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LNK364 Datasheet Preview

LNK364 Datasheet

(LNK362 - LNK364) Low Power Off-Line Switcher IC

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LNK364 pdf
LNK362-364
LinkSwitch®-XT Family
Energy Efcient, 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
efciency
• 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 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-Efcient
• Easily meets all global energy efciency 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 efciency to very
light loads – ideal for mandatory CEC regulations
Applications
• Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio players, and shavers
• Supplies for appliances, industrial systems, and metering
Description
LinkSwitch-XT incorporates a 700Vpower 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 startup
+ DC +
Output
Wide Range
HV DC Input
LinkSwitch-XT
D LNK362
FB
BP
S
a) Clampless yback converter with LNK362
+
PI-4086-081005
DC +
Output
Wide Range
HV DC Input
LinkSwitch-XT
D LNK363-364
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%
85-265 VAC
PRODUCT(3)
Adapter(1)
Open
Frame(2)
Adapter(1)
Open
Frame(2)
LNK362P/G/D 2.8 W 2.8 W 2.6 W 2.6 W
LNK363P/G/D 5 W
7.5 W 3.7 W 4.7 W
LNK364P/G/D 5.5 W
9W
4W
6W
Table 1. Output Power Table.
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, D: SO-8C. Please see Part
Ordering Information.
4. See Key Application Considerations section for complete description
of assumptions.
and operating power are derived directly from the DRAIN
pin, eliminating the need for a bias winding and associated
circuitry.
November 2008



Power Integrations
Power Integrations

LNK364 Datasheet Preview

LNK364 Datasheet

(LNK362 - LNK364) Low Power Off-Line Switcher IC

No Preview Available !

LNK364 pdf
LNK362-364
BYPASS
(BP)
FAULT
PRESENT
AUTO-
RESTART
COUNTER
CLOCK
RESET
6.3 V
FEEDBACK
(FB)
VFB -VTH
JITTER
CLOCK
DCMAX
OSCILLATOR
Figure 2. Functional Block Diagram.
REGULATOR
5.8 V
DRAIN
(D)
5.8 V
4.8 V
BYPASS PIN
UNDER-VOLTAGE
+
-
CURRENT LIMIT
COMPARATOR
+
- VILIMIT
THERMAL
SHUTDOWN
SQ
RQ
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-4232-110205
Pin Functional Description
DRAIN (D) Pin:
Power MOSFET drain connection. Provides internal operating
current for both startup and steady-state operation.
BYPASS (BP) Pin:
Connection point for a 0.1 μF external bypass capacitor for the
internally generated 5.8 V supply. If an external bias winding is
used, the current into the BP pin must not exceed 1 mA.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is disabled when a
current greater than 49 μA is delivered into this pin.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS and FEEDBACK pins.
P Package (DIP-8B)
G Package (SMD-8B)
S1
S2
8S
7S
BP 3
FB 4
5D
3a
Figure 3. Pin Conguration.
D Package (SO-8C)
BP 1
FB 2
D4
8S
7S
6S
5S
3b
PI-3491-120706
222-2
Rev. E 11/08


Part Number LNK364
Description (LNK362 - LNK364) Low Power Off-Line Switcher IC
Maker Power Integrations
Total Page 16 Pages
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