Q67060-S6953A3 데이터 시트보기 (PDF) - Infineon Technologies
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Q67060-S6953A3 Datasheet PDF : 16 Pages
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Data Sheet BTS555
Inverse load current operation
Vbb
+
-
VIN
Vbb
- IL
IN PROFET OUT
IS
IIS
VIS
R IS
VOUT +
-
Maximum allowable load inductance for
a single switch off
L = f (IL ); Tj,start = 150°C, Vbb = 12 V, RL = 0 Ω
1000000
100000
10000
The device is specified for inverse load current
operation (VOUT > Vbb > 0V). The current sense feature
is not available during this kind of operation (IIS = 0).
With IIN = 0 (e.g. input open) only the intrinsic drain
source diode is conducting resulting in considerably
increased power dissipation. If the device is switched
on (VIN = 0), this power dissipation is decreased to the
much lower value RON(INV) * I2 (specifications see page
4).
Note: Temperature protection during inverse load
current operation is not possible!
1000
100
10
1
1
L [µH]
10
100
1000
Inductive load switch-off energy
dissipation
E bb
E AS
V bb
V bb
i L(t)
IN PROFET OUT
IS
L
I IN
RIS
{Z L RL
IL [A]
Externally adjustable current limit
ELoad
EL
ER
If the device is conducting, the sense current can be
used to reduce the short circuit current and allow
higher lead inductance (see diagram above). The
device will be turned off, if the threshold voltage of T2
is reached by IS*RIS . After a delay time defined by
RV*CV T1 will be reset. The device is turned on again,
the short circuit current is defined by IL(SC) and the
device is shut down after td(SC) with latch function.
Energy stored in load inductance:
EL = 1/2·L·I2L
While demagnetizing load inductance, the energy
dissipated in PROFET is
EAS= Ebb + EL - ER= VON(CL)·iL(t) dt,
with an approximate solution for RL > 0 Ω:
EAS= 2IL·R· LL(Vbb + |VOUT(CL)|)
ln
(1+
IL·RL
|VOUT(CL)|
)
Vbb
IN
Vbb
PROFET OUT
RV
IN
Signal
T1
Signal
GND
CV
T2
IS
Rload
R IS
Power
GND
Infineon Technologies AG
10
2003-Oct-01
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