Part Number: L6599DTR

Manufacturer: STMicroelectronics


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of L6599DTR

Datasheet  L6599DTR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Power Supply Controllers, Monitors
Manufacturer STMicroelectronics
Packaging Tape & Reel (TR)
Part Status Active
Applications Resonant Converter Controller
Voltage – Input
Voltage – Supply 8.85 V ~ 16 V
Current – Supply 3.5mA
Operating Temperature 0°C ~ 105°C
Mounting Type Surface Mount
Package / Case 16-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 16-SO


The L6599DTR is a power supply controller and resonant converter controller in a 16-SO package. It is a versatile and highly efficient device used in various applications, including switch-mode power supplies (SMPS) and resonant converters. This guide aims to provide a comprehensive overview of the L6599DTR, its features, working principles, application areas, and key considerations for its implementation.

What is L6599DTR?

The L6599DTR is a power supply controller and resonant converter controller that is very flexible and works well. It is made to be used in switch-mode power sources (SMPS) and resonant converters. The L6599DTR combines a number of important features that are needed for resonant converters. This makes it a popular choice for designers in a wide range of applications.

L6599DTR Key Features and Functions

The L6599DTR combines an oscillator and offers PWM-generating capabilities, both of which are necessary for managing the power stage in resonant converters. Oscillator and PWM generation’s fundamental characteristics and capabilities include:

Controlling the switching frequency of the oscillator is possible with the L6599DTR by modifying external timing components. With this versatility, designers can tailor the converter’s performance to meet the needs of certain applications.

Duty Cycle Control

The system creates a PWM signal with an adjustable duty cycle, enabling precise control of the on-time and off-time of the power switches. With this control, the output voltage or current in resonant converters can be precisely controlled.

The L6599DTR allows synchronization with an external clock source. Synchronization Capability. When synchronization with an external system or between many converters is necessary, this capability comes in handy.

The L6599DTR offers adaptive control techniques, which improve the effectiveness and performance of resonant converters. With the aid of these strategies, the converter is able to dynamically modify its operational settings in response to load conditions. Important adaptive control characteristics are:

Frequency Foldback

By lowering the switching frequency at low loads, this approach decreases switching losses and boosts effectiveness. In low-load or no-load situations, it aids in maintaining stable operation.

Frequency Modulation

The L6599DTR enables more precise control of the converter’s behavior, particularly under transient load conditions, by modulating the switching frequency around a predetermined value. With this modulation, output voltage or current fluctuations are kept to a minimum, and stability is maintained.

Protective methods

The L6599DTR features a number of protective methods to guarantee a secure and dependable operation. In the event of a problem, these devices aid in preventing harm to the converter and its parts. Important security attributes include:

  • The L6599DTR monitors the output voltage and engages a protection mechanism if the voltage rises above a set limit. This is known as overvoltage protection (OVP). Through this safeguard, excessive voltage levels that can harm the load or other components are prevented.
  • Overcurrent Protection (OCP): To identify high output currents, the device has current sensing and monitoring capabilities. The protective system activates in the case of an overcurrent condition to safeguard the converter and the attached load.
  • Thermal shutdown: The L6599DTR has a thermal protection circuit that continuously checks the temperature of the component. The thermal shutdown mechanism engages if the temperature rises above a safe level, stopping overheating and potential damage.

These safeguards improve the resonant converter system’s dependability and security by shielding it from erroneous operating circumstances and probable malfunctions.

The L6599DTR is a strong and adaptable power supply controller for resonant converters, ensuring effective operation, accurate control, and system protection through the combination of oscillator and PWM generation, adaptive control approaches, and protective mechanisms.

Working Principle

Resonant Converter Basics

A resonant converter is a kind of power converter that effectively converts power by using resonant parts like inductors and capacitors. Resonant converters work on the basic premise of operating the power switches at high frequencies while utilizing the energy storage and release properties of the resonant components.

Energy is transferred from the input to the output during the high-frequency oscillation phases of a resonant converter. To guarantee effective energy transfer, the switching of power devices—typically MOSFETs—is synced with the resonance frequency.

Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS): These techniques, used in resonant converters to reduce switching losses and increase overall efficiency, are known as zero voltage switching (ZVS) and zero current switching (ZCS).

When a power switch is turned on or off, the voltage across it drops to zero, which is referred to as ZVS. This makes power transfer more seamless and lowers the switching losses linked to voltage transitions.

ZCS, on the other hand, makes sure that during switching transitions, the current flowing through the power switch decreases to zero. By achieving ZCS, switching losses brought on by changes in current are reduced, further increasing efficiency.

Role of L6599DTR in Resonant Converters

In the implementation of resonant converters, the L6599DTR is an essential power supply controller and resonant converter controller. Its primary duties consist of:

● Oscillator and PWM Generation

The L6599DTR incorporates an oscillator that produces the power stage’s switching frequency. It offers precise timing signals for power MOSFET driving. Additionally, it produces a Pulse-Width Modulation (PWM) signal that regulates the output voltage or current by controlling the duty cycle of the power switches.

● Drive and Control

The L6599DTR has a high-voltage gate driver that can supply high current and voltage levels to power MOSFETs. It provides the necessary control signals to maintain ZVS and ZCS conditions and assures effective switching transitions with little loss.

Frequency Foldback and Frequency Modulation are two adaptive control methods that are supported by the L6599DTR. To maximize efficiency and reduce undue strain on components, these systems dynamically alter the switching frequency based on load circumstances.

● Protection Mechanisms

To protect the converter and its components, the L6599DTR includes a number of protection features. These ensure dependable and secure operation and include Overvoltage Protection (OVP), Overcurrent Protection (OCP), and Thermal Shutdown.

The L6599DTR allows designers to create resonant converters that are effective and dependable, with lower switching losses, better power transfer, and higher overall performance. By streamlining the design process and enabling the use of cutting-edge control strategies, the controller produces a highly efficient power conversion.

Frequently asked questions about L6599DTR

● What is the L6599DTR used for?

The L6599DTR is a power supply controller and resonant converter controller. It is primarily utilized in resonant converters and switch-mode power supplies (SMPS). It offers regulation and control capabilities, enabling effective power conversion.

● Can the L6599DTR be used with various power switch types?

Yes, a variety of power switches, including MOSFETs and IGBTs, can be utilized with the L6599DTR. It offers a high-voltage gate driver that can operate these power devices at high levels of current and voltage.

● How do I choose the proper external timing elements for the oscillator frequency control of the L6599DTR?

For calculating the values of external timing components, such as resistors and capacitors, to determine the required oscillator frequency, the L6599DTR datasheet gives thorough instructions and formulas. Calculations should take into account design factors including the intended switching frequency, component tolerances, and stability requirements.

● Is it possible to synchronize the L6599DTR with an outside clock source?

Yes, the L6599DTR supports synchronization with an external clock source. With the help of this capability, you may synchronize your converter with other converters or external systems to ensure smooth system integration and coordinated operation.


Introducing the L6599DTR, a powerful and versatile power supply controller for resonant converters. With precise control over switching frequency and duty cycle, adaptive control techniques, and robust protection mechanisms, this controller offers exceptional performance. Its high-voltage startup, wide input voltage range, and remarkable efficiency make it ideal for a wide range of applications. Moreover, the manufacturer provides comprehensive documentation to facilitate implementation and optimization.

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