THV3058 Datasheet, PDF (16/21 Pages) THine Electronics, Inc. – 3CH (Buck/Boost) 2CH CP 1CH HVLDO Controller

THV3058_Rev.1.00_E
● Output Voltage Setting
Figure 10 shows CH-1 and CH-2 output voltage setting model. The voltage on INV1 pin is equal to the voltage on VREF
pin due to the effect of feed-back. The voltage on INV_1 pin is the divided voltage of Vout by R1 and R2.
So,
Vou
t1
×
-------^R---²--------
R1 + R2
=
VREF
Therefore,
Vout1
FB1
Vout1
=
VRE
F
×
⎛
⎝
1
+
RR_----12_{-⎠⎞}
C1
Since VREF =1.2V, then
Vout1 = 1.2 × _⎝⎛1 + ^RR----¹²-_⎠⎞
R1
R3
R2
C2
INV1
Error AMP1
-
VREF ⁺
=1.2V
PWM
Comp.
Similarly the output voltage of CH-2 is
described as follows.
Vout2 = 0.85 × _⎝⎛1 + ^RR----⁴⁵-_⎠⎞
Vout2
FB2
C3
R4
C4
R6
Error AMP2
-
PWM
R5
INV2 _{VREF +}
Comp.
=0.85V
Figure 10. Output Voltage Setting
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THine Electronics, Inc.