IW3638-31

iW3638 High-Power Step-Down LED Driver Supports Wide Range of PWM Dimming Interfaces 1 Description The iW3638 is a high-performance second-stage buck LED driver optimized to supply constant-current to LEDs directly from DC power supplies typically below 100V. The controller supports a non-isolated buck-converter topology to postregulate from an off-line AC/DC converter, minimizing low frequency output ripple current and eliminating virtually 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 and current feedback components. It also eliminates the need for external loop compensation while maintaining stability across all operating conditions. The iW3638 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 iW3638 accepts a secondary dimming input pin to allow maximum output current configuration. Dialog’s innovative proprietary technology maximizes the iW3638 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 iW3638 features a soft-off function before entering into light-off mode, where the device remains alive with minimal standby power consumption. 2 Features ●● Wide VCC operating range from 7.5V to 30V ●● Supports wide DC input voltage with tight output current regulation (±3%) ●● Enhanced MOSFET driver supports output power up to 90W or above in an SOIC-8 package ●● Dual dimming interfaces ●● Low standby power ●● Supports 0-10V dimming with the iW339 series interface controllers ●● Wide dimming range 1% - 100% ●● Configurable minimum dimming setting: dim-to-off, 1%, 5% or 10% ●● Fast dimming transient response ●● Built-in over-temperature protection or by external NTC ●● Configurable dimming curve: linear or logarithmic ●● Built-in soft-start achieves fast and smooth start-up for all different operating conditions ●● Built-in single-point fault protection features: output open, output over-voltage, output short and input voltage under-voltage protections ●● 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 6 23-Feb-2019 © 2019 Dialog Semiconductor iW3638 High-Power Step-Down LED Driver Supports Wide Range of PWM Dimming Interfaces L VOUT Flyback Converter + _ N RTN U1 iW3638 OUTPUT ISENSE NTC/DIM2 GND NTC VCC VIN VSENSE DIM1 PWM MCU or Wireless Module Figure 3.1 : iW3638 Typical Application Circuit (Wireless Dimming with NTC Derating Using Depletion-mode FET as Active Start-up Device) L VOUT Flyback Converter + _ N RTN iW339 U1 iW3638 ISENSE NTC/DIM2 GND VCC VIN 3.3V LDO OUTPUT 3-in-1 Dimming Control 0-10V PWM VCC VIN DRV DIM or 10V 0-10V Analog 0V or VSENSE FLT SD GND CF Resistive DIM1 PWM Figure 3.2 : iW3638 Typical Application Circuit (3-in-1 Dimming with Maximum Current Modulated by the Voltage at NTC/ DIM2 Pin and Using Enhancement-mode FET as Active Start-up Device) Product Summary www.dialog-semiconductor.com Rev. 1.0 2 of 6 23-Feb-2019 © 2019 Dialog Semiconductor iW3638 High-Power Step-Down LED Driver Supports Wide Range of PWM Dimming Interfaces 4 Pinout Description iW3638 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 / Analog In/Out 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 switch 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 3 of 6 23-Feb-2019 © 2019 Dialog Semiconductor iW3638 High-Power Step-Down LED Driver 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 = 10mA 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 NTC/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 Thermal resistance junction-to-ambient θJA 170 °C/W ±2,000 V ±100 mA ESD rating per JEDEC JS-001-2017 Latch-up test per JESD78E Product Summary www.dialog-semiconductor.com Rev. 1.0 4 of 6 23-Feb-2019 © 2019 Dialog Semiconductor iW3638 High-Power Step-Down LED Driver Supports Wide Range of PWM Dimming Interfaces 6 Physical Dimensions 7 Ordering Information Part no. Options Package Description iW3638-01 PWM DIM2 interface SOIC-8 Tape & Reel1 iW3638-02 NTC DIM2 interface SOIC-8 Tape & Reel1 iW3638-03 Analog DIM2 interface SOIC-8 Tape & Reel1 iW3638-31 Analog DIM2 interface (Internal OTP Disabled) SOIC-8 Tape & Reel1 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 5 of 6 23-Feb-2019 © 2019 Dialog Semiconductor iW3638 High-Power Step-Down LED Driver Supports Wide Range of PWM Dimming Interfaces Disclaimer Information in this document is believed to be accurate and reliable. However, Dialog Semiconductor does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information. Dialog Semiconductor furthermore takes no responsibility whatsoever for the content in this document if provided by any information source outside of Dialog Semiconductor. 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Phone: +1 408 845 8500 Hong Kong Dialog Semiconductor Hong Kong Phone: +852 2607 4271 China (Shenzhen) Dialog Semiconductor China Phone: +86 755 2981 3669 Germany Dialog Semiconductor GmbH Phone: +49 7021 805-0 Japan Dialog Semiconductor K. K. Phone: +81 3 5769 5100 Korea Dialog Semiconductor Korea Phone: +82 2 3469 8200 China (Shanghai) Dialog Semiconductor China Phone: +86 21 5424 9058 The Netherlands Dialog Semiconductor B.V. Phone: +31 73 640 8822 Taiwan Dialog Semiconductor Taiwan Phone: +886 281 786 222 Email info_pcbg@diasemi.com Web site: www.dialog-semiconductor.com Product Summary www.dialog-semiconductor.com Rev. 1.0 6 of 6 23-Feb-2019 © 2019 Dialog Semiconductor