1200p60 |LINK|
What is 1200p60 ???? ??????? ????? and How Does It Work?
If you are looking for a low-power, cost-effective, and reliable solution for your switchmode power supplies, you might want to consider the 1200p60 ???? ??????? ?????. This is a PWM current-mode controller that can operate without an auxiliary winding and provide excellent performance and protection features. In this article, we will explain what 1200p60 ???? ??????? ????? is, how it works, and what are its main advantages.
1200p60
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What is 1200p60 ???? ??????? ??????
1200p60 ???? ??????? ????? is a product name of a PWM current-mode controller designed by ON Semiconductor. PWM stands for pulse-width modulation, which is a technique that controls the amount of power delivered to a load by switching the output voltage on and off at a fixed frequency. Current-mode control means that the output current is sensed and compared to a reference value to adjust the duty cycle of the PWM signal. This way, the output voltage can be regulated and the current can be limited.
1200p60 ???? ??????? ????? is housed in a SOIC-8 or PDIP-8 package and operates at a fixed frequency of 40 kHz, 60 kHz, or 100 kHz. It can drive low gate-charge switching devices like an IGBT or a MOSFET, which reduces the operating power and improves the efficiency. It also has an integrated output short-circuit protection that shuts down the controller in case of an overload or a short.
How Does 1200p60 ???? ??????? ????? Work?
1200p60 ???? ??????? ????? works by using a novel concept that allows it to implement a complete offline battery charger or a standby SMPS with few external components. It does not need an auxiliary winding to supply itself from the DC rail, which simplifies the design and ensures operation in presence of low output voltage or shorts. It also uses current-mode control with skip-cycle capability and frequency jittering to achieve high performance and low noise.
The basic operation of 1200p60 ???? ??????? ????? can be summarized as follows:
The controller senses the output current through a sense resistor and compares it to an internal reference voltage.
If the current is lower than the reference, the controller turns on the switching device and delivers power to the load.
If the current reaches or exceeds the reference, the controller turns off the switching device and stops delivering power to the load.
This process repeats at a fixed frequency, resulting in a PWM output voltage that can be filtered by a capacitor to obtain a smooth DC output voltage.
If the output power demand diminishes, the controller automatically enters the skip cycle mode and skips some cycles to reduce the average output current and improve the efficiency at light loads.
If the output voltage falls below a certain threshold, the controller enters a burst mode and delivers short bursts of power to maintain the output voltage above the minimum level.
If the output is shorted or overloaded, the controller detects an abnormal current level and shuts down itself until the fault is removed.
The controller also incorporates an internal leading edge blanking circuit that filters out noise spikes caused by parasitic capacitance during switching transitions.
The controller also features a built-in frequency jittering circuit that modulates the switching frequency randomly to spread out the electromagnetic interference spectrum and reduce its peak amplitude.
The controller also has an internal temperature shutdown circuit that protects itself from overheating by turning off when the junction temperature exceeds 150C.
What are the Advantages of 1200p60 ???? ??????? ??????
1200p60 ???? ??????? ????? offers several advantages over conventional PWM controllers for switchmode power supplies. Some of these advantages are:
It does not need an auxiliary winding operation, which reduces the number of components and simplifies the design.
It has an internal output short-circuit protection, which enhances safety and reliability.
It has extremely low no-load standby power consumption, which saves energy and meets green standards.
It has current-mode control with skip-cycle capability, which provides fast transient response and high efficiency at light loads.
It has internal leading edge blanking, which eliminates noise spikes and improves stability.
It has built-in frequency jittering, which lowers EMI emissions and reduces filtering requirements.
It has SPICE models available for transient and AC analysis, which facilitates simulation and design optimization.
It has internal temperature shutdown, which prevents thermal damage.
Conclusion
1200p60 ???? ??????? ????? is a PWM current-mode controller for low-power universal off-line supplies that offers a novel solution for switchmode power supplies. It can operate without an auxiliary winding and provide excellent performance and protection features. It can be used for various applications such as AC-DC adapters, offline battery chargers, auxiliary/ancillary power supplies (USB, appliances, TVs, etc.). If you are interested in learning more about 1200p60 ???? ??????? ????? or other semiconductor products from ON Semiconductor, please visit their website at http://www.onsemi.com.
How to Use 1200p60 ???? ??????? ????? for Your Switchmode Power Supplies?
If you want to use 1200p60 ???? ??????? ????? for your switchmode power supplies, you will need to follow some basic steps and guidelines. Here are some tips to help you get started:
Choose the appropriate version of 1200p60 ???? ??????? ????? according to your desired switching frequency. There are three versions available: NCP1200P40, NCP1200P60, and NCP1200P100, which operate at 40 kHz, 60 kHz, and 100 kHz respectively.
Select a suitable switching device that can handle the required voltage and current ratings. You can use an IGBT or a MOSFET with low gate-charge and low on-resistance.
Connect the output of 1200p60 ???? ??????? ????? to the gate of the switching device through a gate resistor. The gate resistor should be chosen to limit the peak current and provide adequate damping.
Connect a sense resistor between the source of the switching device and the ground. The sense resistor should be chosen to set the maximum output current limit. The typical value of the sense resistor is 0.33 ohm.
Connect a snubber circuit across the drain and source of the switching device to suppress voltage spikes and ringing. The snubber circuit can consist of a resistor and a capacitor in series.
Connect an output filter capacitor between the output voltage and the ground. The output filter capacitor should be chosen to provide sufficient ripple voltage and hold-up time.
Connect an optocoupler between the feedback pin of 1200p60 ???? ??????? ????? and the output voltage divider. The optocoupler should be chosen to provide adequate isolation and transfer ratio.
Connect a feedback resistor and a zener diode in series between the output voltage and the ground. The feedback resistor and the zener diode should be chosen to set the output voltage regulation point.
Connect a compensation network between the feedback pin of 1200p60 ???? ??????? ????? and the ground. The compensation network can consist of a resistor and a capacitor in parallel. The compensation network should be chosen to provide adequate loop stability and transient response.
Connect a bypass capacitor between the VCC pin of 1200p60 ???? ??????? ????? and the ground. The bypass capacitor should be chosen to provide sufficient decoupling and noise filtering.
What are Some Applications of 1200p60 ???? ??????? ??????
1200p60 ???? ??????? ????? can be used for various applications that require low-power, cost-effective, and reliable switchmode power supplies. Some examples of these applications are:
AC-DC Adapters: You can use 1200p60 ???? ??????? ????? to design a simple and compact AC-DC adapter that can convert AC mains voltage to a regulated DC output voltage. You can use a flyback topology or a buck topology depending on your input and output specifications.
Offline Battery Chargers: You can use 1200p60 ???? ??????? ????? to design an efficient and safe offline battery charger that can charge different types of batteries from AC mains voltage. You can use a flyback topology or a forward topology depending on your battery characteristics.
Auxiliary/Ancillary Power Supplies: You can use 1200p60 ???? ??????? ????? to design an auxiliary or ancillary power supply that can provide low-power DC output voltages for various devices such as USB ports, appliances, TVs, etc. You can use a flyback topology or a buck topology depending on your load requirements.
Conclusion
1200p60 ???? ??????? ????? is a PWM current-mode controller for low-power universal off-line supplies that offers a novel solution for switchmode power supplies. It can operate without an auxiliary winding and provide excellent performance and protection features. It can be used for various applications such as AC-DC adapters, offline battery chargers, auxiliary/ancillary power supplies (USB, appliances, TVs, etc.). If you are interested in learning more about 1200p60 ???? ??????? ????? or other semiconductor products from ON Semiconductor, please visit their website at http://www.onsemi.com.
How to Choose the Right Components for Your 1200p60 ???? ??????? ????? Circuit?
When designing a switchmode power supply using 1200p60 ???? ??????? ?????, you will need to choose the right components that can meet your specifications and requirements. Here are some factors that you should consider when selecting the components:
Input Voltage Range: You should choose a switching device that can withstand the maximum input voltage that your circuit will encounter. You should also consider the voltage spikes and surges that may occur during switching transitions or line disturbances.
Output Voltage and Current: You should choose a switching device that can handle the maximum output voltage and current that your load will demand. You should also consider the power dissipation and thermal management of the switching device.
Switching Frequency: You should choose a switching device that has a low gate-charge and a fast switching speed to reduce the switching losses and improve the efficiency. You should also choose a sense resistor, a gate resistor, a snubber circuit, and an output filter capacitor that are compatible with your chosen switching frequency.
Feedback and Compensation: You should choose an optocoupler, a feedback resistor, a zener diode, and a compensation network that can provide adequate isolation, transfer ratio, regulation point, loop stability, and transient response for your circuit.
Bypass and Decoupling: You should choose a bypass capacitor that can provide sufficient decoupling and noise filtering for 1200p60 ???? ??????? ?????. You should also choose other decoupling capacitors for your input and output rails as needed.
What are Some Design Tips and Tricks for Using 1200p60 ???? ??????? ??????
If you want to optimize your switchmode power supply design using 1200p60 ???? ??????? ?????, you can follow some design tips and tricks that can help you achieve better performance and reliability. Here are some of them:
Use a soft-start circuit to limit the inrush current and prevent overshoot during startup.
Use a brown-out detection circuit to prevent false triggering or malfunctioning when the input voltage is too low.
Use a current limit foldback circuit to reduce the output current when the output voltage is too low or shorted.
Use an overvoltage protection circuit to protect your load from excessive output voltage due to feedback failure or other faults.
Use an undervoltage lockout circuit to disable 1200p60 ???? ??????? ????? when the input voltage is too low or absent.
Use an overtemperature protection circuit to protect 1200p60 ???? ??????? ????? from overheating due to excessive power dissipation or ambient temperature.
Use proper PCB layout techniques to minimize parasitic inductance and capacitance, reduce EMI emissions and susceptibility, and improve heat dissipation.
Conclusion
1200p60 ???? ??????? ????? is a PWM current-mode controller for low-power universal off-line supplies that offers a novel solution for switchmode power supplies. It can operate without an auxiliary winding and provide excellent performance and protection features. It can be used for various applications such as AC-DC adapters, offline battery chargers, auxiliary/ancillary power supplies (USB, appliances, TVs, etc.). If you are interested in learning more about 1200p60 ???? ??????? ????? or other semiconductor products from ON Semiconductor, please visit their website at http://www.onsemi.com.
Conclusion
1200p60 ???? ??????? ????? is a PWM current-mode controller for low-power universal off-line supplies that offers a novel solution for switchmode power supplies. It can operate without an auxiliary winding and provide excellent performance and protection features. It can be used for various applications such as AC-DC adapters, offline battery chargers, auxiliary/ancillary power supplies (USB, appliances, TVs, etc.). If you are interested in learning more about 1200p60 ???? ??????? ????? or other semiconductor products from ON Semiconductor, please visit their website at http://www.onsemi.com. ca3e7ad8fd