POWERINT LNK364PN-TL

LNK362-364
LinkSwitch-XT Family
®
Energy Efficient, 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
efficiency
• 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
Features Superior to Linear/RCC
• Accurate hysteretic thermal shutdown protection –
automatic recovery improves field 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 Efficient
• Easily meets all global energy efficiency 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 efficiency 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
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
+
DC
Output
Wide Range
HV DC Input
+
LinkSwitch-XT
LNK362
D
FB
BP
S
a) Clampless flyback converter with LNK362
PI-4086-081005
+
DC
Output
Wide Range
HV DC Input
+
LinkSwitch-XT
LNK363-364
D
FB
BP
S
PI-4061-081005
b) Flyback converter with LNK363/4
Figure 1. Typical Application with LinkSwitch-XT.
OUTPUT POWER TABLE(4)
230 VAC ±15%
PRODUCT(3)
Adapter(1)
85-265 VAC
Open
Open
Adapter(1)
Frame(2)
Frame(2)
LNK362P or G
2.8 W
2.8 W
2.6 W
2.6 W
LNK363P or G
5W
7.5 W
3.7 W
4.7 W
LNK364P or G
5.5 W
9W
4W
6W
Table 1. Notes: 1. Minimum continuous power in a typical nonventilated 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.
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.
December 2005
LNK362-364
DRAIN
(D)
BYPASS
(BP)
REGULATOR
5.8 V
FAULT
PRESENT
AUTORESTART
COUNTER
CLOCK
RESET
+
5.8 V
4.8 V
BYPASS PIN
UNDER-VOLTAGE
-
CURRENT LIMIT
COMPARATOR
6.3 V
+
VI
-
LIMIT
JITTER
CLOCK
DCMAX
OSCILLATOR
FEEDBACK
(FB)
THERMAL
SHUTDOWN
VFB -VTH
S
Q
R
Q
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-4232-110205
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.
P Package (DIP-8B)
G Package (SMD-8B)
S
1
8
S
S
2
7
S
BP
3
FB
4
5
D
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.
2
C
12/05
PI-3491-111903
Figure 3. Pin Configuration.
LNK362-364
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 (DCMAX) and the clock signal that
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.
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 (ILIMIT), 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 (tLEB) after the power MOSFET
is turned on. This leading edge blanking time has been set so
that current spikes caused by capacitance and rectifier 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
PI-4047-110205
LinkSwitch-XT Functional
Description
V
DRAIN
400
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 sufficient
for both high frequency decoupling and energy storage.
300
200
100
0
136.5 kHz
127.5 kHz
0
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
10
5
Time (µs)
Figure 4. Frequency Jitter.
C
12/05
3
LNK362-364
CY1
100 pF
250 VAC
L1
1 mH
T1
EE16 9
4
5
J1
D2
1N4005
R1
3.9 k
1/8 W
C1
3.3 µF
400 V
85-265
VRMS
R2
390 Ω
1/8 W
D
LinkSwitch-XT
U1
LNK362P
D4
1N4005
U2
PC817A
FB
R3
1k
1/8 W
BP
S
L2
1 mH
J4
VR1
BZX79B5V1
5.1 V, 2%
C2
3.3 µF
400 V
J2
D3
1N4005
J3
8
NC NC
D1
1N4005
6.2 V,
322 mA
D5
1N4934
3
RF1
8.2 Ω
2.5 W
C4
330 µF
16 V
C3
100 nF
50 V
PI-4162-110205
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 efficiency standards, including the mandatory California
Energy Commission (CEC) requirement for average operating
efficiency.
The AC input is rectified by D1 to D4 and filtered by the bulk
storage capacitors C1 and C2. Resistor RF1 is a flameproof,
fusible, wire wound type and functions as a fuse, inrush current
limiter and, together with the π filter 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 flows through
CY1) often specified for adapters, in this case <10 µA.
4
C
12/05
The rectified and filtered 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 flyback transformer T1 is rectified by D5,
a low cost, fast recovery diode, and filtered 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 flow 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 efficiency 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.
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 rectifier diode.
3. Assumed efficiency 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 sufficient 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 flux density requirements described below, typically a
LinkSwitch-XT design will be discontinuous, which also has
the benefits 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
significant 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 rectifier
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 BVDSS specification of the internal MOSFET and ideally
≤ 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 reflected 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 flux 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 flux 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 film type.
C
12/05
5
LNK362-364
Input Filter
Capacitor
TOP VIEW
Y1Capacitor
FB
T
r
a
n
s
f
o
r
m
e
r
S
LinkSwitch-XT
D
S
BP
S
- HV DC +
INPUT
S
S
S
CBP
Optocoupler
+
DC
OUT
-
Maximize hatched copper
areas (
) for optimum
heatsinking
Output Filter
Capacitor
PI-4155-102705
Figure 6. Recommended Printed Circuit Layout for LinkSwitch-XT in a Flyback Converter Configuration.
LinkSwitch-XT Layout Considerations
See Figure 6 for a recommended circuit board layout for
LinkSwitch-XT.
Single Point Grounding
Use a single point ground connection from the input filter
capacitor to the area of copper connected to the SOURCE
pins.
Bypass Capacitor CBP
The BYPASS pin capacitor should be located as near as possible
to the BYPASS and SOURCE pins.
Primary Loop Area
The area of the primary loop that connects the input filter
capacitor, transformer primary and LinkSwitch-XT together
should be kept as small as possible.
Primary Clamp Circuit
A clamp is used to limit peak voltage on the DRAIN pin at turn
off. This can be achieved by using an RCD clamp or a Zener
6
C
12/05
(~200 V) and diode clamp across the primary winding. In all
cases, to minimize EMI, care should be taken to minimize the
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
cathode of the output diode.
Y Capacitor
The placement of the Y capacitor should be directly from
the primary input filter 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 filter is used, then the inductor in the
filter should be placed between the negative terminals of the
input filter capacitors.
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 filter
capacitor should be minimized. In addition, sufficient 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 verified on the bench to make sure that component
specifications 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 BVDSS specification
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 ILIMIT(MIN) at the
end of the tLEB(MIN). Under all conditions, the maximum drain
current should be below the specified absolute maximum
ratings.
3. Thermal Check – At specified maximum output power,
minimum input voltage and maximum ambient temperature,
verify that the temperature specifications 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 RDS(ON) of LinkSwitch-XT as
specified 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.
C
12/05
7
LNK362-364
ABSOLUTE MAXIMUM RATINGS(1,5)
DRAIN Voltage .................................. .............-0.3 V to 700 V
Peak DRAIN Current: LNK362................200 mA (375 mA)(2)
LNK363/364.........400 mA (750 mA)(2)
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
Operating Junction Temperature(3) ................-40 °C to 150 °C
Lead Temperature(4) ....................................................... 260 °C
Notes:
1. All voltages referenced to SOURCE, TA = 25 °C.
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 specified 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.
THERMAL IMPEDANCE
Thermal Impedance: P or G Package:
Notes:
(θJA) ........................... 70 °C/W(2); 60 °C/W(3) 1. Measured on pin 2 (SOURCE) close to plastic interface.
(θJC)(1) ............................................... 11 °C/W 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.
Conditions
Parameter
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 7
(Unless Otherwise Specified)
Min
Typ
Max
124
132
140
Units
CONTROL FUNCTIONS
Output Frequency
Maximum Duty
Cycle
FEEDBACK Pin
Turnoff Threshold
Current
FEEDBACK Pin
Voltage at Turnoff
Threshold
fOSC
BYPASS Pin
Voltage
BYPASS Pin
Voltage Hysteresis
8
C
12/05
Peak-Peak Jitter
9
DCMAX
S2 Open
60
IFB
TJ = 25 °C
30
49
68
LNK362
1.55
1.65
1.75
LNK363-364
1.53
1.63
1.73
VFB
TJ = 0 °C to
125 °C
kHz
%
µA
V
IS1
VFB 2 V
(MOSFET Not Switching)
See Note A
200
250
µA
IS2
FEEDBACK Open
(MOSFET
Switching)
250
300
µA
ICH1
VBP = 0 V, TJ = 25 °C
See Note C
-5.5
-3.5
-1.8
ICH2
VBP = 4 V, TJ = 25 °C
See Note C
-3.8
-2.3
-1.0
VBP
5.55
5.8
6.10
V
VBPH
0.8
1.0
1.2
V
DRAIN Supply
Current
BYPASS Pin
Charge Current
Average
TJ = 25 °C
mA
LNK362-364
Conditions
Parameter
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 7
(Unless Otherwise Specified)
Min
Typ
Max
Units
CONTROL FUNCTIONS (cont)
BYPASS Pin
Supply Current
IBPSC
See Note D
µA
68
CIRCUIT PROTECTION
Current Limit
Power Coefficient
ILIMIT
(See
Note E)
I2f
Leading Edge
Blanking Time
tLEB
Current Limit
Delay
tILD
Thermal
Shutdown
Temperature
TSD
Thermal
Shutdown
Hysteresis
TSHD
di/dt = 30 mA/µs
TJ = 25 °C
LNK362
130
140
150
di/dt = 42 mA/µs
TJ = 25 °C
LNK363
195
210
225
di/dt = 50 mA/µs
TJ = 25 °C
LNK364
233
250
268
di/dt = 30 mA/µs
TJ = 25 °C
LNK362
2199
2587
di/dt = 42 mA/µs
TJ = 25 °C
LNK363
4948
5821
di/dt = 50 mA/µs
TJ = 25 °C
LNK364
7425
8250
LNK362
300
375
LNK363/364
170
250
TJ = 25 °C
See Note F
TJ = 25 °C
See Note F
A2Hz
ns
125
135
See Note G
mA
142
ns
150
°C
75
°C
OUTPUT
LNK362
ID = 14 mA
ON-State
Resistance
RDS(ON)
LNK363
ID = 21 mA
LNK364
ID = 25 mA
OFF-State Drain
Leakage Current
IDSS
TJ = 25 °C
48
55
TJ = 100 °C
76
88
TJ = 25 °C
29
33
TJ = 100 °C
46
54
TJ = 25 °C
24
28
TJ = 100 °C
38
45
VBP = 6.2 V, VFB 2 V,
VDS = 560 V,
TJ = 125 °C
Ω
µA
50
C
12/05
9
LNK362-364
Conditions
Parameter
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 7
(Unless Otherwise Specified)
Min
Typ
Max
Units
OUTPUT (cont)
Breakdown
Voltage
VBP = 6.2 V, VFB 2 V,
See Note H, TJ = 25 °C
BVDSS
DRAIN Supply
Voltage
Output Enable
Delay
tEN
Output Disable
Setup Time
tDST
Auto-Restart
ON-Time
tAR
Auto-Restart Duty
Cycle
700
V
50
V
See Figure 9
10
0.5
TJ = 25 °C
See Note I
DCAR
LNK362
40
LNK363-364
45
5
µs
µs
ms
%
NOTES:
A. Total current consumption is the sum of IS1 and IDSS when FEEDBACK pin voltage is 2 V (MOSFET not
switching) and the sum of IS2 and IDSS when FEEDBACK pin is shorted to SOURCE (MOSFET switching).
B Since the output MOSFET is switching, it is difficult 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 BVDSS specification by ramping the DRAIN pin voltage up
to but not exceeding minimum BVDSS.
I. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to
frequency).
10
C
12/05
LNK362-364
470 Ω
5W
470 kΩ
D
S1
FB
S2
BP
50 V
S
S
S
S
50 V
0.1 µF
PI-3490-060204
Figure 7. LinkSwitch-XT General Test Circuit.
DCMAX
t2
(internal signal)
t1
tP
HV 90%
90%
FB
DRAIN
VOLTAGE
t
D= 1
t2
VDRAIN
tEN
10%
0V
tP =
1
fOSC
PI-3707-112503
PI-2048-033001
Figure 8. LinkSwitch-XT Duty Cycle Measurement.
Figure 9. LinkSwitch-XT Output Enable Timing.
C
12/05
11
LNK362-364
Typical Performance Characteristics
1.0
PI-2680-012301
1.2
Output Frequency
(Normalized to 25 °C)
PI-2213-012301
1.0
0.8
0.6
0.4
0.2
0
0.9
-50 -25
0
25
50
-50
75 100 125 150
-25
Junction Temperature (°C)
1.0
0.8
0.6
0.4
0.2
50
100
100 125
PI-4092-081505
1.2
1.0
0.8
Normalized
di/dt = 1
TBD
LNK362 30 mA/µs
LNK363 42 mA/µs
LNK364 50 mA/µs
0.6
0.4
Normalized
Current
Limit = 1
140 mA
210 mA
250 mA
0.2
150
Temperature (°C)
Figure 12. Current Limit vs. Temperature.
6
1
2
3
4
5
Normalized di/dt
Figure 13. Current Limit vs. di/dt.
PI-2240-012301
7
BYPASS Pin Voltage (V)
75
0
0
5
4
3
2
1
400
350
DRAIN Current (mA)
0
-50
50
1.4
Normalized Current Limit
PI-4091-081505
Current Limit
(Normalized to 25 °C)
1.2
25
Figure 11. Frequency vs. Temperature.
Figure 10. Breakdown vs. Temperature.
1.4
0
Junction Temperature (°C)
PI-4093-081605
Breakdown Voltage
(Normalized to 25 °C)
1.1
25 °C
300
100 °C
250
200
Scaling Factors:
LNK362
0.5
LNK363
0.8
LNK364
1.0
150
100
50
0
0
0
0.2
0.4
0.6
0.8
Time (ms)
Figure 14. BYPASS Pin Start-up Waveform.
12
C
12/05
1.0
0
2
4
6
8 10 12 14 16 18 20
DRAIN Voltage (V)
Figure 15. Output Characteristics.
LNK362-364
Typical Performance Characteristics (cont.)
PI-4094-081605
Drain Capacitance (pF)
1000
100
Scaling Factors:
LNK362
0.5
LNK363
0.8
LNK364
1.0
10
1
0
100
200
300
400
500
600
Drain Voltage (V)
Figure 16. COSS vs. Drain Voltage.
PART ORDERING INFORMATION
LinkSwitch Product Family
XT Series Number
Package Identifier
G
Plastic Surface Mount DIP
P
Plastic DIP
Lead Finish
N
Pure Matte Tin (Pb-Free)
Tape & Reel and Other Options
Blank Standard Configurations
LNK 364 G N - TL
TL
Tape & Reel, 1000 pcs minimum, G Package only
C
12/05
13
LNK362-364
DIP-8B
⊕ D S .004 (.10)
-E-
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-clockwise 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.
.137 (3.48)
MINIMUM
.240 (6.10)
.260 (6.60)
Pin 1
-D-
.367 (9.32)
.387 (9.83)
.125 (3.18)
.145 (3.68)
.057 (1.45)
.068 (1.73)
(NOTE 6)
.015 (.38)
MINIMUM
-TSEATING
PLANE
.100 (2.54) BSC
.008 (.20)
.015 (.38)
.120 (3.05)
.140 (3.56)
.300 (7.62) BSC
(NOTE 7)
.300 (7.62)
.390 (9.91)
.048 (1.22)
.053 (1.35)
.014 (.36)
.022 (.56) ⊕ T E D S .010 (.25) M
P08B
PI-2551-121504
SMD-8B
⊕ D S .004 (.10)
.137 (3.48)
MINIMUM
-E-
.372 (9.45)
.388 (9.86)
⊕ E S .010 (.25)
.240 (6.10)
.260 (6.60)
Pin 1
.100 (2.54) (BSC)
.367 (9.32)
.387 (9.83)
-D-
.057 (1.45)
.068 (1.73)
(NOTE 5)
.125 (3.18)
.145 (3.68)
.032 (.81)
.037 (.94)
.048 (1.22)
.053 (1.35)
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.046 .060 .060 .046
wise to Pin 8 when viewed
from the top. Pin 6 is omitted.
4. Minimum metal to metal
.080
spacing at the package body
Pin 1
for the omitted lead location
is .137 inch (3.48 mm).
.086
5. Lead width measured at
.186
package body.
.286
6. D and E are referenced
Solder Pad Dimensions
datums on the package
body.
.004 (.10)
.009 (.23)
.004 (.10)
.012 (.30)
.036 (0.91)
.044 (1.12)
0°- 8°
G08B
PI-2546-121504
14
C
12/05
LNK362-364
C
12/05
15
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 significant 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.
Power Integrations Worldwide Sales Support Locations
WORLD HEADQUARTERS
5245 Hellyer Avenue
San Jose, CA 95138, USA.
Main: +1-408-414-9200
Customer Service:
Phone: +1-408-414-9665
Fax: +1-408-414-9765
e-mail: [email protected]
GERMANY
Rueckertstrasse 3
D-80336, Munich
Germany
Phone: +49-89-5527-3910
Fax: +49-89-5527-3920
e-mail: [email protected]
JAPAN
Keihin Tatemono 1st Bldg 2-12-20
Shin-Yokohama, Kohoku-ku,
Yokohama-shi, Kanagawa ken,
Japan 222-0033
Phone: +81-45-471-1021
Fax: +81-45-471-3717
e-mail: [email protected]
TAIWAN
5F, No. 318, Nei Hu Rd., Sec. 1
Nei Hu Dist.
Taipei, Taiwan 114, R.O.C.
Phone: +886-2-2659-4570
Fax: +886-2-2659-4550
e-mail: [email protected]
CHINA (SHANGHAI)
Rm 807-808A
Pacheer Commercial Centre,
555 Nanjing Rd. West
Shanghai, P.R.C. 200041
Phone: +86-21-6215-5548
Fax: +86-21-6215-2468
e-mail: [email protected]
INDIA
261/A, Ground Floor
7th Main, 17th Cross,
Sadashivanagar
Bangalore, India 560080
Phone: +91-80-5113-8020
Fax: +91-80-5113-8023
e-mail: [email protected]
KOREA
RM 602, 6FL
Korea City Air Terminal B/D, 159-6
Samsung-Dong, Kangnam-Gu,
Seoul, 135-728, Korea
Phone: +82-2-2016-6610
Fax: +82-2-2016-6630
e-mail: [email protected]
EUROPE HQ
1st Floor, St. Jamesʼs House
East Street, Farnham
Surrey GU9 7TJ
United Kingdom
Phone: +44 (0) 1252-730-140
Fax: +44 (0) 1252-727-689
e-mail: [email protected]
CHINA (SHENZHEN)
Rm 2206-2207, Block A,
Electronics Science & Technology Bldg.
2070 Shennan Zhong Rd.
Shenzhen, Guangdong,
China, 518031
Phone: +86-755-8379-3243
Fax: +86-755-8379-5828
e-mail: [email protected]
ITALY
Via Vittorio Veneto 12
20091 Bresso MI
Italy
Phone: +39-028-928-6000
Fax: +39-028-928-6009
e-mail: [email protected]
SINGAPORE
51 Newton Road
#15-08/10 Goldhill Plaza
Singapore, 308900
Phone: +65-6358-2160
Fax: +65-6358-2015
e-mail: [email protected]
APPLICATIONS HOTLINE
World Wide +1-408-414-9660
16
C
12/05
APPLICATIONS FAX
World Wide +1-408-414-9760