Preface
A PWM controller, also known as a pulse-width modulation controller, is a very efficient technology for precise control of analog circuits through the digital output of a microprocessor. This control is extremely efficient in the field of analog circuits, as it adjusts the gate or base bias of the transistor in response to changes in load. This process enables precise regulation of the output transistor or transistor on-time of the switched-regulated power supply to effectively control the power output.
Therefore, it is widely used in the control of various power supply topologies, including flyback, boost, push-pull, forward and buck. It supports a wide range of topologies, giving designers the flexibility to create a wide variety of power supply designs. These controllers are particularly suitable for DC/DC and AC/DC power conversion circuits in a wide range of end equipment, providing an efficient and reliable power management solution.
PTM PWM controller chip
The charging head network summarizes a number of PWM controller chips launched by Lishengmei, and summarizes them into the following table, which introduces the specific models and related characteristics of these chips in detail.
Lik Sang Mei LN9T27GDH
Lik Sang Mei LN9T27GDH is a switching power supply chip with a built-in 680V switch tube, which adopts current mode control, which has the advantages of low standby power consumption, low cost and high performance.
The chip's standby power consumption is as low as 50mW, the built-in soft-start circuit can reduce switching shock, the enhanced light-load control optimizes conversion efficiency, the chip has a built-in cycle-by-cycle current limit, supports output overcurrent, overload, and short-circuit protection, and supports 45W power output.
力生美 LN9T27GDH 详细资料。
Lik Sang Mei LN9T33HV
Lik Sang Mei LN9T33HV is a high-performance AC/DC switching power supply PWM power switch that supports up to 75V power supply, designed for PD/QC and other output change systems, built-in high-voltage MOSFET wide VCC voltage power supply high-power switching power chip, built-in 650V MOSFET high-voltage power switch, can work under the wide grid voltage conditions of 85~265Vac, to meet the requirements of global power grid applications.
LN9T33HV meet the energy efficiency requirements of DoE6 and CoC V5, the no-load standby power consumption can be as low as less than 50mW, the built-in soft-start control circuit reduces the impact of power-on/off, the built-in second-generation C.Y. ™ technology optimizes EMI performance, the built-in oscillator and has a maximum frequency limit of 65KHz.
LN9T33HV also provides a very complete protection circuit with automatic recovery function, including cycle-by-cycle current limit, output overload protection with high and low voltage compensation, VDD over-voltage protection and under-voltage lockout function, output over-voltage accurate protection function and input under-voltage function when feedback is open loop can be externally set. It adopts the TSIP7 packaging form independently developed by Lishengmei Semiconductor, which is small in size and easy to install and dissipate.
Lik Sang Mei LN3C61AF
LN3C61AF is a high-performance, highly integrated PWM controller chip that supports 9~40V operating voltage, making it easy to build low-standby, low-cost, high-performance solutions and meet the efficiency standards of CoC V5 and DoE LEVEL VI with less than 500W power.
The maximum switching frequency of the LN3C61AF is up to 130kHz, allowing the use of relatively small transformer sizes to complete the design. Very low switching losses in full-valley switching mode, low standby power consumption, high energy efficiency, low-frequency cranking characteristics control optimized starting performance, and highly reliable low-EMI gate drivers with soft clamps.
LN3C61AF very small dead-time control enables the system to operate in near-critical conduction mode to improve transformer utilization, which is superior to traditional SSR/SR controller architectures. The operation of PWM/PFM/PBM mode multi-segment curve control mode further optimizes the conversion efficiency of the system under different loads, especially under the light load conversion efficiency, the peak current threshold will be automatically locked under the light load condition to maintain effective conversion, the segmented modulation design makes the system have high conversion efficiency while effectively avoiding audible noise, and the standby power consumption can be as low as 50mW.
Lik Sang Mei LN3C66A
LN3C66A is a high-performance, highly integrated current-mode PWM controller. The chip has a built-in peak load power control function, which can easily build a large peak load up to 2~10 times, low standby power consumption, low cost, high performance solution, and meet the energy efficiency requirements of CoC V5 and DoE LEVEL VI with less than 200W or higher power.
The PWM switching frequency is set internally by the chip and is fully temperature compensated. In QR mode, the maximum PWM switching frequency is set to 77 kHz, which can reach 130 kHz at peak loads. The IC can operate in QR valley switching and smart burst mode to reduce switching losses under no-load or light-load conditions, resulting in good conversion efficiency with low standby power consumption. The low start-up and operating currents of VDD can make the LN3C66A have very high reliability and service life, and the circuit can be started with a large value of resistor, which reduces the loss of power consumption.
Lik Sang Mei LN3C69A
LN3C69A is a high-performance, highly integrated current-mode PWM controller with high-voltage start-up. It is easy to build a low-standby-power, low-cost, high-performance solution that meets the efficiency requirements of CoC V5 and DoE LEVEL V at less than 200W or higher.
The PWM switching frequency is set internally by the chip and is fully temperature compensated. The maximum PWM switching frequency is set to 77 kHz in OR mode and can reach 130 kHz at peak load. The IC can operate in OR valley switching and smart burst mode to reduce switching losses under no-load or light-load conditions, resulting in good conversion efficiency while having low standby power consumption. VDD's low starting current and operating current can make the LN3C69A have very high reliability and service life, and a larger value of resistance can be used to complete the starting circuit, thereby reducing the loss of starting resistance and further reducing the standby power consumption of the system.
Summary of the charging head network
A number of primary PWM controller series launched by PTM demonstrate its strong capabilities in power management technology. These chips feature intelligent digital power control with very low power consumption, multiple modes of operation such as burst mode, pulse frequency modulation, and continuous conduction mode to provide efficient power regulation, as well as built-in features such as Vcc self-holding, frequency jitter technology for improved EMI performance, and adaptive MOSFET gate drive. In addition, these chips include comprehensive protection mechanisms, such as overload protection, transformer saturation protection and over-temperature protection, to ensure the safety and reliability of the system, providing an efficient, stable and reliable power supply solution for various electronic devices.