Document
AL1697
HIGH PF, OFFLINE DIMMABLE LED DRIVER WITH INTERNAL HIGH-VOLTAGE MOSFET
Description
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.
Pin Assignments
(Top View)
VCC 1 RT 2
COMP 3 GND 4
SO-7
7D
6 CS 5 FB
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 SSL6 standard.
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.
Applications
Mains Dimmable LED Lamps Offline LED Power Supply Driver
Features
Three Internal High-Voltage MOSFET Options: RDSON) 2.8Ω(3A /400V), 4Ω(2A/600V) and 1.8Ω(4A /670V) 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 Internal Protections
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) SO-7 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
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"
and Lead-free. 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.
AL1697
Document number: DS38223 Rev. 6 - 2
1 of 13 www.diodes.com
October 2017
© Diodes Incorporated
AL1697
Typical Applications Circuit
L1
AC Input
FR1 DB1
R1
C1 C2 C3
R2 R3
VCC 1
RT 2
COMP 3
C4
R6
GND
C6 4
R4
D2
U1 AL1697
7D
6 CS 5 FB
R5
D1
R9
L2 R7 R8
C5 +
LEDS
Pin Descriptions
Pin Number 1 2 3 4 5 6 7
Pin Name VCC RT COMP GND FB CS D
Function Power Supply Voltage Resistor Set the System’S Maximum tON Compensation for Current Control Ground Feedback for LED Open Protection Voltage Current Sensing Drain of the Internal High Voltage MOSFET
Functional Block Diagram
VCC 1
STOP
Fault Management
OTP OVP
OFF UVLO
2 RT Set tON_max
tON_max
COMP 3
S R
Q
tON_max STOP
+
4 GND
VCC VCC Management Clamp
VDD
VREF
tONS Detection (ZCD)
VCC
Driver Supply Clamp
-
Gm
+ VREF
Sample and Hold
OCP
+ -
1V
VREF_OVP
OVP
OVP
D 7
6 CS
5 FB
AL1697
Document number: DS38223 Rev. 6 - 2
2 of 13 www.diodes.com
October 2017
© Diodes Incorporated
AL1697
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4)
Notes:
Symbol VCC
VD
IDS
VCS VRT VFB TJ TSTG TLEAD PD JA JC
–
Power Supply Voltage
Parameter
Voltage on Drain Pin (AL1697-30BAS7-13)
Voltage on Drain Pin (AL1697-20CS7-13)
Voltage on Drain Pin (AL1697-40DS7-13) Continuous Drain Current TC = +25°C (AL1697-30BAS7-13) Continuous Drain Current TC = +25°C (AL1697-20CS7-13) Continuous Drain Current TC = +25°C, (AL1697-40DS7-13) Voltage on CS Pin
Voltage on RT Pin
Voltage on FB Pin
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 seconds)
Power Dissipation (TA = +50°C) (Note 5)
Thermal Resistance (Junction to Ambient) (Note 5)
Thermal Resistance (Junction to Case) (Note 5)
ESD (Human Body Model)
Rating 18 400 600 670 3 2 4
-0.3 to 7 -0.3 to 7 -0.3 to 7 -40 to +150 -65 to +150
+260 0.8 123 19 2,000
Unit V V V V A A A V V V °C °C °C W
°C/W °C/W
V
4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. All voltages unless ot.