LM4041 Datasheet, PDF (6/7 Pages) National Semiconductor (TI) – Precision Micropower Shunt Voltage Reference

LM4041
Preliminary
LINEAR INTEGRATED CIRCUIT
„ APPLICATION INFORMATION
V_Z is set according to the equation shown as below which can be set by a user-defined resistor divider.
V_S
R_S
LM4041
V_{REF R1}
R2
R2
V_Z = V_REF 1+ _R1
Adjustable Shunt Regulator
Cathode and Load Currents
The total current available to supply the load (I_L) and bias the UTC LM4041 (I_Z) is set by R_S, so its value must be
set properly. In all cases, I_Z must stay in a specified range for proper operation of the reference; R_S must be small
enough to supply the minimum I_Z. At maximum V_S and minimum I_L, to limit I_Z to not exceed rating of 12 mA, RS must
be large enough.
R_S=
(V_S
(I_L
− V_Z )
+ I_Z )
V_S
I_Z + I_L
R_S
V_Z
I_L
I_Z
LM4041
Shunt Regulator
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 7
QW-R101-027.a