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PDF LNK460 Data sheet ( Hoja de datos )
| Número de pieza | LNK460 | |
| Descripción | LED Driver IC with TRIAC Dimming Single-Stage PFC and Constant Current Control | |
| Fabricantes | Power Integrations | |
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LNK454/456-458/460
LinkSwitch®-PL Family
LED Driver IC with TRIAC Dimming, Single-Stage PFC and
Constant Current Control for Non-Isolated Applications
www.DataSheet4U.com
Product Highlights
Dramatically Simplifies Off-line LED Drivers
• Single stage power factor correction and accurate constant
current (CC) output
• Flicker-free phase-controlled TRIAC dimming
• Very low component count with small non-electrolytic bulk
capacitor, for compact replacement lamp designs
• Compact SO8 package
• Completely eliminates control loop compensation
Advanced Performance Features
• Optimized for non-isolated flyback designs
• Frequency jitter greatly reduces EMI filter size and costs
• Low dissipation direct sensing of LED current
Advanced Protection and Safety Features
• 725 V integrated MOSFET allows small bulk capacitance and
maximizes power capability
• Latching shutdown protection for short-circuit / open feedback
and output overvoltage
• Auto-restart for overload condition
• Hysteretic thermal shutdown
• Meets high-voltage creepage between DRAIN and all other pins
both on PCB and at package
EcoSmart® - Energy Efficient
• High power factor optimizes system lumen per watt by
reducing input VA
• Control algorithm balances switching and conduction losses
over line and load to maintain optimum efficiency
• Cycle skipping regulation for abnormally low output power to
clamp peak output current delivered
Description
The LinkSwitch-PL family enables a very small and low cost
single-stage power factor corrected constant current driver for
solid state lighting. Optimized for direct LED current sensing, the
LinkSwitch-PL operates over a wide input voltage range
delivering an output power of up to 16 W. The LinkSwitch-PL
control algorithm provides flicker-free TRIAC dimming with minimal
external components.
Each device incorporates a 725 V rated power MOSFET, a novel
discontinuous mode variable frequency variable on-time controller,
frequency jitter, cycle by cycle current limit and hysteretic thermal
shutdown in a monolithic 4-pin IC, available in SO-8C and
eDIP-12 packages.
AC
IN D LinkSwitch-PL
CONTROL
BP
S FB
Figure 1. Basic Application Schematic.
PI-5835-060710
Output Power Table
Product 2
LNK454D
LNK456D
LNK457D/V
LNK458V
LNK460V
85-265 VAC
Minimum Output
Power1
Maximum Output
Power1
1.5 W
3W
3W 6W
4W 8W
6 W 11.5 W
8 W 16 W
Table 1. Output Power Table.
Notes:
1. Maximum practical continuous power in an open frame design with adequate
heat sinking, measured at +50 °C ambient (see Key Applications Considerations
for more information).
2. Packages: D: SO-8C, V: eDIP-12.
Output Current
Number of
Serial LEDs
1
2
3
4
5
6
7
8
9
10
11
12
350 mA
LNK454
LNK454
LNK456
LNK456
LNK457
LNK457
LNK458
LNK458
LNK458
LNK460
LNK460
LNK460
500 mA
LNK454
LNK456
LNK456
LNK457
LNK458
LNK458
LNK460
LNK460
LNK460
700 mA
LNK454
LNK456
LNK457
LNK458
LNK460
LNK460
1000 mA
LNK456
LNK457
LNK458
LNK460
Figure 2. Device Selection based on Length of Output LED Series String and
Current. A Typical Voltage Drop of 3.5 V per LED is Assumed.
www.powerint.com
PRELIMINARY
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
June 2010
1 page  
LNK454/456-458/460
www.DataSheet4U.com
IC Supply and BYPASS Pin
The internal 5.85 V regulator charges the bypass capacitor
connected to the BYPASS pin to 5.85 V by drawing current
from the voltage on the DRAIN pin whenever the power MOSFET
is off. The BYPASS pin is the internal supply voltage node.
When the power MOSFET is on, the device operates from the
energy stored in the bypass capacitor. Extremely low power
consumption of the internal circuitry allows LinkSwitch-PL to
operate continuously from current it takes from the DRAIN pin. A
bypass capacitor value of 1 µF is sufficient for both high
frequency decoupling and energy storage.
During phase angle dimming when the conduction angle is
small the AC input voltage is present for only short periods of
time. In that case the IC should not rely on the integrated high
voltage current source, but instead external bias circuitry should
be
4).
used
If the
tooustpuputpvlyotlthaegIeCisfrloemsstthheaonu7tpVu, te(xDteESrnaanldbRiaEsS
in Figure
circuitry
should be implemented, by using a bias winding on the primary
of the transformer with a small signal rectifier and an electrolytic
capacitor with a value based on maximum IC consumption and
maximum phase dimming conduction angles.
Start-up, Switching Frequency, On-time Range
At start-up the controller uses an initial switching
acnadpamciitnoimr tuomgeothne-trimweithtOtNh(MeIN)e. nTehrgeycdhealrigveinrgy
of
to
the
the
frequency
output
fMIN
output LEDs
as soon as their anode-cathode threshold is reached
determines a step-by-step increase of the operating power
MOSFET switching frequency and on-time every half-cycle of
the main input voltage.
When the operating conditions (start-up or large transients)
allow for only low energy processing (low frequency and on-time),
the voltage across the input bulk capacitance will not reach zero
even if the main voltage crosses zero. During these conditions the
IC sets the reference voltage on the FEEDBACK pin to one half
of its preset level (145 mV), to avoid overshoot of the output LED
current. Once the FEEDBACK pin voltage exceeds this reduced
threshold (with the zero crossing on the bulk capacitor being
achieved), then the FEEDBACK pin voltage is restored to the
normal 290 mV level.
The steady state switching frequency and on-time is determined
by the line voltage, voltage drop across the LEDs and system
overall power transfer efficiency.
At light load when the device reaches the minimum frequency
fcMyINclaensd.
oInnt-htiims emtoOdN(eMINo),f
the controller
operation the
regulates by skipping
input current is not power
factor corrected and the average output current is not
guaranteed to fall within the normal range. The FEEDBACK pin
cycle skipping threshold is reduced from approximately twice
the normal regulation level down to just above the level required
to limit output power delivery under these conditions. A
properly designed supply will not operate in this mode under
normal load conditions. A power supply designed correctly will
oatonpaeornna-otetrimmweaitlhflaoinllaintdhg.ebsewtwitceheinngtOfNr(eMqINu) aenndcytOrNa(MnAgXe) w[fhMIeNn…cofMnAnXe],cwteitdh
Overload Protection
In case of overload, the system will increase the operating
frequency and on-time each AC half-cycle until the maximum
frequency and maximum on-time are reached. When this state
is reached, by the next half-cycle, the controller will enter
auto-restart protection, thus inhibiting the gate of the power
MOSFET for approximately 1.28 s if the main line frequency is
50 Hz, 1.02 s if it is 60 Hz. After this auto-restart off-time
expires, the circuit will start again, exactly as at start-up, i.e. at
fMIN and tON(MIN), stepping up until regulation is achieved again.
In case of a persistent overload condition, the auto-restart duty
cycle DCAR will typically be as low as 33%.
Auto-restart is inhibited during phase dimming when the TRIAC
conduction duty cycle is less than 60%.
Output Overvoltage Protection
If a no-load condition is present on the output of the supply, the
otahpurptepesuahtrooaldvcerisorvsroselattahcgeheeFdEZ.EenDAeBvrAo(DCltaZKgOpVeiinnVOaFVnigdinutrehexec4Ie)CswwsilliollcfloaVtncFBdh(LuOoc)ft=f.o2NncVoerwmitiaslll
operation will be restored once the BYPASS pin voltage drops
below 4.9 V and the IC goes through a new start-up phase.
Output Short-Circuit
If the output of the supply (i.e. the LED load) is short-circuited,
then a large amount of energy will be delivered to the sense
resistor, generating a high voltage at the FEEDBACK pin. If this
condition develops more than 2 V on the FEEDBACK pin, then
the IC will interpret this event as an output short-circuit and will
trigger latching shutdown. Normal operation will resume after
cycling the AC input such that the BYPASS pin voltage drops
below 4.9 V and the IC goes through a new start-up phase.
Safe Operating Area (SOA) Protection
If 3 consecutive cycles of the power MOSFET are prematurely
terminated due to the power MOSFET current exceeding the
current limit after the leading edge blanking time, SOA protection
mode is triggered and the IC will trigger latching shutdown.
Normal operation will resume after cycling the AC input such that
the BYPASS pin voltage drops below 4.9 V and the IC goes
through a new start-up phase.
Hysteretic Thermal Shutdown
The thermal shutdown circuitry senses the die junction
temperature. The thermal shutdown threshold is set to 142 °C
typical with a 75 °C hysteresis. When the die temperature rises
above this threshold (142 °C) the power MOSFET is disabled
and remains disabled until the die temperature falls by 75 °C, at
which point the power MOSFET is re-enabled.
www.powerint.com
PRELIMINARY
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
5
Rev. A 06/10
5 Page 
LNK454/456-458/460
www.DataSheet4U.com
eDIP-12 (V Package)
Pin #1 I.D.
(Laser Marked)
0.316 [8.03]
Ref.
2X 1 2 3 4 5 6
0.004 [0.10] C B
Seating Plane C
0.010 [0.25] Ref.
2
0.350 [8.89]
0.412 [10.46]
0.213 [5.41]
Ref.
Ref.
0.306 [7.77]
Ref.
0.004 [0.10] C A
0.016 [0.41]
0.011 [0.28]
12×
2
0.400 [10.16]
61
A
0.059 [1.50]
Ref, typ.
7
0.400 [10.16]
8
0.436 [11.08]
0.406 [10.32]
0.059 [1.50]
Ref, typ.
B 12 11 10 9 8 7
TOP VIEW
0.019 [0.48]
Ref.
H
0.031 [0.80]
0.028 [0.72]
0.356 [9.04]
Ref.
0.049 [1.23]
0.046 [1.16]
0.192 [4.87]
Ref.
0.070 [1.78]
SIDE VIEW
Detail A
0.104 [2.65] Ref.
5 °± 4°
END VIEW
0.092 [2.34]
0.086 [2.18]
0.022 [0.56]
Ref.
0.020 [0.51]
Ref.
0.028 [0.71]
Ref.
DETAIL A (Not drawn to scale)
7
12
0.023 [0.58]
0.018 [0.46]
3
12×
4
0.010 (0.25) M C A B
BOTTOM VIEW
Notes:
1. Dimensioning and tolerancing
per ASME Y14.5M-1994.
2. Dimensions noted are determined
at the outermost extremes of the plastic
body exclusive of mold flash, tie bar
burrs, gate burrs, and interlead flash,
but including any mismatch between the
top and bottom of the plastic body. Maximum
mold protrusion is 0.010 [0.25] per side
3. Dimensions noted are inclusive of
plating thickness.
4. Does not include inter-lead flash or
protrusions.
5. Controlling dimensions in inches (mm).
6. Datums A & B to be determined at Datum H.
7. Measured with the leads constrained to be
perpendicular to Datum C.
8. Measured with the leads unconstrained.
9. Lead numbering per JEDEC SPP-012.
PI-5556-051010
Part Ordering Information
LNK 454 D G
• LinkSwitch Product Family
• PL Series Number
• Package Identifier
D SO-8C
V eDIP-12
• Package Material
G GREEN: Halogen Free and RoHS Compliant
www.powerint.com
PRELIMINARY
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
11
Rev. A 06/10
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LNK460.PDF ] | |
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