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NEW
(R)
(R)
INNOVATION and EXCELLENCE
DTL Series
DTL3A Model
Digitally Programmable, 2A/200V 100 Watt, Electronic Loads
Features
12-bit, optically isolated (500Vdc), CMOS/TTL-compatible serial input 0-2 Amp output in 500A increments Output voltage to 200 Volts Output power to 100 Watts 10M minimum output impedance 500A offset error; 0.1% gain error 100sec full-scale step response Update rates to 20kHz Operate in parallel for higher power Miniature, 2" x 2" metal package

Applications

Static/dynamic power-supply burn-in Power-supply test and characterization Battery capacity testing Current-source testing Capacitor discharge testing Real-time load simulation
DATEL's new DTL3A is a digitally controlled, optically isolated, serial-input electronic load that offers high compliance voltage and unprecedented control over lowlevel currents. The DTL3A is essentially a computer controlled current source that sinks currents from 0 to 2 Amps, at loading voltages from 2.5 to 200 Volts, up to a maximum power of 100 Watts. The DTL3A accepts a serialized, 12-bit, CMOS/TTL digital input word, optically isolates (500Vdc) the data, latches it, and presents it to an on-board, 12-bit, digital-to-analog (D/A) converter. The D/A output drives a near-ideal (10M output impedance), voltage-controlled current source. One LSB (least signi cant bit) of the D/A corresponds to a mere 500A (0.025% of 2A) of load current. Combined with the DTL3A's 500A max. offset error and 0.1% max. gain error, this precise digital control gives users extraordinary command over the generation of low-level load currents. A 100mA current, for example, is guaranteed to have 1mA accuracy over all speci ed load-voltage conditions. The DTL3A has impressive speed performance. Digital update rates to 20kHz are possible, and settling time for a full 2A step is 100sec. The unit is housed in a thermally ef cient, 2" x 2" x 0.5" metal package that has an aluminum baseplate with through-hole spacers for easy pcb mounting and/or external heat-sink attachment. The DTL-3A has an output compliance-voltage requirement 2.5 to 200V. Should the output/load voltage drop below the 2.5V minimum required for proper biasing, an internal monitoring circuit activates the DTL3A's output Fault line. See DATEL's DTL2A-LC for compliance voltages as low as 0.6V. DATEL's electronic loads, controller boards and companion software are outstanding building-block components for power-supply (AC/DC and DC/DC) and powercomponent (diodes, FET's, etc.) burn-in and test systems. They are an extremely reliable, cost-effective solution that enables you to quickly con gure exible, impressively accurate systems.
INPUT BUFFERS CONTROL STROBE (CS)
OPTO ISOLATORS
+LOAD CLOCK (CLK) DATA LATCH 12-BIT D/A AMPLIFIER AND CURRENT SENSOR -LOAD LATCH DATA (LD) -LOAD +LOAD POWER DEVICE UNDER TEST
SERIAL DATA INPUT (SDI)
+5V SUPPLY GROUND
ISOLATED DC/DC CONVERTER
UNDERVOLTAGE DETECTION
FAULT
Figure 1. Simplified Schematic
DATEL, Inc., Mans eld, MA 02048 (USA) * Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 * Email: sales@datel.com * Internet: www.datel.com
DTL Series
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Performance Specifications and Ordering Guide
Input
Resolution (Bits) 12 Logic Compatibility CMOS/TTL
Output
Model DTL3A
Current (Amps) 0-2
Resolution (mA) 0.5
Compliance Voltage (Volts) 2.5-200
Power (Watts) 0-100
Package (Case, Pinout) C24, P31
Typical at TA = +25C with nominal +5V supply voltage unless noted. The smallest increment/decrement in output current is defined by one LSB (least significant bit) of the 12-bit digital input word. One LSB is equal to full scale (FS) divided by 4096 which corresponds to 0.0244% of 2A or 488A. For proper operation, the unit's output/load voltage must remain within this range. Voltages greater than the listed maximum can damage the device. Voltages less than the minimum provide insufficient bias for the output stage and will result in unpredictable or no operation. See Output Compliance Voltage and the Fault Line for details. See Performance/Functional Specifications for details.
PA R T N U M B E R S T R U C T U R E
M E C H A N I C A L S P E C I F I C AT I O N S
DTL
DATEL Electronic Load
3A
A-Series High Reliability
0.50 (12.70)
2.00 (50.80)
ALUMINUM BASEPLATE
METAL CASE
Case C24
Voltage Range: 3 = 2.5 to 200V
0.20 MIN (5.08)
0.040 0.002 DIA. (1.016 0.051)
1.800 (45.72) 1.640 (41.66)
0.060 0.002 DIA. (1.524 0.051) 0.10 (2.54) 0.08 (2.03)
T E M P E R AT U R E D E R AT I N
7
100 90 80
8
6
1.20 (30.48) 6 EQ. SP. @ 0.200 (5.08)
5 4 3 2 1
9
2.00 1.640 (41.66) (50.80)
Output Power/Load (Watts)
10
70 60 50 40 30 20
11
0.40 (10.16) BOTTOM VIEW #4-40 CLEAR THRU (TYP. 4 PL) 0.22 (5.59)
I/O Connections
Pin Function P31 Fault Ground +5 Volt Supply Latch Data (LD) Serial Data In (SDI) Clock (CLK) Pin 7 8 9 10 11 Function P31 Control Strobe (CS) -Load -Load +Load +Load 1 2
0 10 20 30 40 50 60 70 80 90 100
10
Baseplate Temperature (C)
3 4 5
The horizontal axis of the above chart references the temperature of the DTL3A's aluminum baseplate. The device can continually dissipate up to 100 Watts if the baseplate is maintained at or below +50C. At +25C ambient temperature, with no heat sink or supplemental air flow, the DTL3A can reliably dissipate a continuous 10 Watts.
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Contact DATEL for Heat Sink information.
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DTL3A Model
Performance/Functional Specifications
Typical @ TA = +25C with nominal +5V supply voltage, unless noted.
Digital Inputs/Outputs
Logic Compatibility (Pins 1, 4-7) Input Logic Levels: Logic "1" Logic "0" Input Logic Loading: Logic "1" (IIH @ VIH = 5 Volts) Logic "0" (IIL @ VIL = 0 Volts) Output Logic Levels: Logic "1" (@ 150A) Logic "0" (@ 1.6mA) Timing Current: Range Resolution Accuracy Voltage Range Power Range Impedance Offset Error Gain Error Isolation Voltage: Digital Inputs/Output to Load Any Pin to Case Isolation Resistance Output Slew Rate Output Settling Time Digital Input Update Rate Power Supply Range (+VCC, Pin 3) Power Supply Current Operating Temperature Storage Temperature Humidity (Non-condensing) Altitude Above Sea Level Dimensions Shielding Case Material Pin Material Mounting Holes Weight CMOS/TTL +2 Volts, minimum +0.8 Volts, maximum 20A, maximum -0.6mA, maximum +3.5 Volts, minimum +0.4 Volts, maximum See Timing Diagram
The smallest increment/decrement in output current is defined by one LSB (least significant bit) of the 12-bit digital input word. One LSB is equal to full scale (FS) divided by 4096 which corresponds to 0.0244% of 2A or 488A. For proper operation, the unit's output/load voltage must remain within this range. Voltages greater than the listed maximum can damage the device. Voltages less than the minimum provide insufficient bias for the output stage and will result in unpredictable or no operation. See Output Compliance Voltage and the Fault Line for details. Offset error is defined as the current sunk/sourced by the DTL3A's output, under any output voltage conditions, when the digital input word is all "0's." Full scale step (2 Amps) settling to within 0.5mA of its final value. See Temperature Derating. Applies over all specified ranges/combinations of load voltage/current, operating temperature, and VCC.
Absolute Maximum Ratings
Power Supply Voltage (+VCC, Pin 3) Digital Input Voltage (Pins 4-7) -0.5 to +5.5 Volts -0.5 to +5.5 Volts No protection No protection Yes (See Fault Line) +105C -40 to +125C +300C
Output
0-2 Amps 0.024%FS (488A) 1%, maximum 2.5-200 Volts 0-100 Watts 10M, minimum 0.5mA, maximum 0.1%, maximum 500Vdc, minimum 500Vdc, minimum 100M, minimum
Output Reverse-Polarity Protection Output Overvoltage Protection Output Undervoltage Protection Case Temperature Storage Temperature (Ambient) Lead Temperature (Soldering, 10 sec.)
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.
Dynamic Performance
10A/sec, minimum 100sec to 20kHz
TECHNICAL NOTES
Overview The DTL3A is a digitally programmable, CMOS/TTL-compatible, serial-input current sink. It's output/load current range is 0 to 2 Amps (in 488A increments), over a compliance voltage range of 2.5 to 200 Volts and an output/ load power range of 0 to 100 Watts. The device's digital I/O coding is straight binary (see table below). A digital input of all "0's" forces a load current of 0 Amps. A digital input of all "1's" forces a load current of 1.9995 Amps. In a typical power-supply test or burn-in application, the output pins of the device under test (DUT) are connected to the DTL3A's +Load (pins 10 and 11) and -Load (pins 8 and 9) outputs. The DTL3A's operation is controlled by its four digital input lines (Serial Data In, Clock, Latch Data and Control Strobe).
Serial Input Data Word
MSB 1111 1100 1000 0111 0100 0010 0000 0000 1111 0000 0000 1111 0000 0000 0000 0000 LSB 1111 0000 0000 1111 0000 0000 0001 0000
Power Requirements
+4.75-5.25 Volts (+5V nominal) 110mA typ., 150mA max.
Environmental
-40 to +100C (Case) -40 to +125C (Ambient) to 95% 10,000 feet
Physical
2" x 2" x 0.5" (51 x 51 x 12.7mm) 6-sided (Connected to pin 2) Tin-plated steel shell with aluminum baseplate Brass, solder coated Through-hole spacers, #4-40 clearance 1.9 ounces (54 grams)
Load Current (Amps)
DTL3A 1.9995 1.5000 1.0000 0.9995 0.5000 0.2500 0.0005 0.0000
Mapping of the Serial-Input Data to Load Current
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DTL Series
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Initialization Preparing the DTL3A to accept new digital data is accomplished by applying logic "1's" to Control Strobe (CS, pin 7), Latch Data (LD, pin 4) and Clock (CLK, pin 6) with all signals present and stable for a minimum of 1sec. During this interval, it does not matter whether or not data is present on the Serial Data In (SDI, pin 5) line. Serial Data Following initialization, the 12-bit digital word representing the desired output current is applied to the SDI pin. The serial data should appear starting with the most significant bit (MSB, bit 1, D11) and ending with the least significant bit (LSB, bit 12, D0). With each data bit present and stable on the SDI line, the CLK must be toggled through a low-to-high transition to register that bit. Twelve rising clock edges, at rates up to 500kHz, are required to clock all 12 digital bits into the DTL3A's input register. Latching Data and Presenting It to the D/A After loading the LSB, the serial data word is latched by bringing the Control Strobe (pin 7) high and then toggling the Latch Data pin (pin 4) through a high-low-high sequence. Approximately 100sec later, the output current will settle to its final desired value. Software: C Language The following steps describe a typical timing sequence when using the DTL3A's 4 digital inputs and a programming language such as C. Using 4 bits of a typical 8-bit port, assign BIT_0 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 Control Strobe, Latch Data, and Clock high: BIT_0 = 1, BIT_1 = 1, BIT_2 = X (don't care), BIT_3 = 1 2. Bring the Control Strobe low. BIT_0 = 0 3. Apply the MSB (D11) of the serial data word to Serial Data In. BIT_2 = 0 or 1 4. Toggle the Clock high-low-high. BIT_3 = 1 to 0 to 1 5. Apply D10 of the serial data word to Serial Data In. BIT_2 = 0 or 1 6. Toggle the Clock high-low-high. BIT_3 = 1 to 0 to 1 7. Repeat the process for remaining data bits D9 through D0. 8. Drive the Control Strobe high. BIT_0 = 1 9. Toggle the Latch Data input high-low-high. BIT_1 = 1 to 0 to 1.
Output Compliance Voltage and the Fault Line For proper operation, the DTL3A's output/load voltage must always be between 2.5 and 200 Volts. The device cannot be used to directly load lowvoltage, e.g. 1.8V or 2.5V, power components or to simulate a true short circuit (0 Volts). Voltages greater than 200V can damage the device. Voltages <2.5V will result in insufficient biasing of the output current source and consequently unpredictable or no operation. Accordingly, we have installed an internal output/load-voltage monitoring circuit. If the output/load voltage drops below 2.5V and the DTL3A's output is at risk of becoming disabled, the Fault line activates. The Fault line is an optically isolated, active-low function with an opencollector output (internal 10k pull-up resistor to +5V). Under normal conditions, its output is high (logic "1"). Under fault conditions (VOUT < 2.5V), its output drops to a logic "0." There is no output/load-voltage monitoring circuit for voltages greater than 200V, and operation above 200V can damage the device. An "offset supply" can be inserted between the DTL3A's -Load output (pins 8 and 9) and the power device under test (DUT) to "translate" the DTL3A's 197.5V output/load voltage range. The offset supply must have adequate current capabilities and be connected with the polarities indicated in Figure 2 below. Under no circumstances should the voltage across the DTL3A's output be allowed to experience a polarity reversal. If a 5V/20A offset supply is inserted as shown, the range of DUT voltages will be -2.5 to +195 Volts. Such a configuration can be used for true shortcircuit testing. A mechanical relay can be used to short the outputs of the DUT while the offset supply ensures the DTL3A always sees at least 5 Volts across its outputs.
+LOAD
11 10 + DUT 5V 9 + - SHORT CIRCUIT RELAY
DTL3A
-LOAD 8
-
Figure 2. An "Offset Supply" Enables True Short-Circuit Testing
Thermal Considerations The DTL3A can reliably handle 100W loads if its case temperature is maintained at or below +50C. With no heat sinking or auxiliary cooling, the device can only handle loads up to 10 Watts. Please refer to the Temperature Derating Curve for additional information. DATEL's Electronic Load Applications Engineers can assist you in developing heat-sink solutions for your higher-power DTL3A applications. Please contact us for details.
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DTL3A Model
tdh
SDI
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
tds tin
CLK
tcss
tcl tch
tcsh
CS
tld1
LD
tld2
tldw
Timing
CLK
Min.
- 1 1 1 1 2 2 2 0.5 0.5
Typ.
- - - - - - - - - -
Max.
200 - - - - - - - - -
Units
Hz sec sec sec sec sec sec sec sec sec
tin tcl = tch tcss tcsh tld1 tld2 tldw tds tdh
Figure 3. DTL3A Timing Diagram
(R)
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INNOVATION and EXCELLENCE
ISO 9001 REGISTERED
DS-0477
9/00
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com Email: sales@datel.com
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025
DATEL 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. The DATEL logo is a registered DATEL, Inc. trademark.
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