TLE7184F3V Datasheet, PDF (13/36 Pages) Infineon Technologies AG – System IC for B6 motor drives

TLE7184F-3V
MOSFET Driver
5.3
Bootstrap Principle
The TLE7184F-3V provides a bootstrap based supply for its high side output stages. The benefit of this principle
is a fast switching of the high side switches - supporting active freewheeling in high side.
The bootstrap capacitors are charged by switching on the external low side MOSFETs connecting the bootstrap
capacitor to GND. Under this condition the bootstrap capacitor will be charged from the VREG capacitor. If the low
side MOSFET is switched off and the high side MOSFET is switched on, the bootstrap capacitor will float together
with the SHx voltage to the supply voltage of the bridge. Under this condition the supply current of the high side
output stage will discharge the bootstrap capacitor. This current is specified. The size of the capacitor together
with this current will determine how long the high side MOSFET can be kept on without recharging the bootstrap
capacitor.
When all external MOSFETs are switched off, the SHx voltage can be undefined. Under this condition, the
bootstrap capacitors can be discharged, dependent on the SHx voltage.
5.4
Currents at SH pins
The currents at the SH pins can be used for diagnostic purposes to check the health state of the power stage.
The simplified structure related to the SH currents the TLE7184F-3V is described by Figure 4.
BHx VDH
IBSH
40µA
SHx
RSHGN
80kΩ
SL
Figure 4 Block Diagram of SHx pin configuration
5.5
Electrical Characteristics
Electrical Characteristics MOSFET Drivers
V_S = 7.0 to 33 V, T_j = -40 °C to +150 °C all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)¹⁾
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
Inputs
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
Low level input voltage of ILx; IHx
High level input voltage of ILx; IHx
Input hysteresis of IHx; ILx²⁾
IHx pull-up resistors to VDD
ILx pull-down resistors to GND
V_{I_LL}
V_{I_HL}
d_VI
R_IH
R_IL
–
–
2.8
–
100 –
28.5 –
178.5 –
1.6
V
–
–
V
–
–
mV –
76.5 kΩ –
564 kΩ –
Datasheet
13
Rev.1.2, 2016-01-27