Part Number: UCC28730 Hi, I am designing a Flyback-converter and am cuurently planning to use the UCC28730. How does the controller behave, when the maximum duty cycle is reached at a lower frequency then the 83kHz maximum frequency of the controller? For…
Part Number: UCC28730-Q1 Other Parts Discussed in Thread: UCC28730 Hi
From the simulation result, controller will stop working(no DRV) when VOUT rise to the design value 12V, it looks like the VS level is above 4.6V and trigger the OVP,
I want to consult…
Part Number: UCC28730-Q1 Hi,
Attached file slum527 is simulation file from TI website, it is a 5V/2A output with a minium Vin around 86V
Attached file Vin_50V_Vout_12v is a new design simulation file based on slum527, I modify the Rcs,Rs1,Rs2 for a new…
Part Number: UCC28730 Hi,
I have designed a 10 W Flyback-Converter with 3 Outputs with a Inputvoltage of 60-1000V and an Outputvoltage of 15V. I am now trying to put the PCB in operation, but I am facing unstable switching behaviours. To simplify the…
Part Number: UCC28730-Q1 Other Parts Discussed in Thread: UCC28730 Q1: Why Rs2 is not present in below formula? I think Ivsl(run) go both RS1 and Rs2, isn't it ?
Q2, I am doing the design from DC input and the VIN(min) is as low as to 50V,output is…
Part Number: UCC28730-Q1 Hi,
Q1: I don't understand why Dmax is derived at fmax? From below formula, the duty cycle is minimum when switch frequency is maximum, isn't it?
:
Q2: I don't understand the principle why Dmagcc is fixed internally…
Part Number: UCC28730-Q1 Other Parts Discussed in Thread: UCC28730 , UCC24650 , Every schematic I see with the UCC28730 always has a wake-up UCC24650 on the secondary side.
Is this needed? Will the flyback work without it?
For example if I have a diode,…
Part Number: UCC28730-Q1 Other Parts Discussed in Thread: UCC28730 Hi team,
My customer would like to us know if UCC28730-Q1 can be used as HV redundancy flyback for input range from 40V to 880V?
Also can this flyback controller be configured for multiple…
Part Number: UCC28730 Other Parts Discussed in Thread: UCC24650
Hello I tried looking around at some previous forum posts and SLUAAC5 "Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips" ( https://www.ti.com/lit/an…
Part Number: UCC28730 Hello - we are designing a 15W, 12Vout, DCM flyback using the UCC28730 controller.
The Vs pin is specified at -0.75V to 7V.
I am wondering about the -0.75V spec. Typically the aux voltage feeding Vs will be significantly less than…
