NCL30100: Fixed Off Time Switched Mode LED Driver Controller
The NCL30100 is a compact switching regulator controller intended for space constrained constant current high-brightness LED driver applications where efficiency and small size are important. The controller is based on a peak current, quasi fixed-off time control architecture optimized for continuous conduction mode step-down (buck) operation. This allows the output filter capacitor to be eliminated. In this configuration, a reverse buck topology is used to control a cost effective N-type MOSFET. Moreover, this controller employs negative current sensing thus minimizing power dissipation in the current sense resistor. The off time is user adjustable through the selection of a small external capacitor, thus allowing the design to be optimized for a given switching frequency range. The control loop is designed to operate up to 700 kHz allowing the designer the flexibility to use a very small inductor for space constrained applications.
The device has been optimized to provide a flexible inductive step-down converter to drive one or more high power LED(s). The controller can also be used to implement non-isolated buck-boost driver topologies.
- Quasi-Fixed OFF Time, Peak Current Control Method
- N-FET Based Controller Architecture
- Up to 700 kHz Switching Frequency
- Up to >95% Efficiency
- No Output Capacitor Needed
- VCC Operation from 6.35 - 18 V
- Adjustable Current Limit with Negative Sensing
- Inherent Open LED Protected
- Very Low Current Consumption at Startup
- Undervoltage Lockout
- Compact Thin TSOP-6 Pb-Free Package
- -40 to + 125°C Operating Temperature Range
- This is a Pb-Free Device
- Low Voltage Halogen LED Replacement (MR 16)
- LED Track Lighting
- Landscape Lighting
- Solar LED Applications
- Transportation Lighting
- 12 V LED Bulb Replacement
- Outdoor Area Lighting
- LED Light Bars
This demo board illustrates the NCL30100 in a form factor suitable to be embedded in the base of an MR16 LED light bulb. In this case the dual sided PCB incorporates a low voltage AC rectifier bridge so that it can accept the 12 Vac input commonly used in MR16 applications.
This demo board illustrates the NCL30100 in a single-sided PCB layout. The board does have a low voltage AC bridge rectifier to support applications like outdoor landscape lighting and low voltage track lighting applications. The demo board has been designed to accept a PWM input to allow evaluation of the device for applications that need digital dimming.
|Part Number||# of Outputs||Current||Voltage In||Voltage Out|
|NCL30100||1||0||6.35V - 18V||0V|