POWER INTEGRATIONS LNK 364GN Datasheet

LNK362-364

®

LinkSwitch-XT Family

Energy Effi cient, Low Power
Off-Line Switcher IC

Product Highlights

Optimized for Lowest System Cost

• Proprietary IC trimming and transformer construction
techniques enable Clampless™ designs with LNK362
for lower system cost, component count and higher
effi ciency

• Fully integrated auto-restart for short circuit and

open loop protection

• Self-biased supply – saves transformer auxiliary winding
and associated bias supply components

• Frequency jittering greatly reduces EMI

• Meets HV creepage requirements between DRAIN and
all other pins both on the PCB and at the package

• Lowest component count switcher solution

+

Wide Range
HV DC Input

a) Clampless fl yback converter with LNK362

+

LinkSwitch-XT

LNK362

D

FB

BP

S

DC

Output

PI-4086-081005

DC

Output

+

+

Features Superior to Linear/RCC

• Accurate hysteretic thermal shutdown protection –

automatic recovery improves fi eld reliability

• Universal input range allows worldwide operation

• Simple ON/OFF control, no loop compensation needed

• Eliminates bias winding – simpler, lower cost

transformer

• Very low component count – higher reliability and single

side printed circuit board

• Auto-restart reduces delivered power by 95% during

short circuit and open loop fault conditions

• High bandwidth provides fast turn on with no overshoot

and excellent transient load response

EcoSmart

®

– Extremely Energy Effi cient

• Easily meets all global energy effi ciency regulations with
no added components

• No-load consumption <300 mW without bias winding at
265 VAC input (<50 mW with bias winding)

• ON/OFF control provides constant effi ciency to very
light loads – ideal for mandatory CEC regulations

Applications

• Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio players, and shavers

• Supplies for appliances, industrial systems, and metering

Wide Range

HV DC Input

b) Flyback converter with LNK363/4

Figure 1. Typical Application with LinkSwitch-XT.

OUTPUT POWER TABLE

LinkSwitch-XT

LNK363-364

D

FB

BP

S

PI-4061-081005

(4)

230 VAC ±15% 85-265 VAC

PRODUCT

LNK362P or G 2.8 W 2.8 W 2.6 W 2.6 W

LNK363P or G 5 W 7.5 W 3.7 W 4.7 W

LNK364P or G 5.5 W 9 W 4 W 6 W

Table 1. Notes: 1. Minimum continuous power in a typical non-
ventilated enclosed adapter measured at 50 °C ambient. 2. Minimum
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. Please see Part Ordering Information. 4. See Key
Application Considerations section for complete description of
assumptions.

(3)

Adapter

(1)

Open

Frame

(2)

Adapter

(1)

Open

Frame

(2)

Description

LinkSwitch-XT incorporates a 700 V power MOSFET, oscillator,
simple ON/OFF control scheme, a high voltage switched current
source, frequency jittering, cycle-by-cycle current limit and

December 2005

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.

LNK362-364

BYPASS

(BP)

FEEDBACK

(FB)

VFB -V

DRAIN

REGULATOR

5.8 V

FAULT

PRESENT

AUTO-

RESTART

COUNTER

CLOCK

RESET

6.3 V

JITTER

CLOCK

DC

MAX

OSCILLATOR

TH

5.8 V

4.8 V

SHUTDOWN

+

-

THERMAL

SRQ

BYPASS PIN
UNDER-VOLTAGE

Q

CURRENT LIMIT
COMPARATOR

+

-

LEADING

EDGE

BLANKING

V

I

LIMIT

(D)

Figure 2. Functional Block Diagram.

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. If an external bias winding is
used, the current into the BP pin must not exceed 1 mA.

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 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)

S

1

S

2

BP

3

FB

4

Figure 3. Pin Confi guration.

SOURCE

(S)

PI-4232-110205

S

8

7

S

5

D

PI-3491-111903

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2

LNK362-364

LinkSwitch-XT Functional
Description

LinkSwitch-XT combines a high voltage power MOSFET
switch with a power supply controller in one device. Unlike
conventional PWM (pulse width modulator) controllers, a
simple ON/OFF control regulates the output voltage. The
controller consists of an oscillator, feedback (sense and logic)
circuit, 5.8 V regulator, BYPASS pin under-voltage circuit,
over-temperature protection, frequency jittering, current limit
circuit, and leading edge blanking integrated with a 700 V
power MOSFET. The LinkSwitch-XT incorporates additional
circuitry for auto-restart.

Oscillator

The typical oscillator frequency is internally set to an average
of 132 kHz. Two signals are generated from the oscillator: the
maximum duty cycle signal (DC
indicates the beginning of each cycle.

The oscillator incorporates circuitry that introduces a small
amount of frequency jitter, typically 9 kHz peak-to-peak,
to minimize EMI emission. The modulation rate of the
frequency jitter is set to 1.5 kHz to optimize EMI reduction
for both average and quasi-peak emissions. The frequency
jitter should be measured with the oscilloscope triggered at
the falling edge of the DRAIN waveform. The waveform in
Figure 4 illustrates the frequency jitter.

Feedback Input Circuit

The feedback input circuit at the FB pin consists of a low
impedance source follower output set at 1.65 V for LNK362
and 1.63 V for LNK363/364. When the current delivered into
this pin exceeds 49 µA, a low logic level (disable) is generated
at the output of the feedback circuit. This output is sampled
at the beginning of each cycle on the rising edge of the clock
signal. If high, the power MOSFET is turned on for that cycle
(enabled), otherwise the power MOSFET remains off (disabled).
Since the sampling is done only at the beginning of each cycle,
subsequent changes in the FB pin voltage or current during the
remainder of the cycle are ignored.

5.8 V Regulator and 6.3 V Shunt Voltage Clamp

The 5.8 V regulator charges the bypass capacitor connected to the
BYPASS pin to 5.8 V by drawing a current from the voltage on
the DRAIN, whenever the MOSFET is off. The BYPASS pin is
the internal supply voltage node. When the MOSFET is on, the
LinkSwitch-XT runs off of the energy stored in the bypass capacitor.
Extremely low power consumption of the internal circuitry allows
the device to operate continuously from the current drawn from
the DRAIN pin. A bypass capacitor value of 0.1 µF is suffi cient
for both high frequency decoupling and energy storage.

In addition, there is a 6.3 V shunt regulator clamping the
BYPASS pin at 6.3 V when current is provided to the BYPASS

) and the clock signal that

MAX

pin through an external resistor. This facilitates powering of
the device externally through a bias winding to decrease the
no-load consumption to less than 50 mW.

BYPASS Pin Under-Voltage

The BYPASS pin under-voltage circuitry disables the power
MOSFET when the BYPASS pin voltage drops below 4.8 V.
Once the BYPASS pin voltage drops below 4.8 V, it must rise
back to 5.8 V to enable (turn-on) the power MOSFET.

Over-Temperature Protection

The thermal shutdown circuitry senses the die temperature.
The threshold is set at 142 °C typical with a 75 °C hysteresis.
When the die temperature rises above this threshold (142 °C) the
power MOSFET is disabled and remains disabled until the die
temperature falls by 75 °C, at which point it is re-enabled.

Current Limit

The current limit circuit senses the current in the power MOSFET.
When this current exceeds the internal threshold (I

LIMIT

), the
power MOSFET is turned off for the remainder of that cycle.
The leading edge blanking circuit inhibits the current limit
comparator for a short time (t

) after the power MOSFET

LEB

is turned on. This leading edge blanking time has been set so
that current spikes caused by capacitance and rectifi er reverse
recovery time will not cause premature termination of the
switching pulse.

Auto-Restart

In the event of a fault condition such as output overload, output
short circuit, or an open loop condition, LinkSwitch-XT enters
into auto-restart operation. An internal counter clocked by the
oscillator gets reset every time the FB pin is pulled high. If the
FB pin is not pulled high for approximately 40 ms, the power
MOSFET switching is disabled for 800 ms. The auto-restart
alternately enables and disables the switching of the power
MOSFET until the fault condition is removed.

600

500

400

300

200

100

0

05

Figure 4. Frequency Jitter.

V

DRAIN

136.5 kHz

127.5 kHz

Time (µs)

10

PI-4047-110205

12/05

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3

LNK362-364

RF1

8.2 Ω

2.5 W

J1

85-265

VRMS

J2

D1

1N4005D21N4005

C1

3.3 µF
400 V

D3

1N4005D41N4005

L1

1 mH

R1

3.9 k

1/8 W

L2

1 mH

C2

3.3 µF
400 V

LinkSwitch-XT

U1

LNK362P

CY1

100 pF

250 VAC

C4

D5

1N4934

330 µF

16 V

VR1

BZX79-

B5V1

5.1 V, 2%

PC817A

U2

R2
390 Ω
1/8 W

R3

1 k

1/8 W

PI-4162-110205

T1

NC NC

C3

100 nF

50 V

EE16

9

8

4
5

3

D

FB

BP

S

6.2 V,

322 mA

J3

J4

Figure 5. 2 W Universal Input CV Adapter Using LNK362.

Applications Example

A 2 W CV Adapter

The schematic shown in Figure 5 is a typical implementation of
a universal input, 6.2 V ±7%, 322 mA adapter using LNK362.
This circuit makes use of the Clampless technique to eliminate the
primary clamp components and reduce the cost and complexity
of the circuit.

The EcoSmart features built into the LinkSwitch-XT family
allow this design to easily meet all current and proposed
energy effi ciency standards, including the mandatory California
Energy Commission (CEC) requirement for average operating
effi ciency.

The AC input is rectifi ed by D1 to D4 and fi ltered by the bulk
storage capacitors C1 and C2. Resistor RF1 is a fl ameproof,
fusible, wire wound type and functions as a fuse, inrush current
limiter and, together with the π fi lter formed by C1, C2, L1
and L2, differential mode noise attenuator. Resistor R1 damps
ringing caused by L1 and L2.

This simple input stage, together with the frequency jittering of
LinkSwitch-XT, a low value Y1 capacitor and PIʼs E-Shield™
windings within T1, allow the design to meet both conducted
and radiated EMI limits with >10 dBµV margin. The low value
of CY1 is important to meet the requirement for a very low
touch current (the line frequency current that fl ows through
CY1) often specifi ed for adapters, in this case <10 µA.

The rectifi ed and fi ltered input voltage is applied to the primary
winding of T1. The other side of the primary is driven by the
integrated MOSFET in U1. No primary clamp is required as the
low value and tight tolerance of the LNK362 internal current
limit allows the transformer primary winding capacitance to
provide adequate clamping of the leakage inductance drain
voltage spike.

The secondary of the fl yback transformer T1 is rectifi ed by D5,
a low cost, fast recovery diode, and fi ltered by C4, a low ESR
capacitor. The combined voltage drop across VR1, R2 and the
LED of U2 determines the output voltage. When the output
voltage exceeds this level, current will fl ow through the LED
of U2. As the LED current increases, the current fed into the
FEEDBACK pin of U1 increases until the turnoff threshold
current (~49 µA) is reached, disabling further switching cycles
of U1. At full load, almost all switching cycles will be enabled,
and at very light loads, almost all the switching cycles will be
disabled, giving a low effective frequency and providing high
light load effi ciency and low no-load consumption.

Resistor R3 provides 1 mA through VR1 to bias the Zener
closer to its test current. Resistor R2 allows the output voltage
to be adjusted to compensate for designs where the value of the
Zener may not be ideal, as they are only available in discrete
voltage ratings. For higher output accuracy, the Zener may be
replaced with a reference IC such as the TL431.

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LNK362-364

The LinkSwitch-XT is completely self-powered from the DRAIN
pin, requiring only a small ceramic capacitor C3 connected to
the BYPASS pin. No auxiliary winding on the transformer is
required.

Key Application Considerations

LinkSwitch-XT Design Considerations

Output Power Table

The data sheet maximum output power table (Table 1) represents
the maximum practical continuous output power level that can
be obtained under the following assumed conditions:

1. The minimum DC input voltage is 90 V or higher for 85 VAC
input, or 240 V or higher for 230 VAC input or 115 VAC
with a voltage doubler. The value of the input capacitance
should be large enough to meet these criteria for AC input
designs.

2. Secondary output of 6 V with a fast PN rectifi er diode.

3. Assumed effi ciency of 70%.

4. Voltage only output (no secondary-side constant current
circuit).

5. Discontinuous mode operation (KP >1).

6. A primary clamp (RCD or Zener) is used.

7. The part is board mounted with SOURCE pins soldered
to a suffi cient area of copper to keep the SOURCE pin
temperature at or below 100 °C.

8. Ambient temperature of 50 °C for open frame designs
and an internal enclosure temperature of 60 °C for adapter
designs.

Below a value of 1, KP is the ratio of ripple to peak primary
current. Above a value of 1, KP is the ratio of primary MOSFET
OFF time to the secondary diode conduction time. Due to
the fl ux density requirements described below, typically a
LinkSwitch-XT design will be discontinuous, which also has
the benefi ts of allowing lower cost fast (instead of ultra-fast)
output diodes and reducing EMI.

Clampless Designs

Clampless designs rely solely on the drain node capacitance
to limit the leakage inductance induced peak drain-to-source
voltage. Therefore, the maximum AC input line voltage, the
value of VOR, the leakage inductance energy, a function of
leakage inductance and peak primary current, and the primary
winding capacitance determine the peak drain voltage. With no
signifi cant dissipative element present, as is the case with an
external clamp, the longer duration of the leakage inductance
ringing can increase EMI.

The following requirements are recommended for a universal
input or 230 VAC only Clampless design:

1. A Clampless design should only be used for PO ≤ 2.5 W,
using the LNK362† and a VOR** ≤ 90 V.

2. For designs where PO ≤ 2 W, a two-layer primary should be
used to ensure adequate primary intra-winding capacitance
in the range of 25 pF to 50 pF.

3. For designs where 2 < PO ≤ 2.5 W, a bias winding should be
added to the transformer using a standard recovery rectifi er
diode to act as a clamp. This bias winding may also be used
to externally power the device by connecting a resistor from
the bias-winding capacitor to the BYPASS pin. This inhibits
the internal high voltage current source, reducing device
dissipation and no-load consumption.

4. For designs where PO > 2.5 W Clampless designs are not
practical and an external RCD or Zener clamp should be
used.

5. Ensure that worst-case high line, peak drain voltage is below
the BV

specifi cation of the internal MOSFET and ideally

DSS

≤ 650 V to allow margin for design variation.

†For 110 VAC only input designs it may be possible to extend
the power range of Clampless designs to include the LNK363.
However, the increased leakage ringing may degrade EMI
performance.

**VOR is the secondary output plus output diode forward voltage
drop that is refl ected to the primary via the turns ratio of the
transformer during the diode conduction time. The VOR adds
to the DC bus voltage and the leakage spike to determine the
peak drain voltage.

Audible Noise

The cycle skipping mode of operation used in LinkSwitch-XT
can generate audio frequency components in the transformer.
To limit this audible noise generation, the transformer should
be designed such that the peak core fl ux density is below
1500 Gauss (150 mT). Following this guideline and using the
standard transformer production technique of dip varnishing
practically eliminates audible noise. Vacuum impregnation
of the transformer should not be used due to the high primary
capacitance and increased losses that result. Higher fl ux densities
are possible, however careful evaluation of the audible noise
performance should be made using production transformer
samples before approving the design.

Ceramic capacitors that use dielectrics, such as Z5U, when
used in clamp circuits may also generate audio noise. If this is
the case, try replacing them with a capacitor having a different
dielectric or construction, for example a fi lm type.

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5

LNK362-364

TOP VIEW

Y1-

Capacitor

Input Filter

Capacitor

DC

OUT

D

T

r
a
n
s

f
o

r

m

e

r

+

-

Output Filter

Capacitor

S

S

LinkSwitch-XT

Opto-

coupler

FB

S

BP

S

S

S

Maximize hatched copper
areas ( ) for optimum
heatsinking

­HV DC

INPUT

C

BP

+

PI-4155-102705

Figure 6. Recommended Printed Circuit Layout for LinkSwitch-XT in a Flyback Converter Confi guration.

LinkSwitch-XT Layout Considerations

(~200 V) and diode clamp across the primary winding. In all

cases, to minimize EMI, care should be taken to minimize the
See Figure 6 for a recommended circuit board layout for
LinkSwitch-XT.

Single Point Grounding

Use a single point ground connection from the input fi lter
capacitor to the area of copper connected to the SOURCE
pins.

circuit path from the clamp components to the transformer and

LinkSwitch-XT.

Thermal Considerations

The copper area underneath the LinkSwitch-XT acts not only

as a single point ground, but also as a heatsink. As this area is

connected to the quiet source node, it should be maximized for

good heat sinking of LinkSwitch-XT. The same applies to the

Bypass Capacitor C

BP

cathode of the output diode.
The BYPASS pin capacitor should be located as near as possible
to the BYPASS and SOURCE pins.

Y Capacitor

The placement of the Y capacitor should be directly from

Primary Loop Area

The area of the primary loop that connects the input fi lter
capacitor, transformer primary and LinkSwitch-XT together
should be kept as small as possible.

the primary input fi lter capacitor positive terminal to the

common/return terminal of the transformer secondary. Such

a placement will route high magnitude common-mode surge

currents away from the LinkSwitch-XT device. Note that if an

input pi (C, L, C) EMI fi lter is used, then the inductor in the

Primary Clamp Circuit

A clamp is used to limit peak voltage on the DRAIN pin at turn

fi lter should be placed between the negative terminals of the

input fi lter capacitors.
off. This can be achieved by using an RCD clamp or a Zener

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LNK362-364

Optocoupler

Place the optocoupler physically close to the LinkSwitch-XT to
minimize the primary-side trace lengths. Keep the high current,
high voltage drain and clamp traces away from the optocoupler
to prevent noise pick up.

Output Diode

For best performance, the area of the loop connecting the
secondary winding, the output diode and the output fi lter
capacitor should be minimized. In addition, suffi cient copper
area should be provided at the anode and cathode terminals
of the diode for heat sinking. A larger area is preferred at the
quiet cathode terminal. A large anode area can increase high
frequency radiated EMI.

Quick Design Checklist

As with any power supply design, all LinkSwitch-XT designs
should be verifi ed on the bench to make sure that component
specifi cations are not exceeded under worst-case conditions. The
following minimum set of tests is strongly recommended:

1. Maximum drain voltage – Verify that VDS does not exceed

650 V at the highest input voltage and peak (overload) output
power. The 50 V margin to the 700 V BV

specifi cation

DSS

gives margin for design variation, especially in Clampless
designs.

2. Maximum drain current – At maximum ambient temperature,
maximum input voltage and peak output (overload) power,
verify drain current waveforms for any signs of transformer
saturation and excessive leading-edge current spikes at
startup. Repeat under steady state conditions and verify that
the leading-edge current spike event is below I
end of the t

. Under all conditions, the maximum drain

LEB(MIN)

LIMIT(MIN)

at the

current should be below the specifi ed absolute maximum
ratings.

3. Thermal Check – At specifi ed maximum output power,
minimum input voltage and maximum ambient temperature,
verify that the temperature specifi cations are not exceeded
for LinkSwitch-XT, transformer, output diode and output
capacitors. Enough thermal margin should be allowed for
part-to-part variation of the R

of LinkSwitch-XT as

DS(ON)

specifi ed in the data sheet. Under low line, maximum power,
a maximum LinkSwitch-XT SOURCE pin temperature of
105 °C is recommended to allow for these variations.

Design Tools

Up-to-date information on design tools can be found at the
Power Integrations web site: www.powerint.com.

12/05

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7

LNK362-364

ABSOLUTE MAXIMUM RATINGS

DRAIN Voltage .................................. .............-0.3 V to 700 V

Peak DRAIN Current: LNK362................200 mA (375 mA)

LNK363/364.........400 mA (750 mA)

FEEDBACK Voltage ........................................... -0.3 V to 9 V

FEEDBACK Current ...................................................100 mA

BYPASS Voltage.................................................. -0.3 V to 9 V

Storage Temperature .....................................-65 °C to 150 °C

(3)

Operating Junction Temperature
Lead Temperature

(4)

....................................................... 260 °C

................-40 °C to 150 °C

THERMAL IMPEDANCE

Thermal Impedance: P or G Package:

(θJA) ........................... 70 °C/W

(1)

(θJC)

............................................... 11 °C/W

(2)

; 60 °C/W

Conditions

Parameter Symbol

SOURCE = 0 V; TJ = -40 to 125 °C

See Figure 7

(Unless Otherwise Specifi ed)

CONTROL FUNCTIONS

Output Frequency

f

OSC

TJ = 25 °C

Peak-Peak Jitter 9

(1,5)

Notes:

(2)

1. All voltages referenced to SOURCE, TA = 25 °C.

(2)

2. The higher peak DRAIN current is allowed while the
DRAIN voltage is simultaneously less than 400 V.

3. Normally limited by internal circuitry.

4. 1/16 in. from case for 5 seconds.

5. Maximum ratings specifi ed may be applied, one at a time,
without causing permanent damage to the product.
Exposure to Absolute Maximum Rating conditions for
extended periods of time may affect product reliability.

Notes:

(3)

1. Measured on pin 2 (SOURCE) close to plastic interface.

2. Soldered to 0.36 sq. in. (232 mm2), 2 oz. (610 g/m2) copper clad.

3. Soldered to 1 sq. in. (645 mm2), 2 oz. (610 g/m2) copper clad.

Min Typ Max Units

Average 124 132 140

kHz

Maximum Duty
Cycle

FEEDBACK Pin
Turnoff Threshold
Current

FEEDBACK Pin
Voltage at Turnoff
Threshold

DRAIN Supply
Current

BYPASS Pin
Charge Current

BYPASS Pin
Voltage

DC

V

I

I

V

I

FB

I

S1

I

S2

CH1

CH2

MAX

FB

BP

S2 Open 60 %

TJ = 25 °C 30 49 68 µA

TJ = 0 °C to

125 °C

LNK363-364 1.53 1.63 1.73

VFB 2 V

(MOSFET Not Switching)

See Note A

FEEDBACK Open

(MOSFET
Switching)

VBP = 0 V, TJ = 25 °C

See Note C

VBP = 4 V, TJ = 25 °C

See Note C

LNK362 1.55 1.65 1.75

200 250 µA

250 300 µA

-5.5 -3.5 -1.8

-3.8 -2.3 -1.0

5.55 5.8 6.10 V

V

mA

BYPASS Pin
Voltage Hysteresis

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V

BPH

0.8 1.0 1.2 V

Parameter Symbol

SOURCE = 0 V; TJ = -40 to 125 °C

CONTROL FUNCTIONS (cont)

Conditions

See Figure 7

(Unless Otherwise Specifi ed)

LNK362-364

Min Typ Max Units

BYPASS Pin
Supply Current

I

BPSC

CIRCUIT PROTECTION

I

LIMIT

Current Limit

Power Coeffi cient

Leading Edge
Blanking Time

Current Limit
Delay

(See

Note E)

I2f

t

LEB

t

ILD

di/dt = 30 mA/µs

TJ = 25 °C

di/dt = 42 mA/µs

TJ = 25 °C

di/dt = 50 mA/µs

TJ = 25 °C

di/dt = 30 mA/µs

TJ = 25 °C

di/dt = 42 mA/µs

TJ = 25 °C

di/dt = 50 mA/µs

TJ = 25 °C

TJ = 25 °C

See Note F

See Note D 68 µA

LNK362 130 140 150

mA

A2Hz

ns

TJ = 25 °C

See Note F

LNK363 195 210 225

LNK364 233 250 268

LNK362 2199 2587

LNK363 4948 5821

LNK364 7425 8250

LNK362 300 375

LNK363/364 170 250

125 ns

Thermal
Shutdown
Temperature

Thermal
Shutdown
Hysteresis

OUTPUT

ON-State
Resistance

OFF-State Drain
Leakage Current

T

R

T

SD

SHD

DS(ON)

I

DSS

See Note G 75 °C

LNK362

ID = 14 mA

LNK363

ID = 21 mA

LNK364

ID = 25 mA

VBP = 6.2 V, VFB 2 V,

VDS = 560 V,

TJ = 125 °C

135 142 150 °C

TJ = 25 °C4855

TJ = 100 °C7688

TJ = 25 °C2933

TJ = 100 °C4654

TJ = 25 °C2428

TJ = 100 °C3845

50 µA

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Ω

C

9

LNK362-364

Parameter Symbol

OUTPUT (cont)

Conditions

SOURCE = 0 V; TJ = -40 to 125 °C

See Figure 7

(Unless Otherwise Specifi ed)

Min Typ Max Units

Breakdown
Voltage

DRAIN Supply
Voltage

Output Enable
Delay

Output Disable
Setup Time

Auto-Restart
ON-Time

Auto-Restart Duty
Cycle

BV

DC

t

t

t

DSS

EN

DST

AR

AR

VBP = 6.2 V, VFB 2 V,

See Note H, TJ = 25 °C

See Figure 9 10 µs

TJ = 25 °C
See Note I

700 V

50 V

0.5 µs

LNK362 40

ms

LNK363-364 45

5%

NOTES:
A. Total current consumption is the sum of IS1 and I

switching) and the sum of IS2 and I

when FEEDBACK pin is shorted to SOURCE (MOSFET switching).

DSS

when FEEDBACK pin voltage is 2 V (MOSFET not

DSS

B Since the output MOSFET is switching, it is diffi cult to isolate the switching current from the supply current at the

DRAIN. An alternative is to measure the BYPASS pin current at 6 V.

C. See Typical Performance Characteristics section Figure 14 for BYPASS pin start-up charging waveform.

D. This current is only intended to supply an optional optocoupler connected between the BYPASS and FEEDBACK

pins and not any other external circuitry.

E. For current limit at other di/dt values, refer to Figure 13.

F. This parameter is guaranteed by design.

G. This parameter is derived from characterization.

H. Breakdown voltage may be checked against minimum BV

to but not exceeding minimum BV

DSS

.

specifi cation by ramping the DRAIN pin voltage up

DSS

I. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to

frequency).

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10

LNK362-364

S1

Figure 7. LinkSwitch-XT General Test Circuit.

t

2

t

1

HV

90%

DRAIN

VOLTAGE

10%

0 V

D =

470 Ω

5 W

90%

t

1

t

2

PI-2048-033001

FB

D

BP

S

S

SS

DC

MAX

470 kΩ

0.1 µF

S2

50 V50 V

PI-3490-060204

(internal signal)

t

P

FB

t

V

DRAIN

tP =

f

OSC

1

EN

PI-3707-112503

Figure 8. LinkSwitch-XT Duty Cycle Measurement.

Figure 9. LinkSwitch-XT Output Enable Timing.

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11

LNK362-364

Typical Performance Characteristics

1.1

1.0

Breakdown Voltage

(Normalized to 25 °C)

0.9

-50 -25 0 25 50 75 100 125 150

Junction Temperature (°C)

Figure 10. Breakdown vs. Temperature.

1.4

1.2

1.0

0.8

0.6

Current Limit

0.4

(Normalized to 25 °C)

0.2

PI-2213-012301

PI-4091-081505

1.2

1.0

0.8

0.6

0.4

Output Frequency

(Normalized to 25 °C)

0.2

0

-50 -25 0 25 50 75 100 125

Junction Temperature (°C)

Figure 11. Frequency vs. Temperature.

1.4

1.2

1.0

0.8

0.6

0.4

Normalized Current Limit

0.2

LNK362
LNK363
LNK364

Normalized
di/dt = 1

TBD

30 mA/µs
42 mA/µs
50 mA/µs

Normalized
Current
Limit = 1

140 mA
210 mA
250 mA

PI-2680-012301

PI-4092-081505

0

-50 0 50 100 150

Temperature (°C)

Figure 12. Current Limit vs. Temperature.

7

6

5

4

3

2

1

BYPASS Pin Voltage (V)

0

0.2 0.4 0.6 0.8

0

Time (ms)

Figure 14. BYPASS Pin Start-up Waveform.

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1.0

PI-2240-012301

0

12345

Normalized di/dt

Figure 13. Current Limit vs. di/dt.

400

350

300

25 °C

100 °C

250

200

150

100

DRAIN Current (mA)

Scaling Factors:
LNK362 0.5

LNK363 0.8
LNK364 1.0

50

0

04286 101214161820

DRAIN Voltage (V)

Figure 15. Output Characteristics.

PI-4093-081605

Typical Performance Characteristics (cont.)

1000

100

Scaling Factors:
LNK362 0.5

LNK363 0.8
LNK364 1.0

10

Drain Capacitance (pF)

1

0 100 200 300 400 500 600

Drain Voltage (V)

LNK362-364

PI-4094-081605

Figure 16. C

PART ORDERING INFORMATION

LNK 364 G N - TL

vs. Drain Voltage.

OSS

LinkSwitch Product Family

XT Series Number

Package Identifi er

G Plastic Surface Mount DIP

P Plastic DIP

Lead Finish

N Pure Matte Tin (Pb-Free)

Tape & Reel and Other Options

Blank Standard Confi gurations

TL Tape & Reel, 1000 pcs minimum, G Package only

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LNK362-364

-E-

.240 (6.10)
.260 (6.60)

Pin 1

-D-

.125 (3.18)
.145 (3.68)

-T­SEATING
PLANE

.100 (2.54) BSC

D S

⊕

.367 (9.32)
.387 (9.83)

.014 (.36)
.022 (.56)

.004 (.10)

T E D S

⊕

.137 (3.48)
MINIMUM

.048 (1.22)
.053 (1.35)

.010 (.25) M

.057 (1.45)
.068 (1.73)

(NOTE 6)

.015 (.38)
MINIMUM

.120 (3.05)
.140 (3.56)

DIP-8B

Notes:

1. Package dimensions conform to JEDEC specification
MS-001-AB (Issue B 7/85) for standard dual-in-line (DIP)
package with .300 inch row spacing.

2. Controlling dimensions are inches. Millimeter sizes are
shown in parentheses.

3. Dimensions shown do not include mold flash or other
protrusions. Mold flash or protrusions shall not exceed
.006 (.15) on any side.

4. Pin locations start with Pin 1, and continue counter-clock­ wise to Pin 8 when viewed from the top. The notch and/or
dimple are aids in locating Pin 1. Pin 6 is omitted.

5. Minimum metal to metal spacing at the package body for
the omitted lead location is .137 inch (3.48 mm).

6. Lead width measured at package body.

7. Lead spacing measured with the leads constrained to be
perpendicular to plane T.

.008 (.20)
.015 (.38)

.300 (7.62) BSC

(NOTE 7)

.300 (7.62)
.390 (9.91)

P08B

PI-2551-121504

-E-

.240 (6.10)
.260 (6.60)

Pin 1

-D-

.125 (3.18)
.145 (3.68)

.032 (.81)
.037 (.94)

D S

.004 (.10)

⊕

.100 (2.54) (BSC)

.367 (9.32)
.387 (9.83)

.048 (1.22)
.053 (1.35)

.137 (3.48)
MINIMUM

.372 (9.45)
.388 (9.86)

E S

⊕

.057 (1.45)
.068 (1.73)

(NOTE 5)

.009 (.23)

.010 (.25)

SMD-8B

Pin 1

.004 (.10)
.012 (.30)

.046

.086

.060

.186

.060

.286

Solder Pad Dimensions

.004 (.10)

.036 (0.91)
.044 (1.12)

.046

.080

Notes:

1. Controlling dimensions are
inches. Millimeter sizes are
shown in parentheses.

2. Dimensions shown do not
include mold flash or other
protrusions. Mold flash or
protrusions shall not exceed
.006 (.15) on any side.

.420

3. Pin locations start with Pin 1,
and continue counter-clock­ wise to Pin 8 when viewed
from the top. Pin 6 is omitted.

4. Minimum metal to metal
spacing at the package body
for the omitted lead location
is .137 inch (3.48 mm).

5. Lead width measured at
package body.

6. D and E are referenced
datums on the package
body.

°

°

8

0 -

PI-2546-121504

G08B

14

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LNK362-364

12/05

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LNK362-364

Revision Notes Date

B 1) Released Final Data Sheet. 11/05

C 1) Corrected Application Example section. 12/05

For the latest updates, visit our website: www.powerint.com

Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume
any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY
DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.

PATENT INFORMATION

The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered by one or more U.S.
and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrationsʼ patents
may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at http://www.powerint.com/ip.htm.

LIFE SUPPORT POLICY

POWER INTEGRATIONSʼ PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF POWER INTEGRATIONS. As used herein:

1. A Life support device or system is one which, (i) is intended for surgical implant into the body, or (ii) supports or sustains life, and (iii) whose failure to perform,
when properly used in accordance with instructions for use, can be reasonably expected to result in signifi cant injury or death to the user.

2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or effectiveness.

The PI logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, EcoSmart, Clampless, E-Shield, Filterfuse,
PI Expert and PI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective companies.
©Copyright 2005, Power Integrations, Inc.

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16

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