10k

10k

0.1µF

µC

15

9 , 16

11

10

12

13

14

IN -

IN +

RDY

10k

10k

VCC1

0.1µF

GND1

2.25V-5.5V

10R

ISO 5852S ± Q1

µC

RST

FLT

15

9 , 16

11

10

12

13

14

10R

2.25V-5.5V

IN -

IN +

RDY

VCC1

GND1

RST

FLT

ISO 5852S ± Q1

Copyright © 2016, Texas Instruments

Incorporated

26

ISO5852S-Q1

SLLSEQ2A – SEPTEMBER 2016 – REVISED DECEMBER 2016

www.ti.com

Product Folder Links: ISO5852S-Q1

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Copyright © 2016, Texas Instruments Incorporated

10.2.2.3 Driving the Control Inputs

The amount of common-mode transient immunity (CMTI) can be curtailed by the capacitive coupling from the

high-voltage output circuit to the low-voltage input side of the ISO5852S-Q1 device. For maximum CMTI

performance, the digital control inputs, IN+ and IN–, must be actively driven by standard CMOS, push-pull drive

circuits. This type of low-impedance signal source provides active drive signals that prevent unwanted switching

of the ISO5852S-Q1 output under extreme common-mode transient conditions. Passive drive circuits, such as

open-drain configurations using pullup resistors, must be avoided. A 20-ns glitch filter exists that can filter a glitch

up to 20 ns on IN+ or IN–.

10.2.2.4 Local Shutdown and Reset

In applications with local shutdown and reset, the FLT output of each gate driver is polled separately, and the

individual reset lines are independently asserted low to reset the motor controller after a fault condition.

Figure 52. Local Shutdown and Reset for Noninverting (left) and Inverting Input Configuration (right)

10.2.2.5 Global-Shutdown and Reset

When configured for inverting operation, the ISO5852S-Q1 device can be configured to shutdown automatically

in the event of a fault condition by tying the FLT output to IN+. For high reliability drives, the open drain FLT

outputs of multiple ISO5852S-Q1 devices can be wired together forming a single, common fault bus for

interfacing directly to the microcontroller. When any of the six gate drivers of a three-phase inverter detects a

fault, the active-low FLT output disables all six gate drivers simultaneously.