost Efficient Open Frame Design
Ability to Sink and Source Current
Fixed Switching Frequency with Capability of External Synchronization
Distributed Power Architectures
Servers and Storage Applications
Intermediate Bus Voltage Applications
Networking Equipment
Telecommunications Equipment
Industrial Equipment
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•
•
•
•
•
2
SLAN-40E1A
MODEL
NUMBER
ACTIVE LOW
SLAN-40E1ALG
MODEL
NUMBER
ACTIVE HIGH
SLAN-40E1A0G
OUTPUT
VOLTAGE
INPUT
VOLTAGE
MAX. OUTPUT
CURRENT
MAX. OUTPUT
POWER
TYPICAL
EFFICIENCY
0.6 – 2.0 VDC
4.5 – 14.4 VDC
40 A
80 W
91.5%
SLAN-40E1ALR
SLAN-40E1A0R
NOTE: 1. Add “R” suffix at the end of the model number to indicate tape and reel packaging (Standard).
2. Add “G” suffix at the end of the model number to indicate tray packaging (Option).
3. For the SLAN-40E1A0, please contact your local Bel representative for availability.
S
LAN
-
40
E
1A
x
x
Mounting
type
Output
current
Input voltage
range
Sequencing or
not
Logic
status
Series code
Package
0 – Active High
G – Tray Package
Surface
mount
With
Sequencing
SLAN series
40 A
4.5 - 14.4 V
L – Active Low
R – Tape & Reel Package
PARAMETER
DESCRIPTION
MIN
TYP
15
UNITS
Continuous Input Voltage
Operating Ambient Temperature
Storage Temperature
Altitude
-0.3
-40
-55
-
V
See Thermal Considerations section
85
C
C
m
125
2000
NOTE: Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings
only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of
the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability.
PARAMETER
DESCRIPTION
MIN
TYP
-
MAX
UNIT
Operating Input Voltage
Input Current
4.5
14.4
V
A
VIN = 4.5 to 14 V, Io= Io max
-
-
-
-
-
24
-
Vo set = 0.6 VDC
Vo set = 2 VDC
54.7
104
12.5
VIN = 12 VDC, Io = 0,
module enabled
Input Current (no load)
mA
-
Input Stand-by Current
VIN = 12 V, module disabled
-
mA
5 Hz to 20 MHz, 1 μH source impedance; VIN =
0 to 14 V, Io = Io max; See Test Configurations
Input Reflected Ripple Current (pk-pk)
-
90
-
mAp-p
I2t Inrush Current Transient
-
-
-
1
-
A2s
dB
Input Ripple Rejection (120 Hz)
-60
NOTE: Unless otherwise indicated, specifications apply over entire operating input voltage range, resistive load, and temperature
conditions.
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3
SLAN-40E1A
PARAMETER
DESCRIPTION
MIN
TYP
MAX
UNIT
With 0.1% tolerance for external resistor used to set
output voltage
Over entire operating input voltage range, resistive load,
and temperature conditions until end of life
1. Selected by an external resistor
Output Voltage Set Point
-1.0
-
+1.0
%Vo set
%Vo set
Output Voltage
-3.0
0.6
-
-
+3.0
2.0
Adjustment Range
2.Some output voltages may not be possible depending
on the input voltage – see Feature Descriptions Section
V
Remote Sense Range
Line Regulation
-
-
-
-
0
-
-
-
-
-
0.5
6
V
mV
VIN = VIN min to VIN max
Io = Io min to Io max
Load Regulation
-
10
-
mV
Temperature Regulation
Output Current
Tref = Ta min to Ta max
In either sink or source mode
0.4
-
%Vo set
Adc
40
100
38
-
Output Ripple and Noise (pk-pk)
Output Ripple and Noise (rms)
Output Short-Circuit Current
50
20
2.1
mV
5 Hz to 20 MHz BW, VIN = VIN nom and Io = Io min to
Io max, Co = 0.1 µF // 22 µF ceramic capacitors)
mV
Vo ≤ 250 mV, Hiccup Mode
Arms
Case 1: On/Off input is enabled and then input power is
applied (delay from instant at which VIN = VIN min until
Vo = 10% of Vo set)
1.0
1.1
1.7
ms
µs
Turn-On Delay and Rise Times
(VIN=VIN nom, Io=Io max, Vo to
within ±1% of steady state.)
Case 2: Input power is applied for at least one second
and then the On/Off input is enabled (delay from instant
at which Von/Off is enabled until Vo = 10% of Vo set)
600
700
1800
VIN = VIN min to Vin max, Io = Io min to Io max, TA =
25°C. With or without maximum external capacitance
Time for Vo to rise from
Output Voltage Overshoot
Output Voltage Rise Time
-
1.5
1.5
3.0
2.2
%Vo set.
msec
1.2
10% of Vo set to 90% of Vo set
Without the Tunable LoopTM
With the Tunable LoopTM
With the Tunable LoopTM
6x47
6x47
6x47
-
-
-
6x47
7000
8500
ESR≥ 1 mΩ
Output
Capacitance**
ESR≥0.15 mΩ
ESR≥ 10 mΩ
µF
1. Hiccup Mode
2.Current limit does not operate in sink mode
Output Current Limit Inception
-
150
-
% Io max
** External capacitors may require using the new Tunable LoopTM feature to ensure that the module is stable as well as getting the
best transient response. See the Tunable LoopTM section for details.
NOTE: All specifications are typical at nominal input, full load at 25°C unless noted.
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BCD.20104_AG
4
SLAN-40E1A
PARAMETER
Efficiency
DESCRIPTION
Vo = 0.6 V
MIN
78.0
84.0
85.25
380
TYP
81.3
88.5
91.5
400
MAX
UNIT
-
Vin = 12 VDC, TA = 25°C
Io = Io max, Vo = Vo set
-
%
Vo = 1.2 V
-
Vo = 1.8 V
420
kHz
kHz
Switching Frequency
Synchronization Frequency
Range
350
-
480
2.0
-
-
-
-
0.4
100
-
V
V
High-Level Input Voltage
Low-Level Input Voltage
Input Current, SYNC
nA
ns
ns
C
100
100
123
-
-
-
Minimum Pulse Width, SYNC
Maximum SYNC Rise Time
Over Temperature Protection
-
See Thermal Considerations section
Power-Up: 0.5 V/ms
130
-
137
100
100
113
115
97
mV
Tracking Accuracy
-
-
Power-Down: 0.5 V/ms
%Vo set
%Vo set
%Vo set
%Vo set
Overvoltage threshold for PGOOD ON
Overvoltage threshold for PGOOD OFF
Undervoltage threshold for PGOOD ON
Undervoltage threshold for PGOOD OFF
Pulldown resistance of PGOOD pin
Sink current capability into PGOOD pin
103
105
87
108
110
92
90
-
Signal Interface
Open Drain,
Vsupply 5VDC
PGOOD (Power Good)
85
95
-
50
mA
-
-
5
g
Weight
-
11.7
4.25
3.98
0.3
-
Turn-on Threshold
Turn-off Threshold
Hysteresis
4.144
3.947
0.25
4.407
4.163
0.35
V
Input Undervoltage Lockout
Calculated MTBF (Io = 0.8 Io max, TA = 40°C)
Telecordia Issue 2 Method 1 Case 3
MTBF*
6,498,438
hours
1.30 ×0.53×0.429
33.02×13.46×10.9
inch
mm
Dimensions (L × W × H)
NOTE: Unless otherwise indicated, specifications apply over entire operating input voltage range, resistive load, and temperature
condition.
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5
SLAN-40E1A
90
95
90
85
80
75
70
85
Vin=4.5V
Vin=4.5V
Vin=12V
Vin=14.4V
80
75
70
Vin=12V
Vin=14V
0
10
20
30
40
0
10
20
30
40
OUTPUT CURRENT, IO (A)
Figure 1. Vo = 0.6 V
OUTPUT CURRENT, IO (A)
Figure 2. Vo = 1.2 V
100
Vin=12V
95
90
85
80
75
70
Vin=4.5V
Vin=14.4V
0
10
20
30
40
OUTPUT CURRENT, IO (A)
Figure 3. Vo = 1.8 V
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BCD.20104_AG
6
SLAN-40E1A
45
40
35
30
25
20
15
45
40
35
30
25
20
15
10
NC
NC
0.5m/s
(100LFM)
0.5m/s
(100LFM)
1m/s
(200LFM)
1m/s
(200LFM)
1.5m/s
(300LFM)
1.5m/s
(300LFM)
Standard Part
(85 C)
Standard Part
(85 C)
2m/s
(400LFM)
Ruggedized (D)
Part (105 C)
2m/s
(400LFM)
Ruggedized (D)
Part (105 C)
45
55
65
75
85
95
105
45
55
65
75
85
95
105
AMBIENT TEMPERATURE, TA OC
AMBIENT TEMPERATURE, TA OC
Figure 4. Vo = 0.6 V
Figure 5. Vo = 1.2 V
45
40
35
30
25
20
15
10
NC
0.5m/s
1m/s
(200LFM)
(100LFM)
1.5m/s
2m/s
Standard Part
(85 C)
(400LFM)
Ruggedized (D)
Part (105 C)
5
45
55
65
75
85
95
105
AMBIENT TEMPERATURE, TA OC
Figure 6. Vo = 1.8 V
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7
SLAN-40E1A
TIME, t (1s/div)
Figure 7. Vo = 0.6 V, Io = Io, max, Vin = 12 V
TIME, t (1s/div)
Figure 8. Vo = 1.2 V, Io = Io, max, Vin = 12 V
TIME, t (1s/div)
Figure 9. Vo = 1.8 V, Io = Io, max, Vin = 12 V
NOTE: Co = 6x 47 µF ceramic.
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8
SLAN-40E1A
Figure 10. Start-up Using On/Off Voltage
(Io = Io max), Vo = 0.6 V
Figure 11. Start-up Using On/Off Voltage
(Io = Io max), Vo = 1.2 V
Figure 12. Start-up Using On/Off Voltage
(Io = Io max), Vo = 1.8 V
Figure 13. Start-up Using Input Voltage
(VIN = 12V, Io = Io max), Vo = 0.6 V
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9
SLAN-40E1A
Figure 14. Start-up Using Input Voltage
(VIN = 12V, Io = Io max), Vo = 1.2 V
Figure 15. Start-up Using Input Voltage
(VIN = 12V, Io = Io max), Vo = 1.8 V
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10
SLAN-40E1A
Figure 16. Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout = 12x 680 µF + 6x 47 µF,
CTune = 47 nF, RTune = 180 ohms, Vo = 0.6 V
Figure 17. Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout = 6x 330 µF,
CTune = 12 nF & RTune = 200 ohms, Vo = 1.2 V
Figure 18. Transient Response to Dynamic Load Change from 50% to 100% at 12Vin,
Cout = 6x 330 µF, CTune = 5.6 nF & RTune = 220 ohms, Vo = 1.8 V
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11
SLAN-40E1A
The SLAN-40E1Ax module should be connected to a low ac-impedance source. A highly inductive source can affect the stability
of the module. An input capacitance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage
and ensure module stability.
To minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. Figure 19 shows the input ripple
voltage for various output voltages at 40 A of load current with 4x22 µF, 6x22 µF or 8x22 µF ceramic capacitors and a 12 V input.
400
4x22uF Ext Cap
350
300
250
200
150
100
50
6x22uF Ext Cap
8x22uF Ext Cap
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Output Voltage (Volts)
Figure 19.
NOTE: Input ripple voltage for various output voltages with various external ceramic capacitors at the input (40 A load). Input voltage is 12
V. Scope Bandwidth limited to 20 MHz.
These modules are designed for low output ripple voltage and will meet the maximum output ripple specification with 0.1 µF ceramic
and 47 µF ceramic capacitors at the output of the module. However, additional output filtering may be required by the system
designer for a number of reasons. First, there may be a need to further reduce the output ripple and noise of the module. Second,
the dynamic response characteristics may need to be customized to a particular load step change.
To reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at the output can be
used. Low ESR polymer and ceramic capacitors are recommended to improve the dynamic response of the module. Figure 20
provides output ripple information for different external capacitance values at various Vo and a full load current of 40A. For stable
operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical
specification table. Optimal performance of the module can be achieved by using the Tunable LoopTM feature described later in this
data sheet.
40
6x47uF Ext Cap
8x47uF Ext Cap
30
10x47uF Ext Cap
20
10
0
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Output Voltage(Volts)
Figure 20.
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12
SLAN-40E1A
NOTE: Output ripple voltage for various output voltages with external 6x47 µF, 8x47 µF or 10x47 µF ceramic capacitors at the output (40 A
load). Input voltage is 12 V. Scope Bandwidth limited to 20 MHz.
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SLAN-40E1A
For safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the
end-use safety agency standards, i.e., UL 60950-1 2nd, CSA C22.2 No. 60950-1-07.
For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV
requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV.
The input to these units is to be provided with a fast-acting fuse with a maximum rating of 30 A, 100 V (for example, Bel Fuse SMM
series) in the positive input lead.
PARAMETER
DESCRIPTION
MIN
-0.2
2
TYP
MAX
0.4
UNIT
Signal Low (Unit On)
Signal High (Unit Off)
Signal Low (Unit Off)
Signal High (Unit On)
-
-
-
-
Active Low
Active High
The remote on/off pin open, Unit on.
V
VIN, max
0.4
-0.3
3.5
The remote on/off pin open, Unit on.
V
VIN, max
The SLAN-40E1Ax modules feature an On/Off pin for remote On/Off operation. Two On/Off logic options are available. In the
Positive Logic On/Off option, (device code suffix “0” – see Ordering Information), the module turns ON during a logic High on the
On/Off pin and turns OFF during a logic Low. With the Negative Logic On/Off option, (device code suffix “L” – see Ordering
Information), the module turns OFF during logic High and ON during logic Low. The On/Off signal should be always referenced to
ground. For either On/Off logic option, leaving the On/Off pin disconnected will turn the module ON when input voltage is present.
For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 21.
For negative logic On/Off modules, the circuit configuration is shown in Figure 22.
MODULE
MODULE
PWM Enable
VIN+
VIN+
PWM Enable
Rpullup
Rpullup
Internal
Pullup
I
ON/OFF
Internal
Pullup
470
10K
I
CR1
ON/OFF
V
ON/OFF
Q3
+
22K
22K
V
+
ON/OFF
470
10K
Q1
ON/OFF
10K
ON/OFF
Q1
10K
GND
_
GND
_
Figure 21. Circuit configuration for using positive On/Off logic
Figure 22. Circuit configuration for using negative On/Off logic
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14
SLAN-40E1A
The module has monotonic start-up and shutdown behavior for any combination of rated input voltage, output current and operating
temperature range.
The module can start into a pre-biased output as long as the pre-bias voltage is 0.5 V less than the set output voltage.
The output voltage of the module is programmable to any voltage from 0.6 to 2.0 VDC by connecting a resistor between the Trim
and SIG_GND pins of the module. Certain restrictions apply on the output voltage set point depending on the input voltage. These
are shown in the Output Voltage vs. Input Voltage Set Point Area plot in Figure 23. The Upper Limit curve shows that for output
voltages lower than 1V, the input voltage must be lower than the maximum of 14.4 VDC. The Lower Limit curve shows that for
output voltages higher than 0.6V, the input voltage needs to be larger than the minimum of 4.5 VDC.
Figure 23.
NOTE: Output Voltage vs. Input Voltage Set Point Area plot showing limits where the output voltage can be set for different input voltages.
VIN(+)
VO(+)
VS+
ON/OFF
LOAD
TRIM
Rtrim
SIG_GND
VS─
Figure 24.
CAUTION: Do not connect SIG_GND to GND elsewhere in the layout. Circuit configuration for programming output voltage using
an external resistor.
Without an external resistor between Trim and SIG_GND pins, the output of the module will be 0.6 VDC. To calculate the value of
the trim resistor, Rtrim for a desired output voltage, should be as per the following equation:
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15
SLAN-40E1A
12
Vo − 0.6
Rtrim =
k
(
)
Rtrim is the external resistor in kΩ.
Vo is the desired output voltage.
Table 1 provides Rtrim values required for some common output voltages.
RTRIM (KΩ)
VO SET (V)
0.6
0.9
1.0
1.2
1.5
1.8
Open
40
30
20
13.33
10
Table 1.
The power module has a Remote Sense feature to minimize the effects of distribution losses by regulating the voltage between the
sense pins (VS+ and VS-). The voltage drop between the sense pins and the VOUT and GND pins of the module should not exceed
0.5V.
Output voltage margining can be implemented in the module by connecting a resistor, Rmargin-up, from the Trim pin to the ground
pin for margining-up the output voltage and by connecting a resistor, Rmargin-down, from the Trim pin to output pin for margining-
down. Figure 25. shows the circuit configuration for output voltage margining. The POL Programming Tool, available at
www.belfuse.com under the Downloads section, also calculates the values of Rmargin-up and Rmargin-down for a specific output
voltage and % margin. Please consult your local Bel representative for additional details.
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
Rtrim
Q1
SIG_GND
Figure 25. Circuit Configuration for margining Output voltage
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16
SLAN-40E1A
The power module includes a sequencing feature, EZ-SEQUENCE that enables users to implement various types of output voltage
sequencing in their applications. This is accomplished via an additional sequencing pin. When not using the sequencing feature,
leave it unconnected.
The voltage applied to the SEQ pin should be scaled down by the same ratio as used to scale the output voltage down to the
reference voltage of the module. This is accomplished by an external resistive divider connected across the sequencing voltage
before it is fed to the SEQ pin as shown in Fig. 26. In addition, a small capacitor (suggested value 100 pF) should be connected
across the lower resistor R1. For SLAN-40E1Ax module, the minimum recommended delay between the ON/OFF signal and the
sequencing signal is 10 ms to ensure that the module output is ramped up according to the sequencing signal. This ensures that
the module soft-start routine is completed before the sequencing signal is allowed to ramp up.
DLynx Module
V
SEQ
20K
SEQ
R1=Rtrim
SIG_GND
100 pF
Figure 26. Circuit showing connection of the sequencing signal to the SEQ pin
When the scaled down sequencing voltage is applied to the SEQ pin, the output voltage tracks this voltage until the output reaches
the set-point voltage. The final value of the sequencing voltage must be set higher than the set-point voltage of the module. The
output voltage follows the sequencing voltage on a one-to-one basis. By connecting multiple modules together, multiple modules
can track their output voltages to the voltage applied on the SEQ pin.
The module’s output can track the SEQ pin signal with slopes of up to 0.5 V/msec during power-up or power-down.
To initiate simultaneous shutdown of the modules, the SEQ pin voltage is lowered in a controlled manner. The output voltage of the
modules tracks the voltages below their set-point voltages on a one-to-one basis. A valid input voltage must be maintained until
the tracking and output voltages reach ground potential.
To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will shut down if the
overtemperature threshold of 145°C (type) is exceeded at the thermal reference point Tref. Once the unit goes into thermal shutdown
it will then wait to cool before attempting to restart.
At input voltages below the input undervoltage lockout limit, the module operation is disabled. The module will begin to operate at
an input voltage above the undervoltage lockout turn-on threshold.
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SLAN-40E1A
The module switching frequency can be synchronized to a signal with an external frequency within a specified range.
Synchronization can be done by using the external signal applied to the SYNC pin of the module as shown in Fig. 27, with the
converter being synchronized by the rising edge of the external signal. The Electrical Specifications table specifies the requirements
of the external SYNC signal. If the SYNC pin is not used, the module should free run at the default switching frequency.
If synchronization is not being used, connect the SYNC pin to GND.
MODULE
SYNC
+
─
GND
Figure 27. External source connections to synchronize switching frequency of the module
For additional power requirements, the SLAN-40E1Ax module is also equipped with paralleling capability. Up to five modules can
be configured in parallel, with active load sharing.
To implement paralleling, the following conditions must be satisfied.
1. All modules connected in parallel must be frequency synchronized where they are switching at the same frequency. This is done
by using the SYNC function of the module and connecting to an external frequency source. Modules can be interleaved to reduce
input ripple/filtering requirements.
2. The share pins of all units in parallel must be connected together. The path of these connections should be as direct as possible.
3. The remote sense connections to all modules should be made that to the same points for the output, i.e. all VS+ and VS- terminals
for all modules are connected to the power bus at the same points.
4. For converters operating in parallel, tunable loop components “RTUNE” and “CTUNE” must be selected to meet the required
transient specification. For providing better noise immunity, we recommend that RTUNE value to be greater than 300 Ω.
Some special considerations apply for design of converters in parallel operation:
When sizing the number of modules required for parallel operation, take note of the fact that current sharing has some tolerance.
In addition, under transient conditions such as a dynamic load change and during startup, all converter output currents will not be
equal. To allow for such variation and avoid the likelihood of a converter shutting off due to a current overload, the total capacity of
the paralleled system should be no more than 90% of the sum of the individual converters. As an example, for a system of three
converters in parallel, the total current drawn should be less than 90% of (3 x 40 A), i.e. less than 108 A.
All modules should be turned ON and OFF together. This is so that all modules come up at the same time avoiding the problem of
one converter sourcing current into the other leading to an overcurrent trip condition. To ensure that all modules come up
simultaneously, the on/off pins of all paralleled converters should be tied together and the converters enabled and disabled using
the on/off pin. Note that this means that converters in parallel cannot be digitally turned ON as that does not ensure that all modules
being paralleled turn on at the same time.
If digital trimming is used to adjust the overall output voltage, the adjustments need to be made in a series of small steps to avoid
shutting down the output. Each step should be no more than 20 mV for each module. For example, to adjust the overall output
voltage in a setup with two modules (A and B) in parallel from 1 to 1.1 V, module A would be adjusted from 1.0 to 1.02 V followed
by module B from 1.0 to 1.02 V, then each module in sequence from 1.02 to 1.04 V and so on until the final output voltage of 1.1 V
is reached.
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SLAN-40E1A
If the Sequencing function is being used to start-up and shut down modules and the module is being held to 0V by the tracking
signal then there may be small deviations on the module output. This is due to controller duty cycle limitations encountered in trying
to hold the voltage down near 0 V.
The share bus is not designed for redundant operation and the system will be non-functional upon failure of one of the units when
multiple units are in parallel. In particular, if one of the converters shuts down during operation, the other converters may also shut
down due to their outputs hitting current limit. In such a situation, unless a coordinated restart is ensured, the system may never
properly restart since different converters will try to restart at different times causing an overload condition and subsequent
shutdown. This situation can be avoided by having an external output voltage monitor circuit that detects a shutdown condition
and forces all converters to shut down and restart together.
When not using the active load share feature, share pins should be left unconnected.
The module provides a Power Good (PGOOD) signal that is implemented with an open-drain output to indicate that the output
voltage is within the regulation limits of the power module. The PGOOD signal will be de-asserted to a low state if any condition
such as over-temperature, overcurrent or loss of regulation occurs that would result in the output voltage going outside the specified
thresholds.
The default value of PGOOD ON thresholds are set at ±8% of the nominal Vset value, and PGOOD OFF thresholds are set at ±10%
of the nominal Vset. For example, if the nominal voltage (Vset) is set at 1.0 V, then the PGOOD ON thresholds will be active anytime
the output voltage is between 0.92 V and 1.08 V, and PGOOD OFF thresholds are active at 0.90V and 1.10 V respectively.
The PGOOD terminal can be connected through a pull-up resistor (suggested value 100 k) to a source of 5 VDC or lower.
Identical dimensions and pin layout of Analog and Digital modules permit migration from one to the other without needing to change
the layout. In both cases the trim resistor is connected between trim and signal ground.
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19
SLAN-40E1A
The module has a feature that optimizes transient response of the module called Tunable LoopTM
.
External capacitors are usually added to the output of the module for two reasons: to reduce output ripple and noise (see Figure
20) and to reduce output voltage deviations from the steady-state value in the presence of dynamic load current changes. Adding
external capacitance however affects the voltage control loop of the module, typically causing the loop to slow down with sluggish
response. Larger values of external capacitance could also cause the module to become unstable.
The Tunable LoopTM allows the user to externally adjust the voltage control loop to match the filter network connected to the output
of the module. The Tunable LoopTM is implemented by connecting a series R-C between the VS+ and TRIM pins of the module, as
shown in Fig. 28. This R-C allows the user to externally adjust the voltage loop feedback compensation of the module.
VOUT
VS+
RTune
CO
MODULE
CTune
TRIM
RTrim
SIG_GND
GND
Figure 28. Circuit diagram showing connection of RTUNE and CTUNE to tune the control loop of the module
Recommended values of RTUNE and CTUNE for different output capacitor combinations are given in Table 2. Table 2 shows the
recommended values of RTUNE and CTUNE for different values of ceramic output capacitors up to 1000µF that might be needed for an
application to meet output ripple and noise requirements. Selecting RTUNE and CTUNE according to Table 2 will ensure stable operation
of the module.
In applications with tight output voltage limits in the presence of dynamic current loading, additional output capacitance will be
required. Table 3 lists recommended values of RTUNE and CTUNE in order to meet 2% output voltage deviation limits for some common
output voltages in the presence of a 20 to 40 A step change (50% of full load), with an input voltage of 12 V.
Please contact your Bel Power technical representative to obtain more details of this feature as well as for guidelines on how to
select the right value of external R-C to tune the module for best transient performance and stable operation for other output
capacitance values.
Co
6x 47 F
330 Ω
8x 47 F
330 Ω
10x 47 F
330 Ω
12x 47 F
330 Ω
20x 47 F
200 Ω
RTUNE
CTUNE
330 pF
820 pF
1200 pF
1500 pF
3300 pF
Table 2.
General recommended values of of RTUNE and CTUNE for Vin=12 V and various external ceramic capacitor combinations.
Vo
1.8 V
1.2 V
0.6 V
Co
4x 47 µF + 6x 330 µF polymer
4x 47 µF + 11x 330 µF polymer
4x 47 µF + 12x 680 µF polymer
220 Ω
5600 pF
34 mV
200 Ω
12 nF
22 mV
180 Ω
47 nF
12 mV
RTUNE
CTUNE
V
Table 3.
Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 20 A step load with Vin=12 V.
NOTE: The capacitors used in the Tunable Loop tables are 47 μF/3 mΩ ESR ceramic, 330 μF/12 mΩ ESR polymer capacitor and 680 μF/12
mΩ polymer capacitor.
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SLAN-40E1A
Power modules operate in a variety of thermal environments; however, sufficient cooling should always be provided to help ensure
reliable operation.
Considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction
in the operating temperature of the module will result in an increase in reliability. The thermal data presented here is based on
physical measurements taken in a wind tunnel. The test set-up is shown in Figure 29. The preferred airflow direction for the module
is in Figure 30.
25.4_
Wind Tunnel
PWBs
(1.0)
Power Module
76.2_
(3.0)
x
Probe Location
for measuring
airflow and
12.7_
(0.50)
ambient
temperature
Air
flow
Figure 29. Thermal Test Setup
Figure 30. Preferred airflow direction and location of hot-spot of the module (Tref)
tech.support@psbel.com
21
SLAN-40E1A
Requirements:
Vin:
12 V
Vout:
1.8 V
Iout:
30 A max., worst case load transient is from 20 A to 30 A
1.5% of Vout (27 mV) for worst case load transient
1.5% of Vin (180 mV, p-p)
Vout:
Vin, ripple
Vin+
Vout+
VIN
VOUT
VS+
PGOOD
RTUNE
CTUNE
MODULE
SEQ
TRIM
CI3
CI2
CI1
CO3
CO1
CO2
RTrim
ON/OFF
SIG_GND
GND
VS-
GND
Figure 31.
CI1
Decoupling cap - 1x0.01F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01)
3x22F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20)
470F/16V bulk electrolytic
CI2
CI3
CO1
CO2
CO3
CTune
RTune
RTrim
Decoupling cap - 1x0.01F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01)
4 x 47µF/6.3V ceramic capacitor (e.g. Murata GRM31CR60J476ME19)
6 X330µF/6.3V Polymer (e.g. Sanyo Poscap)
5600pF ceramic capacitor (can be 1206, 0805 or 0603 size)
220 ohms SMT resistor (can be 1206, 0805 or 0603 size)
10k SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
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SLAN-40E1A
Figure 32.
Notes:
Dimensions are in mm [inch].
Tolerances: x.x mm 0.5 mm [ 0.02 inch] [unless otherwise indicated]
x.xx mm 0.25 mm [ 0.010 inch]
tech.support@psbel.com
23
SLAN-40E1A
Figure 33. Pins
PIN
1
FUNCTION
ON/OFF
VIN
PIN
11
12
13
14
15
16
17
18
19
FUNCTION
SIG_GND
VS-
2
3
SEQ
NC
4
GND
NC
5
VOUT
TRIM
SYNC
PG
6
7
VS+
NC
8
GND
NC
9
SHARE
GND
NC
10
Figure 34. Recommended pad layout
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SLAN-40E1A
The SLAN-40E1Ax modules are supplied in tape & reel as standard.
All Dimensions are in mm [inch].
Figure 35. Packaging details
Reel Dimensions:
Outside Dimensions: 330.2 mm (13.00”)
Inside Dimensions:
Tape Width:
177.8 mm (7.00”)
56.00 mm (2.205”)
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25
SLAN-40E1A
The SLAN-40E1Ax modules use an open frame construction and are designed for a fully automated assembly process. The
modules are fitted with a label designed to provide a large surface area for pick and place operations. The label meets all the
requirements for surface mount processing, as well as safety standards, and is able to withstand reflow temperatures of up to
300°C. The label also carries product information such as product code, serial number and the location of manufacture.
This module is not recommended for assembly on the bottom side of a customer board. If such an assembly is attempted,
components may fall off the module during the second reflow process.
The modules are lead-free (Pb-free) and RoHS compliant and fully compatible in a Pb-free soldering process. Failure to observe
the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability.
Power Systems will comply with J-STD-020 Rev. C (Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface
Mount Devices) for both Pb-free solder profiles and MSL classification procedures. This standard provides a recommended forced-
air-convection reflow profile based on the volume and thickness of the package (table 4-2). The suggested Pb-free solder paste is
Sn/Ag/Cu (SAC). For questions regarding LGA, solder volume; please contact Bel power for special manufacturing process
instructions.
The recommended linear reflow profile using Sn/Ag/Cu solder is shown in Fig. 48. Soldering outside of the recommended profile
requires testing to verify results and performance.
The SLAN-40E1Ax modules have a MSL rating of 2A.
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SLAN-40E1A
The recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in J-
STD-033 Rev. A (Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices). Moisture barrier bags
(MBB) with desiccant are required for MSL ratings of 2 or greater. These sealed packages should not be broken until time of use.
Once the original package is broken, the floor life of the product at conditions of 30°C and 60% relative humidity varies according
to the MSL rating (see J-STD-033A). The shelf life for dry packed SMT packages will be a minimum of 12 months from the bag
seal date, when stored at the following conditions: < 40° C, < 90% relative humidity.
300
Per J-STD-020 Rev. C
Peak Temp 260°C
250
Cooling
Zone
200
* Min. Time Above 235°C
15 Seconds
150
Heating Zone
1°C/Second
*Time Above 217°C
60 Seconds
100
50
0
Reflow Time (Seconds)
Figure 36. Recommended linear reflow profile using Sn/Ag/Cu solder
Post solder cleaning is usually the final circuit board assembly process prior to electrical board testing. The result of inadequate
cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit board assembly. For
guidance on appropriate soldering, cleaning and drying procedures, refer to Board Mounted Power Modules: Soldering and
Cleaning Application Note (AN04-001).
tech.support@psbel.com
27
SLAN-40E1A
DATE
REVISION
CHANGES DETAIL
APPROVAL
2012-09-11
2012-12-11
A
B
First release
HL.LU
HL.LU
Update paralleling with active load sharing.
Update output capacitance, synchronization frequency range, safety considerations,
analog output voltage programming, Tunable Loop, example application circuit, MSL
rating; add transient waveforms, power good section.
2013-07-16
C
XF.Jiang
2013-08-01
2015-07-17
D
E
Update the Over temperature Protection
XF.Jiang
XF.Jiang
Update part selection, absolute maximum ratings, output specifications, general
specifications, paralleling with active load sharing, tunable loop and packaging details.
2018-06-21
2021-05-27
AF
Update Output Specs and Remote on/off. add Power Good
XF.Jiang
XF.Jiang
AG
Add object ID. Delete safety considerations about VDE information.
For more information on these products consult: tech.support@psbel.com
NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems,
equipment used in hazardous environments, or nuclear control systems.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the
date manufactured. Specifications are subject to change without notice.
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