MC33486ADH Freescale Semiconductor, MC33486ADH Datasheet - Page 12

• Manufacturer Part Number: MC33486ADH
• Description: IC SWITCH DUAL H-SIDE 20-HSOP
• Manufacturer: Freescale Semiconductor

Specifications of MC33486ADH

• Applications: DC Motor Controller, H Bridge
• Number Of Outputs: 1
• Current - Output: 10A
• Voltage - Supply: 8 V ~ 28 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-HSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -

Thermal Model
mounted on a printed circuit board can be spit into two main
parts: junction-to-case and case-to-ambient resistances.
The use of this model is similar to the electrical Ohm law
(voltage = resistance x current), where:
12
33486A
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
(1.0 A = 1.0 W of
Power Dissipation)
The junction-to-ambient thermal resistance of the circuit
Figure 8
•Voltage represents temperature.
•Current represents power dissipated by the device.
•Resistance represents thermal resistance.
We finally have:
Temperature or delta temperature = power dissipation
times thermal resistance; that is, ° C = W x °C/W.
Power (W)
shows a simplified steady state model.
Figure 8. Simplified Thermal Model
(Electrical Equivalent)
R
θJC
Switch
(1.0 Ω = 1.0°C/W)
Ambient Temperature Node
(1.0 V = 1.0°C Ambient Temperature)
Case Temperature Node
Junction Temperature Node
Surface Temperature)
(Volts represent Die
R
θCA
the amount of power flowing through the thermal resistances.
Example
temperature is 85 ° C + 55 ° C = 140 ° C.
ambient thermal resistance, assuming that ambient
temperature is 85 ° C.
are located inside a module, the ambient temperature of the
module should be taken into account. Or an additional
thermal resistance from inside module to external ambient
temperature must be added. The calculation method remains
the same.
package. Junction-to-case thermal resistance is
approximately 2/0 ° C/W. The junction-to-ambient thermal
resistance follows the same rules as for the high-side block
and is in the same range.
1. Numerical Value
2. Results
Any node temperature can easily be calculated knowing
Assuming an 85 ° C ambient temperature, the junction
The above example takes into account the junction-to-
In the case where the device plus its printed circuit board
The low-side block is packaged into D
•Junction-to-case thermal resistance (R
•Power into the switch: Assuming the device is driving
•Case-to-ambient thermal resistance (R
•Junction-to-case delta temperature: 5.0 ° C (2.5 W x
•Case delta temperature from ambient: 50 ° C (20 ° C/W x
•Actual junction temperature node will be:
8.0 A at 150 ° C junction temperature (R
150 ° C is 40 m Ω ), the total power dissipation is 0.04 *
8 * 8 = 2.56 W
2.0 ° C/W)
2.5 W)
50 ° C + 5.0 ° C = 55 ° C above the ambient
temperature.
Analog Integrated Circuit Device Data
Freescale Semiconductor
2
PAK or DPAK
θJC
θCA
DS(ON)
): 2.0 ° C/W
): 20 ° C/W
at