AL1697
High PF, Offline Dimmable LED Driver with Internal High-Voltage MOSFET
Description
Pin Assignments
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 (Top View)
current over wide line and load regulation. The wide switching
frequency operates at boundary conduction mode (BCM) to ease
1 7
VCC D
EMI/EMC design, and testing to meet the latest regulatory standards.
RT 2
The AL1697 with built in MOSFET solution reduces the bill of material
COMP 3 6 CS
(BOM) cost by eliminating the need of auxiliary winding and an
external high voltage MOSFET. The AL1697 has extensive protection
4 5 FB
GND
features to enhance system safety and reliability. The AL1697 starts
reducing output current when the drivers temperature is higher than
the built-in thermal foldback protection trigger point.
SO-7
The AL1697 applies to a wide range of dimmers including leading
edge and trailing edge dimmer. Some can achieve deep dimming
Applications
down to 1%. The AL1697 dimming curve is compliant with the NEMA
Mains Dimmable LED Lamps
SSL6 standard.
Offline LED Power Supply Driver
The AL1697 is available in SO-7 package, which provides an extra
pin spacing between the high voltage MOSFETs drain and low
voltage pins to increase electricity isolation.
Features
Three Internal High-Voltage MOSFET Options:
R 2.8(3A /400V), 4(2A/600V) and 1.8(4A /670V)
DS(ON)
for Super-Junction
Tight Current Sense Tolerance : 3%
Low Startup Current: 130A
Low Operation Current: 170A (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
AL1697
Typical Applications Circuit
L1
R2
FR1
R3
AC
VCC D
Input 1 7
DB1
RT
R1
2
COMP CS
6
3
C2 GND
C3 C4 FB
C1
R6
4 5
C6
R5
D1
R4
R9
C5
LEDS
R7
L2
D2
+
R8
Pin Descriptions
Pin Number Pin Name Function
1 VCC Power supply voltage
2 RT Resistor set the systems maximum t
ON
3 COMP Compensation for current control
4 GND Ground
5 FB Feedback for LED open protection voltage
6 CS Current sensing
7 D Drain of the internal high voltage MOSFET
Functional Block Diagram
D
7
1
VCC
OFF
STOP
Fault V
CC VCC
Clamp
UVLO Management
Management
OTP
OVP
V V
DD REF
t Detection
ONS
2
(ZCD)
RT
Set t _max
ON
VCC
t _max
ON
Driver Supply
Clamp
S
R
Q
3 6
COMP
- Sample and Hold
CS
-
Gm
+
t _max
ON
+ VREF
ST OP
OCP
+
-
1V
V
REF_OVP
4
OVP
5
GND OVP
FB
2 of 13
AL1697 July 2016
Diodes Incorporated
www.diodes.com
Document number: DS38223 Rev. 4 - 2
U1 AL1697