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TLE7242-2G 데이터시트(PDF) 5 Page - Infineon Technologies AG

부품명 TLE7242-2G
상세설명  4 Channel Fixed Frequency Constant Current Control IC
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제조업체  INFINEON [Infineon Technologies AG]
홈페이지  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE7242-2G 데이터시트(HTML) 5 Page - Infineon Technologies AG

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Data Sheet
5
Rev. 1.0, 2008-07-09
TLE7242-2G
Overview
Figure 1
External Circuit Diagram for On/Off Mode Operation
1.3.2
Constant Current Mode Operation
During constant current operation, the POSx and NEGx pins must be connected to the circuit in the configuration
shown in Figure 2.
Note: An external recirculation diode is required in this configuration otherwise the IC may be damaged.
Figure 2
External Circuit Diagram for Constant Current Mode Operation
The constant current control circuit can operate in two modes; steady state mode and transient mode.
Steady-State Mode
During steady-state operation, the PWM control signal driven at the OUTx pin is controlled by the control loop
shown in Figure 3. The PWM Frequency is programmed via the SPI message # 1. In this message the main period
divider, N, can be set to any value between 79 and 214 -1. The equation for calculating the PWM frequency is:
Solenoid
R
SENSE
POSx
NEGx
OUTx
POSx
NEGx
OUTx
R
G
R
G
Q
DRV
Q
DRV
Solenoid
C
ESD
C
ESD
V
BAT
V
BAT
POSx
NEGx
OUTx
Solenoid
R
SENSE
D
RECIRC
Q
DRV
C
ESD
V
BAT
R
G
N
F
F
CLK
PWM
*
32
=


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