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BTN8962 データシート(PDF) 16 Page - Infineon Technologies AG

部品番号 BTN8962
部品情報  High Current PN Half Bridge
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メーカー  INFINEON [Infineon Technologies AG]
ホームページ  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

BTN8962 データシート(HTML) 16 Page - Infineon Technologies AG

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Microcontroller
C9
100nF
C10
470µF
R1
10k
R2
10k
CO 2V
220nF
INH
IN
IS
SR
VS
OUT
GND
BTN89xx
R11
0..51k
R12
1k
CIS
1nF
C2
100nF
I/O
I/O
I/O
SGND
SGND
PGND
PGND
Short connection to GND-pin
Signal ground domain
Power ground domain
SGND
PGND
GND
Figure 10 Simplified schematic illustrating the ground references for the signal ground (SGND) and
power ground (PGND) of the NovalithICTM
Design rules for the ground reference:
IS-pin: The reference ground for the current sense and failure flag detection is ideally the Analog-to-Digital
Converter’s / Microcontroller’s ground as the IS-pin is a current source. If this is implemented, the absolute
maximum ratings shall be respected, also in the case of a ground shift between the Microcontroller’s
(signal-) ground and the device’s ground (GND-pin). Thus it is recommended to connect R12 and C_IS to the
signal ground (SGND) as shown in Figure 10 thus eliminating the influence of a ground shift.
SR-pin: For the slew rate functionality the reference ground is the device’s ground, the GND-pin. Thus R11
and C2 (in Figure 5 and Figure 10) should be placed close to the device and be connected directly to the
device’s ground with minimal wiring to prevent any influence of disturbance through ground shifts.
IN/INH-pins: For the digital input pins IN and INH the internal ground reference is the GND-pin of the
NovalithIC™ thus it has to be obtained, that a ground shift between the Microcontroller’s (signal-) ground,
which is controlling the pins, and the device’s ground (GND-pin) isn’t influencing the switching behavior
and the absolute maximum ratings are respected.
3.4
Driving inductive loads over long wires
Inductive loads have a lowpass filter characteristic, like a motor. Because of this, the wire from the NovalithIC™
OUT to the motor injects electromagnetic disturbances into the OUT-pin. This antenna effect increases as the
length of the motor wire increases.
The definition of a long motor wire strongly depends on the application and the environment. To provide a
general idea, wire lengths of approximately 20 cm and more are considered as "long wire". The motor wire
should therefore be as short as possible.
3.4.1
PWM operation
In case of a long motor wire and PWM operation the electromagnetic emission (EME) increases with the wire
length and with the switching speed (inversion of tr(HS), tr(LS), tf(HS) and tf(LS)). In this case it is advantageous to
reduce the switching speed with the slew rate resistor at the SR-pin (see Figure 5, R11). Reducing the switching
speed has probably a impact on the PWM-frequency, which may needs to be adapted. In any case the power
dissipation and the cooling concept needs to be reviewed. The slew rate resistor at the SR-pin should not
exceed the max. slew rate resistor value of the data sheet RSR ≤ 51 kΩ.
BTN8960 /62 /80 /82
High Current PN Half Bridge
Design Guideline
Application Note
16
Rev. 0.6
2017-02-21


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