IW3637-01A

iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces 1 Description The iW3637 is a high-performance AC/DC power controller optimized for non-isolated buck or isolated flyback converter applications to step-down a high-voltage DC input to drive LEDs in SSL lighting applications. A converter designed with the iW3637 can work with a DC input voltage from a front-end, off-line boost converter to minimize low frequency output ripple current, and virtually eliminate all flicker in the system. It uses Dialog’s PrimAccurate™ advanced sensing technology to achieve excellent output current regulation without the need for direct voltage or current feedback components. It also eliminates the need for external loop compensation while maintaining stability across all operating conditions. The iW3637 offers a 1% to 100% dimming range and provides a dedicated PWM dimming input pin that supports a wide variety of dimming application interfaces such as wireless modules, MCUs or 0-10V interfaces. In addition, the iW3637 accepts a secondary PWM input to allow maximum output current configuration. Dialog’s innovative proprietary technology maximizes the iW3637 performance in an SOIC-8 package. It provides maximum design flexibility by providing two multi-function pins to configure IC functions such as the dimming curve and minimum dimming level. Additionally, the iW3637 features a soft-off function before entering into light-off mode, where the device remains alive with minimal standby power consumption. 2 Features ●● Supports buck and flyback topologies with input from front-end off-line boost converter or rectified AC input ●● Enhanced MOSFET driver supports output power up to 150W in an SOIC-8 package ●● Wide VCC operating range from 7.5V to 30V ●● Fast dimming transient response ●● Built-in over-temperature protection with temperaturecurrent derating ●● PrimAccurateTM sensing achieves tight output current ●● External NTC-based over-temperature protection regulation (±3%) (iW3637-02 only) ●● Independent maximum load current setting interface ●● Configurable dimming curve: linear or logarithm ●● Low standby power ●● Built-in soft-start ●● Wide dimming range 1% - 100% ●● Active start-up scheme enables fast start-up ●● Configurable minimum dimming setting: dim-to-off, ●● Fault protection: output open, output over-voltage, 1%, 5% or 10% output short and input voltage under-voltage protections ●● Configurable 72kHz or 90kHz PWM switching frequency with quasi-resonant operation ●● Light-off mode with soft-off feature 3 Applications ●● 0-10V dimmable LED drivers ●● Dimmable commercial T8 ●● External and fixture driver lighting applications ●● Wireless and intelligent LED lighting Product Summary www.dialog-semiconductor.com Rev. 1.0 1 of 8 23-Feb-2019 © 2019 Dialog Semiconductor iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces VOUT AC Boost Converter + _ RTN U1 iW3637 VCC OUTPUT PWM ISENSE VIN NTC/DIM2 VSENSE GND DIM1 PWM MCU or Wireless Module Figure 3.1 : iW3637 Typical Application Circuit with Input Connected from Boost Converter (Using Enhancement-mode FET as Active Start-up Device). VOUT AC + _ RTN U1 iW3637 OUTPUT VCC ISENSE VIN NTC/DIM2 VSENSE GND DIM1 PWM MCU or Wireless Module Figure 3.2 : iW3637 Typical Application Circuit with Input Connected to Rectified AC (Using Depletion-mode FET as Active Start-up Device) Product Summary www.dialog-semiconductor.com Rev. 1.0 2 of 8 23-Feb-2019 © 2019 Dialog Semiconductor iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces VOUT Boost Converter AC RTN U1 iW3637 OUTPUT VCC ISENSE VIN NTC/DIM2 VSENSE GND DIM1 PWM MCU or Wireless Module Figure 3.3 : iW3637 Typical Application Circuit with Input Connected from Boost Converter (Configured in the Flyback Topology and Using Depletion-mode FET as Active Start-up Device). Product Summary www.dialog-semiconductor.com Rev. 1.0 3 of 8 23-Feb-2019 © 2019 Dialog Semiconductor iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces 4 Pinout Description iW3637 DIM1 8 1 NTC/DIM2 2 ISENSE VIN 7 VSENSE 6 3 GND VCC 5 4 OUTPUT Figure 4.1 : 8-Lead SOIC-8 Package Pin Number Pin Name Type Pin Description 1 NTC/DIM2 Digital Input By product option (refer to section 11): PWM: provides maximum load current setting via PWM signal. Set this pin voltage above 1V (typical) DC voltage to bypass the function. Analog: provides a 2nd dimming interface via an analog signal (0-1.8V). NTC: used for external temperature sensing via an NTC resistor. 2 ISENSE Analog Input Provides current sense for cycle-by-cycle peak current control and limit during normal operation, and serves as a configuration pin during startup. 3 GND Ground Ground. 4 OUTPUT Output Gate drive for external MOSFET switch. 5 VCC Power IC power supply. 6 VSENSE Analog Input Provides output voltage sense during normal operation, and serves as a configuration pin during startup. 7 VIN Analog Input Control active start-up devices and sense input bus voltage. 8 DIM1 Digital Input PWM dimming input detection. Product Summary www.dialog-semiconductor.com Rev. 1.0 4 of 8 23-Feb-2019 © 2019 Dialog Semiconductor iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces 5 Absolute Maximum Ratings Absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. Parameter Symbol Value Units DC supply voltage range (pin 5, ICC = 20mA max) VCC -0.3 to 31 V Continuous DC supply current at VCC pin ICC 20 mA VIN (pin 7) -0.3 to 31 V OUTPUT (pin 4) -0.3 to 31 V VSENSE input (pin 6, IVSENSE ≤ 10mA) -0.3 to 7 V ISENSE input (pin 2) -0.3 to 7 V DIM2 (pin 1) -0.3 to 7 V DIM1 (pin 8) -0.3 to 7 V Maximum junction temperature TJMAX 150 °C Operating junction temperature TJOPT -40 to 150 °C Storage temperature TSTG -65 to 150 °C θJA 170 °C/W ±2,000 V ±100 mA Thermal resistance junction-to-ambient ESD rating per JEDEC JS-001-2017 Latch-up test per JESD78E Product Summary www.dialog-semiconductor.com Rev. 1.0 5 of 8 23-Feb-2019 © 2019 Dialog Semiconductor iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces 6 Physical Dimensions Product Summary www.dialog-semiconductor.com Rev. 1.0 6 of 8 23-Feb-2019 © 2019 Dialog Semiconductor iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces 7 Ordering Information Options Part no. Internal OTP Package Description content Light-off Delay Time Independent PWM Output Current Control Enabled 100ms SOIC-8 Tape & Reel1 Buck Topology Independent PWM Output Current Control Enabled No Delay SOIC-8 Tape & Reel1 iW3637-02 Buck Topology NTC Enabled 100ms SOIC-8 Tape & Reel1 iW3637-03 Buck Topology Analog 0-1.8V Enabled 100ms SOIC-8 Tape & Reel1 iW3637-05 Flyback Topology Independent PWM Output Current Control Enabled 100ms SOIC-8 Tape & Reel1 iW3637-31 Buck Topology Analog 0-1.8V Disabled 100ms SOIC-8 Tape & Reel1 Topology DIM2 iW3637-01 Buck Topology iW3637-01A Note 1: Tape and reel packing quantity is 2,500/reel. Minimum packing quantity is 2,500. Product Summary www.dialog-semiconductor.com Rev. 1.0 7 of 8 23-Feb-2019 © 2019 Dialog Semiconductor iW3637 Off-line LED Driver Controller Supports Wide Range of PWM Dimming Interfaces Disclaimer Information in this document is believed to be accurate and reliable. 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