TLE7231G_15 Datasheet, PDF (13/30 Pages) Infineon Technologies AG – 4 channel low-side driver

SPI Driver for Enhanced Relay Control
SPIDER - TLE7231G
Power Stages
Maximum Load Inductance
During demagnetization of inductive loads, energy has to be dissipated in the TLE7231G.
This energy can be calculated with following equation:
E = V_DS(CL) ⋅
V_{-----B---A---T----}–_-----V_{----D----S---(-C----L--)}
⋅
⎛
ln⎜1
–
-----------^R-----^L----^â‹---^I--^D-------------
⎞
⎟
R_L
⎝ ^V_BAT ^{– V}_DS(CL) ⎠
+ I_D
⋅ --^L----
R_L
Following equation simplifies under the assumption of R_L = 0:
E
=
1_--
2
LI_D²
⋅
⎛
⎜1
–
-------------^V-----^B---^A---^T--------------
⎞
⎟
⎝ ^V_BAT ^{– V}_DS(CL) ⎠
The maximum energy, which is converted into heat, is limited by the thermal design of the component.
6.3
Timing Diagrams
The power transistors are switched on and off with a dedicated slope via the IN bits of the serial peripheral
interface SPI. The switching times t_ON and t_OFF are designed equally.
CS
VDS
80%
SPI: ON
tON
SPI: OFF
tOFF
t
20%
Figure 6 Switching a Resistive Load
SwitchOn.emf
t
In input mode, a high signal at the input pin is equivalent to a SPI ON command and a low signal to SPI OFF
command respectively. Please refer to Chapter 9.3 for details on operation modes.
The listed switching times are not valid, when switching to or from stand-by mode.
6.4
Electrical Characteristics Power Stages
V_DD = 3.0 V to V_DDA, V_DDA = 4.5 V to 5.5 V, T_J = -40 °C to +150 °C
All voltages with respect to ground, positive current flowing into pin (unless otherwise specified)
typical values: V_DD = 5.0 V, V_DDA = 5.0 V, T_J = 25 °C
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
Power Supply
6.4.1 Digital supply voltage
V_DD
3.0
–
6.4.2 Digital supply current all channels I_DD(ON) –
–
ON
5.5
V
–
100
µA
V_DD = V_DDA = 5 V
V_RST = V_CS = V_DD
V_SCLK = 0 V
V_IN = 0 V
Datasheet
13
Rev. 1.2, 2014-05-09