High PF, Offline Dimmable LED Driver with Internal High-Voltage MOSFET
The AL1697 is a high performance, high power factor, high efficiency
and high precision buck-boost LED driver for mains dimmable LED
lamp applications. The AL1697 topology provides an accurate output
current over wide line and load regulation. The wide switching
frequency operates at boundary conduction mode (BCM) to ease
EMI/EMC design, and testing to meet the latest regulatory standards.
The AL1697 with built in MOSFET solution reduces the bill of material
(BOM) cost by eliminating the need of auxiliary winding and an
external high voltage MOSFET. The AL1697 has extensive protection
features to enhance system safety and reliability. The AL1697 starts
reducing output current when the driver’s temperature is higher than
the built-in thermal foldback protection trigger point.
The AL1697 applies to a wide range of dimmers including leading
edge and trailing edge dimmer. Some can achieve deep dimming
down to 1%. The AL1697 dimming curve is compliant with the NEMA
The AL1697 is available in SO-7 package, which provides an extra
pin spacing between the high voltage MOSFET’s drain and low
voltage pins to increase electricity isolation.
Mains Dimmable LED Lamps
Offline LED Power Supply Driver
Two Internal High-Voltage MOSFET Options:
RDSON 4Ω and 1.8Ω for Super-Junction
Tight Current Sense Tolerance : ±3%
Low Startup Current: 130µA
Low Operation Current: 170µA (Switching Frequency at 4kHz)
Single Winding Inductor
Wide Range of Dimmer Compatibility
NEMA SSL6 Dimming Curve Compliant
Under Voltage Lockout (UVLO)
Leading-Edge Blanking (LEB)
Cycle-by-cycle Over Current Protection (OCP)
Output Open/Short Protection (OVP/OSP)
Thermal Foldback Protection (TFP)
Over-Temperature Protection (OTP)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Document number: DS38223 Rev. 3 - 2
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