DRV8809

DRV8810

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

H-Bridge Drivers (OUTx+ and OUTx–)

Peak output current 1

Less than 500-ns period

8

A

Peak output current 2

Less than 100-ms period

3

A

Average continuous output

0.8

A

current

0.55

FET ON resistance at 0.8 A

Ω

1

Output leakage current

10

µA

Sense resistor supply current

nORT = Low

15

µA

Motor overcurrent threshold for

3

5

A

Motor overcurrent filter time

2.5

5

8.5

µs

Motor oscillator frequency

F_OSCM = (0,0)

720

800

880

kHz

Motor chopping frequency =

F_OSCM = (0,0)

90

100

110

kHz

Stepper Motor Drive (Parameters Are Tested Without Motor Loading)

Average stepper motor current

800

mA

for H-bridge

Peak stepper motor current

1.3

A

for H-bridge

100

100

98

96

92

88

83

77

Stepper motor current limit

threshold

71

%

63

56

47

38

29

20

10

0

Output current accuracy at 100% Excludes VREF and RSENS errors,

–5

5

%

(7) (8)

Switch (driver MOSFET) leakage

Outputs off

–10

10

µA

current

Stepper motor blanking time

By OSCi cycles

8

9

cycles

(6)

When the overcurrent is detected, all H-bridges are shut down and assert nORT pulse (40 ms).

(7)

This is not measured directly, checked by Itrip amplifier gain without motor loading

(8)

This device may show current setting error when motor current is less than 1 A, due to noise filter delay at the Itrip comparator.

10

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