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
V
IN
FB
D
BP
S
LYTSwitch-0
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.
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.
Figure 1.
(a)
PI-6810-060613
FB
BP
S
+
V
IN
D
LYTSwitch-0
(b)
PI-6819a-060613
Typical Application Schematic (a) Buck, (b) Buck-Boost.
Output Current Table
1
Product
6
LYT0002
LYT0004
LYT0005
LYT0006
Table 1.
PF
4,5
High
Low
High
Low
High
Low
High
Low
230 VAC
±15%
MDCM
45 mA
63 mA
85 mA
98 mA
100 mA
120 mA
165 mA
200 mA
2
85-308 VAC
3
CCM
MDCM
2
30 mA
63 mA
50 mA
98 mA
60 mA
120 mA
100 mA
200 mA
CCM
3
40 mA
80 mA
70 mA
139 mA
90 mA
170 mA
140 mA
280 mA
65 mA
80 mA
110 mA
139 mA
140 mA
170 mA
220 mA
280 mA
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.
www.powerint.com
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. PF low: for non-PF application where C
IN
>5
mF
minimum.
6. Packages: P: PDIP-8B, D: SO-8C.
SO-8C (D Package)
Figure 2.
Package Options.
PDIP-8B (P Package)
June 2013
POWERINT [ POWER INTEGRATIONS, INC. ]
