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ISL97672AIRZ-EVALZ Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL97672AIRZ-EVALZ Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 16 page 1 6-Channel LED Driver with Ultra Low Dimming Capability ISL97672A The ISL97672A is an integrated 6-channel power LED driver for LCD backlight applications. The ISL97672A is capable of driving LEDs with input from 4.5V to 26.5V and maximum output up to 45V. The ISL97672A employs an adaptive boost switching architecture that allows Direct PWM dimming with dimming duty cycle as low as 0.007% at 200Hz or 0.8% at 20kHz. PWM Dimming frequency can be as high as 30kHz. The ISL97672A employs the dynamic headroom control that monitors the highest LED forward voltage string for output regulation to minimize headroom voltage and power loss in a typical multi-string operation. Typical current matching between channels is ±0.7%. The ISL97672A incorporates extensive protection functions that flag whenever a fault occurs. The protections include string-open and short-circuit detections, OVP, OTP, and an optional output short-circuit protection with external fault disconnect switch. The ISL97672A is offered in a compact 20 Ld QFN 3x4 package and can operate in ambient temperatures of -40°C to +85°C. Features •6 x 50mA Channels • 4.5V to 26.5V Input • 45V Output Max • Adaptive Boost Switching Architecture • Direct PWM Dimming with Dimming Linearity of 0.007%~100% at 200Hz or 0.8%~100% <20kHz • Adjustable 200kHz to 1.4MHz Switching Frequency • Dynamic Headroom Control • Fault Protections with Latched Flag Indication -String Open/Short Circuit -OVP -OTP - Optional Output Short-Circuit Fault Protection Switch • Current Matching ±0.7% • 20 Ld 3x4 QFN Package Applications • Notebook Displays LED Backlighting • LCD Monitor LED Backlighting • Multi-Function Printer Scanning Light Source Typical Application Circuit FIGURE 1. ISL97672A TYPICAL APPLICATION DIAGRAM FLAG VIN = 4.5~26.5V COMP VIN OVP PWM VOUT = 45V*, 6 x 50mA VDC CH0 CH3 CH2 CH4 CH5 RSET 2 4 6 18 5 17 15 14 13 12 11 10 16 LX 20 PGND 19 AGND 9 ISL97672A CH1 EN 3 *VIN > 12V FAULT 1 Q1(OPTIONAL) FSW 8 November 22, 2013 FN7710.3 NOT RECOM MENDED FO R NEW DESIG NS RECOMMEN DED REPLA CEMENT PA RT ISL97672B CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2011, 2013. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. |
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