THMC40, THMC41

VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS

SLIS097 – MARCH 2000

5

POST OFFICE BOX 655303

dc

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

IIB(PWM)

VPWM input bias current

VPWM = 0 V to 3 V

±1

µA

VPWM (100%)

VPWM voltage equivalent to 100% duty cycle

2.3

V

VSLEEP

VPWM voltage threshold to engage sleep mode

0.6

0.7

V

VSTART

VPWM voltage threshold to disengage sleep

mode

0.8

0.9

V

thermal shutdown characteristics

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

TTSD

VOUT, PHA, PHB global thermal shutdown

thresholds

Temperature increasing until outputs are off,

See Note 6

150

185

°C

THYST

Thermal shutdown hysteresis

After TTSD, temperature decreasing until out-

puts return to normal operation, See Note 6

15

°C

TACH Tachometer open-drain output (THMC40)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

ITACHLEAK

TACH high-level output leakage current

VTACH = 5 V

0.1

1

µA

VOL

TACH low-level output voltage

ITACH = 5 mA

0.1

0.3

V

RD locked rotor detection open-drain output (THMC41)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

IRDLEAK

RD high-level output leakage current

VRD = 5 V, Locked rotor condition

0.1

1

µA

VOL

RD low-level output voltage

IRD = 5 mA, No locked rotor

0.1

0.3

V

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

fPWM

High-side gate drive PWM frequency

COSC = 2200 pF

22.7

kHz

tRD

Locked rotor detect delay time

COSC = 2200 pF See Figure 9

1

s

tRETRY

Auto-restart delay time

COSC = 2200 pF, See Figure 9

8

s

tHALL

Hall zero-crossing deglitch time

See Figure 2

25

µs

tDEAD(PHx) Dead time between phase commutations

See Figure 2

5

µs

tf(OUT)

VOUT output fall time

25

ns

tr(OUT)

VOUT output rise time

RL = 20 Ω , LL = 5 mH,

25

ns

tf(PHx)

PHA or PHB fall time

L

, L

,

See Note 6

1

µs

tr(PHx)

PHA or PHB rise time

1

µs

NOTE 6: Design targets only. Not tested in production.