Datasheet

Electrical specifications L9942
18/40 Doc ID 11778 Rev 7
3.4.4 Charge pump output
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 11. Charge pump output
Symbol Parameter Test condition Min. Typ. Max. Unit
V
CP
Charge pump output voltage
V
S
=7 V
I
CP
= -100 A, all
switches off at
Qxn
11 - 20 V
V
S
=13.5 V 20 - 35 V
V
S
=20 V 30 - 40 V
Table 12. Outputs: Qxn (x = A; B n =1; 2)
Symbol Parameter Test condition Min. Typ. Max. Unit
R
DSON HS
On-resistance Qxn to V
S
V
S
= 13.5 V, T
j
= 25 °C,
I
Qxn
= -1.0 A
- 500 700 m
V
S
= 13.5 V, T
j
= 125 °C,
I
Qxn
= -1.0 A
- 750 1000 m
V
S
= 7.0 V, T
j
= 25 °C,
I
Qxn
= -1.0 A
- 550 750 m
R
DSON LS
On-resistance Qxn to
PGND
V
S
= 13.5 V, T
j
= 25 °C,
I
Qxn
= + 1.0 A
- 500 700 m
V
S
= 13.5 V, T
j
= 125 °C,
I
Qxn
= + 1.0 A
- 750 1000 m
V
S
= 7.0 V, T
j
= 25 °C,
I
Qxn
= + 1.0 A
- 550 750 m
|I
QxnOC
|
Output overcurrent
limitation to VS or PGND
test mode exclusive of filter
time 4µs (Chapter 2.10)
1.6 2 - A
I
QxnFS_HS
Value of output current to
supply V
S
(so called full
scale value)1 sourcing
from HS switch
Bits: DC2 DC1 DC0=000 60 95 130
mA
Bits: DC2 DC1 DC0=001 100 140 180
Bits: DC2 DC1 DC0=010 180 230 280
Bits: DC2 DC1 DC0=011 300 360 420
Bits: DC2 DC1 DC0=100 485 550 615
Bits: DC2 DC1 DC0=101 720 810 900
Bits: DC2 DC1 DC0=110 1000 1150 1300
Bits: DC2 DC1 DC0=111 1200 1350 1500
I
QxnLIM_HS
Accuracy of micro steps
current limit
-MIN
(1)
-MAX
(1)
mA
1. MIN= 0.92 · I
QxnLIM
– 0.02 · |I
QxnFS_HS
|; MAX= 1.08 · I
QxnLIM
+ 0.02 · |I
QxnFS_HS
|