LM4041-N, LM4041-N-Q1
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SNOS641F –OCTOBER 1999–REVISED JULY 2013
•
VO is the output voltage. The actual value of the internal VREF is a function of VO. The “corrected” VREF is
determined by
(1)
VREF = ΔVO (ΔVREF/ΔVO) + VY
where
•
VY = 1.240 V
and
•
ΔVO = (VO − VY)
(2)
ΔVREF/ΔVO is found in the Electrical Characteristics and is typically −1.55 mV/V. You can get a more accurate
indication of the output voltage by replacing the value of VREF in Equation 1 with the value found using
Equation 2.
Note that the actual output voltage can deviate from that predicted using the typical value of ΔVREF/ΔVO in
Equation 2: for C-grade parts, the worst-case ΔVREF/ΔVO is −2.5 mV/V. For D-grade parts, the worst-case
ΔVREF/ΔVO is −3.0 mV/V.
Typical Applications
Figure 20. Shunt Regulator
VO = VREF[(R2/R1) + 1]
Figure 21. Adjustable Shunt Regulator
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