TLE72422GXT Infineon Technologies, TLE72422GXT Datasheet - Page 6

• Manufacturer Part Number: TLE72422GXT
• Manufacturer: Infineon Technologies

Specifications of TLE72422GXT

• Operating Temperature (max): 150C
• Operating Temperature (min): -40C
• Pin Count: 28
• Mounting: Surface Mount
• Screening Level: Automotive
• Lead Free Status / Rohs Status: Compliant

The 11 bit Current Set Point is programmed via the SPI message #3. The equation for calculating the current
setpoint is:
The Proportional coefficient (KP) and the Integral coefficient (KI) of the control loop are programmed in SPI
message #5. The KP and KI values should be set to values that result in the desired transient response of the
control loop. The duty cycle of the OUTx pin can be calculated from the difference equations:
where error is the difference between the commanded average current and measured average current in units of
Amps.
where k indicates the integral number of PWM periods that have elapsed since current regulation was initiated.
Figure 3
Auto Zero
When a channel is configured for constant current operation and the current set point is 000h for 256 consecutive
PWM periods, an autozero sequence is initiated. The autozero sequence will measure the offset of the current
Data Sheet
Control Loop - Steady-State Mode
DITHER STEP SIZE
DITHER STEPS
CURRENT SET
DutyCycle
INT
POINT
(
k
)
Generation
=
Dither
Current
KI
( )
k
+
∗
+
=
. 1
setpoint
Rsense
KP
28
Underlined = CAN BE PROGRAMMED VIA SPI
Italics = CAN BE MONITORED VIA SPI
+
CURRENT
∗
READ
[
∗
-
mA
N
. 1
Rsense
]
28
*
=
Average
error
KI
setpoin
∗
6
N
KP
Autozero
Value
“ON”
2
LOAD
PRE-
*
(
Σ
11
t
Auto Zero
(11bit)
k
error
-
−
+
Autozero
1
Value
“OFF”
+
)
∗
+
(
+
k
A/D
R
INT
320
SENSE
−
1
PWM
Block
PWM
CLK
)
(
+
k
Amp
INT
−
CYCLE
DUTY
) 1
(
k
Rev. 1.0, 2008-07-09
)
TLE7242-2G
POSx
NEGx
OUTx
Overview