SRPC0.5D28 [SENSITRON]
DC-DC Regulated Power Supply Module;
| 型号： | SRPC0.5D28 |
| 厂家： | 
SENSITRON |
| 描述： | DC-DC Regulated Power Supply Module |
| 文件： | 总13页 (文件大小：172K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
28V 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 25A 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 5 SSPC current levels. The 7A model is
available with failsafe operation (non-latching)
SRPC0.5D28
SRPC2D28
SRPC7D28
SRPC15D28
SRPC25D28
SRPC7D28F
28VDC 0.5A Latching
28VDC 2A
28VDC 7A
28VDC 15A
28VDC 25A
28VDC 7A
Latching
Latching
Latching
Latching
Non-Latching
Module Features:
• No additional heat sinking or external cooling required
• Extremely Low Power, No Derating Over the Full Temperature Range
• Potted Module
• Solid State Reliability
Electrical Features:
• 28VDC Input with Very Low Voltage Drop; 180mV, max. @ 25A
• True I2t Protection up to 17X rating with Nuisance Trip Suppression
• Instant Trip Protection (200 μsec typ)
• Unlimited Interrupt Capability; Repetitive Fault Handling Capability
• Thermal Memory
• Internally Generated Isolated Supply to Drive the Switch
• Low Aux Supply Current: 10 mA typ @ 5V DC
• High Control Circuit Isolation: 100V DC Control to Power Circuit
• Soft Turn-On to Reduce EMC Issues
• EMI Tolerant
• Input control doubles as reset; Reset Circuit is Trip-Free
• TTL/CMOS Compatible, Optically Isolated, Input and Outputs
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Table 1: Electrical Characteristics (at 25°C and VAUX = 5.0V DC unless otherwise specified)
Control & Status (TTL/CMOS Compatible)
5.0V DC Nominal, 7V DC Absolute Maximum
4.5V to 5.5 VDC
AUX Supply (Vcc)
10 mA typ
AUX Supply (Vcc) Current
20 mA, max
Voh=3.7V, min, at Ioh = -8mA
Status & BIT/TRIP Signals
Vol=0.4V, max, at Iol = 2mA
CONTROL Signal
VIL
VIH
RIN
0.8V, max
2V, min
101 kOhm, typ
Power
Input Voltage – Continuous
– Transient
9V to 40V DC, 43V DC Absolute Maximum
+100V or –100V Spike (< 10 µs)
See
Table 5
Power Dissipation
See
Current
Table 5
See Trip Curves, Figure 1,Figure 2,Figure 3
See
Table 5
110% min
Max Voltage Drop
Max current without tripping
Trip time
See Trip Curves, Figure 1,Figure 2,Figure 3
Protection
Instant Trip
See Trip Curves, Figure 1,Figure 2,Figure 3
Table 2: Physical Characteristics
Temperature
Operating Temperature
Storage Temperature
TA = -40 °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
Weight
2.00” x 1.95” x 0.44”
60 grams typ, 140 grams max
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Figure 1: Trip Curve for SRPC0.5D28 and SRPC2D28
Figure 2: Trip Curve for SRPC7D28 and SRPC7D28F
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Figure 3: Trip Curve for SRPC15D28 and SRPC25D28
Figure 4: Timing Diagram
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Table 3: Signal Timing (-40°C to 100°C, 28VDC_IN = 28VDC)
Parameter
Symbol Min
Max
500
1
200
2
500
1
200
2
Units
μs
ms
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
50
50
μs
ms
μs
ms
Load Current Fall Time
μs
ms
Turn OFF to LOAD Status Delay
Note: Current Fall Time from trip is dependent on magnitude of overload
All dimensions are in inches
Figure 5: SRPC0.5D28 Mechanical Dimensions / Connector Keying
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Figure 6: SRPC2D28 Mechanical Dimensions / Connector Keying
Figure 7: SRPC7D28 Mechanical Dimensions / Connector Keying
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Figure 8: SRPC7D28F Mechanical Dimensions / Connector Keying
Figure 9: SRPC15D28 Mechanical Dimensions / Connector Keying
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Figure 10: SRPC25D28 Mechanical Dimensions / Connector Keying
Table 4: Pin Definitions
Pin Number Pin Name
Function
POWER IN
POWER IN
LOAD
1
2
3
4
28V DC, IN
28V DC, IN
28VDC, LOAD
28VDC, LOAD
LOAD
A1
A2
A3
A4
A5
NC
NC
NC
NC
No Connection
No Connection
No Connection
No Connection
POWER RTN
28V RETURN
B1
B2
B3
B4
B5
AUX. IN (5VDC)
AUX. COMMON
BIT/TRIP
STATUS
CONTROL
DC Bias Supply
DC Bias Supply Return
Switch Status Output
Load Status Output
Control Input
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Table 5: Model Current Rating, Power Dissipation, Voltage Drop
Model
Current
Rating
0.5 A
2 A
Pdiss
25°C
Pdiss
100°C
Vdrop
25°C
Vdrop
100°C
34 mV max
45 mV max
100 mV max
140 mV max
200 mV max
100 mV max
SRPC0.5D28
SRPC2D28
SRPC7D28
SRPC15D28
SRPC25D28
SRPC7D28F
1 W max
1 W max
1.6 W max
3 W max
5.4 W max
1.6 W max
1 W max
1 W max
1.75 W max
3.5 W max
6 W max
1.75 W max
33 mV max
40 mV max
90 mV max
130 mV max
180 mV max
90 mV max
7 A
15 A
25 A
7 A
Figure 11: Electrical Block Diagram
AUX_IN
28VDC_IN
DC-DC
28VDC_RTN
CONTROL
BIT/TRIP
Aux Loss 5v 15v Gate
Control
BIT
uController
STATUS
A/D
G
Status
28VDC_LOAD
AUX_COMMON
Description
Figure 11 shows the block diagram of the GD SSPC Series. A 74HCT1G04 device is used for the CONTROL
input and the BIT/TRIP and STATUS digital outputs. These digital I/O are TTL and CMOS compatible. The
outputs can each drive more than 1 standard TTL loads. This digital circuitry is optically isolated from the 28V
power and the microcontroller circuitry.
Isolated power for the microcontroller electronics is generated from the DC-DC converter off of the 28VDC_IN
power. This isolated power is referenced to the 28VDC_LOAD output of the SSPC.
Load current is measured by the microcontroller using an integrated A/D, a voltage amplifier, ‘G’, and a current
sense resistor, Rsense. The microcontroller code implements a precision I2t protection curve as well as an
Instant Trip function. This circuit breaker action protects the user application wiring as well as the power
components of the SSPC itself. The microcontroller performs all of the functions of multiple analog comparators
and discrete logic in one high-reliability component. The STATUS output is set active when >10% rated load
current is measured and inactive otherwise.
The I2t software algorithm in the microcontroller performs a reading at the A/D converter, squares this reading,
and applies it to a simulated RC circuit. The algorithm trips the output (turns off the power Mosfets) when the
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
simulated RC output becomes too high. 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 of an overload if current had been flowing prior to the overload.
The CONTROL input is monitored by the microprocessor. When this input is active, the power mosfet is turned
on. When inactive, the mosfet is turned off. The turning on of the mosfet is overridden if an I2t overload or
instant trip condition are detected. In either of these conditions the mosfet is turned off independently of the
CONTROL input and may not be turned on again until a ‘reset’ is performed.
The BIT/TRIP output goes active whenever the mosfet is turned on and inactive whenever the mosfet is turned
off.
The AUX LOSS input is used to detect loss of AUX_IN power. For the latching models (all but SRPC7D28F),
when AUX LOSS is detected, the mosfet state is held on/off based on the last CONTROL input on/off that was
detected. The SPRC7D28F ignores this input.
The microcontroller has a watchdog timer that can detect certain types of failures in software execution. The
software programmed in the microcontroller is set to periodically reset the free running watchdog timer. If the
software malfunctions in such a way that the watchdog timer cannot be reset, the watchdog times out and resets
the processor hardware. The watchdog timer operates from its own internal clock so a failure of the main
internal clock will not stop the watchdog timer. On watchdog timeout the processor will restart just as if 28V
power had been lost and restored. Since the code is designed to detect levels and not edges on the Control
input, the output of the SSPC immediately reflects the state of the Control input after reset.
The Power Mosfets used in the SSPC have been selected for very low Rds(on). This results in low voltage drop
across and low power dissipation in the SSPC. In most applications, the Mosfets will be operated at 50% to
60% of rated current to provide a safety margin. As can be seen in Table 5, when the SRPC25D28 is operated
at 25 Amps, it only dissipates 3.0 Watts at room temperature. When operated at 60% rated current, the I2R
power reduces to just over 1 Watt. No heat sinking is required for this condition. Each application should be
evaluated at maximum expected constant current. Because the mosfet’s are thermally attached to the module
metal lid, temperature rise from power dissipation may be controlled by headsinking the lid. The lower current
models in the series (7A and below) do not require heat sinking under all conditions.
For overloads, no heat sinking is required provided the SSPC is allowed some time to cool down. The design
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 SSPC reports a trip condition, the controller driving the
SSPC should allow no more than four repetitions and then allow thirty seconds to cool down before trying to turn
on again.
The SSPC will trip on overloads in the ALWAYS TRIP region shown in the trip curves of Figure 1, Figure 2, and
Figure 3. The SSPC will never trip when operated in the NEVER TRIP region. When overload occurs, the
SSPC will trip, turning off the output mosfet. The SSPC mosfet will remain off until reset. The SSPC can be
reset by bringing the CONTROL pin to a logic low. When the CONTROL pin is brought back to logic high, the
SSPC will turn back on. If the overload is still present, the SSPC will trip again. Removing and reapplying
power to the 28VDC_IN pin will also reset the SSPC. If the CONTROL pin is at logic high when the 28VDC_IN
power is cycled off/on, the SSPC will turn back on when the 28VDC_IN power is re-applied.
For all models except the SRPC7D28F, removing AUX_IN power will not change the on;off state of the SSPC
mosfet. The last state commanded by CONTROL will be held until AUX_IN power is reapplied.
For the SRPC7D28F, removing AUX_IN power will immediately set the SSPC mosfet in the off state. When
AUX_IN power is restored, the mosfet state will follow that commanded by the CONTROL input.
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Logic Outputs
The STATUS and BIT/TRIP status outputs of the SSPC reflect the operating state of the SSPC. A logic high on
the STATUS output indicates that the current drawn on the 28V_LOAD output is < 10% of rated load. A logic
low shows that the current drawn from the 28V_LOAD output is > 10% of rated current. Because of load
detection tolerances, a load that draws between 5% and 15% of rated current could result in either a high or low
logic level on the STATUS output. Logic high on the BIT/TRIP 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, STATUS, and BIT/TRIP,
only 4 states represent valid SSPC operation. The other 4 states indicate either a failed SSPC or, more likely, a
short to Aux Common or a short to the AUX supply of one of the logic outputs. By comparing the CONTROL
input with the STATUS and BIT/TRIP outputs, the user can determine whether or not the load is supposed to be
ON, whether or not it’s drawing current, and whether or not the STATUS and BIT/TRIP outputs are valid
responses to the CONTROL input.
State 4 may be used as a normal operating mode for detecting loss of 28VDC IN voltage. Both STATUS and
BIT/TRIP will be logic high if AUX power is applied but 28VDC IN power is not.
Table 6: CONTROL, STATUS & BIT/TRIP Truth Table
State CONTROL STATUS BIT/TRIP 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 STATUS output to AUX Common
SSPC failure
Normal OFF condition
SSPC failure or 28VDC IN voltage too low
SSPC failure or shorted BIT/TRIP output to AUX Common
Normal ON condition with load current detected
Normal overcurrent trip condition
H
Normal ON condition with no load current detected
Wire Size
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
25A SSPC is 7.45 x 103 Amp2-Seconds. To select a wire size, it’s simply a matter of determining the maximum
temperature rise of the application, deciding whether or not the wire will be in a bundle, and use the information
above.
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
Application Connections
The connections to the SSPC in a typical application are shown in Figure 12.
Figure 12: Typical Application
+
28V
28VDC_IN
DC-DC
28VDC_RTN
AUX_IN
CONTROL
+
APPLICATION
5V
BIT/TRIP
CONTROLLER
28VDC_LOAD
STATUS
AUX_COMMON
Rise Time & Fall Time
The rise and fall times of the SSPC are pre-set at the factory for a nominal 100μS (see Table 3 for min/max
limits). The rise and fall times will vary linearly with supply voltage.
The SSPC’s can turn on into a capacitive load without tripping. Limits on capacitance are shown in Table 7.
Table 7: Allowed Load Capacitance
Model
Cload Allowed
20 uF
SRPC0.5D28
SRPC2D28
SRPC7D28
SRPC15D28
SRPC25D28
SRPC7D28F
90 uF
200 uF
280 uF
470 uF
200 uF
Wiring and Load Inductance
Wiring inductance can cause voltage transients when the SSPC is switched off due to an overload. Generally,
these transients are small but must be considered when long wires are used on either the 28VDC IN or 28V
LOAD pins or both. A 10 foot length of wire in free air will cause a transient voltage of about 10 Volts when the
25A SSPC trips at an Instant Trip level of 180 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 28VDC IN pin
and a power diode may be used at the 28VDC LOAD pin so that the total voltage between these pins is less
than 100 V.
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SENSITRON
SRPC Series
.5A to 25A
SEMICONDUCTOR
TECHNICAL DATA
DATASHEET 5100, Rev -
When powering inductive loads, the negative voltage transient at the 28VDC LOAD pin can cause the voltage
between 28VDC IN and 28VDC LOAD to exceed the SSPC rating of 100 Volts and a power diode from the 28V
DC LOAD pin to 28V RETURN must be used. The cathode of the power diode is connected to the 28VDC
LOAD pin with the anode connected to 28V RTN . The power diode must be able to carry the load current when
the SSPC switches off. Voltage transients due to wiring or load inductance are proportional to the operating
current. Therefore, transients are less of a problem for the lower current SSPC models.
Paralleling
For example, putting two 25A SSPCs 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 SSPCs in parallel may possibly trip at 35 Amps. Also, both SSPCs will
not trip together; the SSPC carrying the higher current will trip first followed by the other SSPC. Multiple SSPCs
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.
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 SSPC back on after an overload. The SSPC 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.
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.
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Semiconductor.
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