TL431 Datasheet, PDF (17/23 Pages) Motorola, Inc – PROGRAMMABLE PRECISION REFERENCES

NXP Semiconductors
13. Application information
V+
TL431 family
Adjustable precision shunt regulator
V_OUT
R1
V_OUT = _⎝⎛1 + ^RR-----¹²-_⎠⎞ × V_ref
Fig 26. Shunt regulator
V+
R2
006aab592
V_OUT
R1
R2
V_OUT = _⎝⎛1 + ^RR-----¹²-_⎠⎞ × V_ref ; V_OUT(min) = V_ref + V_be
Fig 27. Series pass regulator
006aab593
V+
V_OUT
V_IN
006aab594
Fig 28.
V_th = V_ref
V_IN < V_ref ⇒ V_OUT > 0
V_IN > V_ref ⇒ V_OUT ≅ 2V
Single-supply comparator with temperature-compensated threshold
TL431_FAM_2
Product data sheet
Rev. 02 — 20 January 2010
© NXP B.V. 2010. All rights reserved.
17 of 23