參數(shù)資料
型號: L9942XPTR
廠商: STMICROELECTRONICS
元件分類: 運動控制電子
英文描述: STEPPER MOTOR CONTROLLER, 2.5 A, PDSO24
封裝: LEAD FREE, POWER, SSO-24
文件頁數(shù): 13/40頁
文件大小: 664K
代理商: L9942XPTR
Electrical specifications
L9942
3.4.6
PWM Control
Figure 8.
Switching on Minimum Time
Table 12.
PWM Control (see Figure 4 and Figure 7)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
fPWM
(1)
Frequency of PWM cycles
Bit: FRE= 1
20.8
kHz
Bit: FRE= 0
31.3
kHz
TMD
(1)
Mixed decay switch off delay time
Bits: DM1 DM0= 0 1
4
s
Bits: DM1 DM0= 1 0
8
s
TFT
(1)
Glitch filter delay time
Bit: FILTER= 0
1.5
s
Bit: FILTER= 1
2.5
s
Tcc
(1)
TB
(1)
Cross current protection time Blank
time of comparator
Bits: SR1 SR0= 0 0
0.5
s
Bits: SR1 SR0= 0 1
1
s
Bits: SR1 SR0= 1 0
2
s
Bits: SR1 SR0= 1 1
4
s
VSR
Slew rate (dV/dt 30%-70%) @HS
switches on resistive load of 10
Ω,
VS=13.5V
Bits: SR1 SR0= 0 0
13
V/s
Bits: SR1 SR0= 0 1
13
V/s
Bits: SR1 SR0= 1 0
6
V/s
Bits: SR1 SR0= 1 1
6
V/s
1.
This parameter is guaranteed by design.
Time base is an internal trimmed oscillator of typical 2MHz and it has an accuracy of ±6% .
Internal PWM
clock
20 or 30 kHz
decay
on
Load current
at Qxn
Step limit
T
B
Blank time of current comparator
TCC
T FT
Time
Cross current protection time
CC
T
TCC
T
PWM
TB
T
FT
Filter time of current comparator
Pin PWM
(for bridge A)
TINT _2MHz
e.g. T
B = TCC
T
FT = 1.5 us
= 1 us
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