BTN8962 datasheet(16/94 Pages) INFINEON

部品番号	BTN8962

部品情報	High Current PN Half Bridge

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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

SGND

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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