Datasheet 53248 Datasheet (MII)

PRELIMINARY DATA SHEET

53248

Features:

Isolated Controls

•

Isolated Status Outputs

•

Fault Protection

•

28 VDC SOLID STATE POWER CONTROLLER

Thermal Shutdown
Undervoltage & Overvoltage Shutdown
Current Limitation
Short Circuit Protection

DESCRIPTION

HYBRID MICROELECTRONICS

Applications:

Power Distribution In Land/Air/Launch Vehicles

•

Motor Switch

•

Displays/Lamps/Controls

•

Industrial Automation

•

Switching Heaters

•

Test Equipment

•

Machine Control Equipment

•

•

Medical Lab Equipment

Mii

PRODUCTS DIVISION

The 53248 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

= 25°C unless otherwise specified)

(@ T

C

Input Control Current...................................................................................................................................................... 10 mA

Reverse Input Voltage (Control to Signal Ground)..................................................................................................... - 5 VDC

Pins to Case Isolation.............................................................................................................................................. 1000 VDC

Input-Output 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 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

05/16/01

PRELIMINARY DATA SHEET

53248

28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER

Package Configuration

PIN # FUNCTION

1

CONTROL
STATUS

2

SIGNAL GND

3

OUTPUT

4
5

OUTPUT
POWER IN

6

POWER IN

7
8

POWER GND
POWER GND

9

NC

10

Dimensions: inches

Functional Block Diagram

CONTROL

STATUS

SIGNAL GND

ISOLATION/
CONTROL

ISOLATION/
STATUS

VOLTAGE

REGULATOR

LOGIC

O/V

U/V

CURRENT

LIMIT

CHARGE

PUMP

GATE

PROTECTION

OUTPUT

DETECTION

TEMP
SENSE

(POWER GND)

POWER
IN

OUTPUT

LOAD

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 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

05/16/01

PRELIMINARY DATA SHEET

53248

28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER

SPECIFICATIONS

25°C unless otherwise specified)

(@ T

C

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
Output High is V

, Output Low is +0.4 V (max) @ ICC = 10 mA (max)

CC

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

On-state Resistance, T
On-state Resistance, T
Minimum Output Voltage Drop (I
Power Dissipation at T

C

Power Output Leakage Through Load ...........................................................................................................................15 µA

Trip Reset Time ................................................................................................................................ Temperature Dependent

Body Diode Current Capacity .......................................................................................................................................... 10 A

Quiescent Current (@ No load) ...................................................................................................................................... 8 mA

= +40 VDC (max)

CC

@ 25°C (IL ≥ 5A) .....................................................................................................................35 m

j

@ 150°C (I

j

5A)....................................................................................................................70 m

≥

L

= 0.5A) ..................................................................................................................... 50 mV

L

= 25°C and Full Load.................................................................................................................. 4 W

Ω
Ω

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

=1A)

L

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 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

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
increase power dissipation in the pass element, which additionally causes a further increase in R
junction temperature approaches +150°C, drive to the pass element is decreased, causing V

to increase. When

DS

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* Overvoltage and Undervoltage Limits

Junction Temperature Min Typ Max Unit

Overvoltage +34 VDC to +43 VDC

-40°C 48 56 65 A Undervoltage +3.4 VDC to +5.0 VDC
+25°C 40 50 58 A Overvoltage hysteresis Typical +1.0 VDC
+150°C 31 37 45 A Undervoltage hysteresis Typical +0.5 VDC

= –40°C to +150°C)

(T

j

*

Peak Duration - Typical Waveform

DS(ON)

DS(ON)

causing

. As

Short Circuit Protection:

Short-While-On Peak Duration @ 25°C

70

60

50

40

30

20

Output Current (A

10

0

-10

-20 0 20 40 60 80 100

Time (ms)

MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION • 905 E. Walnut St., Garland, TX 75040 • [phone] • Fax [phone]

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.

www.micropac.com E-MAIL: [e-mail]

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
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

of the SSPC, the unit heating will also be much less. Under

DS

I

= {(T

trip

T

j max

T

a

j max

– Ta)/[R

θja

][R

ON (Tj max)

= Maximum Trip Temperature

= Ambient Temperature

1/2

]}

R

θja

R

ON

(Tj max)

= Thermal Resistance, Junction to Ambient

= On-state resistance at Trip Temperature

On-state Resistance

RON(T)

= {(

Y2 – Y

T2 + (300)(Y2 – Y

)

1

(67500)Y1 – (8125)Y2} / 59375

)T +

1

Y1 = RON at +25°C

= R

Y

2

T = T

at +150°C

ON

at temperature of interest in °C

j

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 • 905 E. Walnut St., Garland, TX 75040 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

05/16/01

PRELIMINARY DATA SHEET

53248

28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER

Truth Table

Control Output Status

Normal Operation L

H

Current Limitation L

H

Short circuit to Power Ground L

H

Over-Temperature L

H

Short circuit to Power In L

H

Undervoltage L

H

Overvoltage L

H

L

H

L

H

L
L
L

L

H
H

L
L

L
L

Note: L = “Low” Level
H = “High” Level
** Status output will cycle between H and L while SSPC is in auto-reset mode.

Loads

The 53248 SSPC is designed to handle low side loads from +5 VDC

to +33 VDC. Any combination of inductive,

resistive and capacitive may be used. This includes lamps and DC motors.

H
L

H
**

H
**

H
**

L
L

H
H

H
H

Inductive loads require protecting the SSPC from voltage transients as pointed out in the precaution section above.
Charging Capacitive loads is generally not
capacitive loads, the user must assure that junction temperatures are not exceeded and at turn off if the V

a problem due to the auto-reset feature of the current limit function. For

drops

CC

below the voltage charge on the capacitor, any current will flow through the body diode of the FET switch. Since this
is a normal PN junction, the power dissipated for a given current can be many times that of the forward current
through the FET.
Incandescent lamps must be treated much like capacitive loads in that in-rush currents at turn-on can cause an
overcurrent condition.

DC motors must be treated like capacitive loads because in-rush currents can be very high. Should a machine
continue to rotate after power is removed, reverse currents due to back EMF need to be addressed.

Heatsinking

The SSPC is designed to take advantage of the relationship between junction temperatures and heat sink thermal
impedance. As described in the section discussing current trip characteristics, the thermal impedance of the heat sink
utilized can determine the magnitude of over current or short circuit current expected in a system.

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 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

05/16/01

PRELIMINARY DATA SHEET

53248

28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER

Offset voltage

The Power MOSFETs used in Micropac’s SSPC have very low on resistance and therefore low power dissipation.
Typical on-state resistance at 25°C is only 27 mΩ. Due to internal design the typical V
relatively constant until the current reaches approximately 2 amperes when V
R

is constant at Tj of +25°C. Maximum RDS at +150°C is 70 mΩ.

DS

is 60 mV. For higher currents, the

DS

Since the design of SSPC current limit is temperature dependent, there is no need for a current sensing resistor and
therefore no additional voltage drop which would add to the R

DS

.

Isolation of Control and Status

The SSPC was designed to utilize optical isolation both on the input/control and the status feed back. The only input
power required is that necessary to drive a control LED and provide pull up power for the open collector status
transistor. The SSPC derives its energy for operation from the 28 VDC load supply. As a result, the power in and
power out are completely isolated.

at 0.5 A is 50 mV. This stays

DS

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 • [phone] • Fax [phone]

www.micropac.com E-MAIL: [e-mail]

05/16/01