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  4. Microchip — HV96001 Secondary Micro-Interface LED Driver

Microchip — HV96001 Secondary Micro-Interface LED Driver

Microchip

 

Microchip HV96001 Secondary Micro-Interface LED Driver

Handles lighting applications requiring wide dimming capabilities

The Microchip HV96001 is a secondary micro-interface LED driver which targets offline lighting applications requiring wide dimming capability. The driver is capable of linear dimming and PWM dimming, with the PWM dimming capable of flicker-free dimming down to 0.1% level and lower.

The HV96001 is specifically adapted to LED driver designs that accommodate a wide range of the LED load voltage. The device adjusts the output voltage of the AC to DC conversion stage for maintaining a high conversion efficiency over a wide range of the LED load voltage. It also maintains a precise control over the LED current amplitude, thereby maintaining the consistent color temperature.

The adaptability of the device to wide range PWM dimming allows for a stable control of the LED current waveform for PWM dimming pulse widths down to 250 ns.

The HV96001 by Microchip adjusts the flyback converter output voltage such that the boost converter (BC) operates with a small difference between the boost converter input and output voltage, also referred to as the headroom voltage. Operating the boost converter with a small headroom voltage, or, more or less equivalent, operating with a small voltage step-up ratio allows the boost converter to be physically small and operate at a higher efficiency.

The HV96001 includes two feedback regulators, the flyback regulator for control of the flyback output voltage and the boost regulator for control of the LED current amplitude. An optocoupler driver circuit drives the optocoupler, which in turn provides a control signal for driving the control input of the flyback converter.

Features

  • Wide Input Voltage Range: 8V to 60V
  • Linear (Analog) Dimming: with Wide Range of Amplitude Control of the LED Current
  • Pulse Width Modulation (PWM) (Digital) Dimming; Capable of Dimming to Lower than 0.01% with PWM Pulse Width < 150ns
  • Flyback Converter: with Automatic Output Voltage Adjustment for Maintaining High System Efficiency
  • Boost Converter (Sepic Topology) with Near Zero Voltage Ripple for Ripple Free LED Current (100Hz/120Hz Ripple Rejection,) 200kHz Fixed Switching Frequency

 

  • Vdd Regulator with 5V Output, 10mA Load Current Capability
  • Fault Recovery with Auto-retry Delay Set Using Timing Capacitor
  • UVP for Vdd and Flyback Vout
  • OVP for LED Load Voltage (Flyback Vout)
  • OCD for Load Switch Current
  • Stuck-at-Zero Dection of Dimming (DIM) Signal
  • OCP of Output Current with Auto Retry Delay
  • Mixed Dimming Capability Enables Implementation with Wide Range of Dimming Protocols

 

Evaluation Board

The HV96001 Off-Line LED Driver Evaluation Board is fully assembled and tested to evaluate and demonstrate the HV96001 LED driver. In the primary side, the Flyback converter has implemented an active Power Factor Correction (PFC) control algorithm by a PIC controller that commands the switching sequence in such a manner that the input current follows the input voltage envelope.

Package Contents

  • HV96001 Off-Line LED Driver Evaluation Board (ADM01030)
  • Important Information Sheet