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PDF LYT0002 Data sheet ( Hoja de datos )
| Número de pieza | LYT0002 | |
| Descripción | (LYT0002 - LYT0006) Off-Line Low Power LED Driver IC | |
| Fabricantes | Power Integrations | |
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LYT0002/0004-0006
LYTSwitch™-0 Off-Line Low Power
LED Driver IC Family
Lowest Component Count, Off-Line Switcher IC for Non-Isolated
LED Lighting Applications
Product Highlights
• High power factor meeting EU and USA requirements
• Very low component count
• Frequency jitter reduces EMI
• No bias supply or transformer required
Cost-Effective LED driver
The LYTSwitch-0 family parts are a highly integrated combination
of controller, driver and switching power MOSFET that enable low
component-count, non-isolated switching topologies for highly
cost competitive LED lighting applications.
FB BP
DS
LYTSwitch-0
VIN
(a)
PI-6810-060613
66 kHz operation together with frequency jittering insures a very
low-cost EMI filter. Less than <50 ms start-up time turn-on
without overshoot, improves end user experience – no delay.
Power Factor Correction
Allows designs that easily meet European and North American
standards for PFC in consumer lighting applications.
Tight CC Performance
Accurate current limit with tight line and load regulation that is
stable over a wide temperature range makes the LYTSwitch-0
ideal for LED lighting applications.
Comprehensive Protection
Integrated auto-restart for short-circuit, open-circuit and open-
loop faults as well as a high threshold over-temperature
protection feature (min. 135 °C) with automatic restart provide
extensive protection at no additional cost.
LYTSwitch-0 Supports Different LED Applications
Flyback, buck, buck-boost and boost architectures are all
supported by the LYTSwitch-0 family. The 700 V switching power
MOSFET supports an input voltage range of 85 VAC to 308 VAC.
Description
The LYTSwitch-0 family is specifically designed for low cost LED
bulb replacement applications. LYTSwitch-0 devices integrate a
700 V power MOSFET, oscillator, simple ON/OFF control scheme,
a high-voltage switched current source, frequency jittering,
cycle-by-cycle current limit and thermal shutdown circuitry into a
monolithic IC.
The start-up and operating power are derived directly from the
voltage on the DRAIN pin. This eliminates the need for a bias
supply and associated circuitry plus allowing low-cost discrete
inductors to be used. The fully integrated auto-restart circuit in
the LYTSwitch-0 family safely limits output power during fault
conditions such as short-circuit or open-loop, reducing component
count and lower system cost. Package options for thru-hole and
surface-mount suit different manufacturing requirements.
FB BP
+D
S
LYTSwitch-0
VIN
PI-6819a-060613
(b)
Figure 1. Typical Application Schematic (a) Buck, (b) Buck-Boost.
http://www.DataSheet4U.net/
Output Current Table1
Product6
LYT0002
LYT0004
LYT0005
LYT0006
PF4,5
High
Low
High
Low
High
Low
High
Low
230 VAC ±15%
MDCM2
CCM3
45 mA 65 mA
63 mA 80 mA
85 mA 110 mA
98 mA 139 mA
100 mA 140 mA
120 mA 170 mA
165 mA 220 mA
200 mA 280 mA
85-308 VAC
MDCM2
CCM3
30 mA
40 mA
63 mA
80 mA
50 mA
70 mA
98 mA 139 mA
60 mA
90 mA
120 mA 170 mA
100 mA 140 mA
200 mA 280 mA
Table 1. Output Current Table.
Notes:
1. Typical output current in a non-isolated buck converter. See Key Applications
Considerations section for more information.
2. MCM – mostly discontinuous mode.
3. CCM – continuous conduction mode.
4. PF high: >0.7 @ 120 VAC and >0.5 @ 230 VAC.
5.
6.
PF low: for
Packages:
non-PF application where
P: PDIP-8B, D: SO-8C.
CIN
>5
mF
minimum.
SO-8C (D Package)
Figure 2. Package Options.
PDIP-8B (P Package)
www.powerint.com
June 2013
datasheetpdf-http://www.DataSheet4U.net/
1 page  
LYT0002/0004-0006
600
500
400
VDRAIN
300
200
100
0
68 kHz
64 kHz
0
Figure 5. Frequency Jitter.
Time (µs)
20
high. If the FEEDBACK pin is not pulled high for 50 ms, the
power MOSFET switching is disabled for 800 ms. The auto-
restart alternately enables and disables the switching of the
power MOSFET until the fault condition is removed.
Applications Example
A 6 W (Output) Universal Input Buck LED Driver Converter
The circuit shown in Figure 6 is a typical implementation of a
non-isolated, power factor corrected buck power supply for
LED driver applications. The simplicity and low component
count make this ideal for space constrained, cost sensitive
designs such as GU10 or A19 size lamps. This design was
optimized to drive an LED string at a voltage of 54 V with a
constant current of 110 mA, giving 6 W of output power. The
design operates over a universal input range from 90 VAC to
265 VAC and achieves an output current tolerance of < ±5%
at nominal line voltage. The input capacitance (C1 + C2) was
reduced to achieve the highest possible power factor input
while still meeting conducted EMI limits. Power factor is >0.5
at 230 VAC and >0.7 PF at 120 VAC meeting requirements for
LED lamps in Europe and USA.
The input stage comprises fusible resistor RF1, bridge rectifier
BR1, capacitors C1 and C2, and inductor L1. Resistor RF1 is a
flame proof, fusible, wire wound resistor. It accomplishes
several functions: a) Inrush current limitation to below specification
of BR1; b) Differential mode conducted EMI noise attenuation; c)
Fuse should any other component fail short-circuit; d) Higher
power factor. Capacitor C1, C2 and inductor L1 forms a π filter
to reduce differential mode EMI. Capacitor C2 provides local
decoupling for the switching current through U1. There is an
optional parallel resistor on the board across L1 which damps
the resonance of the pi filter.
The power processing stage is formed by the integrated
MOSFET switch within LYT0006 (U1), a free-wheeling diode
(D1), sense resistor (R2), power inductor (L2) and output
capacitor (C5). To reduce reverse recovery losses in D1 the
value of L2 was designed such that the converter operates in
mostly discontinuous conduction mode. Diode D1 is an
ultrafast diode with a reverse recovery time (tRR) ≈35 ns. This
recovery is recommended due to the high ambient operating
time temperature which will increase diode reverse recovery
charge. A bobbin based EE10 core size indictor was selected
for L2 in order to prevent changes in inductance value when
placed inside a metal enclosure. Lower cost drum core or dog
bone inductor types may also be used, however these have an
open magnetic path which can be shorted by a metal enclosure.
This reduces the effective inductance and requires the value to
be adjustedhttp://www.DataSheet4U.net/ to take this into account when placed inside the
final enclosure.
Capacitor C5 is the output filter capacitor; its primary function is
to limit the output current ripple and ensures high frequency
currents flow within as small as a loop area as possible to
reduce EMI.
RF1
L 4.7 Ω
BR1
MB6S
600 V
90 - 265
VAC
N
RV1*
275 VAC
R1
4.7 kΩ
L1
4.7 mH
C1
47 nF
630 V
FB BP
DS
LYTSwitch-0
U1
LYT0006P
C2
330 nF
450 V
C3
100 nF
25 V
C4
22 µF
16 V
R2
18.7 Ω
1%
54
L2
C5
47 µF
63 V
D1
MURS160T3G
54 V, 110 mA
+
*Optional <1 kV Surge Requirements
Figure 6. Universal Input, 54 V, 110 mA Constant Current Power Supply using LYTSwitch-0.
www.powerint.com
PI-6998f-061313
RTN
5
Rev. A 06/13
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
LYT0002/0004-0006
Parameter
Conditions
Symbol
SOURCE =S0eeV;FTigJ u=re-480 to 125 °C
Min
Typ
Max
Units
(Unless Otherwise Specified)
Output
ON-State
Resistance
OFF-State Drain
Leakage Current
RDS(ON)
IDSS
LYT0002
ID = 13 mA
LYT0004
ID = 25 mA
LYT0005
ID = 35 mA
LYT0006
ID = 45 mA
VBP = 6.2 V,
VFB ≥2 V,
VDS = 560 V,
TJ = 25 °C
TJ = 25 °C
TJ = 100 °C
TJ = 25 °C
TJ = 100 °C
TJ = 25 °C
TJ = 100 °C
TJ = 25 °C
TJ = 100 °C
LYT0002
LYT0004
LYT0005
LYT0006
42 55.2
67 88.4
21 27.6
40 44.2
11 13.8
W
19 22.1
6 8.1
11 12.9
50
60
mA
75
90
Breakdown Voltage
Rise Time
Fall Time
DRAIN Supply Voltage
BVDSS
tR
tF
VBP = 6.2 V, VFB ≥2 V,
TJ = 25 °C
Measured in a Typical Buck
Converter Applicationhttp://www.DataSheet4U.net/
700
50
50
50
V
ns
ns
V
Output Enable Delay
Output Disable
Setup Time
tEN
tDST
See Figure 10
10
0.5
ms
ms
Auto-Restart
ON-Time
Auto-Restart
Duty Cycle
tAR
DCAR
TJ = 25 °C
See Note H
LYT0002
LYT0004-0006
LYT0002
LYT0004-0006
Not Applicable
50
Not Applicable
6
ms
%
NOTES:
A. Total current consumption is the sum of IS1 and IDSS when FEEDBACK pin voltage is ≥2 V (MOSFET not switching) and the sum of
IS2 and IDSS when FEEDBACK pin is shorted to SOURCE (MOSFET switching).
B Since the output power MOSFET is switching, it is difficult to isolate the switching current from the supply current at the DRAIN.
An alternative is to measure the BYPASS pin current at 6 V.
C. See Typical Performance Characteristics section Figure 15 for BYPASS pin start-up charging waveform.
D. This current is only intended to supply an optional optocoupler connected between the BYPASS and FEEDBACK pins and not
any other external circuitry.
E. For current limit at other di/dt values, refer to Figure 14.
F. This parameter is guaranteed by design.
G. This parameter is derived from characterization.
H. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to frequency).
www.powerint.com
11
Rev. A 06/13
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LYT0002.PDF ] | |
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