TLD5541-1QV Datasheet, PDF (32/82 Pages) Infineon Technologies AG – H-Bridge DC/DC Controller with SPI Interface

H-Bridge DC/DC Controller with SPI Interface
TLD5541-1QV
Regulator Description
6.7
Programming Output Voltage (Constant Voltage Regulation)
For a voltage regulator, the output voltage can be set by selecting the values R_FB1, R_FB2 and R_FB3 according to the
following Equation (8):
V_OUT
= _{⎜⎜⎝⎛} I _FBH
+ ^{VFBH − FBL}
R_{FB 2}
⎟⎟⎠⎞
⋅
R _{FB 1}
+
⎜⎜⎝⎛
V_{FBH − FBL}
R_{FB 2}
− I _{FBL ⎟⎟⎠⎞} ⋅ R_{FB 3} + V_{FBH − FBL}
(8)
After the output voltage is fixed via the resistor divider, the value can be changed via the Analog Dimming bits
ADIMVAL.
If Analog dimming is performed, due to the variations on the I_FBL (I_{FBL_HSS} (P_6.4.9) and I_{FBL_LSS} (P_6.4.40))
current on the entire voltage spanning, a non linearity on the output voltage may be observed. To minimize this
effect RFBx resistors should be properly dimensioned.
V_OUT
I_FBH
FBH
I_FBL
FBL
R_FB1
RFB2
R_FB3
Figure 18 Programming Output Voltage (Constant Voltage Regulation)
Data Sheet
32
Rev. 1.0, 2016-05-20