Features

Very precise adjustable output overput

Protection

Tracking enhancement function

Feedback circuit fault protection (closed shutdown) [123)

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Class connector pwm interface

Controller

Input voltage feedback (1/v2)

The saturation detection of inductors (only

L6563 )

Remote opening/level control

Low -start current (≤90 μA)

5MA maximum static current

1.5%(@tj 25 ° C) Internal reference voltage

-600/+800 MA totem rod driver

During the UVLO period, take the initiative to pull down

SO14 package

Application

PFC pre-adjustment device:

High-end AC-DC adapter/charger

desktop computer, server, network server

conforms to IEC61000-3-2-2 Or Jeida-Mitismps, more than 350W

This device is a current mode PFC controller working under the transition mode (TM). Based on the core of the standard TM PFC controller, it provides improved performance and additional functions. Highly linear multiplication and a special correction circuit can reduce the influenza of cross -power supply, allowing the extremely low to be within the large load range. The output voltage is internal reference voltage from the voltage mode error amplifier and precision (1.5%@tj 25 °c). The stability and temporary voltage feedback of the circuit improve the response function (1/V2 correction) to the power supply voltage mutation. In addition, the IC also provides options for tracking boost operations (output voltage changes with power voltage). The characteristic of this device is very low consumption (before startup, ≤90 μA, run ≤5 ma). In addition to the effective two -step OVP of normal operation overvoltage, IC also provides a protection settings for feedback circuit failure or error output voltage.

In L6563, a protective device was added to prevent the PFC -level saturation from stopping the voltage sensor. L6563A does not include this function. This is the only difference between the two parts between the two. The interface of the PWM controller provided by the PFC pre-regulator PWM controller is provided: the purpose is to stop running the PFC-level abnormality when the converter is stopped when the following situation occurs (feedback circuit failure, the iron heart saturation of the boosting electrical sensor)) It is only applicable to L6563 and disable the PFC grade in the case of the light load of the DC DC converter, so that it is easier to comply with energy -saving specifications (blue angel, EnergystAR, Energy2000, etc.). This device includes remote disable functions that are used as the main control system and those who work in the PFC pre -controller. Totem polar output level can withstand 600 mm of Anyuan current and 800 mAh current, which is a suitable drive large current MOSFET or IGBT. Combined with other functions and fixed closing time control operation with patents, the equipment is suitable for the high-quality and low-cost SMPS solutions for EN61000-3-2 standards of more than 350W.

Electric characteristics

Table 5. Electrical characteristics

GD LT; -12 ℉, GD 125 ° C and GND; unless there are other regulations)

Table 5. Electrical characteristics (continued)

GD LT; -12 ℉, GD 125 ° C and GND; unless there are other regulations)

Table 5. Electrical characteristics (continued)

GD LT; -12 ℉, GD 125 ° C and GND; unless there are other regulations)

Table 5. Electrical characteristics (continued)

GD LT; -12 ℉, between GD 125 ° C and GND; unless there are other regulations)

(1) (2) The parameters are followed by each other

(3) multiplication output from the following formulas:

(4) The parameters are guaranteed by the design, and the functional test is in production.

Typical electrical performance

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Overvoltage protection

Generally, the output voltage VO of the voltage control circuit is close Set the ratio of the resistor R1 and R2 of the assignor. Ignore the tipper component. Under the stable conditions, the current is equal to R2 through R1. Considering that the non -inverter input of an error amplifier is 2.5V, the voltage at the pins will also be 2.5V, then:

If the output voltage If a mutation #8710; VO occurs, the voltage at the pin INV is kept at 2.5V and the local feedback of the large device is kept by error. Then keep the current of R2 equal to 2.5/R2, but it becomes:

Differential current #8710; IR1 i #39; R1 #8710; VO/R1 will flow through the compensation network and then enter an error placed (pin compensation). When the current is monitored by about 18 μA inside the IC, the output voltage of the multiplier is forced to reduce, thereby reducing the energy absorbed from the power supply. If the current exceeds 20 μA, the OVP (dynamic OVP) is triggered, and the external power transistor is turned off until the current drops by about 5 μA. However, if the overvoltage continues to exist (for example, the load is completely disconnected), the error amplifier will eventually be saturated, thereby triggering the internal comparator (static OVP) to keep the external power switch off until the output voltage is restored to the approximately specified value. The step of output overvoltage triggers OVP function is:

An important advantage of this technology is that the overvoltage level has nothing to do with the adjustment output voltage: the latter depends on R1 and R2 The ratio of the former is about the individual value of R1. Another advantage is accuracy: the tolerance detection current is 15%, which means that the tolerance of #8710; VO is 15%. Because it is usually much smaller than VO, the tolerance of the absolute value will be reduced in proportion.

Example: VO 400V, #8710; VO 40V.

then: R1 40V/20μA 2m ; R2 2.5 · 2m ·/(400-2.5) 12.58k

OVP levels caused by L6563/A are 40 · 0.15 6V, that is, ± 1.36%. When any OVP is activated, the static consumption is reduced, and the VCC capacitor is discharged at a minimized VCC capacitor.

Feedback fault protection (FFP)

The above OVP function can handle the normal overvoltage conditions, that is,. Due to the sudden change of the load/line or the failure occurred during startup. It cannot handle, for example, when the upper resistor (R1) of the output divisor fails, an overvoltage will be generated: the voltage circuit cannot read the information of the output voltage, forced PFC pre -junction to work at the maximum connection time, resulting in the maximum connection time, resulting The increase in output voltage cannot be controlled. A pin of the device (PFC_OK) is dedicated to providing an output voltage with an independent resistor division (R3 high, R4 low, see Figure 34). If the output voltage exceeds the preset value, the voltage at the pin of the needle reaches 2.5V value, which is usually greater than the maximum VO that can be expected, and also includes the worst case load/line transient. Example: VO 400V, VOX 475V. Selected: r3 3m ; then R872 475.5 (R5.5Ω 472.5Ω). When the function is triggered, the door -driven activity stopped immediately. When the equipment was closed, its static consumption was reduced to less than 250 μA, and the condition was lockedThe source voltage is higher than the UVLO threshold. At the same time, the pwm U 被 lock is asserted to be high level. PWM locks are an open source output that can provide a minimum of 3.7V and a load of 0.5mA. It is used to integrate PWM's atresia and closing function. It is necessary to recover the input power supply to the re -start -up system, so that the VCC voltage and L6563/A and PWM controller are lower than their respective UVLO thresholds. PFC_OK pins doubled it as a function disabled as a non -locking IC: the voltage below 0.2V will turn off the IC and reduce its consumption to less than 1 milliang. In this case, PWM_ stops high impedance state with PWM locks. To restart the integrated circuit, just make the voltage needle higher than 0.26 V. Please note that this function not only provides feedback circuit failure or error settings, but also prevents its own protection. An any one -resistance PFC U OK distributor faults short -circuit or disconnect or PFC_OK pin float will cause the IC and stop the pre -regulator.

Female feedback voltage

The power level gain of the power factor correctional pre -mortar device changes the voltage with the square of the input balance. The cross frequency FC of the entire loop gain is also because the gain has a single pole characteristic. This has led to a large amount of weighing in the design. For example, setting the gain of an error amplifier to FC 20 Hz@264 VAC means that it has FC #8773; 4 Hz@88 VAC, which causes the control dynamics slowly. In addition, the slow control loop is limited by the output dynamic output of the multiplicator when the route or load changes rapidly. Select the sensor of the sensor to make the full load pass through the minimum line voltage conditions, and to a certain amount of maximum. However, the fixed current limit allows to enter excessive power in the high -voltage line, while the fixed power limit requires that the current limit is inversely proportional to the line voltage. The voltage feedback can compensate the change of the absorbent of the absolute subdivise and allow all the above issues. It includes derivating a proportional voltage input effective value voltage, input this voltage into the square/removal circuit (1/V2 correctioner) and provides the generated signal to 35).

这样，线电压的变化将引起倍增器输出处的半正弦振幅（如果线电压使乘法器输出将减半，反之亦然），以使The current benchmark adapts to the new operating conditions (ideal circumstances) without calling an error amplifier. In addition, the loop gain will maintain a constant range in the entire input voltage, which greatly improves the dynamic performance of the low line and simplifies the ring design. In fact, the voltage that derives the voltage of the equal square root line is proportional to a form of integration, which has its own time constant. If the voltage is too small, the generated voltage will receive a considerable number of ripples at twice the frequency of power supply, which will lead to distortion current benchmark (resulting in high THD and low power factor); if it is too large, there will be one of the settings positive settings positive settings.There is a considerable delay in the quantity of feedback, which leads to the overwhelming and underwriting voltage changes of the output voltage of the excessive pre -pre -adjusted node.Obviously, weighing.This device uses two technologies to achieve voltage forwarding external components, which limits the problem of feedback time constant to a direction.The capacitor CFF and resistor RFF are connected from VFF (pin 5) pins to ground to complete a internal peak maintenance circuit. The DC voltage provided by it is equivalent to applying a rectified sine wave peak on PIN Mult (PIN 3).RFF provides a way to discharge CFF when the line voltage is reduced (see Figure 35).In this way, in case the voltage of the line suddenly increases, CFF will quickly charging the output end of the pre -regulator through low impedance. Internal diode and obvious overching invisible line voltage decrease, CFF will use time constant RFF · CFF · CFFThe discharge is reached within 100 milliseconds to reach acceptable low -stable ripples and low -speed inflammation; therefore, the output voltage will go through a considerable amount of output, such as in a system without feedback compensation.