THV3056 Datasheet, PDF (24/32 Pages) THine Electronics, Inc. – 3ch Buck/Boost 2ch CP 1ch HVLDO 1ch LVLDO Controller

THV3056_Rev.2.00_E
Description of charge pumps. As to VGH, the voltage on INV_VGH pin is controlled to be equal to the voltage of VREF.
(See Figure 14.) The voltage on INV_VGH pin is the divided voltage of VGH by R9 and R10.
So
VGH
=
VR
EF



1
+
R^--R--1^-9--0^{-}
=
1.2  _1 + _R--^R--₁-⁹--₀-_
VGH
R9
INV_VGH
COMP1
-
VREF ⁺
R10
=1.2V
Output Circuit
Figure 14. Output Setting for VGH
As to VGL, the voltage on NON_VGL pin is controlled to be zero. (See Figure 15, Figure 16.) The current through
NON_VGL is negligible.
Therefore
VGL
=
–VREF


R_----1_---1_-
R12
=
–1.2

R_----1_---1_-
R12
VGL
R11
NON_VGL
R12
COMP1
+
-
Output Circuit
VREF
=1.2V
Figure 15. Output Setting for VGL
VGL
R11 _R12
0V
VREF（1.2V）
Figure 16. Output Setting for Inverting Mode
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