is a 28 VDC Solid State High Side Power Controller (SSPC) that is designed to replace electromagnetic
circuit breakers rated at 10 amperes. It is a high side switch utilizing N-channel vertical power FET technology with
integral charge pump. The SSPC provides a status output that signals a variety of conditions including over
temperature shutdown, overvoltage or undervoltage, over-current or short circuit. It will trip off for any of the above
conditions and automatically (based on an internal thermal time constant) cycle On/Off until the fault or the control
signal is removed.
Using vertical MOSFET technology, the SSPC offers extremely low “ON” resistance. This results in very low power
dissipation, which allows operation over the temperature range of –40°C to +85°C with minimal heat sinking.
ABSOLUTE MAXIMUM RATINGS
(@ T
C
= 25°C unless otherwise specified)
Input Control Current......................................................................................................................................................10 mA
Reverse Input Voltage (Control to Signal Ground)..................................................................................................... - 5 VDC
Pins to Case Isolation.............................................................................................................................................. 1000 VDC
Lead Temperature........................................................................................................................................................ +300°C
Junction Temperature .................................................................................................................................................. +150°C
Micropac Industries
cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac
reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
•
905 E. Walnut St., Garland, TX 75040
•
(972) 272-3571
•
Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
05/16/01
PRELIMINARY DATA SHEET
Package Configuration
53248
28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER
PIN #
1
2
3
4
5
6
7
8
9
10
FUNCTION
CONTROL
STATUS
SIGNAL GND
OUTPUT
OUTPUT
POWER IN
POWER IN
POWER GND
POWER GND
NC
Dimensions: inches
Functional Block Diagram
POWER
IN
VOLTAGE
REGULATOR
O/V
U/V
CURRENT
LIMIT
GATE
PROTECTION
CONTROL
ISOLATION/
CONTROL
LOGIC
CHARGE
PUMP
OUTPUT
DETECTION
OUTPUT
STATUS
SIGNAL GND
ISOLATION/
STATUS
TEMP
SENSE
LOAD
(POWER GND)
Micropac Industries
cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac
reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
•
905 E. Walnut St., Garland, TX 75040
•
(972) 272-3571
•
Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
05/16/01
PRELIMINARY DATA SHEET
53248
28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER
SPECIFICATIONS
(@ T
C
25°C unless otherwise specified)
Control Function
Input Type.........................................................................................................1.5 kΩ resistor in series with 1.3 V drop LED
Turn-on Control Current ..........................................................................................................................................2 mA (min)
Turn-off Control Current ....................................................................................................................................... 10
µA
(max)
Status Function
Open Collector transistor, V
CC
= +40 VDC (max)
Output High is V
CC
, Output Low is +0.4 V (max) @ I
CC
= 10 mA (max)
Status output transistor off (logic high) indicates unit is off.
Status output transistor on (V
≤
0.4 VDC) indicates unit is on.
Power Circuit
Supply Voltage (for normal operation)................................................................. 5 VDC (min), 28 VDC(typ), 33 VDC (max)
Continuous Current ........................................................................................................................................................... 10 A
= 25°C and Full Load.................................................................................................................. 4 W
Power Output Leakage Through Load ...........................................................................................................................15
µA
Trip Reset Time ................................................................................................................................ Temperature Dependent
Body Diode Current Capacity .......................................................................................................................................... 10 A
Quiescent Current (@ No load) ...................................................................................................................................... 8 mA
Temperature Range
Operating (Case) ..............................................................................................................................................-40°C to +85°C
Storage .......................................................................................................................................................... -55°C to +150°C
Thermal Resistance
Junction to Case.........................................................................................................................................................2.5 °C/W
Case to Ambient ...................................................................................................................................................... TBD °C/W
Physical Characteristics
See Package Configuration
Timing at 28 VDC (I
L
=1A)
Turn-on Time ................................................................................................................................................... 200
µsec
(max)
Status Turn-on Delay ...................................................................................................................................... 200
µsec
(max)
Turn-off Time ................................................................................................................................................... 250
µsec
(max)
Status Turn-off Delay ...................................................................................................................................... 300
µsec
(max)
Micropac Industries
cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac
reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
•
905 E. Walnut St., Garland, TX 75040
•
(972) 272-3571
•
Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
05/16/01
PRELIMINARY DATA SHEET
53248
28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER
FUNCTIONAL DESCRIPTION
The 53248 SSPC is a fully protected switch that offers a wide range of features. These include overvoltage and
undervoltage shutdown with automatic reset, overcurrent and short circuit protection provided by temperature
sensing with automatic reset when temperature drops to safe levels, built in transient protection and fully optically
isolated control and status lines. The overcurrent and short circuit protection are achieved through the
temperature-sensing feature of the controller. Overcurrent is sensed through the increasing R
DS(ON)
causing
increase power dissipation in the pass element, which additionally causes a further increase in R
DS(ON)
. As
junction temperature approaches +150°C, drive to the pass element is decreased, causing V
DS
to increase. When
the pass element temperature is between +150°C and +175°C, the drive to the pass element is removed and
current flow ceases. When the temperature is reduced approximately 10°C the device will resume operations.
This will continue until the overcurrent/short circuit is removed or the control is turned off. Status will indicate the
overcurrent condition until the fault is removed.
Peak Current Limits vs. Junction Temperature*
Junction Temperature Min
Typ
Max Unit
-40°C
48
56
65
A
+25°C
40
50
58
A
+150°C
31
37
45
A
*Peak
Duration - Typical Waveform
Overvoltage and Undervoltage Limits
Overvoltage
+34 VDC to +43 VDC
Undervoltage
+3.4 VDC to +5.0 VDC
Overvoltage hysteresis
Typical +1.0 VDC
Undervoltage hysteresis
Typical +0.5 VDC
(T
j
= –40°C to +150°C)
Short Circuit Protection:
Short-While-On Peak Duration @ 25°C
70
60
Output Current (A)
50
40
30
20
10
0
-10
-20
0
20
40
Time (ms)
60
80
100
Micropac Industries
cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac
reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
•
905 E. Walnut St., Garland, TX 75040
•
(972) 272-3571
•
Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
05/16/01
PRELIMINARY DATA SHEET
53248
28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER
APPLICATION INFORMATION
The cable harness occupies an important position in the total network to be protected. The wide variety and in
some cases considerable length and packing density used makes them particularly susceptible to persistent
overloads and overheating. The maximum current carrying capacity of a cable depends on its resistance, type of
insulation material and the ambient temperature. A cable, including insulation, generally consists of at least two
materials with different thermal capacitance and thermal resistance. The maximum temperatures of most cables
are at least +150°C (depending on the insulation properties) which is very close to the maximum junction
temperature of the SSPC (Shutdown). Since under overcurrent or short circuit conditions, the unit resistance per
unit length for the cable is much less than the R
DS
of the SSPC, the unit heating will also be much less. Under
these conditions, it is apparent that the SSPC can adequately protect properly selected cabling.
The following formulas provide methods for calculating the primary parameters.
Trip Current
I
trip
= {(T
j max
– T
a
)/[R
θja
][R
ON (Tj max)
]}
1/2
T
j max
T
a
=
=
Maximum Trip Temperature
Ambient Temperature
R
θja
= Thermal Resistance, Junction to Ambient
R
ON
(Tj max)
= On-state resistance at Trip Temperature
On-state Resistance
R
ON
(T)
=
{(Y
2
– Y
1
)T
2
+
(300)(Y
2
– Y
1
)T +
(67500)Y
1
– (8125)Y
2
} / 59375
Y
1
= R
ON
at +25°C
Y
2
= R
ON
at +150°C
T = T
j
at temperature of interest in °C
With the above information, the temperature and current trip can be determined based upon the type of mounting
chosen and the ambient temperatures of operation.
Precaution
When a short circuit causes turn-off of the SSPC, precautions must be taken to limit transient voltages generated by
any inductance in the load. External protection is recommended, either across the switch or across the load, should
the application result in energies beyond this level.
Micropac Industries
cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac
reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
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