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PDF LNK500 Data sheet ( Hoja de datos )
| Número de pieza | LNK500 | |
| Descripción | CV or CV/CC Switcher | |
| Fabricantes | Power Integrations | |
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This product is not recommended for new designs.
LNK500
LinkSwitch Family
Energy Efficient, CV or CV/CC Switcher for
Very Low Cost Chargers and Adapters
Product Highlights
Cost Effective Linear/RCC Replacement
• Lowest cost and component count, constant voltage (CV) or
constant voltage/constant current (CV/CC) solution
• Extremely simple circuit configuration
• Up to 75% lighter power supply reduces shipping cost
• Primary based CV/CC solution eliminates 10 to 20
secondary components for low system cost
• Combined primary clamp, feedback, IC supply, and loop
compensation functions – minimizes external components
• Fully integrated auto-restart for short circuit and open loop
fault protection – saves external component costs
• 42 kHz operation simplifies EMI filter design
Much Higher Performance Over Linear/RCC
• Universal input range allows worldwide operation
• Up to 70% reduction in power dissipation – reduces enclosure
size significantly
• CV/CC output characteristic without secondary feedback
• System level thermal and current limit protection
• Meets all single point failure requirements with only one
additional clamp capacitor
• Controlled current in CC region provides inherent soft-start
• Optional opto feedback improves output voltage accuracy
EcoSmart™ – Extremely Energy Efficient
• Consumes <300 mW at 265 VAC input with no load
• Meets California Energy Commission (CEC), Energy Star, and
EU requirements
• No current sense resistors – maximizes efficiency
Applications
• Linear transformer replacement in all ≤3 W applications
• Chargers for cell phones, cordless phones, PDAs, digital
cameras, MP3/portable audio devices, shavers, etc.
• Home appliances, white goods and consumer electronics
• Constant output current LED lighting applications
• TV standby and other auxiliary supplies
Description
LinkSwitch™ is specifically designed to replace low power
linear transformer/RCC chargers and adapters at equal or
lower system cost with much higher performance and energy
efficiency. LNK500 is a lower cost version of the LNK501 with a
wider tolerance output CC characteristic. LinkSwitch introduces
a revolutionary patented topology for the design of low power
switching power supplies that rivals the simplicity and low
cost of linear adapters, and enables a much smaller, lighter,
and attractive package when compared with the traditional
“brick.” With efficiency of up to 75% and <300 mW no-load
LinkSwitch
DS
C
Wide Range
HV DC Input
DC
Output
(VO)
(a)
VO
Example Characteristic
Min Typ
VO
±10%
±5%
±25%*
For Circuit
Shown Above
IO
(b)
±25%*
IO
With Optional
Secondary Feedback**
*Estimated tolerance achievable in high volume production
including transformer and other component tolerances.
**See Optional Secondary Feedback section.
PI-3415-112202
Figure 1. Typical Application – Not a Simplified Circuit (a) and
Output Characteristic Tolerance Envelopes (b).
Product4
LNK500
P or G
Output Power Table1
230 VAC ±15%
Min2
Typ2
85-265 VAC
Min2 Typ2
No-Load
Input
Power
3.2 W
4.3 W
4 W 2.4 W 3 W <300 mW
5.5 W 2.9 W 3.5 W <500 mW3
Table 1. Notes: 1. Output power for designs in an enclosed
adapter measured at 50 °C ambient. 2. See Figure 1 (b) for
Min (CV only designs) and Typ (CV/CC charger designs) power
points identified on output characteristic. 3. Uses higher reflected
voltage transformer designs for increased power capability – see
Key Application Considerations section. 4. For lead-free package
options, see Part Ordering Information.
consumption, a LinkSwitch solution can save the end user
enough energy over a linear design to completely pay for
the full power supply cost in less than one year. LinkSwitch
integrates a 700 V power MOSFET, PWM control, high voltage
start-up, current limit, and thermal shutdown circuitry, onto a
monolithic IC.
September 2016
1 page  
a switching node, generating additional common mode EMI
currents through its internal parasitic capacitance.
The feedback configuration in Figure 6 is simply a resistive
divider made up of R1 and R3 with D1, R2, C1 and C2
rectifying, filtering and smoothing the primary winding voltage
signal. The optocoupler therefore effectively adjusts the resistor
divider ratio to control the DC voltage across R1 and therefore,
the feedback current received by the LinkSwitch CONTROL pin.
When the power supply operates in the constant current (CC)
region, for example when charging a battery, the output voltage
is below the voltage feedback threshold defined by U1 and
VR1 and the optocoupler is fully off. In this region, the circuit
behaves exactly as previously described with reference to
Figure 5 where the reflected voltage increases with increasing
output voltage and the LinkSwitch internal current limit is
adjusted to provide an approximate CC output characteristic.
Note that for similar output characteristics in the CC region, the
value of R1 in Figure 5 will be equal to the value of R1 + R3 in
Figure 6.
When the output reaches the voltage feedback threshold set
by U1 and VR1, the optocoupler turns on. Any further increase
in the power supply output voltage results in the U1 transistor
current increasing, which increases the percentage of the
reflected voltage appearing across R1. The resulting increase
in the LinkSwitch CONTROL current reduces the duty cycle
according to Figure 4 and therefore, maintains the output
voltage regulation.
Normally, R1 and R3 are chosen to be equal in value. However,
increasing R3 (while reducing R1 to keep R1 + R3 constant)
increases loop gain in the CV region, improving load regulation.
The extent to which R3 can be increased is limited by opto
LNK500
transistor voltage and dissipation ratings and should be fully
tested before finalizing a design. The values of C2 and C3 are
less important other than to make sure they are large enough
to have very little influence on the impedance of the voltage
division circuit set up by R1, R3 and U1 at the switching
frequency. Normally, the values of C2 and C3 in Figure 6 are
chosen equal to the value of C2 in Figure 5, though the voltage
rating may be reduced depending on the relative values of R1
and R2 discussed above. See Applications section for typical
values of components.
Figure 7 shows the influence of optocoupler feedback on the
output characteristic. The envelope defined by the dashed
lines represent the worst case power supply DC output voltage
and current tolerances (unit-to-unit and over the input voltage
range) if an optocoupler is not used. A typical example of an
inherent (without optocoupler) output characteristic is shown
dotted. This is the characteristic that would result if U1, R4 and
VR1 were removed. The optocoupler feedback results in the
characteristic shown by the solid line. The load variation arrow
in Figure 7 represents the locus of the output characteristic
normally seen during a battery charging cycle. The two
characteristics are identical as the output voltage rises but then
separate as shown when the voltage feedback threshold is
reached. This is the characteristic seen if the voltage feedback
threshold is above the output voltage at the inherent CC to CV
transition point also indicated in Figure 7.
Figure 8 shows a case where the voltage feedback threshold
is set below the voltage at the inherent CC to CV transition
point. In this case, as the output voltage rises, the secondary
feedback circuit takes control before the inherent CC to CV
transition occurs. In an actual battery charging application, this
simply limits the output voltage to a lower value.
Output Voltage
Voltage
feedback
threshold
Load variation
during battery
charging
Inherent
CC to CV
transition
point
VO(MAX)
Tolerance envelope
without optocoupler
Typical inherent
characteristic without
optocoupler
Characteristic with
optocoupler
Power Supply peak
output power curve
Characteristic observed with
load variation often applied during
laboratory bench testing
Output Current
Figure 8. Output Characteristic with Optocoupler Regulation (Reduced Voltage Feedback Threshold).
PI-2790-092101
www.power.com
5
Rev. E 09/16
5 Page 
LNK500
ABSOLUTE MAXIMUM RATINGS(1,4)
DRAIN Voltage .................................................... -0.3 V to 700 V
DRAIN Peak Current ...................................................... 400 mA
CONTROL Voltage ................................................ -0.3 V to 9 V
CONTROL Current (not to exceed 9 V) .......................... 100 mA
Storage Temperature ...................................... -65 °C to 150 °C
Operating Junction Temperature(2) ................... -40 °C to 150 °C
Lead Temperature(3) ..........................................................260 °C
Notes:
1.
2.
All voltages referenced to SOURCE,
Normally limited by internal circuitry.
TA
=
25
°C.
3. 1/16 in. from case for 5 seconds.
4. 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:
((qqJJAC))(1..)............................................................7..0...°.C.../.W...(.2.);..5. 511°C°C/W/W(3)
Notes:
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.
Parameter Symbol
CONTROL FUNCTIONS
Switching
Frequency
fOSC
Low Switching
Frequency
fOSC(LOW)
Duty Cycle at Low
Switching
Frequency
DCLF
Low Frequency
Duty Cycle Range
DC(RANGE)
Maximum Duty
Cycle
DCMAX
Conditions
SOURCE =Se0eVF; iTgJu=re-1420 to 125 °C
(Unless Otherwise Specified)
IC = IDCT, TJ = 25 °C
Duty Cycle = DCLF
TJ = 25 °C
Frequency
Switching from
TJ = 25 °C
fOSC
to
f ,OSC(LOW)
Frequency = f ,OSC(LOW) TJ = 25 °C
IC = 1.5 mA
PWM Gain
DCREG
IC = IDCT, TJ = 25 °C
CONTROL Pin
Current at 30%
Duty Cycle
CONTROL Pin
Voltage
Dynamic
Impedance
IDCT
VC(IDCT)
ZC
STeJe=F2ig5ur°eC4
IC = IDCT
IC = IDCT, TJ = 25 °C
Min
34.5
24
2.4
1.8
74
-0.45
2.21
5.5
60
Typ
42
30
3.8
3.15
77
-0.35
2.30
5.75
90
Max Units
49.5 kHz
36 kHz
5.2 %
4.5 %
80 %
-0.25
%/mA
2.39 mA
6V
120 W
www.power.com
11
Rev. E 09/16
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LNK500.PDF ] | |
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