LNK574 Datasheet, PDF (1/16 Pages) Power Integrations, Inc. – Zero No-Load Consumption Integrated Off-Line Switcher

LNK574
LinkZero^™-LP
Zero No-Load Consumption Integrated Off-Line Switcher
Product Highlights
Lowest System Cost with Zero No-Load
• Automatically enters zero input power mode when load is
disconnected
• Detects load reconnection and automatically restarts regulation
• Simple upgrade to existing LinkSwitch-LP designs
• Very tight IC parameter tolerances improve system manufactur-
ing 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
AC
IN
+ _DC
Output
LinkZero-LP
D
FB
BP/M
S
PI-5508-072610
(a) Typical Application Schematic
V_O
Rated Output Power = V_R × I_R
V_R
EcoSmart^™ – Energy Efficient
• No-load consumption as low as 4 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.
Description
LinkZero-LP is an upgrade to the popular LinkSwitch-LP, the
industry’s lowest component count charger/adapter and standby
power switcher IC. The LinkZero-LP controller incorporates new
technology which enables the device to automatically enter into
and wake up from no-load mode 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 tightly 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.
I_R
I_O
PI-5510-082310
(b) Output Characteristic
Figure 1. Typical Application – Not a Simplified Circuit (a) and Output
Characteristic Envelope (b).
Output Power Table
Product⁴
LNK574DG
230 VAC ±15%
Adapter²
Open
Frame³
3W
3W
85-265 VAC
Adapter²
Open
Frame³
3W
3W
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
heatsinking, measured at 50 °C ambient.
4. Packages: D: SO-8C.
www.powerint.com
December 2010