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AL1672 Datasheet

SINGLE STAGE DIMMABLE BUCK CONVERTER

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AL1672
SINGLE STAGE DIMMABLE BUCK CONVERTER
WITH 600V/4A MOSFET
Description
The AL1672 is a high performance single stage Buck convertor,
targeting dimmable LED lighting application. It is operating at BCM
mode which results in good EMI and efficiency.
The AL1672 can support multiple dimming modes. When a 0.3~2.4V
DC signal is applied on APWM pin, the device will operate in analog
dimming mode. When a digital signal is applied on APWM pin, the
device works at PWM dimming mode.
The AL1672 features low start-up current and low operation current. It
integrates multiple protections including over voltage, short circuit,
over current and over temperature protection. It also integrates
600V/4A high voltage MOSFET.
The AL1672 is available in SO-8EP package.
Pin Assignments
(Top View)
CS 1
GND 2
DRAIN 3
DRAIN 4
EP
SO-8EP
8 COMP
7 APWM
6 FB
5 VCC
Features
Applications
Valley Switching for Low Switching Loss
Low Start-Up Current
High PF and Low THD
High Efficiency
Tight LED Current Variation Range
Tight Output Open Voltage Variation Range
Integrates 600V/4A MOSFET
Support Both PWM Dimming and Analog Dimming
PWM Dimming Range:3% to 100% at 1kHz PWM
Frequency
Analog Dimming and PWM-to-DC Dimming Range:18%
to 100%
Internal Protections
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Output Short Protection (OSP)
Over Current Protection (OCP)
Thermal Fold-Back Protection (TFP)
Over Temperature Protection (OTP)
Low System Cost
Package: SO-8EP
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
General LED Lighting Driver with Dimming Function
General Purpose Constant Current Source
Smart LED Lighting
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.
AL1672
Document number: DS39344 Rev. 1 - 2
1 of 14
www.diodes.com
July 2017
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AL1672 Datasheet

SINGLE STAGE DIMMABLE BUCK CONVERTER

No Preview Available !

Typical Applications Circuit
AL1672
AC
Input
F1
VR1
L1
C1
DB1
RTH D1
C2
CVCC
PWM/DC
Signal
RCOMP
CCOMP
5
7
VCC
APWM
FB
8 DRAIN
COMP DRAIN
6
3
4
GND CS
21
RCS
R4
R5
R6
Pin Descriptions
AL1672 BUCK Application Circuit
R3 + C OUT
4
D2
L2
Pin Number
1
2
3,4
5
6
7
8
9
Pin Name
CS
GND
DRAIN
VCC
FB
APWM
COMP
Exposed Pad
Function
Current sense pin, connect this pin to the source of the primary
switch
Ground
Drain of internal MOS
Supply voltage of gate driver and control circuits of the IC
The feedback voltage sensing from the auxiliary winding
Analog dimming input pin or PWM signal input pin in PWM dimming
mode
Loop compensation pin
Drain of internal MOS
AL1672
Document number: DS39344 Rev. 1 - 2
2 of 14
www.diodes.com
July 2017
© Diodes Incorporated


Part Number AL1672
Description SINGLE STAGE DIMMABLE BUCK CONVERTER
Maker Diodes
Total Page 14 Pages
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