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UPC1934 Datasheet(Fiches technique) 12 Page - NEC

Numéro de pièce UPC1934
Description  DC-DC CONVERTER CONTROL IC
Télécharger  20 Pages
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Fabricant  NEC [NEC]
Site Internet  http://www.nec.com/
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UPC1934 Datasheet(HTML) 12 Page - NEC

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Data Sheet G13567EJ3V0DS00
12
µµµµ PC1934
3.
NOTES ON USE
3.1
Setting the Output Voltage
Figure 3-1 illustrates the method of setting the output voltage. The output voltage is obtained using the formula shown in
the figure.
The common mode input voltage range of the error amplifier is 0 to 0.4 V (TYP.) for both the error amplifiers, E/A1 and
E/A2. Therefore, select a resistor value that gives this voltage range.
Figure 3-1 Setting the Output Voltage
(1) When setting a positive output voltage using error amplifier E/A1.
(2) When setting a negative output voltage using error amplifier E/A2.
16
4
3
5
RNF
CNF
R4
R3
R2
R1
VREF
VREF
VOUT (positive voltage)
VOUT = 1 +
R1
R2
••
R4
R3 + R4
E/A1
16
13
14
12
RNF
CNF
R4
R3
R2
R1
VREF
VREF
VOUT (negative voltage)
VOUT =
R1R4
−R2R3
R1 (R3+R4)
E/A2


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