AT9933

AT9933 Hysteretic Boost-Buck (Ćuk) LED Driver IC with High-Side Current Sensing Features AEC-Q100 Automotive Qualified, See Product Identification System Constant Current LED Driver Steps Input Voltage Up or Down Low Electromagnetic Interference (EMI) Variable Frequency Operation Internal 75V Linear Regulator Input and Output Current Sensing Input Current Limit Enable and Pulse-width Modulation (PWM) Dimming Ambient Temperature Rating of up to 125°C Applications LED Lighting Applications Package Type General Description The AT9933 is a variable frequency PWM controller IC, designed to control an LED lamp driver using a low-noise boost-buck (Ćuk) topology. It uses patent-pending Hysteretic Current-mode control to regulate both the input and the output currents. This enables superior input surge immunity without the necessity for complex loop compensation. Input current control enables current limiting during Startup, Input Undervoltage and Output Overload conditions. The AT9933 provides a low-frequency PWM dimming input that can accept an external control signal with a duty cycle of 0%-100% and a high dimming ratio. This AT9933-based LED driver is ideal for LED lamps. The part is rated for up to 125°C ambient temperatures. 8-lead SOIC (Top View) See Table 2-1 for pin information. VIN 1 CS1 2 GND 3 GATE 4 8 REF 7 CS2 6 VDD 5 PWMD  2016-2023 Microchip Technology Inc. and its subsidiaries DS20005597B-page 1 AT9933 Functional Block Diagram VIN CS...