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PDF AL6562A Data sheet ( Hoja de datos )
| Número de pieza | AL6562A | |
| Descripción | Transition Mode PFC LED Controller | |
| Fabricantes | Diodes | |
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AL6562A
Description
Features
Transition Mode PFC LED Controller
The AL6562A 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 AL6562A 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 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 1
8 Vcc
COMP 2 AL6562A 7 GD
MULT 3
6 GND
CS 4
5 ZCD
SO-8
Applications
Electronic Single-Stage LED Driver
PFC pre-regulators for:
IEC61000-3-2 compliant SMPS (Flat TV,
monitors, desktop PC, games)
HI-END AC-DC adapter/charger up to 350W
Electronic ballast
Entry level server & web server
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
L 2 160 H
F1
2.5A/ 250V
L 1 C1
500 H 220nF/275V
NTC
JC 1
85 to 265V AC
L N GND
R3
D 1 1M
C2
220nF
500V
C3
330nF
500V
R4
680K
R5
10K
L3
R 6 180K
R 7 180K
D3
1N 4148
C6 R8
12nF 100
R14
12K
R9
Z1 68K
18V
ZCD COMP
VCC
C7
680nF
C8
330nF
R13
INV 10
GD
C10
22 F
25V
MULT
C4
100nF
GND
CS
U1
AL6562A
D 2 MUR460
R1
820K
R2
470K
JC 2
Q1
11N65C3
R10
8.2K
C9
47F
450V
R16
0.33/1W
Figure 1 High Power Factor Boost application circuit
AL6562A
Document Number: DS38122 Rev. 1-2
1 of 16
www.diodes.com
September 2015
© Diodes Incorporated
1 page  
AL6562A
Electrical Characteristics
Symbol
Parameter
Conditions
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 (Note 6)
Current Sense Clamp
VCS-offset
Current Sense Offset
GATE DRIVER
VCS = 0
VCOMP = upper clamp
VMULT = 0
VMULT = 2.5V
VOL
VOH
tf
tr
VOclamp
Vos
Notes:
6.
7.
Output Low Dropout Voltage
IGDsink = 200 mA (Note 6)
Output High Dropout Voltage
IGDsource = 200 mA (Note 6)
Voltage Fall Time (Note 6)
IGDsource = 20 mA
Voltage Rise Time (Note 6)
Output Clamp Voltage
ISOURCE = 5 mA, VCC =20 V
UVLO Saturation
VCC =0 V to VCCon,
ISINK = 10 mA
These parameters, although guaranteed by design, are not 100% tested in production.
The multiplier output is given by: current sense comparator O/P,
Min
35
2.1
1.6
9
.
Typ
40
2.25
200
1.7
30
5
0.9
2.5
2.0
30
60
11
Max
45
2.4
-1
350
1.8
1.9
3.0
2.8
70
110
13
1.1
Units
µA
V
µA
ns
V
mV
V
V
V
ns
ns
V
V
.
AL6562A
Document Number: DS38122 Rev. 1-2
5 of 16
www.diodes.com
September 2015
© Diodes Incorporated
5 Page 
AL6562A
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 AL6562A 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 AL6562A 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, doubles its function as a not-latched IC disable: a voltage below 0.3V shuts down the IC and
reduces its consumption at a lower value. In order to restart the system, a voltage exceeding 0.48V must be applied. The main usage of this
function is a remote ON/OFF control interface that can be driven by a PWM controller for power management purposes. However it also offers
a certain degree of additional safety since it will make IC shutdown in case the lower resistor of the output divider is shorted to ground or if the
upper resistor is missing or fails open.
AL6562A
Document Number: DS38122 Rev. 1-2
11 of 16
www.diodes.com
September 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AL6562A.PDF ] | |
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