Datasheet

PARAMETER MEASUREMENT INFORMATION
2.5 V
0.5 mA
Comp
V
FB
Zi
Zf
2
1
On/Off Command
to Rest of IC
V
CC
V
ON
V
OFF
I
CC
<17 mA
< 0.5 mA
V
OFF
V
ON
V
CC
During UVLO, the output is low.
8.4 V
7.6 V
UC2843A
Error
Amp
Current
Sense
Comparator
COMP
Current
Sense
GND
I
S
R
C
R
S
2R
R
1 V
1
3
5
UC2843A-Q1
www.ti.com ........................................................................................................................................................................................................ SGLS384 – MAY 2008
A. The error amplifier can source up to 0.5 mA and sink up to 2 mA.
Figure 1. Error Amp Configuration
Figure 2. Undervoltage Lockout
A. Peak current (Is) is determined by the formula: Ismax = 1.0 V/R
S
A small RC filter may be required to supress switch transients.
Figure 3. Current Sense Circuit
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Product Folder Link(s): UC2843A-Q1