THV3058 Datasheet, PDF (17/21 Pages) THine Electronics, Inc. – 3CH (Buck/Boost) 2CH CP 1CH HVLDO Controller

THV3058_Rev.1.00_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 11). The voltage on INV_VGH pin is the divided voltage of VGH by R9 and R10.
So
VGH
=
VR
EF
×
⎛
⎝
1
+
RR_----78_{-⎠⎞}
=
1.2 × _⎝⎛1 + ^RR----⁷⁸-_⎠⎞
VGH
R7
INV_VGH
COMP
-
VREF ⁺
R8
=1.2V
Output Circuit
Figure 11. Output Setting for VGH
As to VGL, the voltage on NON_VGL pin is controlled to be zero (See Figure 12, Figure 13). The current through
NON_VGL is negligible.
Therefore
VGL
=
–(VREF
)
×
--^R---⁹---
R10
=
–1.2
×
--^R---⁹---
R10
VGL
R9
NON_VGL
R10
COMP
+
-
Output Circuit
VREF
=1.2V
Figure 12. Output Setting for VGL
R9
R10
VGL
VREF （1.2V）
0V
Figure 13. Output Setting for Inverting Mode
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