Overview
The L6598D, manufactured by STMicroelectronics, is a high-voltage resonant controller designed using BCD™ offline technology. This device is capable of handling voltage ratings up to 600 V, making it highly suitable for AC/DC adapters and applications where resonant topology is beneficial. The L6598D is intended to drive two power MOSFETs in a classical half-bridge topology. It features a dedicated timing section for setting soft-start time, soft-start frequency, and minimum frequency. Additionally, it includes an error amplifier and two enable inputs, along with an integrated bootstrap diode and Zener clamping on the low voltage supply, which minimizes the need for external components.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Vs) | 10 to Vcl | V |
| High Side Reference (Vout) | -1 to Vboot - Vcl | V |
| Floating Supply Rail (Vboot) | Up to 618 V | V |
| Maximum Switching Frequency | 400 kHz | kHz |
| Driver Current Capability | 250 mA source, 450 mA sink | mA |
| Switching Times (rise/fall) | 80/40 ns with 1 nF load | ns |
| dV/dt Immunity | ±50 V/ns | V/ns |
| Thermal Resistance (RthJA) | 120 °C/W (SO16N), 80 °C/W (DIP16) | °C/W |
| Storage Temperature | -40 to +150 °C | °C |
| Ambient Temperature | -40 to +125 °C | °C |
Key Features
- High voltage rail up to 600 V
- dV/dt immunity ±50 V/ns in full temperature range
- Driver current capability: 250 mA source, 450 mA sink
- Switching times 80/40 ns rise/fall with 1 nF load
- CMOS shutdown input
- Undervoltage lockout
- Soft-start frequency shifting timing
- Sense op amp for closed loop control or protection features
- High accuracy current controlled oscillator
- Integrated bootstrap diode
- Clamping on Vs
- Available in DIP16 and SO16 packages
Applications
The L6598D is particularly suited for AC/DC adapters and any application where a resonant topology is beneficial. Its high voltage capabilities and integrated features make it an ideal choice for power supply designs that require efficient and reliable operation. It is also useful in industrial and consumer electronics where high voltage and resonant control are necessary.
Q & A
- What is the maximum voltage rating of the L6598D?
The L6598D has a maximum voltage rating of up to 600 V. - What is the driver current capability of the L6598D?
The driver current capability is 250 mA source and 450 mA sink. - What are the switching times of the L6598D with a 1 nF load?
The switching times are 80 ns rise and 40 ns fall with a 1 nF load. - Does the L6598D have integrated protection features?
Yes, it includes undervoltage lockout, CMOS shutdown input, and comparators for protection schemes. - What is the purpose of the soft-start frequency shifting timing in the L6598D?
The soft-start feature allows the switching frequency to shift from a start frequency to a minimum frequency during a specified time, helping in smooth startup and reducing stress on the power devices. - How does the integrated bootstrap diode work in the L6598D?
The integrated bootstrap diode is part of a bootstrap circuitry that supplies the high voltage section without the need for an external high voltage fast recovery diode. - What are the available package types for the L6598D?
The L6598D is available in DIP16 and SO16 packages. - What is the maximum switching frequency of the L6598D?
The maximum switching frequency is 400 kHz. - Does the L6598D support closed loop control?
Yes, it includes a sense op amp for closed loop control or protection features. - What is the thermal resistance of the L6598D in SO16N and DIP16 packages?
The thermal resistance is 120 °C/W for SO16N and 80 °C/W for DIP16 packages.
