L9942 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
L9942 Datasheet PDF : 40 Pages
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Electrical specifications
L9942
3.4.4 Charge pump output
Table 11. Charge pump output
Symbol
Parameter
Test condition
Min. Typ. Max. Unit
VS=7 V
ICP= -100 A, all
11
-
20
V
VCP Charge pump output voltage VS=13.5 V switches off at
20
-
35
V
VS=20 V
Qxn
30
-
40
V
The ripple of voltage at CP can suppressed using a capacity of e.g.100 nF.
3.4.5
Outputs: Qxn (x = A; B n = 1; 2)
The comparator, which is monitoring current image of HS, is working during ON cycle of
PWM control. If load current is higher as set value then the signal ILIMIT is generated and
after filter time the bridge is switched off. Test mode gets access to signal ILIMIT and
threshold of current can be measured.
Table 12. Outputs: Qxn (x = A; B n =1; 2)
Symbol
Parameter
Test condition
Min.
VS = 13.5 V, Tj = 25 °C,
-
IQxn = -1.0 A
RDSON HS
On-resistance Qxn to VS
VS = 13.5 V, Tj = 125 °C,
IQxn = -1.0 A
-
VS = 7.0 V, Tj = 25 °C,
-
IQxn = -1.0 A
VS = 13.5 V, Tj = 25 °C,
-
IQxn = + 1.0 A
RDSON LS
On-resistance Qxn to
PGND
VS = 13.5 V, Tj = 125 °C,
IQxn = + 1.0 A
-
VS = 7.0 V, Tj = 25 °C,
-
IQxn = + 1.0 A
|IQxnOC |
Output overcurrent
test mode exclusive of filter
limitation to VS or PGND time 4µs (Chapter 2.10)
1.6
Bits: DC2 DC1 DC0=000
60
Bits: DC2 DC1 DC0=001
100
Value of output current to Bits: DC2 DC1 DC0=010
180
IQxnFS_HS
supply VS (so called full
scale value)1 sourcing
Bits: DC2 DC1 DC0=011
Bits: DC2 DC1 DC0=100
300
485
from HS switch
Bits: DC2 DC1 DC0=101
720
IQxnLIM_HS
Accuracy of micro steps
current limit
Bits: DC2 DC1 DC0=110
Bits: DC2 DC1 DC0=111
-
1000
1200
MIN(1)
1. MIN= 0.92 · IQxnLIM – 0.02 · |IQxnFS_HS |; MAX= 1.08 · IQxnLIM + 0.02 · |IQxnFS_HS |
Typ.
500
750
550
500
750
550
2
95
140
230
360
550
810
1150
1350
-
Max.
700
Unit
m
1000
m
750
m
700
m
1000
m
750
m
-
A
130
180
280
420
mA
615
900
1300
1500
MAX(1)
mA
18/40
Doc ID 11778 Rev 7
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