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REF3220AMDBVREP 데이터시트(PDF) 10 Page - Texas Instruments

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부품명 REF3220AMDBVREP
상세설명  4 ppm100 A SOT23-6 SERIES VOLTAGE REFERENCES
PDF  25 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

REF3220AMDBVREP 데이터시트(HTML) 10 Page - Texas Instruments

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V
BANDGAP
Vbe
1
-
+
Vbe
2
-
+
R1
Q
2
N
Q
1 I
REF3212-EP, REF3220-EP, REF3225-EP
REF3230-EP, REF3233-EP, REF3240-EP
SBVS078B
– OCTOBER 2006 – REVISED AUGUST 2011
www.ti.com
THEORY OF OPERATION
The REF32xx is a family of CMOS, precision bandgap voltage references. Figure 3 shows the basic bandgap
topology. Transistors Q1 and Q2 are biased so that the current density of Q1 is greater than that of Q2. The
difference of the two base-emitter voltages (Vbe1 – Vbe2) has a positive temperature coefficient and is forced
across resistor R1. This voltage is amplified and added to the base-emitter voltage of Q2, which has a negative
temperature coefficient. The resulting output voltage is virtually independent of temperature.
Figure 3. Simplified Schematic of Bandgap Reference
10
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Copyright
© 2006–2011, Texas Instruments Incorporated
Product Folder Link(s): REF3212-EP, REF3220-EP, REF3225-EP REF3230-EP, REF3233-EP, REF3240-EP



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