L9942 Ver la hoja de datos (PDF) - STMicroelectronics
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L9942 Datasheet PDF : 40 Pages
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Electrical specifications
L9942
3.4.6 PWM control
Table 13. PWM control (see Figure 4 and Figure 7)
Symbol
Parameter
Test condition
Min.
Bit: FRE= 1
-
fPWM (1) Frequency of PWM cycles
Bit: FRE= 0
-
Bits: DM1 DM0= 0 1
-
TMD(1) Mixed decay switch off delay time
Bits: DM1 DM0= 1 0
-
Bit: FILTER= 0
-
TFT(1) Glitch filter delay time
Bit: FILTER= 1
-
Bits: SR1 SR0= 0 0
-
Tcc (1) Cross current protection time Blank Bits: SR1 SR0= 0 1
-
TB (1) time of comparator
Bits: SR1 SR0= 1 0
-
Bits: SR1 SR0= 1 1
-
Bits: SR1 SR0= 0 0
-
Slew rate (dV/dt 30 % - 70 %) @HS Bits: SR1 SR0= 0 1
-
VSR switches on resistive load of 10 ,
VS = 13.5 V
Bits: SR1 SR0= 1 0
-
Bits: SR1 SR0= 1 1
-
1. This parameter is guaranteed by design.
Time base is an internal trimmed oscillator of typical 2MHz and it has an accuracy of ±6 %.
Figure 8. Switching on minimum time
Typ.
20.8
31.3
4
8
1.5
2.5
0.5
1
2
4
13
13
6
6
Max.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Unit
kHz
kHz
µs
µs
µs
µs
µs
µs
µs
µs
V/µs
V/µs
V/µs
V/µs
Load current
at Qxn
T FT
T CC
Step limit
T FT Filter time of current comparator
T CC Cross current protection time
T B Blank time of current comparator
e.g. T B = TCC = 1 us TFT= 1.5 us
T CC
TB
Internal PWM
clock
20 or 30 kHz
on
TINT _2MHz
Pin PWM
(for bridge A)
TPWM
decay
Time
20/40
Doc ID 11778 Rev 7
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