CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION (continued)
VBATT
VO = 5V/1.5A
IO =
VBATT
LM317
Adjust
VREF/RS
243Ω
0.1%
8.2KΩ
CM431
CM431
RS
0.1%
243Ω
0.1%
Figure 8.Precision 5V, 1.5A Regulator
Figure 9. Precision Constant Current Sink
VBATT
IO
RCL
0.1%
IN
OUT
VBATT
VO
78L05
Common
CM431
R1
R1
R2
CM431
IOUT = (VREF/RCL) + IKA
R1 = VBATT/((IO/hFE) + IKA)
VO = (1 + R1/R2) × VREF
Min VO = VREF + 5V
Figure 10. Output Control of a Three-Terminal
Figure 11. Precision Current Limiter
Fixed Regulator
2006/10/11 Rev.1.4
Champion Microelectronic Corporation
Page 8