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PDF LNK403EG Data sheet ( Hoja de datos )
| Número de pieza | LNK403EG | |
| Descripción | LED Driver IC | |
| Fabricantes | Power Integrations | |
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LNK403-409EG
LinkSwitch®-PH Family
LED Driver IC with TRIAC Dimming, Single-Stage PFC and
Primary-Side Constant Current Control
Product Highlights
Dramatically Simplifies Off-line LED Drivers
• Flicker-free phase-controlled TRIAC dimming
• Single stage power factor corrected and accurate constant
current (CC) output
• Eliminates optocoupler and all secondary current control
circuitry
• Eliminates all control loop compensation circuitry
• Simple primary-side PWM dimming interface
• Universal input voltage range
• Enables designs that are electrolytic-free
Accurate and Consistent Performance
• Compensates for transformer inductance tolerances
• Compensates for line input voltage variations
• Frequency jittering greatly reduces EMI filter size and costs
Advanced Protection and Safety Features
• Auto-restart for short-circuit protection
• Open circuit fault detection mode
• Automatic thermal shutdown restart with hysteresis
• Meets high voltage creepage requirement between DRAIN and
all other signal pins both on PCB and at package
EcoSmart® – Energy Efficient
• Low standby power remote ON/OFF feature
(<50 mW at 230 VAC)
• No current sense resistors – maximizes efficiency
• High efficiency operation, >85% achievable
Green Package
• Halogen free and ROHS compliant package
Applications
• Off-line LED driver
Description
The LinkSwitch-PH dramatically simplifies implementation of LED
drivers requiring PF >0.9, TRIAC dimmer capability and high
efficiency. The single-stage PF and constant current controller
eliminates passive circuitry required for power factor correction
and electrolytic bulk capacitor. The advanced primary-side control
techniques used by the LinkSwitch-PH device provide accurate
constant current control while eliminating the need for an
optocoupler and secondary-side current control circuitry.
AC
IN D V LinkSwitch-PH
CONTROL
BP
S R FB
Figure 1. Typical Application Schematic.
PI-5430-060710
Output Power Table1,2
Product
85-265 VAC
Minimum Output Power3 Maximum Output Power4
LNK403EG
LNK404EG
LNK405EG
LNK406EG
LNK407EG
LNK408EG
LNK409EG
6.5 W
6.5 W
8.5 W
10 W
12 W
16 W
18 W
12 W
15 W
18 W
22 W
25 W
35 W
50 W
Table 1. Output Power Table.
Notes:
1. Continuous power in an open frame with adequate heat sinking at device local
ambient of 70 °C.
2. Power level calculated on typical LED string voltage with efficiency >80%.
3.
4.
MMianximimuummoouutptpuuttppoowweerrwwitihthCCBBPP==1100m0Fm. F.
LNK403EG CBP = 10 mF.
LinkSwitch-PH incorporates a 725 V power MOSFET, a
continuous-mode PWM controller, a high voltage switched
current source for self biasing, frequency jittering, cycle-by-cycle
current limit and hysteretic thermal shutdown circuitry, all in a
monolithic IC.
www.powerint.com
June 2010
http://www.Datasheet4U.com
1 page  
LNK403-409EG
Application Example
14 W TRIAC Dimmable High Power Factor LED Driver
Design Example
The circuit schematic in Figure 6 shows a TRIAC dimmable high
power-factor LED driver based on LNK406EG from the
LinkSwitch-PH family of devices. It was optimized to drive an
LED string at a voltage of 28 V with a constant current of 0.5 A
(±5%) ideal for PAR lamp retro-fit applications. The design
operates over a universal input voltage range of 90 VAC to
265 VAC but provides the specified output current tolerance
over a line voltage range of 90 VAC to 132 VAC (this is configurable
for high line only applications by simple component value changes).
The key goals of this design were compatibility with standard
leading edge TRIAC AC dimmers, very wide dimming range
(1000:1, 500 mA:0.5 mA), high efficiency (>85%) and high power
factor (>0.9). The design is fully protected from faults such as
no-load, overload and output short-circuit conditions and over
temperature.
Circuit Description
The LinkSwitch-PH device (U1) integrates the power MOSFET,
controller and start-up functions into a single package reducing
the component count versus typical implementations. Configured
as part of an isolated continuous conduction mode flyback
converter, U1 provides high power factor via its internal control
algorithm together with the small input capacitance of the
design. Continuous conduction mode operation results in
reduced primary peak and RMS current. This both reduces
EMI noise, allowing simpler, smaller EMI filtering components and
improves efficiency. Output current regulation is maintained
without the need for secondary side sensing which eliminates
current sense resistors and improves efficiency.
Input Stage
Fuse F1 provides protection from component failures while RV1
provides a clamp during differential line surges, keeping the
peak drain voltage of U1 below the 725 V rating of the internal
power MOSFET. Bridge rectifier BR1 rectifies the AC line
voltage. EMI filtering is provided by L1-L3, C1, R16 and R17
together with the safety rated Y class capacitor (C7) that bridges
the safety isolation barrier between primary and secondary.
Resistor R16 and R17 act to damp any resonances formed
between L1, L2, C1 and the AC line impedance. A small bulk
capacitor (C2) is required to provide a low impedance source for
the primary switching current. The maximum value of C1 and
C2 is limited in order to maintain a power factor of greater than 0.9.
LinkSwitch-PH Primary
To provide peak line voltage information to U1 the incoming
rectified AC peak charges C3 via D2. This is then fed into the
VOLTAGE MONITOR pin of U1 as a current via R2 and R3. This
sensed current is also used by the device to set the line input
overvoltage and undervoltage protection thresholds. Resistor
R1 provides a discharge path for C3 with a time constant much
longer than that of the rectified AC to prevent generation of line
frequency ripple.
The VOLTAGE MONITOR pin current and the FEEDBACK pin
current are used internally to control the average output LED
current. For TRIAC phase-dimming applications a 49.9 k
resistor (R4) is used on the REFERENCE pin and 4 M (R2+R3)
on the VOLTAGE MONITOR pin to provide a linear relationship
between input voltage and the output current and maximizing
the dimming range. Resistor R4 also sets the internal line input
undervoltage and overvoltage protection thresholds.
F1
L 3.15 A
90 - 265
VAC RV1
275 VAC
N
R16
1 kΩ
L1
1000 µH
L2
1000 µH
R17
1 kΩ
L3
1000 µH
R9
750 kΩ
1%
BR1
2KBP06M
600 V
R10
750 kΩ
1%
R18
510 Ω
1W
C1
47 nF
275 VAC
C11
220 nF
630 V
D1
DL4002
R11
2.4 MΩ
Q1
FMMT558
C6
15 nF
50 V
VR2
ZMM5245B-7
15 V
R12
15 Ω
1%
Q2
IRFR310
R13
130 Ω
1/2 W
R1
240 kΩ
1/2 W
D2
DL4007
VR1
1.5KE200A
D3
UF4007
C2
100 nF
630 V
R2
2 MΩ
1%
R3
2 MΩ
1%
C3
1 µF
400 V
D
LinkSwitch-PH
U1
LNK406EG
D4
UF4002
D5
1N4148
R5
V 3 kΩ
CONTROL
BP
S R FB
R4
49.9 kΩ
1%
C4
10 µF
16 V
11 FL1
C8 C10
330 µF 330 µF R15
50 V 50 V 20 kΩ
D8
MBRS4201T3G
1 FL2
3
T1
RM8
2
R8 D6
150 Ω DL4936
R7
10 kΩ
C5
22 µF
50 V
28 V, 500 mA
RTN
R6
162 kΩ
1%
Q3
MMBT3904
VR3
ZMM5259B-7
39 V
R19
1 kΩ
C13
100 nF
50 V
R20
10 kΩ
D7
BAV21WS-7-F
C12
1 µF
50 V
C7
2.2 nF
250 VAC
PI-5997-060910
Figure 6. Schematic of an Isolated, TRIAC Dimmable, High Power Factor, Universal Input, 14 W LED Driver.
www.powerint.com
5
Rev. A 060910
5 Page 
LNK403-409EG
Layout Considerations
Primary Side Connections
Use a single point (Kelvin) connection at the negative terminal of
the input filter capacitor for the SOURCE pin and bias returns.
This improves surge capabilities by returning surge currents
from the bias winding directly to the input filter capacitor. The
BYPASS pin capacitor should be located as close to the
BYPASS pin and connected as close to the SOURCE pin as
possible. The SOURCE pin trace should not be shared with the
main power MOSFET switching currents. All FEEDBACK pin
components that connect to the SOURCE pin should follow the
same rules as the BYPASS pin capacitor. It is critical that the
main power MOSFET switching currents return to the bulk
capacitor with the shortest path as possible. Long high current
paths create excessive conducted and radiated noise.
Secondary Side Connections
The output rectifier and output filter capacitor should be as
close as possible. The transformer’s output return pin should
have a short trace to the return side of the output filter
capacitor.
Input EMI Filter
R2
F1
L RV1
N
L1 C2
L2
Bulk Capacitor
R14
L3
C9
Clamp
FL1
LNK403EG
6
1
VR1
C3
C8
D1
U1
2
T1
Transformer
5
4
3
C7
C12
R3
R16
Copper Area for
Heat Sinking
Figure 11. RD-193 7 W Layout Example, Top Layer.
VR3
R24
C14
C5
D8R10
C6
V
BYPASS Pin
Capacitor
Output
C4 Filter
Capacitors
V
PI-5987-060110
www.powerint.com
11
Rev. A 060910
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LNK403EG.PDF ] | |
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