Part Number: UCC2804 Hi, my customer is using UC2804 as aux power. The schematic is as below.
BUS+ and BUS- are from PV panel. The PV panel's voltage will start rising with light on the panel.
Now when UC2804 start working when PV panel's voltage…
Part Number: UCC3805 Other Parts Discussed in Thread: UCC2805 , UCC2803 , UCC2802 , UCC2801 , UCC2804 Hi,
I'm using the UCC3805 controller in a flyback design, converting 8V to 500V. The existing design has a 12k and 1.1nF on the RC but when measured the…
Part Number: LM5155 Other Parts Discussed in Thread: UCC2804 , Hi,
On the case of UCC2804, we can find the CS blank time and the following sentence.
CS is the PWM comparator and an overcurrent comparator. The UCC280x family contains digital current sense…
Other Parts Discussed in Thread: UCC2804 Hello all
I designed two transistor flyback around UCC2804. Works fine except UCC2804 gets damaged sometimes, I suspect during start-up or shut-down - never observed it during normal work under load.
UCC2804 malfunction…
Other Parts Discussed in Thread: UCC2804 on the datasheet for the ucc2804 it states that the absolute max VCC is 12 V, but on the spec pages it lists the UVLO start at 12.5V. so either the datasheet has a problem or i don't understand the UVLO start voltage…
Other Parts Discussed in Thread: UCC2804 Can someone clarify note 2 with respect to the Vcc voltage on the UCC2804 datasheet page two ? I am getting hit by reliability because we have 11.74V on the Vcc pin. They way I read this note is that as long as…
Part Number: UCC2801 Other Parts Discussed in Thread: UCC2800 , UCC2802 , UCC2804 UCC2801
Ct=220pF
Rt=36.5k
I am expecting an output frequency between 75kHz and 87 kHz, but I am getting 91.88 kHz. Confirmed in time domain and via FFT.
However, in our hardware…
Hi,
Please look at section 8.5, page 7, note (5) cited below. UCC2805 OUT is half of Oscillator frequency.
(4) Oscillator frequency for the UCCx800, UCC2802, and UCC2803 is the output frequency. Oscillator frequency for the UCC2801, UCC2804, and UCC2805…
Hi Jason,
I found that UCC2804 may meet your requirement.
UCCx80x have the same pin configuration as the UCx84x family, and also offer the added features of internal full-cycle soft start and internal leading-edge blanking of the current-sense input. …
Hello zoujiangyilang,
It is easy enough to run the UCC3800 open loop at maximum duty cycle.
If you connect the FB pin to GND then the COMP pin will go to its maximum value and the duty cycle is maximum.
For a flyback application you will need to use…