60V 1CH Multi-Topology LED Controller - DIA82901
Candidate for：2024 World Electronics Achievement Awards - Power Management/Voltage Converter
The DIA82901 is a multi-topology current mode DC-DC controller that supports Boost, Buck, Buck-Boost, SEPIC and Flyback. Flexible configuration in constant current/voltage and multi-topology make it ideal for automotive front-lighting application. The DIA82901 supports both analog dimming and PWM dimming. In addition to external PWM dimming, embedded PWM dimming is supported, which can save the MCU resource. The device has very low shutdown current by enable function. The switching frequency is adjustable from 100 kHz to 500 kHz or synchronized from 250 kHz to 500 kHz. The EMI performance of DIA82901 can be optimized by spread spectrum modulator. The full diagnostic and protection are integrated, open circuit and short to GND detection, output overvoltage and input undervoltage protection, temperature shutdown. All these faults can be reported by FPWM/FAULT pin. In addition, the soft start function is integrated which limits the inrush current and voltage overshoot at start-up.
Compared to competitors, the DIA82901 has independent ENABLE pin and FAULT pin. Disabling the ENABLE pin when the device is not working can save the power dissipation of system. The independent FAULT pin allows the device to report errors even in PWM dimming state. The DIA82901 also supports the embedded PWM dimming which can achieve PWM dimming without MCU, which is very friendly to cost-sensitive systems.
Features：
a) Wide input voltage range: 4.5 to 60V
b) Output voltage 60V Maximum
c) Switching frequency range: 100k-500kHz
d) Multi-topology: CC&CV for Boost, Buck, Buck-Boost, SEPIC, FLYBACK
e) 15uA low shutdown current
f) Optimized EMC performance:
• Spread spectrum: 7kHz, +/-15%
g) Flexible Dimming
• External PWM Dimming
• Internal PWM Dimming: duty cycle & frequency set by R & C
• Analog Dimming: current set by voltage applied on SET
h) Complete Protection:
• SWO & PWMO OFF: Output OVP, Open load, Short to GND, Open Feedback
• SWO & PWMO OFF, LDO OFF: Over Temp, Input Under voltage
Applications：
• Automotive High/Low Beam
• General illumination
• General DC/DC Controller
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