LNK362-364
®
LinkSwitch-XT Family
Energy Efficient, Low Power
Off-Line Switcher IC
Product Highlights
+
+
Optimized for Lowest System Cost
DC
Output
•
Proprietary IC trimming and transformer construction
techniques enable Clampless™ designs with LNK362
for lower system cost, component count and higher
efficiency
LinkSwitch-XT
Wide Range
HV DC Input
LNK362
D
S
FB
•
•
Fully integrated auto-restart for short circuit and
open loop protection
Self-biased supply – saves transformer auxiliary winding
and associated bias supply components
BP
•
•
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
PI-4086-081005
a) Clampless flyback converter with LNK362
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+
DC
Output
•
Features Superior to Linear/RCC
LinkSwitch-XT
LNK363-364
•
Accurate hysteretic thermal shutdown protection –
automatic recovery improves field reliability
Universal input range allows worldwide operation
Simple ON/OFF control, no loop compensation needed
Eliminates bias winding – simpler, lower cost
transformer
Wide Range
HV DC Input
D
FB
•
•
•
BP
S
PI-4061-081005
b) Flyback converter with LNK363/4
•
•
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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
Figure 1. Typical Application with LinkSwitch-XT.
OUTPUT POWER TABLE(4)
230 VAC ±15%
85-265 VAC
EcoSmart®– Extremely Energy Efficient
PRODUCT(3)
Open
Adapter(1)
Open
Frame(2)
Adapter(1)
Frame(2)
•
•
•
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
LNK362P or G
LNK363P or G
LNK364P or G
2.8 W
5 W
2.8 W
7.5 W
9 W
2.6 W
3.7 W
4 W
2.6 W
4.7 W
6 W
5.5 W
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.
Applications
•
Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio players, and shavers
Supplies for appliances, industrial systems, and metering
•
Description
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.
LinkSwitch-XTincorporatesa700VpowerMOSFET,oscillator,
simpleON/OFFcontrolscheme,ahighvoltageswitchedcurrent
source, frequency jittering, cycle-by-cycle current limit and
December 2005