Small and medium-sized switching power supply controller NCL30000 - Power Circuit - Circuit Diagram

The NCL30000 is a small to medium-sized switching power supply controller for single-stage PFC LED drivers. NCL30000 has a very low starting current of 24uA, operating current is only 2mA, can be current-protected cycle by cycle, can provide 500mA current source, mainly used in LED drive power, commercial and residential LED decorative lighting, PFC constant voltage power supply. This article describes the main features of the NCL30000, block diagrams, simplified application block diagrams, and simplified flyback application block diagrams, as well as the NCL30000LED2GEVB evaluation board circuit diagram and bill of materials (BOM). 

The NCL30000 is a switch mode power supply controller intended for low to medium power single stage power factor (PF) corrected LED Drivers. The device is designed to operate in critical conduction mode (CrM) and is suitable for flyback as well as buck topologies.

</ br> <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> In CrM, the switching frequency will vary with line and load and switching losses are low as recovery losses in the output rectifier are negligible since the current goes to zero prior to reactivating the main MOSFET switch.

The device features a programmable on time limiter, zero current detect sense block, gate driver, trans−conductance error amplifier as well as all PWM control circuitry and protection functions required to implement a CrM switch mode power supply. Device features low startup current enabling fast, low loss charging of the VCC capacitor. The current sense protection threshold has been set at 500 mV to minimize power dissipation in the external sense resistor. To support the environmental operation range of Solid State Lighting, the device Is specified across a wide junction temperature range of −40 C to 125 C.

Main features of NCL30000:

Very Low 24 uA Typical Startup Current

Constant On Time PWM Control

Cycle−by−Cycle Current Protection

Low Current Sense Threshold of 500 mV

Low 2 mA Typical Operating Current

Source 500 mA / Sink 800 mA Totem Pole Gate Driver

Reference Design for TRIAC and Trailing Edge Line Dimmers

Wide Operating Temperature Range

No Input Voltage Sensing Requirement

Enable Function and Overvoltage Protection

These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant NCL30000 Typical Applications:

LED Driver Power Supplies

LED Based Down Lights

Commercial and Residential LED Fixtures

TRIAC Dimmable LED Based PAR Lamps

Power Factor Corrected Constant Voltage Supplies


figure 1. NCL30000 block diagram

figure 2. Simplify the NCL30000 application block diagram