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Part: 90028-20
Category:
Power Management
-> Power Distribution/Switches
-> Solid State Power Controllers
Description: Voltage Range = 20 to 36 VDC ;; Current Range = 5 to 20 Amps ;; Status = 8 States Ttl/cmos ;; Forward Voltage Drop = N/a ;; On Resistance = ;; Programmable Instant Trip = 400 to 1200% ;; Instant Trip Time = 25 Usec. Max.
Company: National Hybrid (NHI)
Datasheet: Download 90028-20 datasheet File size : 287 kB
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Datasheet text preview:
SERIES 9000028 & 270-VDC, @10 & 20 AMPS
GENERAL DESCRIPTION Series 90000 Solid-State Power Controllers are TTL-controlled power switches with programmable trip characteristics designed for use as solid-state replacements for 3- to 20-ampere circuit breakers.
· Four DC versions--28 and 270 VDC, 10 and 20 Amperes. · Externally programmable for trip delay and current trip prints. · Status reporting permits remote sensing of trip, over-temperature, and additional operating conditions. · Thick-film hybrid technology delivers high reliability in small size. · Low junction-to-case thermal resistance--achieved through metallurgical bonding of power devices directly on mounting tabs.
APPLICATIONS Designed for use in land, air, sea and space deployed systems that require low cost and high reliability power control. FEATURES
· INSTANT TRIP PROTECTION--Pin-programmable to
1,200% of rating
· INTERNAL THERMAL OVERLOAD PROTECTION · OPTICALLY ISOLATED CONTROL STATUS CIRCUITRY · I2T PROTECTION--Pin-programmable to 30% of rating · MIL-STD-704 COMPLIANT · LOW `ON' RESISTANCE · LOW POWER DISSIPATION · HERMETICALLY SEALED · LOW COST · HIGH RELIABILITY Block Diagram
MAXIMUM RATINGS/ BREAKDOWN VOLTAGE SSPC Model Line/ Load Terminal-to-Signal Ground Bias Supply Voltage Control Input-to-Signal Ground 90028-XX 100 VDC -0.5 to 7.0 VDC ±30 VDC STORAGE TEMPERATURE -65°C to +150°C. 90270-XX 600 VDC
RECOMMENDED OPERATING CONDITIONS 90028-XX 5 to 50 VDC 4.5 to 5.5 VDC 0 to 6.0 VDC OPERATING TEMPERATURE -55°C to 125°C 90270-XX 5 to 300 VDC
Table 1--Maximum Ratings and Recommended Operating Conditions
2200 Smithtown Ave., Ronkonkoma, NY 11779 · 516-981-2400 · FAX 516-981-8888 · ISO 9001 & Mil-Std-1772 Certified & Qualified
SERIES 9000028 & 270-VDC, @10 & 20 AMPS
UNDERSTANDING SOLID-STATE POWER CONTROLLERS As computer-controlled system technology advances, more system functions, including power control, fall under its command. Since mechanical circuit breakers do not lend themselves to this type of control, a solid-state solution was developed. Solid-State Power Controllers (SSPCs) were the result. To understand SSPC specifications, it is necessary to understand the mechanical circuit breaker. These devices protect wire harnesses from overheating, which may result from abnormally high current drains due to a malfunctioning system component. In addition, circuit breakers must be able to turn reactive loads on and off. Turning on into capacitive loads results in high inrush currents that may be more than 10 times their rated currents. Conversely, turning off highly inductive loads results in a large voltage, or inductive kick, which can exceed their voltage rating. Contact erosion caused by arcing in these load types severely limits circuit breaker life and produces severe EMI problems. Circuit breakers work by passing current through a bimetallic strip. When this strip heats, due to I2R power dissipation, the resultant deflection serves as a trip mechanism. The deflection is directly proportional to the temperature, and the temperature is proportional to the length of time it has dissipated its I2R power. Thus, the I2T curve, seen so often in SSPC data sheets. One of the significant advantages of SSPCs is the elimination of contact closure. The soft turn-on feature of SSPCs reduces the peak inrush current into capacitive loads, reducing EMI emissions greatly. In addition, during turn-off of inductive loads, stored energy can be dissipated in the pass element as well as a shunt diode. A multiplier and comparator duplicate the I2T trip characteristics. In addition to I2T circuitry, an instant trip circuit shuts off the SSPC when the inrush current exceeds a preset level, typically 800% of rated current. This forms the upper limit of the I2T curve. Referring to Figure #3, the heavy line shows the instant trip set to 400% of rated load. With decreasing current, the trip time increases. At rated current, the unit will trip in 10 seconds. As a convenience to our customers, NHI has designed its SSPC to allow external programming of both the instant trip point and the trip time.
I2 t Trip Curve
% of Rated Load Current
Figure 3--Typical I2 T Curves
The Series 90000 package provides superior electrical performance and lowest possible thermal resistance. Being a matched TCE system, the package will withstand stringent environmental conditions. The flexibility of the unique construction of the Series 90000 package allows for quick and inexpensive custom configurations.
2200 Smithtown Ave., Ronkonkoma, NY 11779 · 516-981-2400 · FAX 516-981-8888 · ISO 9001 & Mil-Std-1772 Certified & Qualified
SERIES 9000028 & 270-VDC, @10 & 20 AMPS
· INSTANT TRIP PROTECTION--Pin-programmable to · I2T PROTECTION--Pin-programmable to 30% of rating.
1,200% of rating. Series 90000 SSPCs incorporate a programmable instant trip feature. If the load current exceeds 400% of nominal rating, the unit will trip in less than 25µ seconds.*
· INTERNAL THERMAL OVERLOAD PROTECTION
Series 90000 SSPCs contain built-in thermal overload protection. The temperature of the switching elements is constantly monitored. If their temperature exceeds a safe limit, the unit will turn off and report an "over temperature" fault on its status outputs. Restart is automatic when the unit cools down approximately 15°C. For certain applications involving "battle override" requirements, the unit can be supplied such that an over-temperature condition is reported on the status output, without protecting itself by turning off.
· OPTICALLY ISOLATED CONTROL/STATUS CIRCUITRY
Series 90000 SSPCs feature programmable, I2T trip characteristics. This provides a relatively long (many seconds) trip time for modest overloads, while severe overloads will trip in milliseconds. By the addition of an external resistor, the actual trip point can be lowered to as low as 30% of its nominal rating. This allows a single type to be utilized in multiple applications, reducing inventory and costs.
· MIL-STD-704 COMPLIANT
NHi's SSPCs are compliant to the surge and transient requirements of MIL-STD-704. The off-state voltage blocking rating between the power and control/status pins is 100 VDC, with 500V minimum isolation for the 28V models. The 270V models exhibit 600VDC voltage blocking with a minimum of 1000V isolation.
· LOW LOSS--Forward voltage drop as low as 0.1 V on 28 VDC
Series 90000 SSPCs utilize optical couplers for the control and status reporting functions, ensuring complete isolation of these "TTL"-compatible functions from the power line. The control input is a diode-protected schmitt trigger gate for maximum noise immunity. The status outputs are "HC" CMOS compatible and can sink or source a minimum of 4 mA. * Programmable to 800% for 270V, 1200% for 28V, by the addition of an external resistor.
devices. Power MOSFETs provide low ON resistance. The 270 VDC units use low Vsat IGBTs (<1.2 Volts max.) as the pass elements. The unique construction of Series 90000 SSPCs utilizes the high-current input/output tabs as the mounting mechanism, and the heat sink for the high-power switching elements. The direct metallurgical bond between the switching elements and these tabs ensures extremely low electrical ON resistance and a minimum Øjc for the switching elements.
TYPICAL APPLICATIONS
Set to trip at 8 Amps and Instant trip at 80 Amps. This is a reasonable selection for operating a 200W lamp load.
2200 Smithtown Ave., Ronkonkoma, NY 11779 · 516-981-2400 · FAX 516-981-8888 · ISO 9001 & Mil-Std-1772 Certified & Qualified
SERIES 9000028 & 270-VDC, @10 & 20 AMPS
OPERATING CONSIDERATIONS
· Voltage Transients · Current Transients
In any circuit configuration, it is necessary to guard against voltage transients during Off switching of SSPCs. NHI SSPCs are equipped with an internal shunt diode for negative transients on the load side. On the Line side, the user is required to place a transient voltage suppressor. The transients at this terminal are positive and add to the line voltage. To prevent voltage breakdown of the switch elements, a Transorb of proper voltage and energy rating is utilized. Voltages on 28 VDC units should never exceed 100 VDC, and 600 VDC on 270 VDC units. Transorb should be installed as close as possible to the SSPC. Any inductance between the two compromises Transorb effectiveness.
During `turn on', capacitive loads cause high surge currents limited only by wire impedances. If the capacitance value is too great, the instant trip circuit might trip the SSPC. Soft turn-on of the MOSFET or IGBT reduces the effect of this condition. However, the design engineer shall carefully examine his system to ensure that high capacitive loads are minimized and that there is a reasonable resistance in the wiring to limit high surge currents.
SYMBOL
PARAMETER Control Input High Control Input Low Output High Output Low Supply Current
MIN
TYPICAL
MAX 3.15
UNITS Volts Volts
Vih ViL VOH VOL Idd
0.9 4.0 0.4 25 35
Volts Volts mA
Table 2 -- I/O Specifications
COMMAND 1 2 3 4 5 6 7 8 OFF OFF OFF OFF ON ON ON ON
CONTROL INPUT 0 0 0 0 1 1 1 1
STATUS S1 0 0 1 1 0 0 1 1
STATUS S2 0 1 0 1 0 1 0 1
OUTPUT OFF OFF OFF ON ON OFF OFF OFF
SSPC STATUS Normal Off Over Temp SSPC Fail SSPC Fail Normal On Over Temp Tripped SSPC Fail/ No line voltage
Table 3 -- Truth Table TTL/CMOS - compatible status lines report SSPC operating conditions to the system. Eight different states are possible, as described above.
2200 Smithtown Ave., Ronkonkoma, NY 11779 · 516-981-2400 · FAX 516-981-8888 · ISO 9001 & Mil-Std-1772 Certified & Qualified
SERIES 9000028 & 270-VDC, @10 & 20 AMPS
Figure 1: Current Trip Selection A resistor between pins 6 and 7 allows the user to set the trip point to any value between 3 and 10 Amps. The chart shows the relationship between the resistor value (Rext) and the trip current.
Figure 2: Instant Trip Selection Leaving Pin 8 open sets trip to 40 Amps. Connecting it to Pin 6 sets it to 120 Amps. (80 Amps for 270-Volt units.) Placing a resistor between pins 6 and 8 allows the user to set the INSTANT trip point to any value between 40 and 120 Amps (40 and 80 Amps for 270-Volt Units). The chart shows the relationship between the resistor value and the INSTANT trip current.
SYMBOL
PARAMETER Instantaneous Trip Current (90270-XX) 90028-10 On Resistance 90028-20 Forward Drop 90270-XX Leakage Current V out when off (No Load) Line to Load Capacitance Delay to ton Delay to tOFF Thermal Resistance Rise Time Fall Time Trip Time @ 200% of rated load Trip Time @ 300% of rated load
MIN 40 40
TYPICAL
MAX 120 80
UNITS Amps Amps Ohms Volts uAmps
IL RON
Fwd Drop
.025 .015 1.0 200
.03 .02 1.2
ILeak VO off CIO ton tOFF
0jc
1 1000 1 1 0.25 0.6 0.1 .2 .09 1
Volts pFarads mSecs mSecs °C/Watts mSecs mSecs Secs Secs
tr tf
2200 Smithtown Ave., Ronkonkoma, NY 11779 · 516-981-2400 · FAX 516-981-8888 · ISO 9001 & Mil-Std-1772 Certified & Qualified
Others parts begin by 90
90-1
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