 English |
|
|
|
|
|
|
|
| TLD5541-1QV Datasheet, PDF (40/82 Pages) Infineon Technologies AG – H-Bridge DC/DC Controller with SPI Interface | |||
| |||
| ◁ |
H-Bridge DC/DC Controller with SPI Interface
TLD5541-1QV
Analog Dimming
> VIN(PO)
IVCC
> VIVCC_EXT_RTH,d
default output
current/voltage
adjustment
LIMPHOME
FAIL SAFE Circuit
HIGH
VIN
EN/INUVLO
SET
LHI
IVCC_ext
IVCC
BST1
BST2
M1
HSGD1
SWN1
M2
LSGD1
Set HIGH to
activate output
PWM I_LH
FAIL SAFE Circuit
SPI Writing
disabled during
Limp Home state
SWCS
PWM I
CSN
SI
SO
SCLK
VSS
SGND
PGND1
PGND2
LSGD2
SWN2
HSGD2
VFB
FBH
FBL
AGND
CIN
CIVCC
D1
D2
CBST1 CBST2
M4
LOUT
M3
COUT
Current
Regulation
RFB
Load
Figure 22 Limp Home state schematic overview
Using the SET pin to adjust the output current:
The SET pin is ignored if the device is not in Limp Home state.
For the calculation of the output current IOUT the following Equation (9) is used:
I OUT
= V FBH â V FBL
R FB
(9)
A decrease of the average output current can be achieved by controlling the voltage at the SET pin (VSET) between
0.2V and 1.4V. The mathematical relation is given in the Equation (10) below:
I OUT
= V SET â 200 mV
R FB â
8
(10)
If VSET is 200mV (typ.) the LED current is only determined by the internal offset voltages of the comparators.
To assure the switching activity is stopped and IOUT=0, VSET has to be <100mV, see Figure 23
Data Sheet
40
Rev. 1.0, 2016-05-20
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese