BTS621L1 Datasheet, PDF (12/14 Pages) Siemens Semiconductor Group – Smart Two Channel Highside Power Switch (Overload protection Current limitation Short circuit protection Thermal shutdown)

Figure 4a: Overtemperature:
Reset if T_j <T_jt
IN
ST
BTS 621 L1
Figure 5b: Open load: detection in ON-state, turn
on/off to open load
IN1
IN2 channel 2: normal operation
V
OUT1
V
OUT
I
L1
channel 1: open load
T
t
d(ST)
t
d(ST OL4)
t
d(ST)
t
d(ST OL5)
J
ST
t
t
Figure 5a: Open load: detection in ON-state, open
load occurs in on-state
IN1
IN2 channel 2: normal operation
V_OUT1
Figure 5c: Open load: detection in ON- and OFF-state
(with REXT), turn on/off to open load
IN1
IN2 channel 2: normal operation
V
OUT1
I_L1
channel 1:
open
load
normal
load
open
load
t _{d(ST OL1) t d(ST OL2)}
ST
t _{d(ST OL1)}
t _{d(ST OL2)}
t
td(ST OL1) = 30 µs typ., td(ST OL2) = 20 µs typ
I _L1
channel 1: open load
ST
t _d(ST)
t
d(ST)
t _{d(ST OL5)}
t
t_{d(ST OL5)} depends on external circuitry because of high
impedance
Semiconductor Group
12