NOT RECOMMENDED FOR NEW DESIGNS RECOMMENDED REPLACEMENT PARTS ISL97671A or ISL97672B DATASHEET ISL97673 FN7633 Rev.3.00 6-Channel SMBus or PWM Dimming LED Driver with Phase Shift Control Sep 19, 2017 The ISL97673 is a 6-Channel 45V dual dimming Features capable LED driver that can be used with either 2 6 channels SMBus/I C or PWM signal for dimming control. The ISL97673 drives 6 channels of LED to support 78 LEDs 4.5V to 26.5V input from 4.5V to 26V or 48 LEDs from a boost supply of 45V output max 2.7V to 26V and a separate 5V bias on the ISL97673 Up to 40mA LED current per channel VIN pin. Extensive dimming control The ISL97673 compensates for non-uniformity of the 2 - PWM/DPST dimming, I C 8-bit with equal phase forward voltage drops in the LED strings with its six shift, and 0.007% direct PWM dimming at 200Hz voltage controlled-current source channels. Its Optional master fault protection headroom control monitors the highest LED forward voltage string for output regulation, to minimize the PWM dimming linearity 0.4%~100% <30kHz voltage headroom and power loss in a typical 600kHz/1.2MHz selectable switching frequency multi-string operation. Dynamic headroom control The ISL97673 features optional channel phase shift Protections with flag indication control to minimize the input, output ripple - String open/short circuit, V short circuit, OUT characteristics, and load transients, as well as overvoltage, and over-temperature protections spreading the light output to help reduce video and - Optional master fault protection audio interference from the backlight driver operation. The phase shift can be programmed with equal phase Current matching 0.7% angle or adjustable in 7-bit resolution. 20 Ld 4mmx3mm QFN package The ISL97673 has a full range of dimming capabilities 2 Applications that include SMBus/I C controlled PWM dimming or DC dimming. Another key feature of the ISL97673 is that Notebook displays WLED or RGB LED backlighting it allows very linear PWM dimming from 0.4% to 100% LCD monitor LED backlighting of up to 30kHz. Current matching of 0.4% to 100% Automotive displays LED backlighting dimming achieves 1% tolerance from 100Hz to 5kHz dimming and 3% tolerance from 5kHz to 30kHz dimming. Typical Application Circuit V = 45V*, 40mA PER CHANNEL OUT V = 4.5~26.5V IN ISL97673 1 FAULT LX 20 2 VIN OVP 16 4 VDC 18 COMP PGND 19 7 SMBCLK(SCL)/SEL2 CH0 10 6 SMBDAT(SDA)/ FLAG CH1 11 3 EN/PWM CH2 12 17 RSET CH3 13 8 CH4 14 FPWM CH5 15 5 SEL1 *V > 12V 9 AGND IN FIGURE 1. ISL97673 TYPICAL APPLICATION DIAGRAM FN7633 Rev.3.00 Page 1 of 28 Sep 19, 2017ISL97673 Table of Contents Block Diagram ................................................ 3 Components Selections ...................................25 Input Capacitor ............................................. 25 Ordering Information..........................................4 Inductor....................................................... 26 Pin Configuration............................................ 4 Output Capacitors.......................................... 26 Pin Descriptions ............................................. 4 Output Ripple................................................ 26 Schottky Diode.............................................. 26 Absolute Maximum Ratings ............................ 5 Applications ....................................................26 Thermal Information ...................................... 5 High Current Applications ............................... 26 Operating Conditions...................................... 5 Multiple Drivers Operation .............................. 27 Electrical Specifications ......................................6 Revision History ..............................................28 Typical Performance Curves ........................... 9 About Intersil..................................................28 Theory of Operation........................................ 12 Package Outline Drawing ................................ 29 PWM Boost Converter .....................................12 Enable and PWM ............................................12 OVP and V Requirement .............................12 OUT Current Matching and Current Accuracy ............12 Dynamic Headroom Control .............................12 Operating Modes............................................12 Dimming Controls ..........................................13 PWM Dimming Frequency Adjustment...............14 Switching Frequency.......................................15 5V Low Dropout Regulator...............................15 In-rush Control and Soft-start..........................15 Fault Protection and Monitoring........................15 Short Circuit Protection (SCP) ..........................15 Open Circuit Protection (OCP) ..........................16 Overvoltage Protection (OVP) ..........................16 Undervoltage Lockout .....................................16 Input Overcurrent Protection ...........................16 Over-Temperature Protection (OTP)..................16 Write Byte ........................................................19 Read Byte.........................................................19 Slave Device Address.........................................19 SMBus/I2C Register Definitions........................19 PWM Brightness Control Register (0x00) ...........21 Device Control Register (0x01) ........................21 Fault/Status Register (0x02)............................22 Si Revision Register (0x03) .............................22 DC Brightness Control Register (0x07) ..............23 Configuration Register (0x08)..........................23 Output Channel Select and Fault Readout Register (0x09) .............................................................24 Phase Shift Control Register (0x0A)..................25 FN7633 Rev.3.00 Page 2 of 28 Sep 19, 2017