Smart High-Side Power Switch
BTS711L1
Inductive load switch-off energy
dissipation
( EE
( $6
,1
9EE
Typ. on-state resistance
521 I 9EE7M ; IL = 1.8 A, IN = high
(/RDG
RON [mOhm]
352)(7 287
67
*1'
/
^=/
(/
(5
5/
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)|)
OQ
(1+
IL·RL
|VOUT(CL)|
)
7M &
&
&
&
Vbb [V]
Maximum allowable load inductance for
a single switch off (one channel)5)
/ I ,/ Tj,start = 150°C, Vbb = 12 V, RL = 0 Ω
L [mH]
Typ. open load detection current
,/2/ I 9EE7M IN = high
IL(OL) [mA]
&
&
&
7M &
Vbb [V]
IL [A]
Data Sheet
11
Rev 1.2, 2010-03-16