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
R9
R10
R9
R10
VGH = VREF 1 + -------- = 1.2 1 + --------
VGH
R9
COMP1
INV_VGH
-
Output Circuit
+
VREF
=1.2V
R10
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
R11
R12
R11
R12
--------
--------
= –1.2
VGL = –VREF
VGL
R11
COMP1
NON_VGL
+
-
Output Circuit
R11
R12
R12
VGL
VREF（1.2V）
0V
VREF
=1.2V
Figure 15. Output Setting for VGL
Figure 16. Output Setting for Inverting Mode
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