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how PWM IC UC2843 works?

Zippora

Aug 26, 2016
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Can you explain me how the circuit works? It is DC driver circuit of LED Light?
 

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Alec_t

Jul 7, 2015
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Have a look at Fig 32 (page 13) of this version of the datasheet.
Also, read the Design Considerations on page 11.
 

Zippora

Aug 26, 2016
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In attached DC driver circuit, I_Sense is applied to inverting terminal of OPAMP LM324 and then it is applied to pin no. 3 current sense of UC 2843. Is I_Sense input is integrated by opamp LM324 and then applied to UC2843?
 

Alec_t

Jul 7, 2015
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Hard to say, since component values aren't specified.
Looks as though the Isense signal is being low-pass filtered.
 

Zippora

Aug 26, 2016
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Please find attached file. R49 and R30 are used to change the driver configuration say 18W to 15W,etc. Will it help?
 

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Alec_t

Jul 7, 2015
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Changing R30/49 will change the opamp gain and hence the current feedback value that the regulator receives. This will change the regulator's output.
 

Manoj kundu

Mar 23, 2018
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How pulse control logic and v ref good logic works in IC UC2843AQ with internal logic cct
 
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