TMC249 / TMC249A DATA SHEET (V2.09 / 2009-Jul-30)
27
AC Characteristics
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 = 3.3V,
Ambient temperature: TA = 27°C,
Bridge supply voltage: VS = 14.0V,
External MOSFET gate charge = 3.2nC
Symbol Parameter
Conditions
Min
Typ
Max
Unit
fOSC
Oscillator frequency
using internal oscillator
Effective Blank time
COSC = 1nF
1%
20
25
31
kHz
TBL
BL1, BL2 = VCC
1.35
1.5
0.7
1.65
µs
µs
TONMIN Minimum PWM on-time
BL1, BL2 =
GND
Thermal Protection
Symbol Parameter
Conditions
Min
Typ
155
15
Max
Unit
°C
TJOT
Thermal shutdown
145
165
TJOTHYS TJOT hysteresis
°C
TJWT
Prewarning temperature
135
145
15
155
°C
TJWTHYS TJWT hysteresis
°C
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TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
