UM1693 datasheet(3/196 Pages) STMICROELECTRONICS

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UM1693 Datasheet(PDF) 3 Page - STMicroelectronics

Part #	UM1693

Description	M0-7 standard high-side drivers hardware design guide

Download	196 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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UM1693

Contents

Usage and handling of MultiSense SEL pin

. . . . . . . . . . . . . . . . . . . . 57

5.1

Classification of M0-7 HSDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

5.2

SEL pins truth table (device dependant) . . . . . . . . . . . . . . . . . . . . . . . . . 58

5.3

Connection of SEL pins with control logic (Microcontroller) . . . . . . . . . . . 59

Load compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.1

Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6.2

Power loss calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

6.2.1

Conduction losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

6.2.2

Switching losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

6.3

Inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

6.3.1

Turn-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

6.3.2

Turn-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

6.3.3

Calculation of dissipated energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

6.3.4

Selection criterion with reference to I-L plot . . . . . . . . . . . . . . . . . . . . . . 99

6.3.5

External clamping protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

6.3.6

Loss of VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

MultiSense - analogue current sense . . . . . . . . . . . . . . . . . . . . . . . . . 117

7.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117

7.2

Principle of MultiSense signal generation . . . . . . . . . . . . . . . . . . . . . . . .118

7.2.1

Current monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

7.2.2

Normal operation (channel ON, no fault, SEn active) . . . . . . . . . . . . . 119

7.2.3

Current monitoring range of linear operation . . . . . . . . . . . . . . . . . . . . 119

7.2.4

Impact of the output voltage to the MultiSense output . . . . . . . . . . . . . 122

7.2.5

Failure flag indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

7.2.6

Considerations on MultiSense resistor choice for current monitor . . . 124

7.2.7

Usage when multiplexing several devices . . . . . . . . . . . . . . . . . . . . . . 127

7.2.8

LED diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

7.2.9

Diagnostic with paralleled loads / partial load detection . . . . . . . . . . . 130

7.2.10

K factor calibration method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

7.2.11

Open load detection in off-state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

7.2.12

MultiSense diagnostic evaluation with SPC560Bxx . . . . . . . . . . . . . . . 142

7.2.13

MultiSense low pass filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

7.3

TCASE, VCC (device dependent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

7.3.1

VCC monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

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