UC3844AD1 查看數據表（PDF） - STMicroelectronics
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UC3844AD1 Datasheet PDF : 16 Pages
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UC384XA - UC284XA
Figure 18. Under Voltage Lockout.
7
ON/OFF COMMAND
Vi
TO REST OF IC
ICC
VON
VOFF
UC3842A UC3843A
UC3844A UC3845A
16V
8.4V
10V
7.6V
<17mA
<0.5mA
D95IN346mod
Figure 19. Current Sense Circuit.
ERROR
AMPL.
2R
IS
1
COMP
R
R
3
CURRENT
RS
C
SENSE
5
GND
D95IN347
Peak current (is) is determined by the formula
I
S
ma
x
≈
1----.-0----V---
RS
A small RC filter may be required to suppress switch transients.
Figure 20. Slope Compensation Techniques.
VOFF VON
VCC
1V
CURRENT
SENSE
COMPARATOR
IS
RSLOPE
R1
RS
VREG
8
RT
RT/CT 4
CT
ISENSE
3
5
GND
IS
RSLOPE
R1
RS
VREG
8
RT
RT/CT 4
CT
ISENSE
3
5
GND
D95IN348
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