Document
LNK562-564
LinkSwitch®-LP
Energy Efficient Off-Line Switcher IC for Linear Transformer Replacement
Product Highlights
Lowest System Cost and Advanced Safety Features • Lowest component count switcher • Very tight parameter tolerances using proprietary IC
trimming technology and transformer construction techniques enable Clampless™designs – decreases component count/system cost and increases efficiency • Meets industry standard requirements for thermal overload protection – eliminates the thermal fuse used with linear transformers or additional components in RCC designs • Frequency jittering greatly reduces EMI – enables low cost input filter configuration • Meets HV creepage requirements between DRAIN and all other pins, both on the PCB and at the package • Proprietary E-Shield™ transformer eliminates Y-capacitor
Superior Performance over Linear and RCC • Hysteretic thermal shutdown protection – automatic
recovery improves field reliability • 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 fast turn on with no overshoot
and excellent transient load response
EcoSmart®– Energy Efficiency Technology • Easily meets all global energy efficiency regulations with
no added components • No-load consumption <150 mW at 265 VAC input • ON/OFF control provides constant efficiency to very
light loads – ideal for mandatory CEC regulations
Applications • Chargers for cell/cordless phones, PDAs, power tools,
MP3/portable audio devices, shavers etc. • Standby and auxiliary supplies
Description
LinkSwitch-LP switcher ICs cost effectively replace all unregulated isolated linear transformer based (50/60 Hz) power supplies up to 3 W output power. For worldwide operation, a single universal input design replaces multiple linear transformer based designs. The self-biased circuit achieves an extremely low no-load consumption of under 150 mW. The internal oscillator frequency is jittered to significantly reduce both quasi-peak and average EMI, minimizing filter cost.
AC IN
+ DC Output
LinkSwitch-LP
D FB BP
S
(a)
PI-3923-092705
VO
Rated Output Power = VR • IR VR
IR
IO
(b) PI-3924-011706
Figure 1. Typical Application – not a Simplified Circuit (a) and Output Characteristic Envelope (b).
OUTPUT POWER TABLE1
PRODUCT4
230 VAC ±15%
85-265 VAC
Adapter2
Open Frame3
Adapter2
Open Frame3
LNK562P/G/D 1.9 W 1.9 W 1.9 W 1.9 W
LNK563P/G/D 2.5 W 2.5 W 2.5 W 2.5 W
LNK564P/G/D 3 W
3W
3W 3W
Table 1. Output Power Table.
Notes: 1. Output power may be limited by specific application parameters
including core size and Clampless operation (see Key Application Considerations). 2. Minimum continuous power in a typical non-ventilated enclosed adapter measured at 50 °C ambient. 3. Minimum practical continuous power in an open frame design with adequate heat sinking, measured at 50 °C ambient. 4. Packages: P:.