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參數(shù)資料
| 型號(hào)： | TLE7242-2G |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封裝： | GREEN, PLASTIC, DSO-28 |
| 文件頁數(shù)： | 47/50頁 |
| 文件大?。?/td> | 1210K |
| 代理商： | TLE7242-2G |
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TLE7242-2G
Overview
Data Sheet
6
Rev. 1.0, 2008-07-09
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
Control Loop - Steady-State Mode
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
SENSE
setpoint
R
(11bit)
t
setpoin
mA
Current
320
2
]
[
11
=
()
)
1
(
1
*
28
.
1
)
(
)
(
1
*
28
.
1
+
=
+
=
k
INT
k
error
N
Rsense
KI
k
INT
k
INT
k
error
N
Rsense
KP
k
DutyCycle
A/D
Average
Autozero
Value
“ON”
-
CURRENT SET
POINT
DITHER STEP SIZE
Dither
Generation
+
KP
Σ
KI
PWM
Block
PWM
CLK
+
DITHER STEPS
OUTx
POSx
NEGx
Amp
+
-
Auto Zero
Autozero
Value
“OFF”
DUTY
CYCLE
CURRENT
READ
PRE-
LOAD
Italics = CAN BE MONITORED VIA SPI
Underlined = CAN BE PROGRAMMED VIA SPI
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