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Número de pieza | AL1676 | |
Descripción | UNIVERSAL HIGH POWER FACTOR BUCK LED DRIVER | |
Fabricantes | Diodes | |
Logotipo | ||
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No Preview Available ! AL1676
UNIVERSAL HIGH POWER FACTOR BUCK LED DRIVER
Description
The AL1676 is a universal AC input (85~277 VAC), high power factor
(PF) and high efficiency Buck LED driver. The AL1676 topology
provides accurate constant current (CC) with good line and load
regulation, operating at boundary conduction mode (BCM) to ease in
EMI/EMC qualification and testing to meet the latest regulatory laws.
The AL1676 single Buck stage driver works with a single winding
inductor and High voltage MOSFET included, therefore, can use
fewer external components and create a low bill of material (BOM)
cost solution. The AL1676 has rich protection features to enhance
system safety and reliability, including under voltage lock out (UVLO),
LED open/short, over voltage, over current, over temperature
protection and thermal fold-back function which can reduce output
current when the driver’s temperature is higher than the setting value.
Pin Assignments
(Top View)
VCC 1
ROVP 2
COMP 3
GND 4
7D
6 NC
5 CS
SO-7
The AL1676 is available for SO-7 package.
Features
>90% Efficiency
Universal 85 to 277 VAC Input Range
Multiple Options for Internal MOSFET
Tight Output Current Tolerance: ±3%
Low Startup Current: 100µA
Low Operation Current: 170µA (5KHs Switching)
Single Winding Inductor
Internal Protections:
Under Voltage Lock Out (UVLO)
Leading-Edge Blanking (LEB)
Cycle-by-cycle Over Current Protection (OCP)
Output Open/Short Protection (OVP/OSP)
Thermal Fold-back 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)
Applications
Retrofit LED Lamps
LED Tube
High Voltage DC-DC LED Driver
General Purpose Constant Current Source
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.
AL1676
Document number: DS38290 Rev. 1 - 2
1 of 15
www.diodes.com
February 2016
© Diodes Incorporated
1 page AL1676
Electrical Characteristics (@TA = +25°C, unless otherwise specified.) (Cont.)
Symbol
Parameter
ROVP
VROVP
Current Sense
Reference Voltage of ROVP Pin
–
VREF
VCS_CLAMP
tON_MIN
tON_MAX
tOFF_MAX
tOFF_MIN
Error Amplifier
Internal Reference Voltage
VCS Clamp Voltage
Minimum tON
Maximum tON
Maximum tOFF
Minimum tOFF (Note 7)
–
–
–
–
–
–
Gm Gm Trans-conductance
–
ISOURCE
ISINK
Amplifier Source Current
Amplifier Sink Current
–
–
Thermal Foldback and Over Temperature Protection
TREG
–
Overheating Temperature
Regulation (Note 7)
Shutdown Temperature (Notes 7, 8)
–
–
Conditions
Min Typ Max
– 0.5 –
– 0.400 –
– 0.8 –
– 550 –
– 29 –
– 180 –
–6–
– 25 –
– 10 –
–9–
– +150 –
– +170 –
Notes:
7. These parameters, although guaranteed by design, are not 100% tested in production.
8. The device will latch off when OTP happens, recovered after power cycle and device won’t operating normally at this temperature.
Unit
V
V
V
ns
µs
µs
µs
µA/V
µA
µA
°C
°C
AL1676
Document number: DS38290 Rev. 1 - 2
5 of 15
www.diodes.com
February 2016
© Diodes Incorporated
5 Page AL1676
Functional Description and Application Information (Cont.)
The AL1676 controls the system operating at boundary conduction mode which results in its operating frequency inconstant. To set the minimum
switching frequency fMIN at the crest of the minimum AC input.
L2 ( 2VIN _ RMS VO ) VO …………… (9)
I PEAK 2VIN _ RMS fMIN
According to the Faraday’s Law of Induction, the winding number of the inductance can be calculated by:
NL2
L2 IPEAK
Ae Bm
……………
(10)
Where,
Ae is the core effective area.
Bm is the maximum magnetic flux density.
The AL1676 has designed the minimum tON time and maximum tON time, the tON_MIN is about 700ns and the tON_MAX time is about 29µs. In buck
topology there is the equation VIN_RMS-VO=L*IPEAK/tON. If the inductance is too small, it will make tON smaller than tON_MIN, the device cannot
detect the peak current of the system, resulting in incorrect output current. If the inductance is too large, make tON longer than the tON_MAX, the
system’s output current will decrease because of the limit of the tON_MAX.
The AL1676 has also the limitation of minimum tOFF time and maximum tOFF time, the tOFF_MIN time is about 6µs and tOFF_MAX time is about 180µs.
In buck topology there is the equation VO=L*IPEAK/tOFF. If the inductance is too small, make tOFF smaller than tOFF_MIN, the system will enter DCM
mode, and the output current will be incorrect. If the inductance is too large, make tOFF longer than tOFF_MAX, the system will enter CCM mode, and
the output current will also be incorrect. So a suitable value of the inductance is very important.
Consider these parameters, two examples of the typical application inductance is recommended as below:
System spec
60V/100mA (85~265VAC)
42V/150mA (85~265 VAC)
Inductance Value
2.2mH
1.1mH
System Frequency
64KHz(230 VAC)
64KHz(230 VAC)
tON_MIN
2.4µs (265 VAC)
1.6µs (265 VAC)
tOFF
12.6µs
13.5µs
Recommended Applications
The AL1676 integrates different MOSFET to adapt different wattage application. The output current is limited by the integrated MOSFET, and the
SO-7 package’s heat dissipation capability. The minimum output voltage is limited by the LEB time, and the minimum output voltage is
recommended to 20V. The recommended application is given below:
Device
AL1676-20A
AL1676-30A
AL1676-10B
AL1676-20B
AL1676-20C
AL1676-40D
Output Power Coverage
≤10W
≤13W
≤7W
≤10W
≤10W
≤18W
Maximum Output Current
≤200mA
≤300mA
≤120mA
≤200mA
≤200mA
≤350mA
Minimum Output Voltage
20V
20V
20V
20V
20V
20V
AL1676
Document number: DS38290 Rev. 1 - 2
11 of 15
www.diodes.com
February 2016
© Diodes Incorporated
11 Page |
Páginas | Total 15 Páginas | |
PDF Descargar | [ Datasheet AL1676.PDF ] |
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