DRV8428DYYR datasheet(8/53 Pages) TI1

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DRV8428

SLOSE54 – JUNE 2020

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Electrical Characteristics (continued)

Typical values are at TA = 25°C and VVM = 24 V. All limits are over recommended operating conditions, unless otherwise

noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

RDS(ONL)

Low-side FET on resistance

VVM = 24 V, TJ = 25 °C, IO = 0.5 A

750

900

Ω

VVM = 24 V, TJ = 125 °C, IO = 0.5 A

1130

1400

Ω

VVM = 24 V, TJ = 150 °C, IO = 0.5 A

1250

1590

Ω

tSR

Output slew rate

VVM = 24 V, IO = 0.5 A, Between 10% and

90%

240

V/µs

PWM CURRENT CONTROL (VREF)

Transimpedance gain

VREF = 3 V

2.85

3.15

V/A

tOFF

PWM off-time, mixed 30%

decay

DECAY/TOFF = 14.7 kΩ to GND

μs

DECAY/TOFF = 44.2 kΩ to GND

DECAY/TOFF = 100 kΩ to GND

PWM off-time, Smart tune

dynamic decay

DECAY/TOFF = 249 kΩ to GND

DECAY/TOFF = Hi-Z

DECAY/TOFF = Tied to DVDD

ΔITRIP

Current trip accuracy

IO = 1 A, 10% to 20% current setting

–15

IO = 1 A, 20% to 67% current setting

–10

IO = 1 A, 68% to 100% current setting

–5

IO,CH

AOUT and BOUT current

matching

IO = 1 A

–2.5

2.5

PROTECTION CIRCUITS

VUVLO

VM UVLO lockout

VM falling, UVLO falling

3.85

3.95

4.05

VM rising, UVLO rising

3.95

4.05

4.15

VUVLO,HYS

Undervoltage hysteresis

Rising to falling threshold

100

IOCP

Overcurrent protection

Current through any FET

1.7

tOCP

Overcurrent deglitch time

1.25

μs

TOTSD

Thermal shutdown

Die temperature TJ

150

165

180

°C

THYS_OTSD

Thermal shutdown hysteresis

Die temperature TJ

°C

(1)

STEP input can operate up to 500 kHz, but system bandwidth is limited by the motor load.

6.6 Indexer Timing Requirements

Typical limits are at TJ = 25°C and VVM = 24 V. Over recommended operating conditions unless otherwise noted.

NO.

MIN

MAX

UNIT

ƒSTEP

Step frequency

500(1)

kHz

tWH(STEP)

Pulse duration, STEP high

970

tWL(STEP)

Pulse duration, STEP low

970

tSU(DIR, Mx)

Setup time, DIR or MODEx to STEP rising

200

tH(DIR, Mx)

Hold time, DIR or MODEx to STEP rising

200

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