Part Number: UC1845 Hi,
The UC1845 datasheet section 8.3.1.4 RT/CT provides a recommended range for timing resistor R_RT (5Kohm-100Kohm) and timing capacitor C_CT (1nF-100nF), so does it mean the recommended maximum oscillating frequency f_OSC is 1.72/(5Kohm…
Other Parts Discussed in Thread: UC1845 Hello. Would anyone happen to have information on what the temperature coefficient of the 1V clamp inside the UC1845 chip is? I need to know if it increases or decreases with temp, and I can't seem to find any concrete…
In my application I must (at times) operate at low duty cycle, output is 500khz (1meg osc). I must operate at 2% duty cycle, which requires 40ns output on-time. The part outputs 0us on time with comp<0.5v, and jumps to about 140ns 0.5v<comp<0.9v.…
Part Number: UC1845A-SP Hi,
Please provide detailed package drawing for the LCCC-20 quickly, and as a .pdf (not autocad). Part # 5962-8670408VXA (uc1845alqmlv), LDC 1915A.
The datasheet for the UC1845A-SP does NOT have the LCCC-20 (FK) package drawing…
Other Parts Discussed in Thread: UC1845 , UC2845 Hi,
We dont find the simulation models for the UC1845/UC2845 in Tina. Do you have any micromodel text fixture for this. Can you please let us know how to simulate this reegulator.
Other Parts Discussed in Thread: UC1845 , UCC38C45 Hi
I am working in a flyback PS running on DCM using UC1845 or UCC38C45 the compensation is done by directly modulating the comp pin source current FB pin is at 0V.
What is the slope of the linear part…
Part Number: UC1845A-SP Other Parts Discussed in Thread: UC1845
For the UC1845, do we have an equivalent circuit diagram for the Rt/Ct pin internals that is similar to other controllers that use separate Rt & Ct connections? (see example below):
…
Part Number: UC1843-SP Other Parts Discussed in Thread: UC1845 , UC1843 , , UC1845-SP Hi Sir,
I wanted to use space grade PWM controller for forward converter with current mode control.
There are many space grade ICs available like: UC1843, UC1845
what are…
Hi Xing,
The UC1845 is rated to the higher temperature but does not come in the same package.
The UCC28C45 is rated to 105C and is pin to pin compatible,
Regards
Peter
Part Number: UC2825 Other Parts Discussed in Thread: UC1845 I think that equation of UC2825's output frequency is below;
fo = ?? / (Rt*Ct)
Please let me know about UC2825's factor of "??".
(For example, UC1845's factor is 1.72)
…
