Details, datasheet, quote on part number: LNK501P
DescriptionEnergy Efficient, Cv/cc Switcher For Very Low Cost Chargers And Adapters
CompanyPower Integrations, Inc.
DatasheetDownload LNK501P datasheet
Find where to buy


Features, Applications

Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters

Cost Effective Linear/RCC Replacement Lowest cost and component count, constant voltage, constant current (CV/CC) solution Extremely simple circuit configuration to 75% lighter power supply reduces shipping cost Primary based CV/CC solution eliminates to 20 secondary components for low system cost Combined primary clamp, feedback, IC supply, and loop compensation functions­minimizes external components Fully integrated auto-restart for short circuit and open loop fault protection­saves external component costs 42 kHz operation simplifies EMI filter design 3 W output with EE13 core for low cost and small size Much Higher Performance Over Linear/RCC Universal input range allows worldwide operation to 70% reduction in power dissipation­reduces 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

*Estimated tolerance achievable in high volume production including transformer and other component tolerances. **See Optional Secondary Feedback section.

Figure 1. Typical Application ­ not a Simplified Circuit (a) and Output Characteristic Tolerance Envelopes (b).

EcoSmart - Extremely Energy Efficient Consumes at 265 VAC input with no load Meets Blue Angel, Energy Star, and EC requirements No current sense resistors­maximizes 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 TV standby and other auxiliary supplies

Table 1. Notes: 1. Typical output power for designs in an enclosed adapter measured 50 °C ambient. 2. Uses higher reflected voltage transformer designs for increased power capability ­ See Key Application Considerations section. 3. See Part Ordering Information.


LinkSwitch is specifically designed to replace all linear transformer/ RCC chargers and adapters in the 3 W universal range at equal or lower system cost with much higher performance and energy efficiency. LinkSwitch introduces a revolutionary 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 3 W output and 300 mW no-load consumption, a LinkSwitch solution can save the end user enough energy over a linear design to completely pay for the power supply cost in less than one year. LinkSwitch integrates 700 V power MOSFET, PWM control, high voltage start-up, current limit, and thermal shutdown circuitry, onto a monolithic IC.


DRAIN (D) Pin: Power MOSFET drain connection. Provides internal operating current for start-up. Internal current limit sense point for drain current. CONTROL (C) Pin: Error amplifier and feedback current input pin for duty cycle and current limit control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used as the connection point for the supply bypass and autorestart/compensation capacitor. SOURCE (S) Pin: Output MOSFET source connection for high voltage power return. Primary side control circuit common and reference point.

The duty cycle, current limit and operating frequency relationships with CONTROL pin current are shown in Figure 4. Figure 5 shows a typical power supply outline schematic which is used below to describe the LinkSwitch operation. Power Up During power up, as VIN is first applied (Figure 5), the CONTROL pin capacitor C1 is charged through a switched high voltage current source connected internally between the DRAIN and CONTROL pins (see Figure 2). When the CONTROL pin voltage reaches approximately 5.6 V relative to the SOURCE pin, the high voltage current source is turned off, the internal control circuitry is activated and the high voltage internal MOSFET starts to switch. At this point, the charge stored C1 is used to supply the internal consumption of the chip. Constant Current (CC) Operation As the output voltage, and therefore the reflected voltage across the primary transformer winding ramp up, the feedback CONTROL current IC increases. As shown in Figure 4, the internal current limit increases with IC and reaches ILIM when IC is equal to IDCT. The internal current limit vs. IC characteristic is designed to provide an approximately constant power supply output current as the power supply output voltage rises. Constant Voltage (CV) Operation When IC exceeds IDCS, typically 2 mA (Figure 4), the maximum duty cycle is reduced. At a value of IC that depends on power supply input voltage, the duty cycle control limits LinkSwitch peak current below the internal current limit value. At this point the power supply transitions from to CV operation. With minimum input voltage in a typical universal input design, this transition occurs at approximately 30% duty cycle. R1 (Figure 5) is therefore initially selected to conduct a value of IC approximately equal to IDCT when VOUT is at the desired value at the minimum power supply input voltage. The final choice R1 is made when the rest of the circuit design is complete. When the duty cycle drops below approximately 4%, the frequency is reduced, which reduces energy consumption under light load conditions. Auto-Restart Operation When a fault condition, such as an output short circuit or open loop, prevents flow of an external current into the CONTROL pin, the capacitor C1 discharges towards 4.7 V, autorestart is activated, which turns the MOSFET off and puts the control circuitry in a low current standby mode. In auto-restart, LinkSwitch periodically restarts the power supply so that normal power supply operation can be restored when the fault is removed.


Related products with the same datasheet
Some Part number from the same manufacture Power Integrations, Inc.
RD2TOPSWITCHR 85 to 132vac or 170 to 265vac Input, 8w(10w Peak) Output Reference Design Board
RD5TOPSWITCH-II 85 to 265 Vac Input, 20w (30w Peak) Output Reference Design Board
RD5TOPSWITCH-IIR 85 to 265vac Input, 20w (30w Peak) Output Reference Design Board
RD6TOPSWITCH-IIR 85 to 265vac Input, 15w Output Usb Reference Design Board
RD7TOPSWITCH-IIR 90 to 375vdc Input, 3.5w Output PC Standby Reference Design Board
RD8 Tinyswitch(tm) 85 to 265vac Input, 3w Output Reference Design Board
RD9 Tiny Switchtm User Configurable Input And Output Voltages Flyback Prototyping Board
SMP402 20-72 VDC Input Non-isolated DC Output
T0P243G Family Extended Power, Design Flexible,integrated Off-line Switcher
TIC116D Silicon Controlled Rectifiers
TIC216M Silicon Triacs
TIP130 NPN Silicon Power Darlingtons
TIP135 PNP Silicon Power Darlingtons
TNY253 0-10 W Tinyswitchfamily of Energy Efficient, Low Power Off-line Switcher Ics
TNY253G 0-10 W Tinyswitchfamily of Energy Efficient, Low Power Off-line Switcher Ics
TNY254 4-23 W Tinyswitch-iifamily of Energy Efficient, Low Power Off-line Switcher Ics

TOP221P : 0-150 W Topswitch-iiusing a 100/110 Vac Input or 0-90 W Universal Input (85-265 VAC)

DER-38 : 2.4W Power Supply Using Lnk520p

TOP246Y- : Topswitch-gx Family Extended Power, Design Flexible, Ecosmart, Integrated Off-line Switcher

TNY266GN : Enhanced, Energy Efficient, Low Power Off-line Switcher

RD6 : 85 to 265 VAC Input, 15W Output USB Reference Design Board

DAK-86 : Eval Board - Dc/dc & Ac/dc (off-line) Smp Programmers, Development System; KIT REF DES DPA 6.6W DC-DC CONV Specifications: Board Type: Fully Populated ; Main Purpose: Special Purpose DC/DC, Power Over Ethernet ; Regulator Topology: Flyback ; Outputs and Type: 1, Isolated ; Voltage - Output: 3.3V ; Current - Output: 2A ; Voltage - Input: 33 ~ 57V ; Frequency - Switching: 400kHz ; Power - Output: 6.6W ; Ut

LNK304GN-TL : Pmic - Ac Dc Converters, Offline Switcher Integrated Circuit (ics) Digi-Reel® -; IC OFFLINE SWIT OCP 8SMD Specifications: Packaging: Digi-Reel® ; Package / Case: 8-SMD (7 Leads), Gull Wing ; Power (Watts): 12mW ; Voltage - Input: - ; Voltage - Output: 700V ; Frequency Range: 62 ~ 70kHz ; Operating Temperature: -40°C ~ 150°C ; Output Isolation: Non-Isolated ; Lead Free Status: Lead Free ; RoHS Status: Ro

TOP255PG : Pmic - Ac Dc Converters, Offline Switcher Integrated Circuit (ics) Tube -; IC OFFLINE SWIT PROG OVP 8DIP Specifications: Packaging: Tube ; Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads ; Power (Watts): 30W ; Voltage - Input: - ; Voltage - Output: 700V ; Frequency Range: 59.4kHz ~ 72.6kHz ; Operating Temperature: -40°C ~ 150°C ; Output Isolation: Isolated ; Lead Free Status: Lead Free ; RoHS Status: R

0-C     D-L     M-R     S-Z