LNK362-364
®
LinkSwitch-XT
Family
Energy Efficient, Low Power
Off-Line Switcher IC
Product Highlights
Optimized for Lowest System Cost
• Proprietary IC trimming and transformer construction
techniques enable
Clampless™
designs with LNK362
for lower system cost, component count and higher
efficiency
• Fully integrated auto-restart for short circuit and
open loop protection
• Self-biased supply – saves transformer auxiliary winding
and associated bias supply components
• Frequency jittering greatly reduces EMI
• Meets HV creepage requirements between DRAIN and
all other pins both on the PCB and at the package
• Lowest component count switcher solution
Features Superior to Linear/RCC
• Accurate hysteretic thermal shutdown protection –
automatic recovery improves
fi
eld reliability
• Universal input range allows worldwide operation
• Simple ON/OFF control, no loop compensation needed
• Eliminates bias winding – simpler, lower cost
transformer
• Very low component count – higher reliability and single
side printed circuit board
• Auto-restart reduces delivered power by 95% during
short circuit and open loop fault conditions
• High bandwidth provides fast turn on with no overshoot
and excellent transient load response
EcoSmart
– Extremely Energy Efficient
• Easily meets all global energy efficiency regulations with
no added components
• No-load consumption
<300
mW without bias winding at
265 VAC input (<50 mW with bias winding)
• ON/OFF control provides constant efficiency to very
light loads – ideal for mandatory CEC regulations
®
+
DC
Output
+
Wide Range
HV DC Input
LinkSwitch-XT
LNK362
D
FB
BP
S
a) Clampless flyback converter with LNK362
PI-4086-081005
+
DC
Output
+
Wide Range
HV DC Input
LinkSwitch-XT
LNK363-364
D
FB
BP
S
b) Flyback converter with LNK363/4
PI-4061-081005
Figure 1. Typical Application with LinkSwitch-XT.
OUTPUT POWER TABLE
(4)
230 VAC ±15%
PRODUCT
(3)
85-265 VAC
Adapter
(1)
2.8 W
5W
5.5 W
Open
Open
(1)
(2)
Adapter
Frame
Frame
(2)
2.8 W
7.5 W
9W
2.6 W
3.7 W
4W
2.6 W
4.7 W
6W
LNK362P or G
LNK363P or G
LNK364P or G
Applications
• Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio players, and shavers
• Supplies for appliances, industrial systems, and metering
Table 1.
Notes:
1.
Minimum continuous power in a typical non-
ventilated enclosed adapter measured at 50 °C ambient.
2.
Minimum
practical continuous power in an open frame design with adequate
heat sinking, measured at 50 °C ambient.
3.
Packages: P: DIP-8B,
G: SMD-8B. Please see Part Ordering Information.
4.
See Key
Application Considerations section for complete description of
assumptions.
Description
LinkSwitch-XT
incorporates 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 onto a monolithic IC. The start-up
and operating power are derived directly from the DRAIN
pin, eliminating the need for a bias winding and associated
circuitry.
December 2005
POWERINT [ POWER INTEGRATIONS, INC. ]
