BTM7745G Datasheet, PDF (13/24 Pages) Infineon Technologies AG – High Current H-Bridge Trilith IC 3G

High Current H-Bridge
BTM7745G
Block Description and Characteristics
6.2.3 Power Stages - Dynamic Characteristics
V_S = 13.5V, T_j = +150 °C,R_Load = 12 Ω, V_INH = 5V, VS pins shorted, all voltages with respect to ground, positive
current flowing into pin (unless otherwise specified)
Pos. Parameter
Symbol Limit Values
Unit Test Conditions
Min. Typ. Max.
High Side Switch Dynamic Characteristics
6.2.7 Rise-time of HS
t_r(HS)
5
6.2.8 Slew rate HS on
ΔV_OUT/
–
t_{r( HS)}
6.2.9 Switch on delay time HS
t_dr(HS)
50
6.2.10 Fall-time of HS
t_f(HS)
5
6.2.11 Slew rate HS off
-ΔV_OUT/
–
t_f(HS)
6.2.12 Switch off delay time HS
t_df(HS)
25
Low Side Switch Dynamic Characteristics
15
25
0.4 –
µs
–
V/µs –
95
140 µs
–
15
25
µs
–
0.4 –
V/µs –
55
80
µs
–
6.2.13 Rise-time of LS
6.2.14 Slew rate LS switch off
6.2.15
6.2.16
6.2.17
Switch off delay time LS
Fall-time of LS
Slew rate LS switch on
6.2.18 Switch on delay time LS
t_r(LS)
10
ΔV_OUT/
–
t_r(LS)
t_dr(LS)
30
t_f(LS)
10
-ΔV_OUT/
–
t_f(LS)
t_df(LS)
40
20
30
0.4 –
µs
–
V/µs –
60
90
20
30
0.4 –
µs
–
µs
–
V/µs –
80
120 µs
–
6.3
Protection Functions
The device provides integrated protection functions. These are designed to prevent IC destruction under fault
conditions described in the data sheet. Fault conditions are considered as “outside” normal operating range.
Protection functions are not to be used for continuous or repetitive operation, with the exception of the current
limitation (Chapter 6.3.4). Overvoltage, overtemperature and overcurrent are indicated by switching the open
drain output ST to low. Although the slew rate is defined as above (Chapter 6.2.3), in case of overvoltage and
overcurrent the device will have a higher slew rate of typically 11V/µs.
In the following the protection functions are listed in order of their priority. Overvoltage lock out overrides all other
error modes.
6.3.1 Overvoltage Lock Out
To assure a high immunity against overvoltages (e.g. load dump conditions) the device shuts both lowside
MOSFETs off and turns both highside MOSFET on, if the supply voltage V_S is exceeding the over voltage
protection level V_OV(OFF). The IC operates in normal mode again with a hysteresis V_OV(HY) if the supply voltage
decreases below the switch-on voltage V_OV(ON). This behavior of the BTM7745G will lead to freewheeling in
highside during over voltage.
Data Sheet
13
Rev. 1.0, 2010-05-28