CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION CIRCUIT
Notes for Application Circuit：
1) Set VOUT according to the following equation：
VOUT =VREF ( 1 + R1/R2 ) +IREF 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 VIN
（
）.
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：
VIN（
max）
Rmin
≥
（to limit instantaneous turn-on Iz）
150mA
VIN（
–VOUT
max）
Rmin
≥
（to limit Iz under normal operating conditions）
IOUT（
+ 100mA
min）
2006/02/10 Rev. 5
Champion Microelectronic Corporation
Page 9
ETC [ ETC ]
