SENSITRON SPDP10D28-1

SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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
MIL-STD-217F, Notice 2
Characteristics of 28 Volt DC Electrical Systems in Military Vehicles-4/20/04
Aircraft Electrical Power Characteristics 12 March 2004
Reliability Prediction of Electronic Equipment 28 Feb 1995
Module Features:
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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):
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•
•
•
•
•
•
•
•
•
•
•
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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
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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)
BIAS (Vcc)
BIAS (Vcc) Current
GATE Status, Load Status Signals
CONTROL Signal
Trip Reset
5.0V DC Nominal, 6.5V DC Absolute Maximum
4.5V to 5.5 VDC
60 mA typ
85 mA, max
Voh=4.6V min, at Ioh=-4mA
Vol=0.4V max, at Iol=4mA
VIh=2.0V min
VIl=0.8V max
Cycle CONTROL Signal
Power
Input Voltage – Continuous
– Transient
Power Dissipation
Max Voltage Drop
Max current without tripping
0 to 40V DC, 55V DC Absolute Maximum
+600V or –600V Spike (< 10 µs)
See Table 5
See Table 5
See Figure 1, Trip Curve
See Table 5
110% min
Trip time
Output Rise Time (turn ON)
Output Fall Time under normal turn-off
Output Fall Time under Fault
Min Load Requirement
See Figure 1, Trip Curve
200 μsec typ
200 μsec typ
50 μsec typ
Nil
Current
Protection
Short Circuit Protection
Instant Trip
Unlimited
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
Altitude
Case Dimensions
Operating Orientation
Weight
MTBF (Estimate: MIL STD 217F)
Up to 30,000 ft
Can be installed in an unpressurized area
1.875 L X 1.125 W X 0.550 H
Any
40 grams max
44 Khrs
@ 700C ambient, Full load, Ground Mobile
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
TECHNICAL DATA
DATASHEET 5186, Rev Figure 1 - Trip Curve
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
TECHNICAL DATA
DATASHEET 5186, Rev Figure 2 - Timing Diagram
Table 3 - Signal Timing – (-55 oC to 100 oC @ LINE = 28V DC)
Parameter
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
Load Current Fall Time
Turn OFF to LOAD Delay
Symbol
t0
t1
t2
t3
t4
t5
t6
t7
Min (μs)
100
150
100
300
100
200
150
150
Max (μs)
250
350
300
500
300
500
300
350
Note: Current Fall Time from trip dependent on magnitude of overload
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
TECHNICAL DATA
DATASHEET 5186, Rev -
Figure 3 - Mechanical Dimensions
All dimensions are in inches
Table 4 - Pin Definitions
Pin Number
1
2
3
4
5
6
7
8
9
10
Pin Name
BIAS
GND
GATE Status
LOAD Status
CONTROL Input
LINE
GAINRET
PWRGND
GAIN
LOAD
Function
+5V DC Supply
5V Return
Switch Status
Load Current Detection
On/Off Control
+28V DC Supply
Internally connected to LOAD (pin 10)
28V Return
Gain Adjust
Load Connection
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
TECHNICAL DATA
DATASHEET 5186, Rev -
Table 5 – Individual Model Ratings
SPDP05D28-1
SPDP05D28-1 Set for
1.0 Amp Rating
SPDP05D28-1 Set for
2.5 Amp Rating
SPDP05D28-1 Set for
5 Amp Rating
1.0A
0.26W typ @ 0.6A 25OC
0.27W max @ 1A 25OC
0.27W max @ 1A 100OC
9mV typ @ 0.6A 25OC
15mV max @ 1A 25OC
17mV max @ 1A 100OC
2.5A
0.28W typ @ 1.5A 25OC
0.34W max @ 2.5A 25OC
0.35W max @ 2.5A 100OC
22mV typ @ 1.5A 25OC
36mV max @ 2.5A 25OC
42mV max @ 2.5A 100OC
5A
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
SPDP10D28-1 Set for
2.0 Amp Rating
SPDP10D28-1 Set for
5 Amp Rating
SPDP10D28-1 Set for
10 Amp Rating
2.0A
0.26 W typ @ 1.2A 25OC
Power Dissipation
0.29W max @ 2A 25OC
(including Control Power)
0.30W max @ 2A 100OC
11mV typ @ 1.2A 25OC
19mV max @ 2A 25OC
Max Voltage Drop
23mV max @ 2A 100OC
5A
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
10A
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
SPDP15D28-1 Set for
7.5 Amp Rating
SPDP15D28-1 Set for
15 Amp Rating
7.5A
0.40W typ @ 4.5A 25OC
0.67W max @ 7.5A 25OC
0.79W max @ 7.5A 100OC
34mV typ @ 4.5A 25OC
56mV max @ 7.5A 25OC
73mV max @ 7.5A 100OC
15A
0.86W typ @ 9A 25OC
1.94W max @ 15A 25OC
2.43W max @ 15A 100OC
68mV typ @ 9A 25OC
113mV max @ 15A 25OC
145mV max @ 15A 100OC
SPDP20D28-1 Set for
4.0 Amp Rating
SPDP20D28-1 Set for
10 Amp Rating
SPDP20D28-1 Set for
20 Amp Rating
4.0A
0.28W typ @ 2.4A 25OC
0.33W max @ 4A 25OC
0.35W max @ 4A 100OC
13mV typ @ 2.4A 25OC
21mV max @ 4A 25OC
26mV max @ 4A 100OC
10A
0.44W typ @ 6A 25OC
0.78W max @ 10A 25OC
0.90W max @ 10A 100OC
32mV typ @ 6A 25OC
53mV max @ 10A 25OC
65mV max @ 10A 100OC
20A
1.01W typ @ 12A 25OC
2.35W max @ 20A 25OC
2.87W max @ 20A 100OC
63mV typ @ 12A 25OC
105mV max @ 20A 25OC
131mV max @ 20A 100OC
Current Rating @ 100OC
Power Dissipation
(including Control Power)
Max Voltage Drop
SPDP10D28-1
Current Rating @ 100OC
SPDP15D28-1
SPDP15D28-1 Set for
3.0 Amp Rating
Current Rating @ 100OC
3.0A
0.27W typ @ 1.8A 25OC
Power Dissipation
0.32W max @ 3A 25OC
(including Control Power)
0.34W max @ 3A 100OC
14mV typ @ 1.8A 25OC
23mV max @ 3A 25OC
Max Voltage Drop
29mV max @ 3A 100OC
SPDP20D28-1
Current Rating @ 100OC
Power Dissipation
(including Control Power)
Max Voltage Drop
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
TECHNICAL DATA
DATASHEET 5186, Rev SPDP25D28-1
Current Rating @ 100OC
Power Dissipation
(including Control Power)
Max Voltage Drop
SPDP25D28-1 Set for
5.0 Amp Rating
SPDP25D28-1 Set for
12.5 Amp Rating
5.0A
0.29W typ @ 3A 25OC
0.36W max @ 5A 25OC
0.39W max @ 5A 100OC
13mV typ @ 3A 25OC
21mV max @ 5A 25OC
28mV max @ 5A 100OC
12.5A
0.49W typ @ 7.5A 25OC
0.92W max @ 12.5A 25OC
SPDP25D28-1 Set for
25 Amp Rating
25A
1.13W typ @ 15A 25OC
2.84W max @ 25A 25OC
O
O
1.12W max @ 12.5A 100 C 3.64W max @ 25A 100 C
O
O
32mV typ @ 7.5A 25 C
64mV typ @ 15A 25 C
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
Current Rating @ 100OC
6.0A
0.31W typ @ 3.6A 25OC
Power Dissipation
0.40W max @ 6A 25OC
(including Control Power)
0.45W max @ 6A 100OC
15mV typ @ 3.6A 25OC
26mV max @ 6A 25OC
Max Voltage Drop
33mV max @ 6A 100OC
SPDP30D28-1 Set for
15 Amp Rating
SPDP30D28-1 Set for
30 Amp Rating
15A
0.60W typ @ 9A 25OC
1.21Wmax @ 15A 25OC
1.50W max @ 15A 100OC
38mV typ @ 9A 25OC
64mV max @ 15A 25OC
83mV max @ 15A 100OC
30A
1.63W typ @ 18A 25OC
4.08W max @ 30A 25OC
5.24W max @ 30A 100OC
77mV typ @ 18A 25OC
129mV max @ 30A 25OC
166mV max @ 30A 100OC
Figure 5 - Electrical Block Diagram
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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
1
2
3
4
5
6
7
8
CONTROL
L
L
L
L
H
H
H
H
LOAD
L
L
H
H
L
L
H
H
GATE
L
H
L
H
L
H
L
H
Comments
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
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
25 Amps continuously at a wire temperature of 200 oC – a wire temperature rise of 130 oC. 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
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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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SEMICONDUCTOR
SPDPXXD28-1 SERIES
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.
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SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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-tounit 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%
% of Current Rating
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 • [email protected] • Page 13
SENSITRON
SEMICONDUCTOR
SPDPXXD28-1 SERIES
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:
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characteristics. Before ordering, purchasers are advised to contact the Sensitron Semiconductor sales department for the latest version of the
datasheet(s).
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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 .
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©2010 Sensitron Semiconductor • 221 West Industry Court • Deer Park, NY 11729-4681
Phone (631) 586 7600 Fax (631) 242 9798 • www.sensitron.com • [email protected] • Page 14