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UC3842 Datasheet(PDF) 5 Page - Fairchild Semiconductor

Part No. UC3842
Description  SMPS Controller
Download  12 Pages
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

UC3842 Datasheet(HTML) 5 Page - Fairchild Semiconductor

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UC3842/UC3843/UC3844/UC3845
5
Figure 2. Under Voltage Lockout
During Under-Voltage Lock-Out, the output driver is biased to a high impedance state. Pin 6 should be shunted to ground with
a bleeder resistor to prevent activating the power switch with output leakage current.
Figure 3. Error Amp Configuration
Figure 4. Current Sense Circuit
Peak current (IS) is determined by the formula:
A small RC filter may be required to suppress switch transients.
UC3842/44 UC3843/45
I
S MAX
() 1.0V
R
S
------------
=


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