TMC248-LA DATASHEET (Rev. 1.01 / 2013-MAR-26)
36
14.3 AC Specifications
AC characteristics contain the spread of values guaranteed within the specified supply voltage and
temperature range unless otherwise specified. Typical characteristics represent the average value of all
parts.
Logic supply voltage: VCC = 3.3 V,
Ambient temperature: TA = 27 °C,
Bridge supply voltage: VS = 14.0 V,
External MOSFET gate charge = 3.2 nC
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
kHz
Oscillator frequency
fOSC
20
25
31
COSC = 1nF 1%
using internal oscillator
Effective Blank time
TBL
BL1, BL2 = VCC
1.35
1.5
0.7
1.65
µs
µs
Minimum PWM on-time
TONMIN
BL1, BL2 = GND
14.4 Thermal Protection
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Thermal shutdown
TJOT hysteresis
TJOT
TJOTHYS
TJWT
145
155
15
165
°C
°C
°C
°C
Prewarning temperature
TJWT hysteresis
135
145
15
155
TJWTHYS
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