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LNK564 Datasheet Preview

LNK564 Datasheet

(LNK562 - LNK564) Energy Effi cient Off-Line Switcher IC

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LNK562-564
LinkSwitch®-LP
Energy Efcient 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 efciency
• 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 lter conguration
• 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 eld 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 Efciency Technology
• Easily meets all global energy efciency regulations with
no added components
• No-load consumption <150 mW at 265 VAC input
• ON/OFF control provides constant efciency 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 signicantly reduce both quasi-peak and
average EMI, minimizing lter 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 Simplied 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 3 W 3 W 3 W
Table 1. Output Power Table.
Notes:
1. Output power may be limited by specic 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: DIP-8B, G: SMD-8B, D: SO-8C. For lead-free
package options, see Part Ordering Information.
November 2008




Power Integrations

LNK564 Datasheet Preview

LNK564 Datasheet

(LNK562 - LNK564) Energy Effi cient Off-Line Switcher IC

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LNK562-564
BYPASS
(BP)
0.8 V
+
FEEDBACK
(FB)
OPEN LOOP
PULLDOWN
1.69 V -VTH
Figure 2. Functional Block Diagram.
REGULATOR
5.8 V
DRAIN
(D)
AUTO-RESTART
COUNTER
RESET
FAULT
PRESENT
6.3 V
JITTER
CLOCK
DCMAX
ADJ
OSCILLATOR
5.8 V
4.85 V
BYPASS PIN
UNDER-VOLTAGE
+
-
CURRENT LIMIT
COMPARATOR
+
- VILIMIT
THERMAL
SHUTDOWN
SQ
RQ
LEADING
EDGE
BLANKING
PI-3958-092905
SOURCE
(S)
Pin Functional Description
DRAIN (D) Pin:
The power MOSFET drain connection provides internal
operating current for both startup and steady-state operation.
BYPASS (BP) Pin:
A 0.1 μF external bypass capacitor for the internally generated
5.8 V supply is connected to this pin.
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 70 μA ows 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.
LinkSwitch-LP Functional
Description
LinkSwitch-LP comprises a 700 V power MOSFET switch with
a power supply controller on the same die. Unlike conventional
PWM (pulse width modulation) controllers, it uses a simple
ON/OFF control to regulate the output voltage. The controller
consists of an oscillator, feedback (sense and logic) circuit, 5.8
Vregulator, BYPASS pin undervoltage circuit, over-temperature
P Package (DIP-8B)
G Package (SMD-8B) D Package (SO-8C)
S1
S2
BP 3
FB 4
8S
7S
BP 1
FB 2
5D
D4
8S
7S
6S
5S
Figure 3. Pin Conguration.
PI-4547-011107
protection, frequency jittering, current limit circuit, and leading
edge blanking.
Oscillator
The typical oscillator frequency is internally set to an average
of 66/83/100 kHz for the LNK562, 563 & 564 respectively.
Two signals are generated from the oscillator: the maximum
duty cycle signal (DCMAX) and the clock signal that indicates
the beginning of each switching cycle.
2
Rev. H 11/08


Part Number LNK564
Description (LNK562 - LNK564) Energy Effi cient Off-Line Switcher IC
Maker Power Integrations
Total Page 16 Pages
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