The driver's output to an external MOSFET This pin is the positive supply of the IC. This pin monitors the primary peak current. A Zener diode can also be used to pull-up the pin and stop the controller for adjustable OVP protection. Typical values ranges from 4.70 mF Connecting an NTC to this pin allows the user to program thermal current foldback threshold and slope. This pin also observes the input voltage rail for: - Power Factor Correction - Valley lockout This pin receives a filtering capacitor for power factor correction.
SMEXOSCOPE ANALOG AC DC DRIVER
This pin observes the input voltage rail and protects the LED driver in case of too low mains conditions (brown-out). 1 2 Pin Name ZCD VS Function Zero Crossing Detection Input Voltage Sensing Pin Description Connected to the auxiliary winding, this pin detects the core reset event. Typical Application Schematic in a Buck-Boost Converter Typical Application Schematic in a Flyback Converterįigure 2. Cycle-by-cycle Peak Current Limit Winding Short Circuit Protection Secondary Diode Short Protection Output Short Circuit Protection Shorted Current Sense Protection User Programmable NTC Based Thermal Foldback Typical Applications Thermal Shutdown Vcc Undervoltage Lockout Integral LED Bulbs and Tubes Brown-out Protection LED Light Engines Pb-Free, Halide-Free Product LED Drivers/Power Supplies Latching-off or 4-s Auto-recovery Electronic Control Gear for LED Lighting (NC元0188B) Protection Modes (See Table 4)įigure 1. Quasi-resonant Peak Current-mode Control Operation PIN CONNECTIONS Constant Current Control with Primary Side Feedback 1 Tight LED Constant Current Regulation of ☒% Typical VCC ZCD Power Factor Correction DRV VS Line Feedforward for Enhanced Regulation Accuracy GND COMP Low Start-up Current (13 mA typ.) CS SD Wide Vcc Range (Top View) 500 mA Totem Pole Driver with 12 V Gate Clamp Robust Protection Features ORDERING INFORMATION OVP on VCC See detailed ordering and shipping information in the package Programmable Over Voltage / LED Open Circuit Protection dimensions section on page 25 of this data sheet.
SMEXOSCOPE ANALOG AC DC CODE
Pin-to-pin compatible to the NC元0088, the NC元0188 provides the same benefits with in addition, an increased resolution of the digital current-control algorithm for a 75% reduction in the LED current quantization ripple.Ĩ 元0188x ALYW 元0188x = Specific Device Code A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb-Free Package To ensure reliable operations at elevated temperatures, a user configurable current foldback circuit is also provided. A robust suite of safety protections is built in to simplify the design. The device is highly integrated with a minimum number of external components. Housed in the SOIC8, the NC元0188 is specifically intended for very compact space-efficient designs. Designed to support flyback, buck-boost, and SEPIC topologies, its proprietary current-control algorithm provides near-unity power factor and tightly regulates a constant LED current from the primary side, thus eliminating the need for a secondary-side feedback circuitry or an optocoupler. The is a controller targeting isolated and non-isolated "smart-dimmable" constant-current LED drivers. NC元0188 Power Factor Corrected Quasi-Resonant Primary Side Current-Mode Controller for LED Lighting with Thermal Foldback
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