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51 Threads found on edaboard.com: Type 2 Compensation
Hi guys, I have one question: I have read around some technical white papers and in some books that the type II is suitable for a phase boost of 90? and for converter operating in current-mode and CCM. However, there is two white papers from two manufacturers that says that this compensator can be used to compensate converters that have a large
Do you agree with the following ?rules? (A to D) on the checking of type 2 compensator pole and zero positions? This is with regard to a CCM, Current mode flyback with a type 2 feedback compensation network..That is, making sure it is not going to be unstable.. ?The type 2 compensator zero MUST BE at (or very near) (...)
Hello, On pages 212 to 217 of ?Power supply cookbook? by Brown, it goes through a type 2 error amplifier feedback compensation scheme for a CCM flyback in current mode. It discusses the placement of the error amplifier's poles and zero, but does not do this with respect to the power stage RHPZ. Why is no mention made of the RHPZ? Surely an error
One nice thing about the transconductance type is that the FB pin is actually a high impedance, which can simplify the design of compensation and feedback networks. Also since the COMP output is high impedance, you can override it with external circuitry easily. Major con is that the transconductance may have a large tolerance to it.
Current mode control is probably best. Constant off time control is also good sometimes. Sometimes Boundary conduction mode is done as in BCM PFC's. Constant frequency current mode needs slope compensation if duty >50%. Voltage mode is possible and needs type 3.....but very few voltage mode controllers exist on the market. if its just low power
I am using K-type Thermocouple with Ungrounded junction. all the required circuits such as, cold junction compensation, filtration and amplification is working perfectly. My problem is at room temperature Sensor is showing same temperature of 0.5 degree greater than Thermometer. ( Room Temp aroung 26 to 28 *C). But at lower temperature this differe
hello, Analog Device AOP : Pretrimmed for type J (AD594) or type K (AD595) Thermocouples Can Be Used with type T Thermocouple Inputs Low Impedance Voltage Output: 10 mV/8C Built-In Ice Point compensation Wide Power Supply Range: +5 V to 615 V Low Power: <1 mW typical Thermocouple Failure Alarm Laser Wafer Trimmed (...)
Hi, what are poles and zeroes in a compensation network like type-3 compensation for 2 stage cmfb amp. how we can boost phase margin without affecting Bandwidth. by using miller compensation cap, BW decreases. thanks Safiya
Dear friends , I need to make a j type temperature controller . PLease suggest me how to proceed , never used one before . 1. I need circuit used for j type thermocouple signal amplification using opamp op07 and diode for cold junction compensation , I have seen temperature controllers using thermocouples in mkt and they use a diode (...)
When You designing two stage ota, the first of all You need to add a compensation network (e.g. Miller cap with nulling resistor or used a cascode compensation). Your amplifier is unbalanced - output transistor should be matched with first stage current mirror load. In addition the phase margin and GBW depends to feedback type, reference (...)
Dr Ridley, in his book, "power supply design", volume 1 , control, states on page 73 that regarding using a type 2 compensator for a buckboost, "the first pole of the compensator is placed at the origin to form an integrator" However, in the attached type 2 compensator, the first pole is f = 1......and this cannot be placed a
the above , why can I not place a resistor in series with C1 on the schematic on page 31? ((On page 36, they have placed a resistor (R2) in series with the C1 there, so why can't it be done with the circuit on page 31?)
Hello, Please, I am in the process of designing a 20 to 400V dc-dc converter but I don't know which type of feedback to use. Should I use an opto-coupler Isolated feedback or can I use a direct feedback consisting of voltage divider network at the high voltage side. I am using SG3524 for PWM control of the converter. Please, any suggestion is welc
Most voltage mode controllers allow to set a fixed duty cycle by holding the compensation pin at a fixed voltage, either by a DC feedback network or a voltage source (in case of OTA type error amplifier).
Hi - I'm working on a design that uses a Linear LTC1700. I'm trying to choose values for the parts that sit on the ITH pin, but just want to make sure I'm understanding the type of network that it is using. Looking at the block diagram on page 6, it looks like it has an error amplifier wi
What battery type you use in your system or plan to use?
Dear amu_cpln, if I use a type B thermocouple, which gives 0V between 0 °C and 50 °C, is needed the cold junction compensation? if yes what is its temperature coefficient? Thank you for reply. Roberto
You have a series capacitor in all the limiter outputs, which means the circuits don't carry DC. Are you trying to make some type of capacitor charging limiter? :?:
To me this looks simply like "feedforward compensation" in the feedback ladder. You see it often enough in regulators. Also called "type III" compensation. There should be no DC term, then your concerns about temperature drift (from that) go away. PSRR should be improved at medium frequencies where you are making better use of amplifier (...)
They will cancel, but this is not reason for impossibility. Imagine a system consisting in two cascaded, not coupled parts. The first one can have a pole at some location, and the other one can have a zero at the same location. This type of cancellation is usual in compensation for control systems. Regards Z
Thanks for the help! I'll compensate it with type II compensation network. However I have one more question. The attached figure shows the bode plot for the same converter in DCM. However I've changed the small signal feedback gain a bit. Green line corresponds to k=0.1; blue line to k=0.15 and red on to k=0.2. Simulations (using ideal com
hello can anyone suggest me how to control quasi resonant buck. I had designed the power stage for 2MHz switching operation (resonant freq is 2.7 MHz). In my feedback loop i am using VCO and Eamp with type 3 compensation. I had reffered ON semiconductors appl.nte for the compensator design. The problem is my output is settling at required voltag
You're using an Ahuja type of compensation. It's purpose is to eliminate the RHP zero. Interesting why you see RHP zero that's lower than the dominant pole? Putting a capacitor around M3 may help by reducing the loop gain at higher frequencies but it is not addressing the main problem. To a first order the pmos current sources should not affect th
Can the RHP be dealed with the type III compensation, because the extra zero.
Greetings people. 1) I need a suggestion for a good book that focuses mainly on buck regulator design, single and multi-phase and with good explanation of type-ii and type-iii compensation. 2) I am trying to understand a simple buck regulator's loop stability with a type-ii or type-iii compensator, not (...)
In one of consideration, for PFM with hysteresis type, the voltage ripple caused by ESR of output capacitor should be larger than the comparator hysteresis.
While using SG3524, for buck converter, I need to give a feedback to the error amplifier at pin 1. At the output of the error amplifier (pin 9) I have the Caps and Resistors for compensation. Do the capacitors here need to be ceramic disc capacitors necessarily? Or any specific type of capacitors?? Cannot I use Electrolytic aluminium capacitors? T
Dear Forumites, Has anybody implemented error amplifier for compensation of regulator using Verilog-A. If so can anyone post the verilog-A code which can be used for type-2 compensation. I have tried creating one using model writer, but to the failure. So looking forward for some help. Ni1009
Dear friends , can some one share some details about type-3 compensation simulation for DC-DC development. I have simulated type-3 given in intersil document which i have attached. But whatever i have simulated is bit revese and stange also. So please can some one eloborate/help on this. Ni Hi Ni1009, I don`t know if
members, Need details or reference for type 3 compensation in UC3525 based dc dc converter. I need practical design steps that will be helpful in designing.\ Any member who have access for such design steps details or any software that help for such calculation? Please give your comments/suggessions. Regards, Bharat
Hi, I'm working for a company in Chicago and doing continuous mode boost smps at 17V in and 27V out to drive LEDs at 350mA for signage. (10W) Anyway: The following circuit uses components C1, C2 and R5 to give a type 2 compensaton to the is the LED current at start up for
hello, Does any reader know of a book that gives transfer functions for opto-isolated SMPS? (ie the transfer function for the opto configuration so that i can do the loop compensation.) Basso book has it but only type 2 and 3 with R(led) and R(upper) connected either side of a little inductor....i don't have such an inductor in my circuit so
hello does anybody know how i can model a 4N35 opto coupler for use in an offline SMPS feedback control circuit ? it is a one transistor forward converter and i need to use type 3 compensation. 4N35 datasheet:- Page 2 (top) of this shows type 3 compensation
if we use ceremic capacitor (MLCC) as outout cap in voltage mode , we can use type III compensation topology, but if we use MLCC in current mode , what is the compensation structure ? Whether it is still the gm Erroramp which output connects with R-C string or not ? I found that I can't compensate if there is no ESR zero.
Hi, Can anyone plaese tell me how to design an Error Amplifier for voltage mode buck converter.The Error Amplifier is of compensation PI type. I am perticularly inetersted in the design of Amplifier than the compensation. Thanks, Captab
the method you apply to simulation the GBW and the type of your opamp(single end or full differential) will make the "GBW" you got from the AC sweep result different. Do you consider it?
I think ,if I type compensation the err amp is ota. II or III type compensation both ota or op-amp is ok? is it correct?
do you mean a 2-stage fully differential op-amp? what is your amplifier architecture? which type compensation?
How do we analyse temperature compensation in op-amps using spice? I am using spectre for the same. So how can this be done for a bandagap type of circuit?
hi, need help to design /analyse open / closed loop of pwm boost type dc-dc convertor. best if we can have BODE plot to fix those inductor, capacitor,... values thanks in advance.
i have a question, The dirver MOS of LDO is used. what different the MOS use N-type or P-type??? Using NMOS driver have some advantage??? use nmos has lower ouput impedance and no need external capacitor for compensation.
Hi: The BGR circuit could be designed for supply voltage down to 1.8-V, with approximately 400uA of current consumption, however the offset compensation amplifier for PSSR suppresion, need to be a folded cascode type to relax the voltage headroom limitation. Rgds
Any comments (pros & cons) on using opamp and OTA(output Transconductance Amplifier) for compensation as type 1,2,3 for DC/DC converter (voltage mode control) ? Thanks.
This type of error amplifier has never been my preference, even though some personalities advocate its use. I prefer the type 2 EA, that introduces a zero and helps boost the phase margin. Anyway, to answer your question, look at the picture of the Bode plot and note that the resulting gain (in dB) is merely an addition of the top two. The gain
what 's buck converter do you work ? Voltage mode and current mode is so different. if you using voltage mode , you can use type ii and type III compensation . but you using current mode , you just using R,C compensation in the Error amplifier out .
this is a BJT type bandgap ckt, u can check Fig4.4 in and this book also discuss what u want to know in some chapters.
FOR ?5v power supply, i think the process must be selected carefully. for other spec. , the type amplifier is so simple. first, you can use the cascode differential input stage , and the common source as the second stage. the miller compensation is enough.
slope comp is for current mode ic's only. better to start with voltage mode (simply comparing error voltage to a ramp) because it is more clear. so there are a few kinds of compensation. if your output cap has a lot of ESR, you get a free low-frequency zero and can use type 2 compensation (1 pole, 1 zero). if you have a low-esr (...)
Hi all What is the compensation network used for ? There are type I ,II and III, what's the difference ? Thanks --------------- chmr
In what type of applications you use this law? I have never heared for it.