SPDPXXD28-1 [SENSITRON]

Programmable DC Solid State Power Controller Module; 可编程直流固态功率控制器模块
SPDPXXD28-1
型号: SPDPXXD28-1
厂家: SENSITRON    SENSITRON
描述:

Programmable DC Solid State Power Controller Module
可编程直流固态功率控制器模块

功率控制 控制器
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Programmable DC Solid State Power Controller Module  
Description:  
These Solid State Power Controller (SSPC) Modules are designed to operate without any heatsink  
requirements. They are microcontroller-based Solid State Relays rated up to 30A designed to be used in high  
reliability 28V DC applications. These modules have integrated current sensing with no derating over the full  
operating temperature range. These modules are the electronic equivalent to electromechanical circuit  
breakers with isolated control and status. This series is supplied in 6 SSPC families, with each family being  
programmable over a 5:1 current range.  
SPDP05D28-1: Programmable from 1A to 5A  
SPDP10D28-1: Programmable from 2A to 10A  
SPDP15D28-1: Programmable from 3A to 15A  
SPDP20D28-1: Programmable from 4A to 20A  
SPDP25D28-1: Programmable from 5A to 25A  
SPDP30D28-1: Programmable from 6A to 30A  
Compliant Documents & Standards:  
MIL-STD-1275B, Notice1  
MIL-STD-704F  
Characteristics of 28 Volt DC Electrical Systems in Military Vehicles-4/20/04  
Aircraft Electrical Power Characteristics 12 March 2004  
MIL-STD-217F, Notice 2  
Reliability Prediction of Electronic Equipment 28 Feb 1995  
Module Features:  
No additional heat sinking or external cooling required!  
Extremely Low Power, No Derating Over the Full Temperature Range  
Low Weight (30 grams)  
Same Pin Out as Industry Standard SSPCs in a Smaller Outline  
Epoxy Shell Construction  
Solid State Reliability  
High Power Density  
Electrical Features (SPDPXXD28-1 Series):  
28VDC Input with Very Low Voltage Drop; 45mV, typ. @15A for SPDP25D28-1  
True I2t Protection up to 10X rating with Nuisance Trip Suppression  
Instant Trip Protection (100 μsec typ) for Loads Above 10X rating  
Unlimited Interrupt Capability; Repetitive Fault Handling Capability  
Thermal Memory  
Internally Generated Isolated Supply to Drive the Switch  
Low Bias Supply Current: 60 mA typ @ 5V DC  
High Control Circuit Isolation: 750V DC Control to Power Circuit  
Soft Turn-On to Reduce EMC Issues  
EMI Tolerant  
Module Reset with a Low Level Signal; Reset Circuit is Trip-Free  
TTL/CMOS Compatible, Digitally Isolated, Input and Outputs  
Input filter for Noise Immunity  
©2010 Sensitron Semiconductor 221 West Industry Court Deer Park, NY 11729-4681  
Phone (631) 586 7600 Fax (631) 242 9798 www.sensitron.com sales@sensitron.com Page 1  
SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Table 1 - Electrical Characteristics (at 25 oC and Vbias = 5.0V DC unless otherwise specified)  
Control & Status (TTL/CMOS Compatible)  
5.0V DC Nominal, 6.5V DC Absolute Maximum  
4.5V to 5.5 VDC  
BIAS (Vcc)  
60 mA typ  
BIAS (Vcc) Current  
85 mA, max  
Voh=4.6V min, at Ioh=-4mA  
GATE Status, Load Status Signals  
Vol=0.4V max, at Iol=4mA  
VIh=2.0V min  
CONTROL Signal  
Trip Reset  
VIl=0.8V max  
Cycle CONTROL Signal  
Power  
Input Voltage – Continuous  
0 to 40V DC, 55V DC Absolute Maximum  
+600V or –600V Spike (< 10 µs)  
See Table 5  
– Transient  
Power Dissipation  
See Table 5  
See Figure 1, Trip Curve  
Current  
Max Voltage Drop  
See Table 5  
Max current without tripping  
110% min  
Trip time  
See Figure 1, Trip Curve  
200 μsec typ  
200 μsec typ  
50 μsec typ  
Output Rise Time (turn ON)  
Output Fall Time under normal turn-off  
Output Fall Time under Fault  
Min Load Requirement  
Nil  
Protection  
Short Circuit Protection  
Unlimited  
Instant Trip  
800%, min; 1200%, max  
Table 2 - Physical Characteristics  
Temperature  
Operating Temperature  
Storage Temperature  
TA = -55 °C to +100 °C  
TA = -55 °C to +125 °C  
Environmental  
Up to 30,000 ft  
Can be installed in an unpressurized area  
Altitude  
Case Dimensions  
Operating Orientation  
Weight  
1.875 L X 1.125 W X 0.550 H  
Any  
40 grams max  
44 Khrs  
MTBF (Estimate: MIL STD 217F)  
@ 700C ambient, Full load, Ground Mobile  
©2010 Sensitron Semiconductor 221 West Industry Court Deer Park, NY 11729-4681  
Phone (631) 586 7600 Fax (631) 242 9798 www.sensitron.com sales@sensitron.com Page 2  
SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Figure 1 - Trip Curve  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Figure 2 - Timing Diagram  
Table 3 - Signal Timing – (-55 oC to 100 oC @ LINE = 28V DC)  
Parameter  
Symbol  
Min (μs) Max (μs)  
CONTROL to GATE Status Delay for Turn On  
Turn ON Delay  
Load Current Rise Time  
Turn ON to LOAD Status Delay  
CONTROL to GATE Status Delay for Turn Off  
Turn OFF Delay  
t0  
t1  
t2  
t3  
t4  
t5  
t6  
t7  
100  
150  
100  
300  
100  
200  
150  
150  
250  
350  
300  
500  
300  
500  
300  
350  
Load Current Fall Time  
Turn OFF to LOAD Delay  
Note: Current Fall Time from trip dependent on magnitude of overload  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Figure 3 - Mechanical Dimensions  
All dimensions are in inches  
Table 4 - Pin Definitions  
Pin Number Pin Name  
Function  
1
2
BIAS  
GND  
+5V DC Supply  
5V Return  
3
4
5
6
GATE Status  
LOAD Status  
CONTROL Input  
LINE  
Switch Status  
Load Current Detection  
On/Off Control  
+28V DC Supply  
7
8
9
GAINRET  
PWRGND  
GAIN  
Internally connected to LOAD (pin 10)  
28V Return  
Gain Adjust  
10  
LOAD  
Load Connection  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Table 5 – Individual Model Ratings  
SPDP05D28-1  
SPDP05D28-1 Set for  
SPDP05D28-1 Set for  
SPDP05D28-1 Set for  
5 Amp Rating  
1.0 Amp Rating  
1.0A  
2.5 Amp Rating  
2.5A  
Current Rating @ 100OC  
5A  
0.26W typ @ 0.6A 25OC  
0.27W max @ 1A 25OC  
0.28W typ @ 1.5A 25OC  
0.34W max @ 2.5A 25OC  
0.38W typ @ 3A 25OC  
0.61W max @ 5A 25OC  
0.67W max @ 5A 100OC  
44mV typ @ 3A 25OC  
73mV max @ 5A 25OC  
83mV max @ 5A 100OC  
Power Dissipation  
(including Control Power)  
0.27W max @ 1A 100OC 0.35W max @ 2.5A 100OC  
9mV typ @ 0.6A 25OC  
15mV max @ 1A 25OC  
17mV max @ 1A 100OC  
22mV typ @ 1.5A 25OC  
36mV max @ 2.5A 25OC  
42mV max @ 2.5A 100OC  
Max Voltage Drop  
SPDP10D28-1  
SPDP10D28-1 Set for SPDP10D28-1 Set for  
SPDP10D28-1 Set for  
10 Amp Rating  
2.0 Amp Rating  
2.0A  
5 Amp Rating  
5A  
Current Rating @ 100OC  
10A  
0.26 W typ @ 1.2A 25OC  
0.29W max @ 2A 25OC  
0.30W max @ 2A 100OC  
11mV typ @ 1.2A 25OC  
19mV max @ 2A 25OC  
23mV max @ 2A 100OC  
0.34W typ @ 3A 25OC  
0.49W max @ 5A 25OC  
0.54W max @ 5A 100OC  
29mV typ @ 3A 25OC  
48mV max @ 5A 25OC  
58mV max @ 5A 100OC  
0.59W typ @ 6A 25OC  
1.20W max @ 10A 25OC  
1.42W max @ 10A 100OC  
57mV typ @ 6A 25OC  
95mV max @ 10A 25OC  
117mV max @ 10A 100OC  
Power Dissipation  
(including Control Power)  
Max Voltage Drop  
SPDP15D28-1  
SPDP15D28-1 Set for SPDP15D28-1 Set for  
SPDP15D28-1 Set for  
15 Amp Rating  
15A  
3.0 Amp Rating  
3.0A  
7.5 Amp Rating  
7.5A  
Current Rating @ 100OC  
0.27W typ @ 1.8A 25OC  
0.32W max @ 3A 25OC  
0.40W typ @ 4.5A 25OC  
0.67W max @ 7.5A 25OC  
0.86W typ @ 9A 25OC  
1.94W max @ 15A 25OC  
Power Dissipation  
(including Control Power)  
0.34W max @ 3A 100OC 0.79W max @ 7.5A 100OC 2.43W max @ 15A 100OC  
14mV typ @ 1.8A 25OC  
23mV max @ 3A 25OC  
29mV max @ 3A 100OC  
34mV typ @ 4.5A 25OC  
56mV max @ 7.5A 25OC  
68mV typ @ 9A 25OC  
Max Voltage Drop  
113mV max @ 15A 25OC  
73mV max @ 7.5A 100OC 145mV max @ 15A 100OC  
SPDP20D28-1  
SPDP20D28-1 Set for SPDP20D28-1 Set for  
SPDP20D28-1 Set for  
20 Amp Rating  
20A  
4.0 Amp Rating  
4.0A  
10 Amp Rating  
10A  
Current Rating @ 100OC  
0.28W typ @ 2.4A 25OC  
0.33W max @ 4A 25OC  
0.44W typ @ 6A 25OC  
0.78W max @ 10A 25OC  
1.01W typ @ 12A 25OC  
2.35W max @ 20A 25OC  
Power Dissipation  
(including Control Power)  
0.35W max @ 4A 100OC 0.90W max @ 10A 100OC 2.87W max @ 20A 100OC  
13mV typ @ 2.4A 25OC  
21mV max @ 4A 25OC  
26mV max @ 4A 100OC  
32mV typ @ 6A 25OC  
63mV typ @ 12A 25OC  
Max Voltage Drop  
53mV max @ 10A 25OC  
105mV max @ 20A 25OC  
65mV max @ 10A 100OC 131mV max @ 20A 100OC  
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Phone (631) 586 7600 Fax (631) 242 9798 www.sensitron.com sales@sensitron.com Page 6  
SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
SPDP25D28-1  
SPDP25D28-1 Set for  
SPDP25D28-1 Set for  
SPDP25D28-1 Set for  
25 Amp Rating  
25A  
5.0 Amp Rating  
5.0A  
12.5 Amp Rating  
12.5A  
Current Rating @ 100OC  
0.29W typ @ 3A 25OC  
0.36W max @ 5A 25OC  
1.13W typ @ 15A 25OC  
2.84W max @ 25A 25OC  
0.49W typ @ 7.5A 25OC  
0.92W max @ 12.5A 25OC  
Power Dissipation  
(including Control Power)  
0.39W max @ 5A 100OC 1.12W max @ 12.5A 100OC 3.64W max @ 25A 100OC  
13mV typ @ 3A 25OC  
21mV max @ 5A 25OC  
28mV max @ 5A 100OC  
32mV typ @ 7.5A 25OC  
64mV typ @ 15A 25OC  
Max Voltage Drop  
53mV max @ 12.5A 25OC  
107mV max @ 25A 25OC  
69mV max @ 12.5A 100OC 139mV max @ 25A 100OC  
SPDP30D28-1  
SPDP30D28-1 Set for  
6.0 Amp Rating  
6.0A  
SPDP30D28-1 Set for  
15 Amp Rating  
15A  
SPDP30D28-1 Set for  
30 Amp Rating  
30A  
Current Rating @ 100OC  
0.31W typ @ 3.6A 25OC  
0.40W max @ 6A 25OC  
0.60W typ @ 9A 25OC  
1.21Wmax @ 15A 25OC  
1.63W typ @ 18A 25OC  
4.08W max @ 30A 25OC  
Power Dissipation  
(including Control Power)  
0.45W max @ 6A 100OC 1.50W max @ 15A 100OC 5.24W max @ 30A 100OC  
15mV typ @ 3.6A 25OC  
26mV max @ 6A 25OC  
33mV max @ 6A 100OC  
38mV typ @ 9A 25OC  
77mV typ @ 18A 25OC  
Max Voltage Drop  
64mV max @ 15A 25OC  
129mV max @ 30A 25OC  
83mV max @ 15A 100OC 166mV max @ 30A 100OC  
Figure 5 - Electrical Block Diagram  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Description  
Figure 5 shows the block diagram of the SPDPXXD28-1 series. It uses a low-power triple channel digital  
isolator Si8431 device for digital I/O. These are CMOS devices that employ an RF coupler to transmit digital  
information across an isolation barrier. Very high speed operation at low power levels is achieved. The  
operation of a Si8431 channel is analogous to that of an opto coupler, except an RF carrier is modulated instead  
of light. This simple architecture provides a robust isolated data path and requires no special considerations or  
initialization at start-up. A channel consists of an RF Transmitter and RF Receiver separated by a  
semiconductor-based isolation barrier. Transmitter input modulates the carrier provided by an RF oscillator  
using on/off keying. The Receiver contains a demodulator that decodes the input state according to its RF  
energy content and applies the result to the output via the output driver. This RF on/off keying scheme is  
superior to pulse code schemes as it provides best-in-class noise immunity, low power consumption, and better  
immunity to magnetic fields.  
The block labeled “Control & Protection Circuitry” gets power from the DC-DC converter and is referenced to the  
output of the SSPC. This block contains an amplifier to gain up the voltage developed across the sense  
resistor. It also contains a microcontroller with on-board timers, A/D converter, clock generator and independent  
watchdog timer. The microcontroller implements a precision I2t protection curve as well as an Instant Trip  
function to protect the wiring and to protect itself. It performs all of the functions of multiple analog comparators  
and discrete logic in one high-reliability component.  
The “Control & Protection Circuitry” block also has the ability to adjust the current rating of each model of the  
SPDPXXD28-1 Series over a 5:1 range. If the “Gain” terminal is left open, the SSPC will be set for maximum  
rating. If the “Gain” terminal is connected directly to the “Gain Return” terminal, the SSPC will be set for 1/5 of  
the maximum rating. Furthermore, a resistor connected between the “Gain” terminal and the “Gain Return”  
terminal will set a rating between maximum and 1/5 of maximum. See Figure 10 for the relationship between  
rating and resistor value.  
The code programmed in the microcontroller acquires the output of the internal A/D converter, squares the  
result and applies it to a simulated RC circuit. It checks the output of the simulated circuit to determine whether  
or not to trip (turn off the power Mosfets). Because the microcontroller simulates an analog RC circuit, the  
SSPC has ‘thermal memory’. That is, it trips faster if there had been current flowing prior to the overload than if  
there hadn’t been current flowing. This behavior imitates thermal circuit breakers and better protects the  
application’s wiring since the wiring cannot take as much an overload if current had been flowing prior to the  
overload.  
The watchdog timer operates from its own internal clock so a failure of the main clock will not stop the watchdog  
timer. The code programmed in the microcontroller will periodically reset the watchdog timer preventing it from  
timing out. If the code malfunctions for any reason, the watchdog timer is not reset and it times out. When the  
watchdog timer times out, it resets the microcontroller. Since the code is designed to detect levels and not  
edges, the output of the module, and therefore the output of the SPDPXXD28-1, immediately reflects the  
command on its input.  
The Power Mosfets used in the SPDPXXD28-1 Series have been selected for very low Rds(on) and results in low  
voltage drop and low power dissipation. In most applications, the SPDPXXD28-1 will be operated at 50 – 60%  
of rated current to provide a safety margin. As can be seen in Table 1, when the SPDP25D28-1 is operated at  
15 Amps, 60% of rated current, it only dissipates 1.0 Watt at room temperature. No heat sinking is required for  
this condition. However, if the SPDP25D28-1 is to be operated at maximum rating and/or at elevated  
temperatures, the dissipation can exceed 4 Watts and heat sinking is required. Some heat sinking can be  
accomplished by adding copper area to the LINE and LOAD pins, a heatsink can be epoxy attached to the  
surface of the module or a flat copper or aluminum heatsink can be sandwiched between the SPDP25D28-1  
and the printed circuit board using a thermal pad to maximize heat transfer. Each application should be  
evaluated at maximum expected constant current. The lower current models in the SPDPXXD28-1 Series do  
not require heat sinking under all conditions.  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
For overloads, no heat sinking is required provided the SPDPXXD28-1 Series is allowed some time to cool  
down. The SPDPXXD28-1 has sufficient thermal mass that the temperature will rise only a few degrees under  
the worst-case overload. Repetitive overloads should be avoided. When the SPDPXXD28-1 reports a trip  
condition, the controller driving the SPDPXXD28-1 should allow no more than four repetitions and then allow  
thirty seconds to cool down before trying to turn on again.  
The SPDPXXD28-1 will trip on overloads in the ALWAYS TRIP region shown in Figure 1 and will never trip  
when in the NEVER TRIP region. The SPDPXXD28-1 can be reset by bringing the CONTROL pin to a logic  
low. When the CONTROL pin is brought back to logic high, the SPDPXXD28-1 will turn back on. If the  
overload is still present, the SPDPXXD28-1 will trip again. Cycling the 5 Volt BIAS power will also reset the  
SPDPXXD28-1. If the CONTROL pin is at logic high when the BIAS power is cycled, the SPDPXXD28-1 will  
turn back on when the BIAS power is re-applied.  
Status Outputs  
The LOAD and GATE status outputs of the SPDPXXD28-1 show whether or not the load is drawing current and  
Power Mosfet switch is on. A logic high on the LOAD status output shows that the load draws < 5% of rated  
load and a logic low shows that the load draws > 15% of rated current. A load that draws between 5% and 15%  
of rated current could result in either a high or low logic level on the LOAD status output. Logic high on the  
GATE output indicates that the Power Mosfet switch is on while a logic low indicates that the switch is off.  
As can be seen in Table 6, of the 8 possible states for the combination of CONTROL, LOAD and GATE, only 3  
states represent valid SSPC operation. The other 5 states indicate either a failed SSPC or, more likely, a short  
to ground or a short to the BIAS supply of one of the logic outputs. By comparing the CONTROL input with the  
LOAD and GATE outputs, the user can determine whether or not the load is supposed to be ON (GATE),  
whether or not it’s drawing current (GATE) and whether or not the LOAD and GATE outputs are valid responses  
to the CONTROL input.  
Table 6 – CONTROL, LOAD & GATE Truth Table  
State CONTROL LOAD  
GATE  
Comments  
1
2
3
4
5
6
7
8
L
L
L
L
H
H
H
H
L
L
H
H
L
L
H
H
L
H
L
H
L
H
L
SSPC failure or shorted LOAD output to ground  
SSPC failure  
Normal OFF condition  
SSPC failure or shorted GATE output to BIAS supply  
SSPC failure or shorted GATE output to ground  
Normal ON condition with load current > 15% rated current  
Tripped  
H
Normal ON condition with load current < 5% rated current  
Wire Size  
MIL-W-5088L has a chart the shows wire size as a function of wire temperature and current. This chart is for a  
single copper wire in free air. For an ambient temperature of 70 oC, the chart allows an 18-gauge wire to handle  
o
o
25 Amps continuously at a wire temperature of 200 C – a wire temperature rise of 130 C. For a wire  
temperature limited to 150 oC, the chart requires a 16-gauge wire and for a wire temperature of 105 oC, the chart  
requires a 14-gauge wire.  
Amendment 1 of MIL-W-5088L has a table for copper wire in a bundle, group or harness with condition on the  
number of wires, percent of total harness capacity, etc. This table shows that a 12 gauge wire is necessary for  
200 oC operation, 10-gauge for 150 oC and 8-gauge for 105 oC.  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
MIL-W-5088L has various figures showing derating for harnesses as a function of the number of current carrying  
conductors for different altitudes. MIL-W-5088L only specifies wire for DC or RMS AC conditions, not for  
transient or overload conditions. MIL-W-5088L and its amendment should be consulted to determine minimum  
wire sizes for other currents and conditions.  
For transient or overload conditions, the transient or overload happens so quickly that heat is not transferred  
from the wire to the surroundings. The heat caused by the I2R heating of the wire causes the temperature to  
rise at a linear rate controlled by the heat capacity of the wire. The equation for this linear rise in temperature,  
with respect to time, can be solved as: I2t = constant. Every wire has an I2t rating that’s dependent on the  
temperature rise allowed and the diameter of the wire. If the I2t rating of the SSPC or circuit breaker is less than  
the I2t rating of the wire, then the SSPC or circuit breaker can protect the wire. The maximum I2t rating for the  
SPDP25D28-1 is 7.45 x 103 Amp2-Seconds. Every wire size in the paragraphs above has an I2t rating that  
exceeds the SPDP25D28-1 I2t rating for the temperature rises stated. Therefore, to select a wire size, it’s  
simply a matter of determining the maximum temperature rise of the application and deciding whether or not the  
wire will be in a bundle and use the information above. Similarly, the I2t ratings for the SPDP12D28-1 and  
SPDP05D28-1 are 1.72 x 103 Amp2-Seconds and 300 Amp2-Seconds, respectively.  
Application Connections  
The SPDPXXD28-1 Series may be configured as a high-side or low-side switch and may be used in positive or  
negative supply applications.  
Figure 6 – High-Side Switch, Positive Supply  
Figure 6 shows the connections as a high-side switch with a positive power supply.  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Figure 7 – Low-Side Switch, Positive Supply  
Figure 7 shows a low-side switch with a negative power supply. Note that the PWRGND pin is now connected  
to the LINE pin (see Rise/Fall Time paragraph below for more information on the PWRGND pin).  
Figures 8 and Figure 9 show negative supply high-side switch and low-side switch implementations. Again,  
note the connection of the PWRGND pin.  
Figure 8 – High Side Switch, Negative Supply  
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SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Figure 9 – Low Side Switch, Negative Supply  
Rise Time & Fall Time  
The rise and fall times of the SPDPXXD28-1 are pre-set at the factory for a nominal 100μS with a LINE supply of  
28VDC (see Table 3 for min/max limits). The rise and fall times will vary linearly with supply voltage. The  
PWRGND pin is used to control the rise and fall times. If the PWRGND pin is left open, the rise and fall times  
will be about 50uS. Leaving the PWRGND pin open can be useful when a faster rise or fall time is desirable.  
With the PWRGND pin connected as in Figures 6 through 9, the SPDPXXD28-1, when set for a 25 Amp rating,  
can turn on into a capacitive load of 440uF, min, 880uF, typ, without tripping for any power supply voltage within  
the ratings. The capacitive load capability is proportional to current rating and can be therefore easily calculated  
for each model and setting in the SPDPXXD28-1 Series.  
Wiring and Load Inductance  
Wiring inductance can cause voltage transients when the SPDPXXD28-1 is switched off due to an overload.  
Generally, these transients are small but must be considered when long wires are used on either the LINE or  
LOAD pins or both. A 10 foot length of wire in free air will cause a transient voltage of about 10 Volts when the  
SPDP25D28-1 trips at an Instant Trip level of 250 Amps. At the rated load current of 25 Amps, the voltage  
transient will be about 1 Volt. If longer wire lengths are used, a transient suppressor may be used at the LINE  
pin and a power diode may be used at the LOAD pin so that the total voltage between the LINE and LOAD pins  
is less than 50 Volts.  
When powering inductive loads, the negative voltage transient at the LOAD pin can cause the voltage between  
LINE and LOAD to exceed the SPDPXXD28-1 rating of 50 Volts and a power diode from the LOAD pin to  
ground must be used. The cathode of the power diode is connected to the LOAD pin with the anode connected  
to ground. The power diode must be able to carry the load current when the SPDPXXD28-1 switches off.  
Voltage transients due to wiring or load inductance are proportional to the operating current.  
©2010 Sensitron Semiconductor 221 West Industry Court Deer Park, NY 11729-4681  
Phone (631) 586 7600 Fax (631) 242 9798 www.sensitron.com sales@sensitron.com Page 12  
SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
Paralleling  
For example, putting two SPDP25D28-1s in parallel will not double the rating to 50 Amps. Due to differences in  
the Rds(on) of the Power Mosfets in the SSPCs, the current will not share equally. In addition, there are unit-to-  
unit differences in the trip curves so that two SPDP25D28-1s in parallel may possibly trip at 35 Amps. Also,  
both SPDP25D28-1s will not trip together; the SPDP25D28 carrying the higher current will trip first followed by  
the other SPDP25D28-1. Multiple SPDP25D28-1s may be used in parallel as long as these complexities are  
appreciated. Due not parallel different models of this series as the current sharing will not be predictable.  
Board Layout  
The current-carrying power circuit should be kept well away from the control circuit and other low-level circuits in  
the system. It’s unlikely, but possible, that magnetic coupling could affect the control circuit when turning normal  
loads on and off. However, in the case of an overload, the magnetic coupling could be 10 times greater than  
with normal loads. Effects of such coupling could cause ‘chattering’ when turning on and off, oscillation, and the  
possibility of turning the SPDPXXD28-1 back on after an overload. The SPDPXXD28-1 Series is a Trip-Free  
device. Once tripped it will not turn back on until reset and commanded on again. Reset is accomplished by  
bringing the CONTROL pin low and turning the SSPC back on is accomplished by bringing the CONTROL pin  
high. Sufficient magnetic coupling between the current-carrying power circuit and the control circuit can negate  
the Trip-Free characteristic.  
MIL-STD-704F and MIL-STD-1275B  
These standards cover the characteristics of the electrical systems in Military Aircraft and Vehicles. The  
SPDPXXD28-1 Series meets all of the requirements of MIL-STD-704F including Normal, Emergency, Abnormal  
and Electric Starting conditions with the Ripple, Distortion Factor and Distortion Spectrum defined in the  
standard. The SPDPXXD28-1 Series also meets all of the requirements of MIL-STD-1275B including operation  
with Battery and Generator, Generator Only and Battery Only for all of the conditions described in the standard  
including Cranking, Surges, Spikes and Ripple. In addition, the SPDPXXD28-1 Series can withstand + 600 V  
spikes for 10μS. This capability is beyond that required by the standards cited above.  
Figure 10 – SPDPXXD28-1  
Rating vs. “Gain” and “Gain Return” Terminals  
100.00%  
90.00%  
80.00%  
70.00%  
60.00%  
50.00%  
40.00%  
30.00%  
20.00%  
10.00%  
0.00%  
10  
100  
1000  
10000  
100000  
Proramming Resistor  
©2010 Sensitron Semiconductor 221 West Industry Court Deer Park, NY 11729-4681  
Phone (631) 586 7600 Fax (631) 242 9798 www.sensitron.com sales@sensitron.com Page 13  
SENSITRON  
SPDPXXD28-1 SERIES  
SEMICONDUCTOR  
TECHNICAL DATA  
DATASHEET 5186, Rev -  
ORDERING INFORMATION  
SPDPXXD28-1: XX is for maximum amps. For example, SPDP05D28-1 is programmable from 1A to 5A.  
DISCLAIMER:  
1- The information given herein, including the specifications and dimensions, is subject to change without prior notice to improve product  
characteristics. Before ordering, purchasers are advised to contact the Sensitron Semiconductor sales department for the latest version of the  
datasheet(s).  
2- In cases where extremely high reliability is required (such as use in nuclear power control, aerospace and aviation, traffic equipment, medical  
equipment , and safety equipment) , safety should be ensured by using semiconductor devices that feature assured safety or by means of users’  
fail-safe precautions or other arrangement .  
3- In no event shall Sensitron Semiconductor be liable for any damages that may result from an accident or any other cause during operation of  
the user’s units according to the datasheet(s). Sensitron Semiconductor assumes no responsibility for any intellectual property claims or any  
other problems that may result from applications of information, products or circuits described in the datasheets.  
4- In no event shall Sensitron Semiconductor be liable for any failure in a semiconductor device or any secondary damage resulting from use at  
a value exceeding the absolute maximum rating.  
5- No license is granted by the datasheet(s) under any patents or other rights of any third party or Sensitron Semiconductor.  
6- The datasheet(s) may not be reproduced or duplicated, in any form, in whole or part, without the expressed written permission of Sensitron  
Semiconductor.  
7- The products (technologies) described in the datasheet(s) are not to be provided to any party whose purpose in their application will hinder  
maintenance of international peace and safety nor are they to be applied to that purpose by their direct purchasers or any third party. When  
exporting these products (technologies), the necessary procedures are to be taken in accordance with related laws and regulations.  
©2010 Sensitron Semiconductor 221 West Industry Court Deer Park, NY 11729-4681  
Phone (631) 586 7600 Fax (631) 242 9798 www.sensitron.com sales@sensitron.com Page 14  

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