Application Note BTS50060-1TEA External Circuitry

Application Note
High current PROFET™
BT S50 060 -1T EA
E xa mpl e f or e xter na l c irc uit r y
Applic atio n N ote
V1.1 2014-01-29
Aut o moti ve P ow er
BTS50060-1TEA
Revision History
BTS50060-1TEA
Revision History: V1.1, 2014-01-29
Previous Version: V1.0, 2013-07-19
Page
Subjects (major changes since last revision)
6, 7, 9
Table 4, Table 5, Table 6: BCR133S replaced by BCR10PN
Application Note
2
V1.1, 2014-01-29
BTS50060-1TEA
Table of Contents
Table of Contents
1
Abstract ............................................................................................................................................... 4
2
Introduction ........................................................................................................................................ 4
3
Basic circuitry..................................................................................................................................... 4
4
Circuitry for applications requiring accurate load current sensing ............................................. 5
5
Circuitry for applications sensitive to shift of voltage levels / increased RF robustness of IS
signal ................................................................................................................................................... 5
6
Circuitry with “open load at OFF” detection ................................................................................... 6
7
Summary of circuitry for single device ............................................................................................ 7
8
Multiple devices.................................................................................................................................. 8
9
Conclusion ........................................................................................................................................ 10
10
Additional Information ..................................................................................................................... 10
Application Note
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V1.1, 2014-01-29
BTS50060-1TEA
Abstract
1
Abstract
Note: The following information is given as a hint for the implementation of the device only and shall not be
regarded as a description or warranty of a certain functionality, condition or quality of the device.
This application note is intended to give examples for external circuitry for using Infineon® product BTS500601TEA.
2
Introduction
Within high current PROFET™ product family, Infineon® offers the BTS50060-1TEA, which is a 6mOhm single
channel smart high-side switch. With it’s unique feature set, it serves a wide range of automotive heating
applications, such as driver for glow plugs, PTC heater, or urea heater.
In this application note, the following abbreviations and symbols are used:
BOM
:
bill of material
DI/O
:
digital output pin of a microcontroller
ADC
:
ADC input pin of a microcontroller; ADC = analog-to-digital converter
RF
:
radio frequency
3
Basic circuitry
Using circuitry as shown in Figure 1 supports basic functionality of BTS50060-1TEA.
Figure 1
Example for using BTS50060-1TEA basic circuitry
Application Note
4
V1.1, 2014-01-29
BTS50060-1TEA
Circuitry for applications requiring accurate load current sensing
Table 1
BOM single device basic circuitry
Symbol
Value
Count
Comment
IC1
BTS50060-1TEA
1
Smart High-side switch
Microcontroller
e.g. TLE9832
1
-
R_Input
10k
1
-
R_sense
10k
1
-
R_IS
1k
1
-
C_Vbat
100nF
1
-
C_OUT
10nF
1
-
X
Power connectors
3
-
Power Load
e.g. Diesel glow plug
1
Loads to be driven
4
Circuitry for applications requiring accurate load current sensing
The ADVANCED SENSE feature of BTS50060-1TEA allows accurate sensing of the load current. To support
this accuracy under severe RF disturbances, it may be necessary to include a resistor R_GND (100R) in the
connection for pin 1 of BTS50060-1TEA. See Figure 2. This may cause a shift of voltage at the GND pin, which
influences voltage levels and hysteresis behavior for undervoltage lock-off, input voltage thresholds, open load
at off detection.
Note: All parameters in datasheet are given only in respect to device pins (if not mentioned differently). Voltage
drops on external components are not covered by the device specification.
Figure 2
Example for using BTS50060-1TEA basic circuitry with R_GND
Table 2
Change to BOM for robust IS signal
Symbol
Value
Count
Comment
R_GND
100 Ohm
1
-
5
Circuitry for applications sensitive to shift of voltage levels /
increased RF robustness of IS signal
The voltage drop across R_GND causes a shift of the voltage levels of the device, such as undervoltage
threshold, input threshold, or open load at OFF threshold. For applications which are sensitive to a shift of these
Application Note
5
V1.1, 2014-01-29
BTS50060-1TEA
Circuitry with “open load at OFF” detection
thresholds, it may be necessary to replace R_GND by a chip ferrite L_GND. This will further increase the
robustness of IS signal against RF disturbances, especially at low load currents. See Figure 3 for example.
Figure 3
Table 3
Example for using BTS50060-1TEA circuitry with chip ferrite
Change to BOM for chip ferrite
Symbol
Value
Count
Comment
R_GND
100 Ohm
0
Replaced by L_GND
L_GND
e.g. WE 74279205
1
[email protected]
6
Circuitry with “open load at OFF” detection
BTS50060-1TEA offers easy implementation of diagnosing open loat at OFF (e.g.: detecting broken load wire
without activating BTS50060-1TEA). An example for such implementation can be found in Figure 4. This
circuitry would allow short-to-battery as well as open load detection in OFF state.
Table 4
Change to BOM for “open load at OFF” detection
Symbol
Value
Count
Comment
T1
NPN bias transistor,
e.g. TR1 of BCR10PN
PNP bias transistor,
e.g. TR2 of BCR10PN
10k
1
-
1
-
T2
RL_OL
Application Note
6
V1.1, 2014-01-29
BTS50060-1TEA
Summary of circuitry for single device
7
Summary of circuitry for single device
Figure 4
Example for using BTS50060-1TEA, summarizing above circuitry
Table 5
BOM single device
Symbol
Value
Count
Comment
IC1
BTS50060-1TEA
1
Smart High-side switch
Microcontroller
e.g. TLE9832
1
-
R_Input
10k
1
-
R_sense
10k
1
-
R_IS
1k
1
-
R_GND
100 Ohm
1
-
C_Vbat
100nF
1
-
C_OUT
10nF
1
-
X
Power connectors
3
-
Power Load
e.g. Diesel glow plug
1
Loads to be driven
T1
NPN bias transistor,
e.g. TR1 of BCR10PN
PNP bias transistor,
e.g. TR2 of BCR10PN
1
For open load detection
10k
1
For open load detection
T2
RL_OL
Application Note
7
V1.1, 2014-01-29
BTS50060-1TEA
Multiple devices
8
Multiple devices
Using multiple BTS50060-1TEA for independent outputs on a single board, some parts of the circuitry may be
necessary only one time, saving components and microcontroller pins. An example for using 2 units BTS500601TEA, with open load detection, can be found in Figure 5.
Figure 5
Example for using two BTS50060-1TEA, re-using circuitry and microcontroller pins
Application Note
8
V1.1, 2014-01-29
BTS50060-1TEA
Multiple devices
Table 6
BOM for two devices, including “open load at OFF” detection
Symbol
Value
Count
Comment
IC1
BTS50060-1TEA
2
Smart High-side switch
Microcontroller
e.g. TLE9832
1
-
R_Input
10k
2
-
R_sense
10k
2
-
R_IS
1k
2
-
R_GND
100 Ohm
2
-
C_Vbat
100nF
1
-
C_OUT
10nF
1
-
X
Power connectors
4
-
Power Load
e.g. Diesel glow plug
2
Loads to be driven
T1
NPN bias transistor,
e.g. TR1 of BCR10PN
1
For open load detection
T2
RL_OL
PNP bias transistor,
e.g. TR2 of BCR10PN
10k
2
For “open load at OFF”
D1
e.g. BAW56
1
For “open load at OFF”;
double diode with
common anode
As shown in Figure 6, instead of using a separate R_GND for each BTS50060-1TEA, using one common
L_GND for multiple BTS50060-1TEA may reduce the number of device count on board. Care has to be taken in
board layout to avoid RF coupling from BTS50060-1TEA pin 1 (GND) to module board, bypassing L_GND.
Using single R_GND for multiple BTS50060-1TEA is not recommended because of voltage drop across
R_GND.
Figure 6
Example for using two BTS50060-1TEA, re-using circuitry and microcontroller pins, with
single L_GND
Application Note
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V1.1, 2014-01-29
BTS50060-1TEA
Conclusion
Table 7
Change to BOM for two devices when using single L_GND
Symbol
Value
Count
Comment
R_GND
100 Ohm
0
Replaced by L_GND
L_GND
e.g. WE 74279205
1
[email protected]
9
Conclusion
The high current PROFET™ BTS50060-1TEA from Infineon® is a smart high-side switch. It offers the high
driving capability of a 6mOhm switch in a DPak package with a high number of protection and diagnostic
features. It supports high feature set and low count of external components, for a high variety of applications.
Examples of how to make use of that in application design were given in this application note.
10



Additional Information
Data sheet of BTS50060-1TEA can be found at http://www.infineon.com/PROFET
More information on ADVANCED SENSE feature can be found in the application note “ADVANCED SENSE
calibration and benefits guide” available at document section of http://www.infineon.com/PROFET
For further information you may contact http://www.infineon.com
Application Note
10
V1.1, 2014-01-29
Edition 2014-01-29
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2014 Infineon Technologies AG
All Rights Reserved.
LEGAL DISCLAIMER
THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE
IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE
REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR
QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION
NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON
TECHNOLOGIES HEREBY DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND
(INCLUDING WITHOUT LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN
THIS APPLICATION NOTE.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
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