TECHNICAL DATASHEET
LANC4812W12
DC/DC Converter
36-75 VDC Input
12 VDC Output at 1.0A
Features:
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UL
TUV
CB
CE MARK
RoHS Compliant
Single Output
Standard 24 Pin DIP and SMT Package
Five-Sided Continuous Shield
No Minimum Load Required
High Power Density
High Efficiency up to 88%
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
Input Under-Voltage Protection
Output Over-Voltage Protection
Over-Current Protection
Output Short Circuit Protection
Remote ON/OFF
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Applications:
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Distributed Power Architectures
Communications Equipment
Computer Equipment
Work Stations
•
Description:
The LANCW12 single output series offers 12 watts of output power from a package in an IC compatible 24pin
DIP and SMT configuration. LANCW12 single output series has 2:1 wide input voltage of 9-18VDC, 18-
36VDC, and 36-75VDC. The LANCW12 single 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
LANC4812W12
Technical Specifications
All specifications are based on 25 C, 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
400
kHz
INPUT (V
in
)
Operating Voltage Range
36
48
75
Vdc
Input Voltage (Continuous)
80
Vdc
Input Voltage (Transient 100ms)
100
Vdc
UVLO Turn-on Threshold
36
Vdc
UVLO Turn-off Threshold
33
Vdc
Input Standby Current
Nominal Vin and No Load
11
mA
Input Voltage Variation
Complies with EST300 132 part 4.4
5
V/ms
Input Current
Nominal Vin and Full Load
301
mA
5 to 20MHz, 12µH source impedance
Reflected Ripple Current
20
mA
pk-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 (V
o
)
Operating Output Range
Nominal Vin and Full Load
11.856
12
12.144 Vdc
Load Regulation (DIP Type)
0% to 100% Full Load
-0.5
+0.5
%
Load Regulation (SMT Type)
0% to 100% Full Load
-1.0
+1.0
%
Line Regulation
LL to HL at Full Load
-0.2
+0.2
%
5Hz to 20MHz bandwidth
Output Ripple & Noise
85
mV
pk-pk
(See the Test Setup section - pg 8)
Output Current
0
1.0
A
Output Voltage Overshoot
LL to HL at Full Load
0
3
% Vout
Over Voltage Protection
Zener diode clamp
15
Vdc
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)
250
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)
3.0
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
450
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
1200 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 % /
o
C
See the MTBF and Reliability section (pg 13)
MTBF
Bellcore TR-NWT-000332, T
C
=40°C
2,750,000
hours
MIL-STD-217F
1,080,000
hours
MECHANICAL
See Figure 1
Weight
18.0
grams
Dimensions
1.25 x 0.8 x 0.450
inches
o
Model No. LANC4812W12
(888) 597-WALL
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Page 2 of 14
TECHNICAL DATASHEET
LANC4812W12
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
0.08(2.0)
DIP Type
23
22
BOTTOM
VIEW
16
14
1
2
3
0.80 (20.3)
0.20 (5.1)
Table 1
Pin Connection
Pin
1
2
3
9
11
Define
CTRL
-Input
-Input
NC
NC
Pin
23
22
16
14
Define
+Input
+Input
-Output
+Output
1.25 (31.8)
9
11
0.15
(3.8)
0.40
(10.2)
0.60(15.2)
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
1.00(25.4)
0.92(23.4)
Suffix-S
0.44(11.2)
0.10 (2.54)
0.43(10.9)
Table 2
Pin Connection
Pin
1
2
3
Define
CTRL
-Input
-Input
NC
NC
NC
Pin
23
22
16
14
Others
Define
+Input
+Input
-Output
+Output
NC
0.02(0.5)
20
1.26 (32.0)
BOTTOM
VIEW
5
0.15 (3.81)
24
1
16
Pin Area
0.04 x 0.02
(1.0 x 0.5)
9
12
0.80(20.3)
0.25 (6.35)
9
11
Others
13
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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Page 3 of 14
TECHNICAL DATASHEET
LANC4812W12
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 LANCW12 single
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
Output Over Voltage Protection
The output over-voltage protection consists of an output Zener diode that monitors the voltage on the output
terminals. If the voltage on the output terminals exceeds the over-voltage protection threshold, then the Zener
diode clamps the output voltage.
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.
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TECHNICAL DATASHEET
LANC4812W12
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
TOP VIEW
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
Figure 6
Level Control using TTL Output
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Level Control using Line Voltage
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Page 5 of 14
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