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DTL5A-LC
OBSOLETE PRODUCT
Features
DATEL's DTL5A-LC is a serial-input controlled electronic loads featuring a low
compliance voltage operation (down to 0.6 Volts)! Similar to DATEL's DTL3A, the
DTL5A-LC also offers a loading current range of 0 to 2.0A full scale range with a loading
voltage to 50V. The DTL5A-LC's ability to operate down to 0.6 Volts, allows this device to
be used with next-generation, low-voltage output power supplies. The DTL3A's
compliance voltage operates from 2.5 Volts to 50 Volts, sufficient for today's 2.5V, 3.3V, 5
Volt, etc., power product voltages, with improved gain specifications.
· Serial-input controlled
· 100 watts maximum load capacity
· 0.6 to 50V, 0 to 2.0A capability
· Parallel load capability for higher
current and power applications
· Dynamic loading to 20 kHz
· Compliance Voltage down to 0.6 Volts
Applications
· Power supply test and characterization
· Dynamic power supply burn-in
· Battery capacity testing
· Current source testing
· Capacitor discharge testing
· Power resistor substitution
100 Watt, Serial-Input
Electronic Load
Low Compliance Version
The small but efficient heat transfer package allows up to 100W of power dissipation
by using external heatsinking. The devices are packaged in a small 2" x 2" x 0.4" metal
package, providing easy mounting capability for external heatsinks. A monitor circuit
makes sure a compliance voltage is present, before biasing the DTL5A-LC's output
stage. A Fault line goes active, should the device-under-test go below its compliance
voltage.
These loads feature fast current step response times, settling a full scale step in 100
µsec to ±1% Full Scale Range (FSR). Dynamic loading is up to 20kHz, and a current
resolution of ±0.025% is achieved. Opto-isolators are utilized on the digital input lines,
with 500 Volts of isolation provided from the load outputs to input ground. The optoisolators are internally buffered, making the DTL5A-LC easy to drive, with any digital I/O
board. Isolation from any pin to case is 500 Volts.
· Real-time load simulation
+5V
Supply Ground
3
2
Isolated
DC/DC
Converter
11
7
Control Strobe (CS)
Clock (CLK)
Serial Data In (SDI)
Latch Data (LD)
10
6
5
Buffers/ 4
Opto
Isolators
Power Supply
Under Test
9
4
1
+Load Input
Amplifier/
Current
Sensor
D/A
Converter
8
Fault
+Load Input
–Load Input
–Load Input
Error
Detection
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • Email: [email protected] • Internet: www.datel.com
100 Watt
DTL5A-LC
Performance Specifications and Ordering Guide
Serial-Input
Electronic
Loads
➀
Output
Model
Compliance
Voltage
(Volts)
DTL5A-LC
0.6 to 50
Loading Curent
(Amperes)
Current Resolution
mA
0 to 2.0
0.5
Accuracy
(%FSR)
Offset Error
(%FSR)
±3
±0.05
Gain Error
(mA)
Gain Error
(% of Setting)
Package
(Case
Pinout)
±0.25
C1
50
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions unless otherwise noted.
Mechanical Specifications
Case C1
Part Number Structure
DTL
A - LC
5
Prefix:
DTL = DATEL product
#4-40 CLEAR THRU
(TYP 4 PL )
A-Series
High Reliability
Voltage Range/Current:
5 = 2.5 to 50V, 0 to 2A
Metal Shell
LC = Low Compliance:
Voltage Range of 0.6 to 50V
DTL5A-LC model only
Aluminum Header
.±0.001
Pins
±0.20 Min
±0.001
Pins
The warranty period is one year
2.02 Max.
A
1.800
B
A
± .0 1 0
1.640
Temperature Derating
7
8
60
Load
Capacity
in Watts
40
1.640
4
3
1 0
2
1
1 1
.200
80
9
.220
100
5
1.200
1.000
.800
.600
.400
2.02 Max.
6
7
B
8
6
5
20
0
10
20 25 30
40
50
60
70
80
90
100
9
4
BOTTOM VIEW
3
(Label/pin side)
10
2
Base Plate Temperature in °C
1
11
I/O Connections
Note:
The DTL5A-LC electronic load packaging has been designed to allow for use
with external heatsinking for high wattage applications. The DTL5A-LC can
dissipate up to 100 Watts with external cooling (heatsink or fan) observing the
base plate temperature requirements above. The loads are capable of
dissipating 5 Watts at room temperature without any external cooling.
The devices can also be connected in parallel for additional loading capability.
2
Pin
Function
Pin
Function
1
Fault
8
- Load Input
2
Ground
9
- Load Input
3
+5 Volts Supply
10
+ Load Input
4
Latch Data (LD)
11
+ Load Input
5
Serial Data In (SDI)
6
Clock (CLK)
7
Control Strobe (CS)
± .0 1 0
DTL5A-LC
100 Watt Serial-Input Electronic Loads
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted.
Input
Digital Inputs (pins 4, 5, 6, 7):
VIL
VIH
IIL
Min.
Typ.
Timing
Max.
Units
0.8
CLK
-0.6
Volts
Volts
mA
20
µA
t
Min.
Typ.
Max.
Units
200
kHz
Refer to timing diagram:
2.0
IIH
t =t
cl
1
µsec
1
µsec
1
µsec
2
µsec
2
µsec
2
µsec
0.5
µsec
0.5
µsec
ch
css
t
Output
csh
Loading Current
t
See Ordering Guide
Current Resolution
±0.025
ld1
% FSR
t
t
Offset Error
±0.05
% FSR
Gain Error
DTL5A-LC
±0.3
% FSR
ld2
ldw
t
ds
t
dh
Compliance Voltage Range
Output Impedance
See Ordering Guide
10
Mohm
Absolute Maximum Ratings
Dynamic Characteristics
Dynamic Loading to:
20
kHz
Settling Time
(Full Scale Step)
100
usec
Slew Rate
10
A/µsec
These are stress ratings. Exposure of devices to any of these conditions may
adversely affect long-term reliability. Proper operation under conditions other
than those listed in the Performance/Functional Specifications Table is not
implied.
Power
+5 Volts Supply (pin 3)
+4.75
Current (pin 3)
+5.0
+5.25
Volts
+110
+150
mA
Power Supply Voltage (pin3):
5.5 Volts
Digital Input Voltage (pins 4,5,6,7):
5.5 Volts
Output Reverse-Polarity Protection:
No protection
Output Overvoltage Protection:
No protection
Storage Temperature
–40 to +105°C
Lead Temperature (soldering, 10 sec.)
+300°C
Environmental
Operating Ambient Temperature Ta, where no derating required. Natural
Convection, vertical mount
Storage Temperature
–40
+105
Humidity
(Non-condensing)
95
Altitude Above Sea Level
10,000
°C
%
feet
Physical
Dimensions
2" x 2" x 0.52" (51 x 51 x 12.7mm)
Pin Length
0.2
inches
Shielding
Case Material
6-sided
Tin-plated Steel Shell
Heat-sink side: Aluminum
Pin Material
Brass, solder coated
Isolation, ± Load to
Input Ground
500
Volts
Isolation, any pin to case
500
Volts
Isolation, resistance
100
Mohm
Mounting
Through-hole spacer,
#4-40 clearance
Weight
1.9 ounces (55 grams)
3
DTL5A-LC
100 Watt
Serial-Input
Electronic
Loads
Overview
Software:
C Language
The DTL5A-LC is a serial-input controlled current sink. Powered by a single +5V
power supply, the DTL5A-LC provides a compliance voltage range from 0.6
Volts to 50 Volts, with loading currents to 2.0 Amperes. Refer to the Table of
the basic "Mapping of the Serial-Input Data Word to the Loading Current for the
devices transfer function. Utilizing external heatsinking, the device handles
loads to 100 watts with a base-plate temperature of 25°C, derating thereafter
(only 5 Watts without external heatsink/cooling. Refer to the "Temperature
Derating" curve figure herein that illustrates the load capacity in Watts, as a
function of the base plate temperature.
The following steps describe a typical timing sequence when
using four lines of a parallel digital I/O port and a programming
language such as C. Using 4 bits of an 8-bit port, assign BIT_0
(LSB) to the Control Strobe (CS, pin 7), BIT_1 to
Latch Data (LD, pin 4), BIT_2 to Serial Data In (SDI, pin 5) and
BIT_3 to the Clock (CLK, pin 6).
1. Initialize with Latch Data, Clock, and Control Strobe HIGH.
BIT_0 = 1, BIT_1 = 1, BIT_2 = X (don’t care), BIT _3 = 1
2. Place the Control Strobe LOW.
The Device Under Test (DUT) outputs are hooked up to the +Load Input (pins
10 & 11) and the - Load Input (pins 8 & 9). An input serial data stream (Pin 5)
and clock (Pin 6) are opto-isolated internally. These isolated inputs are gated
through to a 12-bit serial input D/A, where the input word can be latched using
the Latch Data input (Pin 4). A Fault ouput pin (Pin 1) indicates excessive heat
or operation outside the compliance range.
BIT_0 = 0
3. Place D11 (MSB) of the Data Word into Serial Data In.
BIT_2 = 0 or 1
4. Toggle the Clock HIGH-LOW-HIGH
BIT_3 =1-to-0-to-1
Operation Overview
5. Place D10 of the Data Word into Serial Data In.
BIT_2 = 0 or 1
Programming is easily accomplished by utilizing four lines of a parallel digital I/O
port. The four digital outputs will be used to control the Control Strobe (CS,
pin7), the Latch Data (LD, pin 4), the Serial Data In (SDI, pin 5) and the Clock
(CLK, pin 6) functions of the DTL5A-LC Series.
6. Toggle the Clock High-LOW-HIGH.
BIT_3 = 1-to-0-to-1
Initialization
7. REPEAT this process (steps 5 and 6) for the remaining data
bits (D9-D0).
Initialization of the device is accomplished by first setting the Control Strobe,
Clock and Latch Data pins to a Logic High ("1") state. The Serial Data In state
at this time is "Don’t Care". Next, bring the Control Strobe pin to a Logic Low
("0") state. The load is now prepared to accept a serial input word.
8. Set the Control Strobe High.
Bit_0 = 1
9. Toggle the Latch Data High-LOW-HIGH
BIT_1 = 1-to-0-to-1
Input of Serial Data
After initialization, a serial-input data word representing the desired load current
is input to the load. This is accomplished with a data stream that begins with
the Most Significant Bit (MSB). With the MSB present on the Serial Data In
(pin 5), toggle the Clock (pin 6) through a High-Low-High state sequence.
Similarly, proceed from the MSB to the LSB bits, toggling the Clock (pin 6)
through a High-Low-High state for each bit. The timing specifications shown in
the "Timing Diagram" should be observed in transitioning the clock states.
Serial-Input Data Word
MSB
Latching the Data Word
Upon entering the final, Least Significant Bit (LSB), the serial-input data word is
latched, by bringing the Control Strobe (pin 7) high and then toggling the Latch
Data (pin 4) through a High-Low-High state sequence.
LSB
Load Current (Amperes)
DTL5A-LC
1111
1111
1111
1.9995
1100
0000
0000
1.5000
1000
0000
0000
1.000
0111
1111
1111
0.9995
0100
0000
0000
0.5000
0010
0000
0000
0.2500
0000
0000
0001
0.0005
0000
000
0000
0.000
Mapping of the Serial-Input Data Word to Load Current
4
100 Watt
Serial-Input
Electronic
DTL5A-LC
Loads
tdh
SDI
D10
D 11
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
tds
CLK
tcss
tcl
tcsh
tch
CS
tld2
tld1
LD
tldw
Timing Diagram
Load Regulation
5
DTL5A-LC
1 0 0 Wa t t
Serial-Input
Quality and Reliability
The DTL5A-LC is one of the first Electronic Loads to emerge from DATEL’s
new, company-wide approach to designing and manufacturing the most reliable
power products available. The five-pronged program draws our Quality
Assurance function into all aspects of new-product design, development,
characterization, qualification and manufacturing.
Design for Reliability
Design for Reliability is woven throughout our multi-phased, new-productdevelopment process. Design-for-reliability practices are fully documented
and begin early in the new-product development cycle with the following
goals:
1. To work from an approved components/vendors list ensuring the use of
reliable components and the rigorous qualification of new components.
2. To design with safety margins by adhering to a strict set of derating
guidelines and performing theoretical worst-case analyses.
3. To locate potential design weaknesses early in the product-development
cycle by using extensive HALT (Highly Accelerated Life Testing).
4. To prove that early design improvements are effective by employing a
thorough FRACA (Failure Reporting Analysis and Corrective Action) system.
Electronic
Load
stepped up again and the cycle is repeated until the "fundamental limit of the
technology" is determined.
DATEL has invested in a Qualmark OVS-1 HALT tester capable of applying
voltage and temperature extremes as well as 6-axis, linear and rotational,
random vibration. A typical HALT profile (shown above) consists of thermal
cycling (–55 to +125°C, 30°C/minute) and simultaneous, gradually
increasing, random longitudinal and rotational vibration up to 20G’s with load
cycling and applied-voltage extremes added as desired. Many devices in
DATEL’s new A-Series could not be made to fail prior to reaching either the
limits of the HALT chamber or some previously known physical limit of the
device. We also use the HALT chamber and its ability to rapidly cool devices
to verify their "cold-start" capabilities.
Qualification
For each new product, electrical performance is verified via a comprehensive
characterization process and long-term reliability is confirmed via a rigorous
qualification procedure. The qual procedure includes such strenuous tests
as thermal shock and 500 hour life. Qual testing is summarized below.
Qualification Testing
HALT Testing
Qualification Test
Method/Comments
The goal of the accelerated-stress techniques used by DATEL is to force
device maturity, in a short period of time, by exposing devices to excessive
levels of "every stimulus of potential value." We use HALT (Highly Accelerated Life Testing) repeatedly during the design and early manufacturing
phases to detect potential electrical and mechanical design weaknesses
that could result in possible future field failures.
HALT
DATEL in-house procedure
During HALT, prototype and pre-production electronic loads are subjected to
progressively higher stress levels induced by thermal cycling, rate of temperature change, vibration, power cycling, product-specific stresses (such as dc
voltage variation) and combined environments. The stresses are not meant to
simulate field environments but to expose any weaknesses in a product’s
electro/mechanical design and/or assembly processes. The goal of HALT is to
make products fail so that device weaknesses can be analyzed and strengthened as appropriate. Applied stresses are continually stepped up until products
eventually fail. After corrective actions and/or design changes, stresses are
Marking Permanency
DATEL in-house procedure
End Point Electrical Tests
Per product specification
Typical HALT Profile
High Temperature Storage
Max. rated temp., 1,000 hours
Thermal Shock
10 cycles, –55 to +125°C
Temperature/Humidity
+85°C, 85% humidity, 48 hours
Lead Integrity
DATEL in-house procedure
Life Test
+70°C, 500 hours*
* Interim electrical test at 200 hours.
In-Line Process Controls and Screening
A combination of statistical sampling and 100% inspection techniques keeps
our assembly line under constant control. Parameters such as solder-paste
thickness, component placement, cleanliness, etc. are statistically sampled,
charted and fine tuned as necessary. Visual inspections are performed by
trained operators after pick-and-place, soldering and cleaning operations.
Units are 100% electrically tested prior to potting. All devices are temperature cycled, burned-in, hi-pot tested and final-electrical tested prior to external
visual examination, packing and shipping.
Rapid Response to Problems
DATEL employs an outstanding corrective-action system to immediately
address any detected shortcomings in either products or processes.
Whenever our assembly, quality or engineering personnel spot a product/
process problem, or if a product is returned with a potential defect, we
immediately perform a detailed failure analysis and, if necessary, undertake
corrective actions. Over time, this system has helped refine our assembly
operation to yield one of the lowest product defect rates in the industry.
Test Time (minutes)
®
®
ISO 9001
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Murata
Power339-3000
Solutions, Inc.(800) 233-2765 Fax: (508) 339-6356
Tel: (508)
www.datel.com
[email protected]
11Internet:
Cabot Boulevard,
Mansfield, MAEmail:
02048-1151
U.S.A.
FaxREGISTERED
Back: (508) 261-2857
ISOData
9001 Sheet
and 14001
www.murata-ps.com/support
DATEL
DATEL
DATEL
DATEL
(UK) LTD. Tadley, England Tel: (01256)-880444
This product is subject to the following operating requirements
S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
and München,
the Life and
Safety Critical
Application Sales Policy:
GmbH
Germany
Tel: 89-544334-0
Refer
to:
http://www.murata-ps.com/requirements/
KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2012 Murata Power Solutions, Inc.