LYT0002 Datasheet, PDF (1/18 Pages) Power Integrations, Inc. – Lowest Component Count, Off-Line Switcher IC for Non-Isolated LED Lighting Applications

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
D
S
LYTSwitch-0
V_IN
(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
V_IN
PI-6819a-060613
(b)
Figure 1. Typical Application Schematic (a) Buck, (b) Buck-Boost.
Output Current Table¹
Product⁶
LYT0002
LYT0004
LYT0005
LYT0006
PF^4,5
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. 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)
www.powerint.com
June 2013