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LNK353 Datasheet Preview

LNK353 Datasheet

(LNK353 / LNK354) Low Power Off-Line Switcher IC

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LNK353/354
LinkSwitch®-HF Family
Enhanced, Energy Efficient, Low Power
Off-Line Switcher IC
Product Highlights
Features Optimized for Lowest System Cost
• Fully integrated auto-restart for short-circuit and open
loop protection
• Self-biased supply – saves transformer auxiliary winding
and associated bias supply components
• Tight tolerances and negligible temperature variation on
key parameters eases design and lowers cost
• High maximum switching frequency allows very low
flux density transformer designs, practically eliminating
audible noise
• Frequency jittering greatly reduces EMI
• Packages with large creepage to high voltage pin
Lowest component count switcher solution
Much Better Performance over Linear/RCC
• Lower system cost than RCC, discrete PWM and other
integrated solutions
• Universal input range allows worldwide operation
• Simple ON/OFF control – no loop compensation needed
• No bias winding – simpler, lower cost transformer
• High frequency switching – smaller and lower cost
transformer
• Very low component count – higher reliability and single
side printed circuit board
• High bandwidth provides fast turn on with no overshoot
and excellent transient load response
• Current limit operation rejects line frequency ripple
• Built-in current limit and hysteretic thermal shutdown
protection
EcoSmart®– Extremely Energy Efficient
• No-load consumption <300 mW without bias winding at
265 VAC input
• Meets California Energy Commission (CEC), Energy
Star, and EU requirements
Applications
• Chargers for cell/cordless phones, PDAs, digital cameras,
MP3/portable audio devices, shavers etc.
• Standby and auxiliary supplies
Description
LinkSwitch-HF integrates a 700 V power MOSFET, oscillator,
simple ON/OFF control scheme, a high voltage switched current
+ DC +
Output
Wide Range
HV DC Input
D
LinkSwitch-HF
S
FB
BP
Figure 1. Typical Standby Application.
PI-3855-022704
OUTPUT POWER TABLE
PRODUCT(3)
230 VAC ±15%
Adapter(1)
Open
Frame(2)
85-265 VAC
Adapter(1)
Open
Frame(2)
LNK353 P or G 3 W
4W
2.5 W(4)
3W
LNK354 P or G 3.5 W
5W
3 W(4)
4.5 W
Table 1. Notes: 1. Typical continuous power in a non-ventilated
enclosed adapter measured at 50 °C ambient. 2. Maximum 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. For lead-free package options, see Part Ordering
Information. 4. For designs without a Y capacitor, the available power
may be lower (see Key Applications Considerations).
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.
The 200 kHz maximum switching frequency allows very
low flux transformer designs, practically eliminating audible
noise with the simple ON/OFF control scheme using standard
varnished transformer construction. Efficient operation at this
high switching frequency is achieved due to the optimized
switching characteristics and small capacitances of the integrated
power MOSFET. The fully integrated auto-restart circuit safely
limits output power during fault conditions such as output short
circuit or open loop, reducing component count and secondary
feedback circuitry cost. The internal oscillator frequency is
jittered to significantly reduce both the quasi-peak and average
EMI, minimizing filtering cost.
February 2005




Power Integrations

LNK353 Datasheet Preview

LNK353 Datasheet

(LNK353 / LNK354) Low Power Off-Line Switcher IC

No Preview Available !

www.DataSheet4U.com
LNK353/354
BYPASS
(BP)
FAULT
PRESENT
AUTO-
RESTART
COUNTER
CLOCK
RESET
6.3 V
FEEDBACK
(FB)
1.65 V -VT
JITTER
CLOCK
DCMAX
OSCILLATOR
Figure 2. Functional Block Diagram.
REGULATOR
5.8 V
DRAIN
(D)
5.8 V
4.85 V
BYPASS PIN
UNDER-VOLTAGE
+
-
CURRENT LIMIT
COMPARATOR
+
- VILIMIT
THERMAL
SHUTDOWN
SQ
RQ
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-2367-021105
Pin Functional Description
DRAIN (D) Pin:
Power MOSFET drain connection. Provides internal operating
current for both start-up 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.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is terminated 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
BP 3
FB 4
8S
7S
5D
Figure 3. Pin Configuration.
PI-3491-111903
2F
2/05


Part Number LNK353
Description (LNK353 / LNK354) Low Power Off-Line Switcher IC
Maker Power Integrations
Total Page 16 Pages
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