KF6020
AEC-Q100 qualified constant current LED driver with 60V input and 1A output for automotive lighting
Product Overview
Description
The KF6020 is a high-performance constant current LED driver designed for automotive lighting applications. It features AEC-Q100 qualification and wide input voltage range for flexible automotive system integration.
This driver supports input voltages up to 60V with 1A constant current output. The integrated power MOSFET and current sensing provide accurate LED current regulation with ±3% accuracy.
Advanced features include PWM dimming input, thermal foldback protection, and LED open/short detection. The KF6020 is suitable for interior lighting, exterior lighting, and dashboard backlight applications.
Product Series
KF
Primary Application
Interior lighting
Key Features
- AEC-Q100 qualified
- Wide input voltage 6V-60V
- High efficiency up to 95%
- PWM dimming control
- Thermal foldback protection
- LED fault detection
Specifications
| Input Voltage | 6V-60V |
|---|---|
| Output Current | Up to 1A |
| Current Accuracy | ±3% |
| Switching Frequency | 1MHz |
| Efficiency | Up to 95% |
| Dimming Range | 1%-100% |
| Temperature Range | -40°C to +125°C |
| Package | ESOP-8 |
Applications
Interior lighting
Electronic system design
Exterior lighting
Electronic system design
Dashboard backlight
Electronic system design
Daytime running lights
Electronic system design
Turn signal lights
Sensor signal conditioning
FAE Expert Insights
"The KF6020 is an excellent LED driver for automotive lighting applications. The wide 6V-60V input range handles both 12V and 24V automotive systems with margin for load dump conditions. In my experience with automotive lighting designs, the 1MHz switching frequency allows for compact inductor selection while maintaining good efficiency. The PWM dimming interface integrates easily with vehicle lighting controllers. I particularly appreciate the thermal foldback feature which protects the LEDs and driver during thermal stress. The fault detection capabilities simplify system diagnostics. For automotive lighting requiring high reliability, this driver provides excellent performance."
High-efficiency LED driver with wide input range for automotive lighting
— James Zhang, BeiLuo
Frequently Asked Questions
What is the maximum LED string voltage for KF6020?
The maximum LED string voltage is approximately 0.9 × Vin (accounting for driver headroom). With 60V maximum input, the LED string can be up to approximately 54V. This supports long LED strings for high-power applications. For example, with 3V per LED, up to 18 LEDs can be driven in series. Higher input voltages allow longer LED strings, reducing current requirements and wiring losses. Always verify actual LED forward voltage at operating current.
Calculate LED string voltage based on your LED configuration. Contact LiTong for LED driver design support.
How does the PWM dimming work on KF6020?
The KF6020 PWM dimming input accepts logic-level PWM signals (typically 3.3V or 5V) to control LED brightness. The PWM frequency can range from 100Hz to 20kHz, with duty cycle determining brightness (0% = off, 100% = full brightness). The driver maintains constant current during the on-time, ensuring consistent LED color temperature. For flicker-free operation, use PWM frequencies above 100Hz. The dimming range is typically 1% to 100%, with some devices supporting extended range down to 0.1%.
Use PWM frequencies above 100Hz to avoid visible flicker. Contact LiTong for dimming circuit design.
What is the efficiency of KF6020 at different loads?
The KF6020 achieves peak efficiency of 95% at moderate to high loads (50-100% of rated current). Efficiency depends on input voltage, output voltage, and load current. At light loads (<20%), efficiency drops due to quiescent current and switching losses. At very high loads, conduction losses in the MOSFET and inductor reduce efficiency. For optimal efficiency, operate in the 50-80% load range. The 1MHz switching frequency provides good balance between efficiency and component size.
Design for 50-80% load range for optimal efficiency. Contact LiTong for efficiency optimization.
How do I design the inductor for KF6020?
Inductor selection for KF6020 involves calculating inductance based on input voltage, output voltage, and ripple current. Typical inductance is 10-47μH depending on operating conditions. Key considerations: 1) Inductance value - higher reduces ripple but increases size, 2) Current rating - must exceed peak inductor current, 3) DCR - lower reduces conduction losses, 4) Core material - ferrite for high frequency. Use shielded inductors for EMI-sensitive applications. ChipON provides reference designs with recommended inductor specifications.
Use reference design inductor values or contact LiTong for custom inductor selection.
What thermal management is required for KF6020?
The KF6020 thermal management depends on power dissipation and ambient temperature. Power dissipation is approximately P = Vout × Iout × (1 - Efficiency). With 95% efficiency, dissipation is 5% of output power. The ESOP-8 package has exposed pad for heat dissipation. Recommendations: connect exposed pad to large copper area, use thermal vias to inner layers, and maintain adequate spacing from heat-sensitive components. For high-power applications, verify junction temperature stays below 125°C under worst-case conditions.
Calculate thermal performance for your operating conditions. Contact LiTong for thermal design support.