Overview
The L6599ATD is an improved revision of the previous L6599A, designed by STMicroelectronics. It is a double-ended controller specifically tailored for series-resonant half bridge topology. This controller provides a 50% complementary duty cycle, where the high-side and low-side switches are driven ON/OFF 180° out-of-phase for exactly the same time. Output voltage regulation is achieved by modulating the operating frequency, and a fixed deadtime ensures soft-switching and high-frequency operation. The IC incorporates a high voltage floating structure to drive the high-side switch using the bootstrap approach, and it includes a synchronous-driven high voltage DMOS to replace the external fast-recovery bootstrap diode.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency | Up to 500 kHz | kHz |
| IC Supply Voltage (Vcc) | 8.85 - 16 V | V |
| Turn-on Threshold (VccOn) | 10 - 11.4 V | V |
| Turn-off Threshold (VccOff) | 7.45 - 8.85 V | V |
| High-Side Gate Driver Current | -300/700 mA | mA |
| Low-Side Gate Driver Current | -300/700 mA | mA |
| Operating Temperature Range | -40 to 150 °C | °C |
| Storage Temperature Range | -55 to 150 °C | °C |
| Package | SO-16 | |
| RoHS Compliance Grade | Ecopack2 |
Key Features
- 50% duty cycle, variable frequency control of resonant half bridge
- High accuracy oscillator
- Up to 500 kHz operating frequency
- Two-level Overcurrent Protection (OCP): frequency-shift and latched shutdown
- Interface with PFC controller
- Latched disable input
- Burst mode operation at light load
- Input for power-ON/OFF sequencing or brownout protection
- Non-linear soft-start for monotonic output voltage rise
- 600 V - rail compatible high-side gate driver with integrated bootstrap diode and high dv/dt immunity
- Guaranteed for extreme temperature ranges
Applications
- LCD and PDP TV
- Desktop PC, entry-level server
- Telecom SMPS
- High efficiency industrial SMPS
- AC-DC adapter, open frame SMPS
Q & A
- What is the primary function of the L6599ATD?
The L6599ATD is a double-ended controller designed for series-resonant half bridge topology, providing 50% complementary duty cycle and variable frequency control for output voltage regulation.
- What is the operating frequency range of the L6599ATD?
The L6599ATD can operate up to 500 kHz.
- How does the L6599ATD protect against overcurrent?
The L6599ATD features two-level Overcurrent Protection (OCP): frequency-shift and latched shutdown.
- What is the purpose of the high-side gate driver in the L6599ATD?
The high-side gate driver is 600 V - rail compatible and includes an integrated bootstrap diode with high dv/dt immunity, allowing for the drive of the high-side switch using the bootstrap approach.
- How does the L6599ATD handle light load conditions?
The L6599ATD enters a controlled burst mode operation at light load, minimizing the converter's input consumption.
- What is the role of the non-linear soft-start feature in the L6599ATD?
The non-linear soft-start feature ensures a monotonic output voltage rise during startup, preventing uncontrolled inrush current and minimizing output voltage overshoots.
- Can the L6599ATD be used in extreme temperature environments?
Yes, the L6599ATD is guaranteed for extreme temperature ranges from -40 to 150 °C.
- What package options are available for the L6599ATD?
The L6599ATD is available in the SO-16 package.
- Is the L6599ATD RoHS compliant?
Yes, the L6599ATD is RoHS compliant with an Ecopack2 grade.
- How does the L6599ATD interface with a PFC controller?
The L6599ATD provides an interface with the PFC controller, enabling the pre-regulator to be switched off during fault conditions or burst mode operation.
