Overview
The L6569D, produced by STMicroelectronics, is a high-voltage half-bridge driver IC designed for applications in electronic lamp ballasts, particularly for compact fluorescent lamps (CFLs) and other high-voltage lighting systems. This IC integrates a symmetric half-bridge inverter driver, an oscillator, and a high-voltage level shifter, making it a comprehensive solution for driving MOSFETs in high-voltage applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-DIP (0.300", 7.62mm), 8-SOIC |
| Driven Configuration | Half-Bridge |
| Channel Type | Synchronous |
| Number of Drivers | 2 |
| Gate Type | IGBT, N-Channel MOSFET |
| Voltage - Supply | 10 V ~ 16.6 V |
| Current - Peak Output (Source, Sink) | 170mA, 270mA |
| High Side Voltage - Max (Bootstrap) | 600V |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Mounting Type | Through Hole |
Key Features
- Integrated Oscillator: Operates from 25 kHz to 150 kHz with a +/-5% maximum tolerance, similar to a CMOS 555 timer.
- High Voltage Level Shifter: Realized in BCD offline technology, allowing the upper MOSFET buffer to be driven through a 600V level shifter.
- Dead Time Circuit: Built-in dead time of 1.25 µs to prevent cross conduction and ensure safe switching of the MOSFETs.
- Under Voltage Lock Out (UVLO): With a 9V threshold and 1V hysteresis, ensuring the IC operates only when the supply voltage is within safe limits.
- Internal Shunt Regulator: A 15V shunt regulator with low startup current of 150 µA.
- Bootstrap Capacitor Charging: Integrates a high-voltage lateral DMOS transistor to charge the bootstrap capacitor for the upper buffer.
Applications
The L6569D is primarily used in compact fluorescent lamp (CFL) ballasts and other electronic lamp ballast applications. It can also be used in low-voltage halogen lamp transformers and in industrial lighting systems that require complex control, such as dimming or automation interfaces.
For applications requiring higher power (above 150W), the L6569D can be used to drive a full bridge inverter configuration, with one IC acting as the master and the other as the slave.
Q & A
- What is the primary application of the L6569D IC?
The primary application of the L6569D IC is in compact fluorescent lamp (CFL) ballasts.
- What is the operating frequency range of the integrated oscillator in the L6569D?
The integrated oscillator operates from 25 kHz to 150 kHz.
- What is the maximum high side voltage (bootstrap) of the L6569D?
The maximum high side voltage (bootstrap) is 600V.
- What is the purpose of the built-in dead time circuit in the L6569D?
The built-in dead time circuit prevents cross conduction between the MOSFETs by delaying the turn-on of the opposite transistor for 1.25 µs.
- What is the under voltage lock out (UVLO) threshold of the L6569D?
The UVLO threshold is 9V with a 1V hysteresis.
- How does the L6569D charge the bootstrap capacitor for the upper buffer?
The L6569D integrates a high-voltage lateral DMOS transistor to charge the bootstrap capacitor for the upper buffer.
- What is the startup current of the L6569D?
The startup current is 150 µA.
- Can the L6569D be used in full bridge inverter configurations?
Yes, the L6569D can be used to drive a full bridge inverter configuration, with one IC acting as the master and the other as the slave.
- What is the operating temperature range of the L6569D?
The operating temperature range is -40°C to 150°C (TJ).
- What type of MOSFETs can the L6569D drive?
The L6569D can drive IGBT and N-Channel MOSFETs, typically those in TO220 packages.
