TLD5190QV Datasheet, PDF (26/58 Pages) Infineon Technologies AG – H-Bridge DC/DC Controller for High Power LED Lighting

H-Bridge DC/DC Controller
TLD5190QV
Regulator Description
6.6
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 (4):
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}
(4)
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 16 Programming Output Voltage (Constant Voltage Regulation)
Data Sheet
26
Rev. 1.0, 2016-05-20