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S-19244B12H-A8T1U Datasheet(HTML) 32 Page - ABLIC Inc.

Part No. S-19244B12H-A8T1U
Description  AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
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Maker  ABLIC [ABLIC Inc.]
Homepage  https://www.ablic.com
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S-19244B12H-A8T1U Datasheet(HTML) 32 Page - ABLIC Inc.

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AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 1000 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
S-19244xxxH Series
Rev.3.2_00
32
9. Types in which output voltage is externally set
The S-19244xxxH Series provides the types in which output voltage can be set via the external resistor. The output
voltage can be set by connecting a resistor (Ra) between the VOUT pin and the VADJ pin, and a resistor (Rb)
between the VADJ pin and the VSS pin.
The output voltage is determined by the following formulas.
VOUT = 1.0
+ Ra × la ···················· (1)
By substituting Ia = IVADJ
+ 1.0 / Rb to above formula (1),
VOUT = 1.0
+ Ra × (IVADJ + 1.0 / Rb) = 1.0 × (1.0 + Ra / Rb) + Ra × IVADJ ······· (2)
In above formula (2), Ra
× IVADJ is a factor for the output voltage error.
Whether the output voltage error is minute is judged depending on the following (3) formula.
By substituting IVADJ = 1.0 / RVADJ to Ra
× IVADJ
VOUT = 1.0
× (1.0 + Ra / Rb) + 1.0 × Ra / RVADJ ················ (3)
If RVADJ is sufficiently larger than Ra, the error is judged as minute.
VSS
VOUT
VIN
VADJ
VOUT
Ra
Rb
Ia
Ib
RVADJ
IVADJ
1.0 V
Figure 33
The following expression is in order to determine VOUT = 6.0 V.
If Rb = 2 k
Ω, substitute RVADJ = 600 kΩ typ. into (3),
Ra = (6.0 / 1.0
− 1) × ((2 k × 600 k) / (2 k + 600 k)) ≅ 9.97 kΩ
Caution The above connection diagrams and constants will not guarantee successful operation. Perform
thorough evaluation using the actual application to set the constants.


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