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PDF ( 数据手册 , 数据表 ) AL1696

零件编号 AL1696
描述 HIGHLY INTEGRATION OFFLINE DIMMABLE LED DRIVER
制造商 Diodes
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AL1696 数据手册, 描述, 功能
AL1696
HIGHLY INTEGRATION OFFLINE DIMMABLE LED DRIVER
Description
The AL1696 is a highly integrated high power factor constant current
converter for mains dimmable LED driver applications. The AL1696
controls the system operating in boundary conduction mode (BCM) to
ease in EMI/EMC qualification and testing to meet the latest
regulatory standards.
The AL1696 with build-in MOSFET solution reduces the bill of
material (BOM) cost by eliminating the need of auxiliary winding and
external high voltage MOSFET.
Pin Assignments
(Top View)
NC 1
NC 2
CS 3
GND 4
7D
6 VCC
5 RT
The AL1696 can be compatible with a wide range of dimmers
including leading edge and trailing edge dimmers. Some dimmers can
achieve deep dimming down to 1%. The AL1696 dimming curve is
compliant with the standard of NEMA SSL6.
The AL1696 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.
SO-7
Applications
Mains Dimmable LED Lamps
Offline LED Power Supply Driver
Features
Internal MOSFET up to 300V/3A, 500V/2A, 600V/2A
Tight Current Sense Tolerance: ±3%
Low Startup Current: 150µA
Low Operation Current: 120µA (Switching Frequency at 5kHz)
Single Winding Inductor
Wide Range of Dimmer Compatibility
Dimming Curve Compliant with NEMA SSL6
Internal Protections
Under Voltage Lockout (UVLO)
Leading-Edge Blanking (LEB)
Cycle-by-cycle Over Current Protection (OCP)
Output Short Protection (OSP)
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.
AL1696
Document number: DS38304 Rev. 1 - 2
1 of 14
www.diodes.com
October 2015
© Diodes Incorporated







AL1696 pdf, 数据表
AL1696
Functional Description and Application Information
Convertor Operation
The AL1696 is a single stage, single winding inductor, high efficiency, and high power factor LED driver solution for mains input phase-cutting
dimmable application. It is available for three internal MOSFET options (300V/3A, 500V/2A and 600V/2A) which helps to reduce the overall LED
driver solutions size and optimize bom cost. The three different MOSFET options can cover most of 3~12W dimmable applications.
The AL1696 internal MOSFETs on time is limited by tON_MAX which is set through RT pin and internal 0.4V reference. The MOSFET will be turned
off either its on time triggers tON_MAX or input voltage on CS pin triggers internal 0.4V reference voltage. So if the tON_MAX is set to a very small
value, the system will operate in constant on-time (tON_MAX) mode during the whole rectified mains cycle. It will result in a good power factor, but
the line regulation will be worse. Normally, a recommended tON_MAX should make the system operate in constant on-time (tON_MAX) mode at valley
of input voltage and peak current mode at the crest. A trade off between PF and line regulation need to be done when setting tON_MAX.
The AL1696 adopts source-driver technology to decrease the system operating current. Besides, it uses a novel tOFF time detection method
without auxiliary winding. The AL1696 operates in boundary conduction mode (BCM) which can ease EMI design. All of them help AL1696 to have
an extremely low bill of material (BOM).
L1
AC
Input
FR1
DB1
C1
R1
C2
NC 1
C3
R5
NC 2
CS 3
GND 4
7D
R2
R3
6 VCC
5 RT
C4
R6
R4
D2
D1
L2 R7
C5 LEDS
Figure 1. Typical Buck-Boost Application Circuit
Start-up and Supply Voltage
During start-up, the VCC capacitor C4 is charged through startup resistors (R2, R3) from the rectified mains input until the start-up voltage is
reached, the AL1696 starts switching. In normal operation, the VCC supply is provided from two paths: one is from start-up resisters (R2, R3) and
the other is from output voltage (VOUT) through one diode (D2). In this way the system can provide sufficient VCC supply at low dimming angle.
The AL1696 has internal VCC clamp, the typical voltage is 16V. VCC voltage needs to be between VOPR(min) and VCC_CLAMP during normal
operation.
When VCC voltage drops below the under voltage lockout (UVLO), IC will stop switching. The IC will restart once the voltage on VCC pin exceeds
the startup voltage (VTH(ST)) again.
Protections
Under Voltage Lockout (UVLO)
When the voltage on the VCC pin drops below VOPR(Min), the IC will stop switching. The IC will restart until the VCC voltage exceeds the startup
voltage (VTH (ST)) again.
Leading-Edge Blanking (LEB)
To prevent false detection of the peak current through MOSFET, a blanking time following switch-on is designed. When the internal switch turns
on, a short current spike may appear because of the discharge of the parasitic capacitor over MOSFETs drain and source. It will be ignored
during the LEB time (tON_MIN).
Cycle-by-cycle Over Current Protection (OCP)
The AL1696 has a built-in peak current detector. The R5 connected to the CS pin is used to sense the current through MOSFET and will be one of
the inputs. The detection circuit is activated after the LEB time. When the voltage on CS pin reaches VREF, the IC will turn off the switch to limit the
output current.
AL1696
Document number: DS38304 Rev. 1 - 2
8 of 14
www.diodes.com
October 2015
© Diodes Incorporated














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