UM1557 datasheet(3/111 Pages) STMICROELECTRONICS

3 / 111 page

UM1557

Contents

Doc ID 023521 Rev 2

3/111

4.4.3

Example of VND5T035AJ for DC motor driving with external clamp . . . 54

Paralleling of HSDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

5.1

Paralleling of FR_Stby (fault reset/standby) or IN (input) . . . . . . . . . . . . . 61

5.1.1

Monolithic HSDs supplied from different supply lines . . . . . . . . . . . . . . 61

5.1.2

Hybrid HSDs supplied from different supply lines . . . . . . . . . . . . . . . . . 63

5.1.3

Mix of monolithic and hybrid HSDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

5.2

Paralleling of CS pins (current sense) . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

5.2.1

Monolithic HSDs supplied from different supply lines . . . . . . . . . . . . . . 65

5.2.2

Hybrid HSDs supplied from different supply lines . . . . . . . . . . . . . . . . . 67

5.2.3

Mix of monolithic and hybrid HSDs supplied from different supply lines 68

5.3

Paralleling of outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

6.1

ESD protection of HSD – calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

6.2

ESD protection – ECU level (layout consideration) . . . . . . . . . . . . . . . . . 74

Robust design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

7.1

Design suggestions for HSDs and relays on the same PCB . . . . . . . . . . 75

Operation with AMICO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

8.1

Introduction on AMICO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

8.2

Control and diagnostic function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

8.2.1

PWM control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

8.2.2

HSD control in normal conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

8.2.3

HSD control in limp home mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

8.2.4

Diagnostic principle of the HSDs by the AMICO . . . . . . . . . . . . . . . . . . 80

8.3

Load compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

8.3.1

Inrush blanking time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

8.3.2

Overload and open load detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

8.4

Combining inrush blanking time and diagnostic of open load in off-state

8.4.1

Description of the principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

8.5

Direct current sense reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

8.6

Impact on the accuracy of the current sense reading . . . . . . . . . . . . . . . 94

8.7

Functional safety aspects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

8.7.1

Limp home mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

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