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PDF BW6562A Data sheet ( Hoja de datos )
| Número de pieza | BW6562A | |
| Descripción | High PFC LED Driver | |
| Fabricantes | Bruckewell Technology | |
| Logotipo |  |
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BW6562A High PFC LED Driver
Features
Single stage fly-back controller with PFC
Transition-mode operation
Ultra-low start-up current
Internal start-up timer
Low operating supply current
Low quiescent current
Disable function on error amplifier (E/A) input
Totem pole, push-pull output drive
Adjustable output over-voltage protection
Under-voltage lockout with hysteresis
1% Precision internal reference voltage
Typical Applications
Fly-back power converters
PFC pre-regulators to meet IEC61000-3-2
Hi-end AC-DC adapter/charger
Electronic single stage LED driver
Electronic Ballast
Product Description
The BW6562A is a cost effective high performance
transition-mode (TM) power factor correction (PFC)
controller IC optimized for high PFC LED driver, battery
chargers and pre-regulator applications. The BW6562A
integrates an internal start-up timer, a highly linear
multiplier with Total Harmonics Distortion (THD) optimizer
for near unity power factor, a Zero Current Detector (ZCD)
to ensure transition-mode operation and a current sensing
comparator with built-in leading edge blanking. With ZCD
control, power MOSFET is always turned on with zero
inductor current. Consequently, transition-mode control
achieves lower switching loss and reduced noise. The
BW6562A offers great protection coverage including
system accurate adjustable over-voltage protection (OVP),
input under-voltage lockout (UVLO), multiplier output clamp
and GD output clamp for external power MOSFET
protection. The totem pole output stage is capable of
delivering sink/source drive current of +800mA/-600mA.
The BW6562A is available in SOP-8 package.
Typical Application Circuit
© 2012 Bruckewell Technology Corp., Ltd.
1
www.bruckewell-semi.com/
http://www.Datasheet4U.com
1 page  
BW6562A High PFC LED Driver
Electrical Characteristics (continued)
(Over recommended operating conditions unless otherwise specified. VCC
Parameter
Symbol
Min.
Typ. Max.
Triggering voltage (Note 5)
VZCDT
0.7
Input bias current
IZCDB
2
Source current capability IZCD(SOURCE)
-2.5
Sink current capability
IZCD(SINK)
2.5
Output over-voltage
12V, TJ
Unit
V
µA
mA
mA
- 25°C ~ +125°C, CO 1nF)
Condition
Negative-going edge
VZCD 1.0V ~ 4.5V
Dynamic OVP triggering
current
Hysteresis (Note 5)
Static OVP threshold
Current sense comparator
IOVP
ΔIOVP
VOVP(TH)
27
20
2.10 2.25 2.40
µA
µA
V
Input bias current
Leading edge blanking
Delay to output
Current sense clamp
Current sense offset
Starter
ICS
tLEB
tD(H-L)
VCS
VCS(OS_0V)
VCS(OS_2.5V)
100
1.00
200
175
1.08
25
5
-1
300
1.16
µA VCS 0V
ns
ns
V
VCOMP Upper clamp,
VMULT 1.5V
mV VMULT 0V
VMULT 2.5V
Start timer period
GATE driver
tSTART
75 190 300
µs
Output low voltage
VOL
0.6
Output high voltage
VOH 9.8 10.3
Peak source current
ISOURCE(PK)
-0.6
Peak sink current
ISINK(PK)
0.8
Voltage fall time
tFALL
30
Voltage rise time
tRISE
60
Output clamp voltage
VO(CLAMP) 10 12
UVLO saturation
VUVLO(SAT)
Note：
4. The multiplier output is given by :
VCS K VMULT (VCOMP – 2.5)
5. Parameters guaranteed by design, functionality tested in production.
1.2
70
110
15
1.1
V ISINK 100mA
V ISOURCE 5mA
A
A
ns
ns
V ISOURCE 5mA, VCC 20V
V VCC 0V ~ VCC(ON), ISINK 2mA
© 2012 Bruckewell Technology Corp., Ltd.
5
www.bruckewell-semi.com/
5 Page 
BW6562A High PFC LED Driver
Example Applications
Single Stage LED Driver with PFC
One of major applications of the BW6562A is to provide a
single stage power module with high PF for LED lighting.
The following circuit, Figure 4, shows a simplified fly-back
AC-DC converter with both constant current (CC) and
constant voltage (CV) feedback from output side, to
prevent overload and also provide an over-voltage
protection facility.
This solution uses an isolated feedback with an opto-
coupler and the SQ7103 (+2.5V voltage reference and
dual Op-Amps), each one for voltage and current
regulation respectively. As LED lighting application, the
BW6562A offers the following advantages that make this
solution an appropriate method against the traditionally
PWM controller, where a good PF value is required :
●The input capacitance can be reduced to replace bulky
and expensive high voltage electrolytic capacitor (as
required by regular offline SMPS) by a small size,
cheaper film capacitor
●Transition-mode ensures low turn-on losses in MOSFET
and higher efficiency can be achieved.
●Lower parts count means lower material cost as well as
lower assembly cost for limited space.
Few details information about this, please refer separate
Application Note for details.
High PF Battery Charger
The single stage PFC can also be adopted as battery
charger. Figure 5 presents an off-line universal mains
battery charger that can drive up to 30W.
This solution also uses an isolated feedback with an opto-
coupler and the BW7103. To use the BW6562A IC in a
lead-acid battery charger circuit with high PFC, the DC
output voltage and the maximum permissible DC output
charging current needs to be decided on the basis of the
specific battery to be charged. For the lead-acid batteries
of different nominal voltages, the fixed constant-voltage,
current limited, charging mode, the typical voltage level
suggested by most lead-acid battery manufactures are as
follows :
© 2012 Bruckewell Technology Corp., Ltd.
11
Nominal
6V
12 V
24 V
48 V
Suggested
Charging
Voltage
6.9 V
13.8 V
27.6 V
55.2 V
Battery
Discharged
5.25 V
10.50 V
21.00 V
42.00 V
The maximum lead-acid battery charging current is
decided by the battery amp-hour capacity, represented
as 'C'. The lead-acid battery manufacturers in general
prefer a low battery charging current set at “C/20” Amp
for slow-charging, for improved life of the battery.
However, in case of ‘fast-charging’ and if permitted by
the battery manufacturer, the maximum battery charging
current can be set at “C/10” Amp. A charge-depleted
battery will initially draw the maximum charging current.
As the battery gradually gets charged, the charging
current will gradually reduce.
The maximum “Current Limit” therefore helps avoid a
battery getting over-heated during charging and thus
avoid damage to the battery. It is advisable to avoid
deep discharge of the lead-acid battery, to increase the
usable battery life. The secondary side feedback
network for the required CV-CC characteristics will
therefore be tailored accordingly in the application
circuit. The advanced battery chargers take into account
the battery temperature while charging the battery and
include appropriate compensation for the same, which is
not in the scope of this document.
PFC Pre-Regulator
Major application of the BW6562A is to implement a
wide-range mains input PFC pre-regulator, which will be
acting the input stage for the cascaded isolation DC-DC
converter, and can deliver above 350W in general.
Typical application circuit diagram is showed on page 1.
There are two methods; in general, to design pre-
regulator stage, one is with fixed frequency while the
other is with fixed on time.
The BW6562A can be implemented by fixed on time due
to its simplicity and less expensive, while the fixed
frequency technique is more complicated and beyond
the scope of this application note. In fixed on time mode,
the BW6562A is also working in transition mode where
the inductor current will be turn on when zero crossing is
detected. By using boost switching techniques, a PFC is
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| PDF Descargar | [ Datasheet BW6562A.PDF ] | |
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