Sulyn
For UC2842, the datsheet says "never" use RT < 5 k. The osc timing graph in Fig. 10 shows RT >= 5 k always, so it's not allowed to use RT < 5 k.
As I asked above, what Dmax does the customer require? Why are they using RT = 680 ohm?
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Sowmya,
Thanks for your interest in TI here.
For completeness can you share an image of your schematic as well as the simulation conditions you are running?
Are you implementing soft start using RSS and CSS? If so maybe try increasing the time…
Part Number: UC2842 Hi I have attached two images for more reference.
1.What is the voltage range? ( marked as yellow colour )
2. Explain the Auxiliary Transformer working ? Why it is needed ? ( Marked in red colour )
3. Explain the optoisolator…
Part Number: UC2842 Hi Team,
My customer is evaluating UC2842AN w/ a transformer. All calculated is based on WEBENCH.
Based on WEBENCH result, we create a PCBA to test. However, it doesn't work. Please see attached - PCBA schematic and transformer…
Part Number: UC2842 Hi Team,
My customer is using our UC2842 in old product, recently they need to improve the protection feature, they hope to realize Hiccup mode when load shorted. I'm thinking that when output was shorted, as the auxiliary transformer…
Part Number: UC2842 Hi Team,
UC2842 datasheet shows the recommended range of timing resistor values is between 5 kΩ and 100 kΩ, my customer would like to know what if he puts a resistor value below than 5kΩ? Does the equation of fosc=1.72/(Rrt*Cct)…
Other Parts Discussed in Thread: UC2842 Dear,
One customer reported the mistake when he designed with UC2842 webench model.
The initial thread is here.
e2e.ti.com/.../1997005
The optical coupler was placed wrongly.
Please help to check it…
Other Parts Discussed in Thread: UC2842 , UC1842 Hi all
Would you mind if we ask UC1842/3/4/5 and UC2842/3/4/5? We recognize that the formula of minimum on time is as the follow; -tONmin=D / Fsw
About Fsw, there is only typ value. Our customer would…
