Product Highlights

greatly simplified the CV/CC converter

Eliminating the optical coupling and all auxiliary CV/CC control circuits

Eliminate all control circuit compensation circuits [123 ]

Advanced performance function

Compensation transformer inductance tolerance

Compensation input cable voltage changes

Compensation cable voltage (LNK61X series)

Compensation external externally Component temperature changes

IC parameter tolerance using proprietary fine -tuning technology is very strict

Technology

frequency shake greatly reduced the cost of EMI filter

Use External resistors can achieve stricter output tolerances

Select/Pruning

The frequency of programmable switch is as high as 85 kHz to reduce the size of the transformer

Advanced protection/security function [ 123]

Automatic restarting protection can reduce output power of more than 95%

Short-circuit and control loop fault (component opening and short circuit)

Relax heat shutdown-automatic recovery reduction power

补给从外地返回

满足排水管和所有

PCB和封装上的其他引脚

生态智能 #8482;–节能

[ 123] Easily meet the global energy efficiency requirements

230 volt voltage, the air load consumption is less than 30 MW, which can be optional

outer bias winding

Open/off control control提供恒定的效率，低至非常轻的负载–适用于CEC和ENERGY STAR 2.0法规

无电流感应电阻器-最大限度地提高效率

绿色包装[ 123]

Packaged packaging without halogen

Application

mobile phone/rope phone, PDA, MP3/portable audio charger

device, adapter, LED, LED Driver, etc.

Explanation

Connecting switch #8482; -ii greatly simplified the low-power CV/CC charger to design by eliminating optocoupler and auxiliary control circuits. The device introduces revolutionary control technology to provide internal parameters to the internal parameter tolerance of the output voltage, compensation for transformers, and input voltage changes. This device integrates a 700 -volt power MOSFET, a novel switch control state, a high -voltage switch current source for self -partial pressure, frequency jitter, circulating current limit, and lagging heat closing single -piece integrated circuit.

Figure 1. Typical application/performance-non-simplified circuit (A) and output characteristic package (B).

Table 1. Output power table.

Note:

1. The minimum continuous power of typical non -ventilation closed adapters is measured at a+50 ° C environmental temperature, device, TJ LT; 100 degrees Celsius.

2. The maximum actual continuous power in the open frame design is the heat sink measured at 50 ° C's environmental temperature (more information is considered to be considered in key applications).

3. Packaging: P: DIP-8C, G: SMD-8C, D: SO-8C.

Point function description

Drainage (D) Sales: This pin is the power MOSFET drain connection. It provides an internal start -up and steady -state operating current.

Wingrs/multi -function programming (BP/m) pin: This pin has multiple functions: 1. It is a 6 V power supply inside the connection point of the external bypass container. 2. It is the LNK61X series of cable fall compensation.

Feedback (FB) pin: During the normal work period, the switch of the power MOSFET is controlled by control. The AC voltage on this pin sensing bias winding. This control input adjustment of the output voltage and output of the output voltage and output CC mode current based on the bias winding anti -gratical voltage. The internal electrical sensory correction circuit uses a positive voltage ON off -voltage winding to sensor the voltage of the capacitor.

Source quotation: This pin is connected to the output MOSFET source high -voltage power supply and control circuit.

Linkswitch II function description

Linkswitch II combined a high -voltage power MOSFET with a power controller switch with a power controller in a device. Similar to the connection switch LP and Tinyswitch III, the switch control is used to adjust the output voltage. In addition, the switching frequency is modulated and adjusted output current to provide constant current characteristics. Linkswitch II controller includes a oscillator, feedback (sensing and logic) circuit, 6 V registered, high temperature protection, frequency shake, current limitation circuit, cutting -edge faintness, inductive correction circuit, frequency control constant current adjustment and constant constant current Streaming control switch status machine.

Correction circuit

If a magnetized inductor is too high or too low, the converter will adjust the frequency of the oscillator. Because this controller is designed to proportions the output power of the discontinuous lead mode directly to the setting of the setting, its tolerance can be fully compensated by adjusting the switch.

Hengliu (CC) operation

As an output voltage, the anti -stimulus voltage bias winding increase, and the feedback foot voltage increases. This switching frequency is adjusted according to the feedback foot voltage to increase to provide providedConstant output current adjustment. This constant current circuit and inductance correction circuit are designed to run at the same time in the CC area.

Constant voltage (CV) operation

When the feedback pin is adjusted from the constant current close to VFBTH, the power supply is converted to CV operation. At this time, the switching frequency is the maximum value, corresponding to the peak power point of the CC/CV characteristics. The controller regulates the feedback pin voltage so that it keeps it in the VFBTH use of the open/off state machine. The feedback pin voltage is sampled 2.5ms after the high voltage switch is turned off. The load current limit is also reduced to reduce the volume density of the transformer.

Output cable compensation

This compensation cable in the entire load range in CV mode. As a converter load increased from the air load to the peak power point (transition point between CV and CC), the voltage introduced by the output end of the output end is to compensate the cable voltage by increasing the reference value of the feedback pins. The controller determines the output load, so the correct compensation level of the state output is the machine. 24 AWG (0.3 W) cables The cable drop compensation Select CBP 1 MF, and for 26 AWG (0.49 W) cable CPB 10 millivoltors.

Automatically restart and open loop protection

If there is a short -circuit or open circuit conditions such as output short circuit or opening, the circuit condition link II enters the appropriate protection mode as described below. If the feedback pin voltage decreases during the rejuvenation period, before the feedback needle sampling (about 2.5 ms) is lower than 0.7 V, the duration of more than 450 ms (automatic restart on-Time (tar on-time) enter the automatic restart, the transformer enters the automatic restart. The power MOSFET is for 2 seconds (~ 18%automatic restarting the duty cycle). Automatically restart the alternative to enable and disable the mosFet until the failure is excluded. In addition to the above automatic restart conditions, if the turnover cycle (the switch turn on time) Beyond 120 mAh, the converter notified it as the opening state (the top resistance was opened or lost in the potential partitioner), and from 450 milliseconds to about 6 clock cycles (90 milliseconds), while maintaining the disabled time for 2 seconds. Excessive heat protection thermal shutdown circuit sensing mold temperature. This threshold is set to 142 ° C, and the typical value is 60 ° C. Keep a disabled state decreased by 60 ° C. At this time, the MOSFET is re -enabled.

current limit

current in the current detection power MOSFET. When the current exceeds the internal threshold (ILIMIT), the power MOSFET The remaining time of this cycle is closed. The leading edge consumer circuit inhibit current restrictions The short -circuit power MOSFET time (TLEB). This cutting -edge has set up a hidden time to make the current peak capacitor and rectifier reverse recovery time. It will cause MOSFET transmission prematurely.The switch II also contains a DI/DT correction function to maximize the change of CC's changes in the input bank.

6.0 v regulator

6V regulator is a connected bypass capacitor charging by turning from MOSFET, please discharge. By -boarded sales are internal power voltage nodes. When the MOSFET is opened, the device is stored from the barrier container. The consumption of extremely low power internal circuits allows the connection switch II to continue to work continuously from the current from the discharge. The value of the bypass capacitor is 1 mF or 10 mf is enough to be high -frequency decoupling and energy storage.

Figure 5. The power -saving USB charger power supply (average efficiency of 74%, air load input power lt; 30 mW).

Circuit description

FIG. 5 The circuit shown in FIG. 5 is configured to use the voltage anti -gravity of LNK613DG with LNK613DG. With the average efficiency of 74%, the air load input power lt; 30MW design easily surpass the current strictest energy efficiency requirements.

Input filter

AC input power from diode D1 to D4 rectification. Correct DC power filtering by large -capacity storage capacitors C1 and C2. Electrochemical L1, C1, and C2 constitute a PI (π) filter, which is used to attenuate differential model EMI noise. This configuration and power integrated shielding transformer #8482; Technology allows this design to meet the electromagnetic interference standard EN55022 B level, which has a good amount of rain and does not require A Y capacitor, even if the output is connected to safe grounding. The melting resistor RF1 can prevent catastrophic failure. Its rated value should be charged when the input capacitor is connected for the first time when the input capacitor is connected for the first time.

LNK 613 Elementary

LNK613DG device (U1) includes power switch device, oscillator, CC/CV control engine, startup and protection functions. The integrated 700V MOSFET provides a large drain voltage amplitude in the general input and communication application, which improves reliability by allowing a larger transformer to rather. The device is completely by bypass and decoupled capacitor C4. For the LNK61X device, the instead of the bypass can also be selected for the output volume cable voltage compensation. 1 MF value select standard compensation. 10 MF value Select enhanced compensation. Table 2 shows the compensation volume of each device. The LNK60X device does not provide cable decline compensation.

A optional partial pressure power supply formed by D6 and C5 provides an operating U1 current through the resistor R4. This reduces the empty load consumption from ~ 200 MW to LT; 30 MW, which can also improve light load efficiency. The rectifier and filter input voltage are applied to a winding at a T1. On the other side of the transformer one side, the winding is driven by the MOSFET integrated in U1. Leakage inductive leakage voltage peak is limited by RCD-R clamping by D5,R2, R3 and C3 are composed.

Output rectification

The secondary winding of the transformer is more efficient by D7, A1A, 40V rectification, and is filtered by C7. If the lower efficiency is acceptable, you can use 1 PN knot diode, which is lower. In this application, the size of the C7 is the LC filter after the requirements of ripple -free ripples. The battery self -discharge requirements have been replaced with series resistors and Qina networks (R8 and VR1). However, the standard 1 KW resistor is required in the design.

Output adjustment

LNK613 uses the frequency control of the constant voltage regulating region (CC) regulation of the output characteristics. The feedback resistor (R5 and R6) uses a standard 1%resistor to make the nominal output voltage and the current regulatory threshold in the medium -custard.

Key application precautions

output power table

The maximum output power table of the data table (Table 1) indicates that the maximum actual continuous output power level is obtained under the following assumptions:

1. The minimum DC input voltage is 90V or higher, and the input voltage is 85VAC. The input capacitance value should be large enough to meet these AC input design standards.

2. The second output of 5 volts and Schottky rectifier diode.

3. Suppose the efficiency is 70%.

4. Intermittent mode operation (KP GT; 1.3).

5. This part is a sufficient copper area for the installation and source of the plate to maintain the source pins temperature or below 90 ° C.

6. The environmental temperature of the open frame design is 50 ° C. The internal case temperature of the adapter design is 60 ° C.

Note: If the output CC tolerance can achieve higher output power gt; ± 10%is acceptable, allowing the device to run the source pins temperature at a higher temperature.

Output tolerance

Linkswitch II provides ± 5%of the overall output tolerance (including lines, component changes and temperature) in the CV operation, and the ± 10 output current of the output current during CC operation period %

The temperature range of the p/g is wrapped from 0 ° C to 100 ° C. For D package (SO8), an additional CC deviation may occur due to the stress caused by the manufacturing process (ie, the welding wave immersion or infrared return). The example of power construction is recommended to verify the production tolerance of each design. I bypass capacitors are selected for Linkswitch II 60X series device (compensation without output cable pressure reduction), it is recommended to use 1 mf bypass pipe pipe capacitor. The voltage of the capacitor should be greater than 7V. The electronics material of the capacitor is not important, but the tolerance of the capacitor should be ≤ ± 50%. The physical location of this capacitor must be close to the connection switch II bypass sales. For LInkswitch II 61X series device (compensation compensation with output cable voltage) output cables can be used by bypass to attract electricity values. Value 1 MF Select Standard Cable Compensation. 10 millivolo capacitors choose enhanced cable compensation. Table 2 shows each connection switch II device and capacitor value. The capacitor can be ceramic or electrolytic, but the tolerance and temperature change should be ≤ ± 50%. The output voltage of the Pixls design electronic meter is to provide the maximum power as the power supply. The output voltage of the terminal at the end of the cable is multiplied by the value of the output voltage of the cable.

Linkswitch II layout considerations

Circuit plate layout

Linkswitch II is a highly integrated power solution integrated on a chip, the controller and high -voltage MOSFET. The existence of high switching current and high voltage uses the particularly important and good printing circuit board design practice with analog signal to ensure stability and failure operation

Table 2. Cable compensation changes The coefficient and equipment and bypass canal capacity. The recommended circuit board is shown in Figure 6 to connect the layout of the switch II.

When designing a power supply based on a Linkswitch II printing circuit board, the following criteria must be followed: a single point (Kelvin) connecting Linkswitch II power pins and biased input filter on the negative polar terminal of a single point ground is connected Capacitor winding circuit. This improves the current from the biased winding to the current to the input filter capacitor by returning to the asthma. Wingrsen container

The barrier pipe football container should be as close to the source and bypass feet as much as possible.

Feedback resistor

Place the feedback resistor directly on the Linkswitch II device. This coupling minimizes noise.

Thermal factors

The copper area connected to the source of the source provides Linkswitch II radiator. A good estimate is that Linkswitch II will consume 10%output power. Provide enough copper area to keep the source foot temperature below 90 ° C. The higher temperature is allowed to be acceptable only when the output current (CC) tolerance is greater than ± 10%. In this case, the maximum temperature of the source quotation is lower than the recommended 110 ° C to provide the differences (opening) of parts to parts RDS.

Secondary circuit area

In order to minimize the leakage and electromagnetic interference, the loop connection area of u200bu200bthe secondary winding, output diode and output filter capacitance should be minimized. In addition, sufficient copper area should be provided to provide anode and cathode heating sinking in the diode. At the quiet cathode terminal, it is best to use a larger area. The larger anode area will increase high -frequency radiation electromagnetic interference.

Static discharge of the spark space

Along the isolation barrierPlace a trace line to form a spark gap. Another electrode on the secondary electrode returns the return node from the output. The spark gap will input static discharge energy from the auxiliary back to the input. From AC input to spark gap electrodes should be separated from other traces to prevent unnecessary arcs from occurring and possible circuit damage.

Optimization of the drain pipe clip optimization

Connect the switch II induction feedback winding output. The voltage appeared on the feedback

Figure 6.PCB Layout Example Showing the 5.1W design of P package

Winding is a reflection of the secondary winding voltage, and Internal MOSFET is closed. So any leakage bell affects the output adjustment. Optimizing the drain pipe clip to minimize the high -frequency ringing as much as possible will give the best adjustment. Figure 7 shows the required drain voltage waveform, and it produces a large out -of -the -induction ring due to the leakage. This will reduce the output voltage adjustment performance. In order to reduce this value, please adjust the diode of the valuable diode of the string resistor.

In order to improve the efficiency of light load and reduce air input power consumption. Increasing the bias circuit can reduce the input power of the air load at 230 volts, from ~ 200 MW to less than 30 MW. Light loading efficiency will also be improved, which may avoid the relatively average efficiency requirements of the use of the Schottky Blossoms and the PN output diode. The power schematic diagram shown in Figure 5 has a bias circuit merger. The diode D6, C5, and R4 constitute a bias circuit. As the output voltage is less than 8V, the additional transformer winding needs, and the communication stack is at the top of the feedback winding. This provides a sufficiently high voltage, which can operate the switch frequency when the power supply is carried by the power load of the foot under low voltage. In FIG. 5, the additional bias winding (from pins 2 to pin 1) stacked together at the top of the feedback winding (pin 4 to needle 2). The diode D6 rectifier output end and C5 are filter capacitors. 10 UF capacitors are recommended to keep bias at low switching frequency. The type of capacitor is not important, but the rated voltage should be higher than the maximum value of VBIAS. It is recommended to enter the bypass feet equal to the IC power current (~ 0.5 mA) minimum bias winding voltage. The wire led current should not exceed 3 mA at a maximum bias winding voltage. The value of R4 is calculated based on (VBIAS -VBP)/IS2, where VBIAS (10 V typical values) are voltage on C5, IS2 (0.5 ma typical values) are IC power currents and VBP (6.0 V typical values) are bypass Spinning voltage. The parameters are 2 and VBP are provided in the parameter table of the Linkswitch II data table. The diode D6 can be any low -cost diode, such as FR102, 1N4148 or BAV19/20/21.

Quick design checklist

Like any power design, all Linkswitch II design should be verified on the test table to ensure that the component specifications do not exceed the worst case. The minimum value below is strongly recommended to make oneGroup test:

1. Maximum drain voltage-Verification peak VDS does not exceed 680 V at the highest input voltage and maximum output power.

2. Maximum leakage current-At the highest environmental temperature, the maximum input voltage and maximum output load, verify that the current waveform of the current waveform signs of the transformer is saturated and excessive. The front -edge of the connection switch II is 170 -nan seconds to prevent premature opening of the cycle.

3. Thermal inspection-at the maximum output power, the minimum and maximum input voltage and the highest ambient temperature; the confirmation temperature specification does not exceed the connection switch II, transformer, output diode and output capacitors. There should be enough changes in the RDS (ON) of Linkswitch II specified in a sufficient armal data. In order to ensure a 10%CC tolerance, the recommended temperature of the maximum source is 90 ° C.

Absolutely maximum rated value 1,5

Directory voltage -0.3 V to 700 V

Peak current: K613 320 (480 (480 (480 ) Miahota

LNK604/614 400 (600) Miahota

LNK605/615 504 (750) Miahota

lNK606/616 654 (980) millimeter An Shi

peak negative pulse leakage current-100 mA2

Feedback pins voltage -0.3 volt to 9 volts

Feedback pin current 100 mAh

] Winger-to-foot voltage -0.3 volt to 9 volts

Bingbing pin current 10 mAh

Storage temperature -65 ° C to 150 ° C

Working knot Temperature -40 ° C to 150 ° C

Lead temperature (3) 260 ° C

Note:

1. Refer to all the voltage of the power supply, TA 25 ° C Essence

2. The duration does not exceed 2ms.

3.1/16 inches. 5 seconds come out of the box.

4. The high leakage current voltage allows higher peaks at the same time during the leakage.

5. The maximum rated value can be adopted, one by one will not cause permanent damage to the product at a time. Long -term absolute maximum rating risk exposure may affect the reliability of the product.

Thermal resistance

Thermal resistance: P or G packaging: (QJA) 70 ° C/W2; 60 ° C/W3 (qjc) 1 11 ° C/W

] D packaging: (qja) …………………… 100 ° C/W2; 80 ° C/W3 (QJC) 1 30 ° C/W

Note:

1. Measure on the pin 8 (source) near the plastic interface.

2. Welded to 0.36 square inch. (232 square millimeters) 2 ounces (610 grams/square meter) copper.

3. Welded to 1 square inch. (645 square millimeters) 2 ounces (610 grams/square meter) copper.

Note:

A. The automatic restart time is a function of the switch frequency of Ton × IFB programming and the minimum frequency in the CC mode.

B. Compensation on the current limit threshold to eliminate the effects of current limitation delay. Therefore, the output current maintains the scope of the constant input bank.

C, IDSS1 is 80%of the BVDSS and the worst situation of leakage at the worst case of the highest working knot temperature. IDSS2 is a typical norm under the worst application conditions (corrected 265 volt voltage) of the worst application conditions of air -load consumption computing.

D. When the duty cycle exceeds DCMAX, the link switch II works in an extended mode of connection time.

E. This parameter is derived by features.

F. The mechanical stress generated during the assembly process may cause the parameter to change. This conversion has no effect on the ability of Linkswitch II to meet the requirements of CC ± 10%and CV ± 5%in batch production, and the design follows suggestions in the AN-44 and good manufacturing specifications.

G, switching frequency is programming between 60 kHz and 85 kHz.

Typical performance features

Typical performance characteristics (continued)

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