THMC40 Datasheet, PDF (5/17 Pages) Texas Instruments – VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS

THMC40, THMC41
VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS
SLIS097 – MARCH 2000
dc electrical characteristics, V_PWR = 12 V, T_A = –30°C to 80°C (unless otherwise noted) (continued)
V_PWM high-side PWM duty cycle adjust input
PARAMETER
IIB(PWM)
VPWM (100%)
VSLEEP
VSTART
VPWM input bias current
VPWM voltage equivalent to 100% duty cycle
VPWM voltage threshold to engage sleep mode
VPWM voltage threshold to disengage sleep
mode
TEST CONDITIONS
VPWM = 0 V to 3 V
MIN TYP MAX UNITS
±1 µA
2.3
V
0.6 0.7
V
0.8 0.9 V
thermal shutdown characteristics
PARAMETER
TTSD
VOUT, PHA, PHB global thermal shutdown
thresholds
THYST Thermal shutdown hysteresis
TEST CONDITIONS
Temperature increasing until outputs are off,
See Note 6
After TTSD, temperature decreasing until out-
puts return to normal operation, See Note 6
MIN TYP MAX UNITS
150
185 °C
15
°C
TACH Tachometer open-drain output (THMC40)
PARAMETER
ITACHLEAK TACH high-level output leakage current
VOL
TACH low-level output voltage
TEST CONDITIONS
VTACH = 5 V
ITACH = 5 mA
RD locked rotor detection open-drain output (THMC41)
PARAMETER
TEST CONDITIONS
IRDLEAK RD high-level output leakage current
VOL
RD low-level output voltage
VRD = 5 V, Locked rotor condition
IRD = 5 mA, No locked rotor
MIN TYP MAX UNITS
0.1
1 µA
0.1 0.3 V
MIN TYP MAX UNITS
0.1
1 µA
0.1 0.3 V
ac electrical characteristics, V_PWR = 12 V, T_A = –30°C to 80°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX
fPWM
High-side gate drive PWM frequency
COSC = 2200 pF
22.7
tRD
tRETRY
Locked rotor detect delay time
Auto-restart delay time
1
COSC = 2200 pF, See Figure 9
8
tHALL
Hall zero-crossing deglitch time
See Figure 2
25
tDEAD(PHx) Dead time between phase commutations
5
tf(OUT)
VOUT output fall time
25
tr(OUT)
tf(PHx)
VOUT output rise time
PHA or PHB fall time
RL = 20 Ω , LL = 5 mH,
25
See Note 6
1
tr(PHx)
PHA or PHB rise time
1
NOTE 6: Design targets only. Not tested in production.
UNITS
kHz
s
s
µs
µs
ns
ns
µs
µs
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