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PDF AL6562 Data sheet ( Hoja de datos )
| Número de pieza | AL6562 | |
| Descripción | Transition Mode PFC LED Controller | |
| Fabricantes | Diodes | |
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AL6562
Description
Features
Transition Mode PFC LED Controller
The AL6562 is a current mode Power Factor Correction Controller and
is designed for operating in Transition Mode. With a superior linear
performance multiplier, it ensures the device operates over a wide
input voltage range with superior THD (Total Harmonics Distortion).
The output voltage is controlled by means of an error amplifier and a
precise (1% @ TJ = +25°C) internal voltage reference.
The AL6562 is designed to meet stringent energy-saving standards
with low start-up current, and can operate with low current
consumption when entering stand-by mode.
OVP circuitry increases system robustness, allowing the device to
withstand transient caused at start-up and during load-disconnects.
Single Stage Fly-Back PFC Controller
Transition Mode Operation
Low Start-Up, Operating and Quiescent Currents
Internal Start-Up Timer
Enable/Disable Function on INV Input
Totem Pole, Push-Pull Output Drive
Adjustable Output Overvoltage Protection
SO-8 : Available in “Green” Molding Compound (No Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
INV
COMP
MULT
CS
1
2
3
4
AL656 2
8 Vcc
7 GD
6 GND
5 ZCD
SO-8
(SO-8/ M Package)
Applications
Electronic Single-Stage LED Driver
PFC Pre-Regulators to meet IEC61000-3-2
High-End AC-DC Adaptor / Charger
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.
Typical Applications Circuit
Figure 1 High Power Factor Non-Isolated Constant-Current LED Driver
AL6562
Document Number: DS37542 Rev. 2 - 2
1 of 16
www.diodes.com
February 2015
© Diodes Incorporated
1 page  
Electrical Characteristics
Symbol
Parameter
OUTPUT OVER-VOLTAGE
IOVP
VOVP_TH
Dynamic OVP Triggering Current
Static OVP Threshold
CURRENT SENSE COMPARATOR
ICS
td(H-L)
VCS-clamp
Input Bias Current
Delay to Output
Current Sense Clamp
VCS-offset
Current Sense Offset
GATE DRIVER
VOL Output Low Dropout Voltage
VOH Output High Dropout Voltage
tf
tr
VOclamp
Vos
Voltage Fall Time
Voltage Rise Time
Output Clamp Voltage
UVLO Saturation
AL6562
Conditions
VCS = 0
VCOMP = upper clamp
VMULT = 0
VMULT = 2.5V
IGDsink = 200 mA
IGDsource = 200 mA
IGDsource = 20 mA
ISOURCE = 5 mA, VCC =20 V
VCC =0 V to VCCon,
ISINK = 10 mA
Min Typ Max Units
35 40 45 µA
2.1 2.25 2.4
V
-1 µA
200 350
ns
1.6 1.7 1.8
V
30 mV
5
0.9 1.9 V
2.5 3.0
V
2.0 2.8 V
30 70 ns
60 110
ns
9
11 13
V
1.1
V
.
AL6562
Document Number: DS37542 Rev. 2 - 2
5 of 16
www.diodes.com
February 2015
© Diodes Incorporated
5 Page 
AL6562
Application Information (cont.)
On the other hand, when the loading of PFC pre-regulator becomes low, the output voltage tends to stay steadily above the nominal value,
which is not the case when OVP is triggered by abrupt voltage increase. If this occurs, the E/A will saturate low, the external power transistor
is switched OFF, and the IC is put in idle state (static OVP). Normal operation is resumed as the error amplifier goes back into its linear region.
As a result, the device will work in burst-mode, with a repetition rate that can be very low. When either OVP is activated, the quiescent
consumption of the IC is reduced to minimum by the discharge of the capacitor and increases the hold-up capability of the IC supply.
THD (Total Harmonics Distortion)
The AL6562 reduces the THD by reducing conduction dead-angle occurring to the AC input current near the zero-crossings of the line voltage.
The important reason for this distortion to take place is the inability of the system to transfer energy effectively when the instantaneous line
voltage is very low, which is the case near line-voltage zero-crossing. This effect is magnified by the high-frequency filter capacitor placed after
the bridge rectifier, which retains some residual voltage that causes the diodes of the bridge rectifier to be reverse-biased and the input current
flow to temporarily stop.
To overcome this issue, the circuit section designed in the AL6562 forces the PFC regulator to process more energy near the line voltage
zero-crossings, as compared to that commanded by the control loop. This results in both minimizing the time interval when energy transfer is
lacking, and fully discharging the high-frequency filter capacitor after the bridge.
In essence, the circuit artificially increases the ON-Time of the Power Switch with a positive offset added to the output of the multiplier in the
proximity of the line voltage zero-crossings. This offset is reduced as the instantaneous line voltage increases, so that it becomes negligible as
the line voltage moves towards the peak of the sinusoidal waveform.
Therefore, to maximize the benefit from the THD improvement circuit, the high-frequency filter capacitor after the bridge rectifier should be
minimized and kept to satisfy the EMI filtering requirements.
Non-Latched IC Disable (Enable)
Pin 1, INV, inverting input to the error amplifier, can be adapted to disable the system when the voltage on this pin is below 0.2V. In order to
restart the system, a voltage exceeding 0.45V must be applied. The ON/OFF control signal can be driven by a PWM controller and using an
NPN transistor to pin 1 to shut it down.
AL6562
Document Number: DS37542 Rev. 2 - 2
11 of 16
www.diodes.com
February 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AL6562.PDF ] | |
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