CM431L Datasheet, PDF (9/13 Pages) List of Unclassifed Manufacturers – LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR

APPLICATION CIRCUIT
CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
Notes for Application Circuit：
1) Set V_OUT according to the following equation：
V_OUT =V_REF ( 1 + R1/R2 ) +I_REF R1
2) Choose the value for R as follows：
• The maximum limit for R should be such that the
cathode current, Iz, is greater than the minimum
operating current（80μA）at V_IN（_min）.
• The minimum limit for R should be such that Iz
does not exceed 100mA under all load conditions,
and the instantaneous turn-on value for Iz does not
exceed 150mA. Both of the following conditions
must be met：
R_min ≥
V_IN（_max）
（to limit instantaneous turn-on Iz）
150mA
R_min ≥
V_IN（_max）–V_OUT
I_OUT（_min）+ 100mA
（to limit Iz under normal operating conditions）
2006/02/10 Rev. 5
Champion Microelectronic Corporation
Page 9