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Power Integrations

LNK574 Datasheet Preview

LNK574 Datasheet

Zero No-Load or Zero Standby Consumption

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LNK574/576
LinkZero-LP
Zero No-Load or Zero Standby Consumption
with up to 1 mW Output Load
Product Highlights
Lowest System Cost with Zero Standby
(1 mW Output Power)
Automatically enters low consumption power-down mode when load
drops below ~0.2% of full load for LNK576 and ~0.6% for LNK574
Detects load reconnection and automatically restarts regulation
Simple upgrade to existing LinkSwitch-LP designs
Very accurate IC parameter tolerances improve system manu-
facturing yield
Suitable for low-cost clampless designs
Frequency jittering greatly reduces EMI filter cost
Extended package creepage improves system field reliability
Advanced Protection/Safety Features
Accurate hysteretic thermal shutdown protection – automatic
recovery reduces field returns
Universal input range allows worldwide operation
Auto-restart reduces delivered power by >85% during short-circuit
and open-loop fault conditions
Simple ON/OFF control, no loop compensation needed
High bandwidth provides excellent transient load response with no
overshoot
EcoSmart– Energy Efficient
No-load or standby (1 mW output power) consumption as low as
<5 mW at 230 VAC input (Note 1)
Easily meets all global energy efficiency regulations with no added
components
ON/OFF control provides constant efficiency to very light loads
Applications
Chargers for cell/cordless phones, PDAs, power tools, MP3/portable
audio devices, shavers, etc.
Standby power supply for TV, video displays, and appliances
Description
The LinkZero™-LP controller incorporates new technology which
enables the device to automatically enter into and wake up from
no-load mode or with 1 mW load while taking less than 5 mW from the
AC power. IEC 62301 specifies measurements of standby power to a
minimum accuracy of 10 mW, and so LinkZero-LP’s consumption of
substantially less than 5 mW at 230 VAC rounds to zero based on the
IEC definition. This low power level is also immeasurable on most
power meters. The accurately specified FEEDBACK (FB) pin voltage
reference enables universal input primary-side regulated power
supplies with accurate constant voltage from 5% to full load. The
start-up and operating power are derived directly from the DRAIN pin
which eliminates start-up circuitry. The internal oscillator frequency is
jittered to significantly reduce both quasi-peak and average EMI,
minimizing filter cost.
+
LNK574DG
(a) Typical Application Schematic for LNK574DG.
+ aPtIN3<250.V0D0CWin
Power-Down
Mode
DC+
Output
D
LNK576DG
S
FB
BP/M
OP1
OP1
Shunt
Regulator
PI-7230-052214
(b) Typical Application Schematic for LNK576DG.
Figure 1. Typical Applications – Zero No-Load Charger (a) and Zero Standby
Power Supply (b).
Output Power Table1
Product4
LNK574DG
LNK576DG
230 VAC ±15%
Adapter2
Open
Frame3
3W 3W
6W 9W
85-265 VAC
Adapter2
Open
Frame3
3W 3W
5W 8W
Table 1. Output Power Table.
Notes:
1. IEC 62301 Clause 4.5 rounds standby power use below 5 mW to zero.
2. Typical continuous power in a non-ventilated enclosed adapter measured at
+50 °C ambient.
3. Maximum practical continuous power in an open frame design with adequate
heat sinking, measured at 50 °C ambient.
4. Packages: D: SO-8C.
www.power.com
This Product is Covered by Patents and/or Pending Patent Applications.
November 2015




Power Integrations

LNK574 Datasheet Preview

LNK574 Datasheet

Zero No-Load or Zero Standby Consumption

No Preview Available !

LNK574/576
BYPASS/
MULTI FUNCTION
(BP/M)
OPEN LOOP
PULL UP
FEEDBACK
(FB)
GENERATOR
FEEDBACK REF
1.70 V - 1.37 V
OVERVOLTAGE
PU
+ PROTECTION
+
+
3 V 6.5 V
5.85 V
+ 4.85 V
+
0.9 V
AUTO-RESTART
COUNTER
FAULT
RESET JITTER
REGULATOR
5.85 V
BYPASS PIN
UNDERVOLTAGE
DRAIN
(D)
CURRENT LIMIT
+
-
VI
LIMIT
CC CUT BACK
1.70 V - 0.9 V
CLOCK
ADJDCMAX
OSCILLATOR
POWER-
DOWN
COUNTER
160 or 416
CYfCOSLCES
EVENT
COUNTER
RESET
PU
SYSTEM
POWER
DOWN/
RESTART
SQ
RQ
LEADING
EDGE
BLANKING
Figure 2 Functional Block Diagram.
Pin Functional Description
DRAIN (D) Pin:
The power MOSFET drain connection provides internal operating
current for both startup and steady-state operation.
BYPASS/MULTI-FUNCTIONAL PROGRAMMABLE (BP/M) Pin:
An external bypass capacitor for the internally generated 5.85 V
supply is connected to this pin. The value of capacitor establishes
the power-down period. The minimum value of capacitor is 0.1 mF.
An overvoltage protection disables the switching if the current into
the pin exceeds 6.5 mA (ISD).
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is disabled when a voltage
greater than an internal VFB reference voltage is applied to the
FEEDBACK pin.
The VFB reference voltage is internally adjusted from 1.70 V at full
load to 1.37 V at no-load in CV mode, and 1.70 V to 0.9 V in CC
mode. Below 0.9 V the part enters auto-restart operation.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS and FEEDBACK pins.
D Package (SO-8C)
BP/M 1
FB 2
D4
8S
7S
6S
5S
Figure 3. Pin Configuration.
SOURCE
(S)
PI-5509-032714
PI-5507-060210
2
Rev. D 11/15
www.power.com


Part Number LNK574
Description Zero No-Load or Zero Standby Consumption
Maker Power Integrations
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