LANC4812DW8 - Wall Industries

TECHNICAL DATASHEET
LANC4812DW8
DC/DC Converter
36-75 VDC Input
±12 VDC Output at ±0.333A
Features:
UL
TUV
CB
CE MARK
Applications:
•
RoHS Compliant
•
Dual Output
•
Standard 24 Pin DIP and SMT Package
•
Five-Sided Continuous Shield
•
No Minimum Load Required
•
High Power Density
•
High Efficiency up to 87%
•
Small Size: 1.25 x 0.8 x 0.450 Inches
•
Input to Output Isolation (1600VDC)
•
2:1 Wide Input Voltage Range
•
Fixed Switching Frequency
•
Distributed Power Architectures
•
Input Under-Voltage Protection
•
Communications Equipment
•
Over-Current Protection
•
Computer Equipment
•
Output Short Circuit Protection
•
Work Stations
•
Remote ON/OFF
Description:
The LANCW8 dual output series offers 8 watts of output power from a package in an IC compatible 24 pin DIP and SMT
configuration. LANCW8 dual output series has 2:1 wide input voltage of 9-18VDC, 18-36VDC, and 36-75VDC. The
LANCW8 dual output series features 1600VDC of isolation, short circuit protection, and five sided shielding. All models
are particularly suited for telecommunications, industrial, mobile telecom, and test equipment applications.
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TECHNICAL DATASHEET
LANC4812DW8
Technical Specifications
Model No. LANC4812DW8
All specifications are based on 25 oC, Nominal Input Voltage and Maximum Output Current unless otherwise noted.
We reserve the right to change specifications based on technological advances.
SPECIFICATION
Related condition
Min
Nom
Max
Unit
Switching Frequency
Test at nominal Vin and full load
300
kHz
INPUT (Vin)
Operating Voltage Range
36
48
75
Vdc
Input Voltage (Continuous)
80
Vdc
Input Voltage (Transient 100ms)
100
Vdc
Input Standby Current
Nominal Vin and No Load
18
mA
Input Voltage Variation
Complies with EST300 132 part 4.4
5
V/ms
Input Current
Nominal Vin and Full Load
200
mA
5 to 20MHz, 12µH source impedance
Reflected Ripple Current
20
mApk-pk
(See the Test Setup section - pg 8)
Test at nominal Vin and full load
87
%
EFFICIENCY
(See the Test Setup section – pg 8)
OUTPUT (Vo)
Operating Output Range
Nominal Vin and Full Load
11.88
12.0
12.12
Vdc
Load Regulation
0% to 100% Full Load
-1.0
+1.0
%
Line Regulation
LL to HL at Full Load
-0.2
+0.2
%
Cross Regulation
Asymmetrical Load 25% / 100% of Full Load
-5.0
+5.0
%
5Hz to 20MHz bandwidth
Output Ripple & Noise
50
mVpk-pk
(See the Test Setup section - pg 8)
Output Current
0
±0.333 A
Output Voltage Overshoot
LL to HL at Full Load
0
3
% Vout
Over Current Protection
150
% FL
Short Circuit Protection
Continuous, automatic recovery
Test at nominal Vin
DYNAMIC LOAD RESPONSE
Peak Deviation
Load step change from 75 to 100% or 100 to 75 % of FL
200
mV
Setting Time (Vout < 10% peak deviation)
200
µs
The ON/OFF pin voltage is referenced to -Vin
REMOTE ON/OFF
(See the Remote ON/OFF Control section - pg 5)
ON/OFF pin High Voltage (Remote ON)
3.5
12
Vdc
ON/OFF pin Low Voltage (Remote OFF)
0
1.2
Vdc
ON/OFF pin Low Voltage, input current
2.5
mA
Test at nominal Vin and constant resistive load
START UP TIME
Power Up
700
ms
Remote ON/OFF
5
ms
ISOLATION
Isolation Voltage (Input-Output)
1600
Vdc
Isolation Voltage (Output to Case–DIP Type)
1600
Vdc
Isolation Voltage (Output to Case–SMT Type)
1000
Vdc
Isolation Voltage (Input to Case - DIP Type)
1600
Vdc
Isolation Voltage (Input to Case - SMT Type)
1000
Vdc
Isolation Resistance
1
GΩ
Isolation Capacitance
300
pF
ENVIRONMENTAL
o
Operating Ambient Temperature (w/ derating)
-40
85
C
o
Operating Case Temperature
100
C
o
Storage Temperature
-55
105
C
Temperature Coefficient
-0.02
+0.02 % / oC
See the MTBF and Reliability section (pg 13)
MTBF
Bellcore TR-NWT-000332, TC=40°C
3,050,000
hours
MIL-STD-217F
1,880,000
hours
MECHANICAL
See Figure 1
Weight
18.0
grams
Dimensions
1.25 x 0.8 x 0.450
inches
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TECHNICAL DATASHEET
LANC4812DW8
Figure 1: Mechanical Dimensions
Pin size is 0.02(0.5) Dia or
0.01 x 0.02 (0.25 x 0.50) Rectangular Pin
DIP Type
0.08(2.0)
1
2
3
Pin Connection
16
9
14
11
0.20 (5.1)
BOTTOM
VIEW
1.25 (31.8)
Table 1
0.80 (20.3)
23
22
0.15
(3.8)
0.60(15.2)
0.40
(10.2)
Pin
1
2
3
Define
CTRL
-Input
-Input
Pin
Define
23
22
+Input
+Input
9
11
Common
-Output
16
14
Common
+Output
0.80(20.3)
1. All dimensions are in Inches (mm)
Tolerance: x.xx±0.02 (x.x±0.5)
2. Pin pitch tolerance ±0.014(0.35)
SMT Type
Suffix-S
0.44(11.2)
0.10 (2.54)
1.00(25.4)
Pin Area
0.04 x 0.02
(1.0 x 0.5)
BOTTOM
VIEW
5
16
9
13
12
0.80(20.3)
1.26 (32.0)
20
1
0.15 (3.81)
24
0.43(10.9)
Table 2
Pin Connection
Pin
1
2
3
Define
CTRL
-Input
-Input
Pin
Define
23
22
+Input
+Input
9
11
Others
Common
-Output
NC
16
14
Others
Common
+Output
NC
0.25 (6.35)
0.02(0.5)
0.92(23.4)
1. All dimensions in Inches (mm)
Tolerance: x.xx±0.02 (x.x±0.5)
2. Pin pitch tolerance ±0.014(0.35)
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TECHNICAL DATASHEET
LANC4812DW8
DESIGN CONSIDERATIONS:
Output Over Current Protection
When excessive output currents occur in the system, circuit protection is required on all power supplies.
Normally, overload current is maintained at approximately 150% of rated current for the LANCW8 dual output
series.
Fold back-mode is a method of operation in a power supply whose purpose is to protect the power supply from
being damaged during an over-current fault condition. It also enables the power supply to operate normally when
the fault is removed.
One of the problems resulting from over current is that excessive heat may be generated in power devices;
especially MOSFET and Schottky diodes and the temperature of those devices may exceed their specified limits.
A protection mechanism has to be used to prevent those power devices from being damaged.
The operation of fold back is as follows. When the current sense circuit sees an over-current event, the output
voltage of the module will be decreased for low power dissipation and decrease the heat of the module.
Figure 2
Input Source Impedance
The power module should be connected to a low impedance input source. Highly inductive source impedance
can affect the stability of the power module. Input external L-C filter is recommended to minimize input
reflected ripple current. The inductor is simulated source impedance of 12µH and capacitor is Nippon chemi-con
KZE series 47µF/100V. The capacitor must as close as possible to the input terminals of the power module for
lower impedance.
Thermal Consideration
The power module operates in a variety of thermal environments. However, sufficient cooling should be
provided to help ensure reliable operation of the unit. Heat is removed by conduction, convention, and radiation
to the surrounding environment. Proper cooling can be verified by measuring the point as the figure below. The
temperature at this location should not exceed 105°C. When operating, adequate cooling must be provided to
maintain the test point temperature at or below 105°C. Although the maximum point temperature of the power
modules is 105°C, you can limit this temperature to a lower value for extremely high reliability.
Figure 3
Measurement shown in inches and millimeters
0.4 (10.15)
TOP VIEW
0.625 (15.9)
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TECHNICAL DATASHEET
LANC4812DW8
Remote ON/OFF Control
The positive logic remote ON/OFF control circuit is included.
Turns the module ON during a logic High on the On/Off pin and turns OFF during a logic Low. The On/Off pin
is an open collector/drain logic input signal (Von/off) that’s referenced to GND. If not using the Remote On/Off
feature, please open circuit between on/off pin and –input pin to turn the module on.
Remote ON/OFF Implementation
Figure 4
Isolated-Closure Remote ON/OFF
Figure 5
Level Control using TTL Output
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Figure 6
Level Control using Line Voltage
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TECHNICAL DATASHEET
LANC4812DW8
Graph 2: Efficiency vs. Input Voltage (Full Load)
Efficiency (%)
Efficiency (%)
Graph 1: Efficiency vs. Output Current
Vin=36V
Vin=48V
Vin=75V
% Of Full Load
Input Voltage (V)
Graph 4: Power Dissipation Vs. Output Current
Power Dissipation (W)
Output Power (%)
Graph 3: Output Power vs. Ambient Temperature & Airflow
(Nominal Vin)
Natural Convection
100LFM
200LFM
300LFM
400LFM
500LFM
36V
48V
75V
Ambient Temperature, Ta (°C)
% Of Full Load
Graph 5: Conducted Emission of EN55022 Class A
(Nominal Vin and Full Load)
Graph 6: Conducted Emission of EN55022 Class B
(Nominal Vin and Full Load)
Frequency
Frequency
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TECHNICAL DATASHEET
LANC4812DW8
Graph 7: Typical Input Start-Up and Output Rise Characteristic
(Nominal Vin and Full Load)
Graph 8: Typical Output Ripple and Noise
(Nominal Vin and Full Load)
Vin
Vout
Graph 9: Using ON/OFF Voltage Start-Up and Vo Rise
Characteristic (Nominal Vin and Full Load)
Graph 10: Transient Response to Dynamic Load Change from
100% to 75% to 100% of Full Load at Nominal Vin
Von-off
Vout
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TECHNICAL DATASHEET
LANC4812DW8
TEST SETUP:
The LANC4812DW8 specifications are tested with the following configurations:
Input Reflected-Ripple Current Measurement Test Setup
Figure 7
Component
L
C
Value
12µH
47µF
Voltage
---100V
Reference
---Aluminum Electrolytic Capacitor
Peak-to-Peak Output Ripple & Noise Measurement Setup
Figure 8
Figure 9
Output Voltage and Efficiency Measurement Setup
Figure 10
 Vout × Iout 
Efficiency = 
 × 100%
 Vin × Iin 
NOTE: All measurements are taken at the module terminals
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TECHNICAL DATASHEET
LANC4812DW8
EMC Considerations
Suggested Schematic for EN55022 Conducted Emission Class A Limits
Figure 11
Recommended Layout with Input Filter
Figure 12
To meet Conducted Emissions EN55022 CLASS A needed the following components:
LANC12xxDW8
Component
C1
C2, C3
Value
Voltage
Reference
4.7uF
1000pF
25V
2KV
1210 MLCC
1206 MLCC
LANC24xxDW8
Component
C1
C2, C3
Value
Voltage
Reference
N/A
---
---
1000pF
2KV
1206 MLCC
LANC48xxDW8
Component
Value
Voltage
Reference
C1
N/A
---
---
1000pF
2KV
1206 MLCC
C2, C3
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TECHNICAL DATASHEET
LANC4812DW8
EMC Considerations (Continued)
Suggested Schematic for EN55022 Conducted Emission Class B limits
Figure 13
Recommended Layout with Input Filter
Figure 14
To meet Conducted Emissions EN55022 CLASS B needed the following components:
LANC12xxDW8
Component
C1
C3, C4
L1
Value
4.7µF
1000pF
325µH
Component
C1
C3, C4
L1
Value
6.8µF
1000pF
325µH
Component
C1, C2
C3, C4
L1
Value
2.2µF
1000pF
325µH
Voltage
50V
2KV
----
Reference
1812 MLCC
1206 MLCC
Common Choke, P/N: PMT-050
LANC24xxDW8
Voltage
50V
2KV
----
Reference
1812 MLCC
1206 MLCC
Common Choke, P/N: PMT-050
LANC48xxDW8
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Voltage
100V
2KV
----
Reference
1812 MLCC
1206 MLCC
Common Choke, P/N: PMT-050
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TECHNICAL DATASHEET
LANC4812DW8
Recommended Pad Layout for DIP Type
Figure 15
Recommended Pad Layout for SMT Type
Figure 16
1. All dimensions in Inches (mm)
2. Pin pitch tolerance ±0.35mm
3. Tolerance: x.xx±0.02 (x.x±0.5)
x.xxx±0.01 (x.xx±0.25)
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TECHNICAL DATASHEET
LANC4812DW8
Soldering and Reflow Considerations:
Lead Free Wave Solder Profile for DIP Type
TEMPERATURE (°C)
Reference Solder: Sn-Ag-Cu; Sn-Cu
Figure 17
Hand Welding:
Soldering Iron: Power 90W
Welding Time: 2~4 sec
Temp: 380~400°C
TIME (SEC)
Zone
Preheat
Zone
Actual
Heating
Reference Parameter
Rise temp. speed: 3℃/sec max.
Preheat temp: 100~130℃
Peak temp: 250~260℃
Peak time (T1+T2 time): 4~6 sec
Figure 18
TEMPERATURE (°C)
Lead free reflow profile for SMT type
TIME (SEC)
Zone
Preheat
Zone
Actual
Heating
Cooling
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Reference Parameter
Reference Solder: Sn-Ag-Cu; Sn-Cu
Rise temp. speed: 1~3℃/sec
Preheat time: 60~120sec
Preheat temp.155~185℃
Rise temp. speed: 1~3℃/sec
Melting time: 30~60 sec
Melting temp: 217°C
Peak temp: 230~240℃
Peak time: 10~20 sec
Rise temp. speed: -1~ -5℃/sec
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TECHNICAL DATASHEET
LANC4812DW8
Packaging Information:
DIP Type
Figure 19
16 PCS per tube
SMT Type
Figure 20
16 PCS per tube
Safety and Installation Instruction:
Fusing Consideration
Caution: This power module is not internally fused. An input line fuse must always be used.
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone
operation to an integrated part of sophisticated power architecture. To maximum flexibility, internal fusing is not
included; however, to achieve maximum safety and system protection, always use an input line fuse. The safety
agencies require a normal-blow fuse with maximum rating of 3A. Based on the information provided in this data
sheet on inrush energy and maximum DC input current; the same type of fuse with lower rating can be used.
Refer to the fuse manufacturer’s data for further information.
MTBF and Reliability
The MTBF of the LANCW8 dual output series of DC/DC converters has been calculated using Bellcore
TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40°C (Ground fixed and controlled
environment). The resulting figure for MTBF is 3.053 × 106 hours.
MIL-HDBK 217F NOTICE2 FULL LOAD, Operating Temperature at 25°C. The resulting figure for MTBF is
1.878 × 106 hours.
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TECHNICAL DATASHEET
LANC4812DW8
Ordering Information:
Part Number Example:
LANC 48
12
D
W
8 - S
Series
Designation
Nominal Input
Voltage
Nominal Output
Voltage
Dual Output
2:1 Wide Input
Voltage Range
Option
No suffix
S
Description
DIP Type
SMT Type
Maximum Output
Power
Company Information:
Wall Industries, Inc. has created custom and modified units for over 40 years. Our in-house research and
development engineers will provide a solution that exceeds your performance requirements on-time and on
budget. Our ISO9001-2000 certification is just one example of our commitment to producing a high quality, well
documented product for our customers.
Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for
working closely with its customers to ensure each solution meets or exceeds form, fit and function requirements.
We will continue to provide ongoing support for your project above and beyond the design and production
phases. Give us a call today to discuss your future projects.
Contact Wall Industries for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
(888) 597-WALL
(603)778-2300
(888)587-9255
(603)778-9797
[email protected]
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
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