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STR-F6626 bảng dữ liệu(PDF) 5 Page - Allegro MicroSystems |
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STR-F6626 bảng dữ liệu(HTML) 5 Page - Allegro MicroSystems |
5 / 16 page Series STR-F6600 OFF-LINE QUASI-RESONANT FLYBACK SWITCHING REGULATORS 5 The voltage on the V IN terminal (pin 4) controls startup and shutdown of the Series STR-F6600 devices. Figure 1 shows a typical start up circuit. The V IN terminal voltage during startup is shown in figure 2. Functional Description and Operation continued, next page... Figure 1 – Start-Up Circuit VIN TIME DRIVE WINDING VOLTAGE 16 V (TYP.) UNDER-VOLTAGE LOCKOUT (VINQ) 11 V (MAX.) ON-STATE VOLTAGE (VINT) STARTUP DELAY Figure 2 – Waveform of V IN Terminal Voltage at Startup IIN VIN 11 V (MAX.) 30 mA (MAX.) 100 µA (MAX.) 14.4 V (MIN.) IIN(ON) IIN(OFF) Figure 3 – Supply Terminal Current, I IN At startup, C2 is charged through the startup resistor R S. When the V IN terminal voltage reaches 16 V (typ.), the control circuit enables regulator operation. Once the regulator starts, it draws up to 30 mA from C2 causing the voltage on C2 to fall momentarily. Once the regulator output voltage is established, the drive winding D starts to charge C2 via D2. The voltage on C2 thus recovers to the nominal drive voltage (18 V). As shown in figure 3, the input current is below 100 µA (at T M = 25°C) prior to control circuit turn on. The latch circuit holding current is 400 µA (max.). To ensure latch operation, the current in R S at the lowest ac input voltage should be at least 500 µA. The value of R S thus determines the charge time of C2 and thus the startup delay. R S is typicaly 68 kΩ for wide operation (90 V ac to 265 V ac) and 100 k Ω for 220 volt ac operation. The choice of C2 is a compromise between an accept- able startup delay (in conjunction with R S) and a hold-up time sufficient to keep pin 4 above its under-voltage shutdown threshold of 11 V. Typically C2 is in the range of 47 µF to 100 µF. |
Số phần tương tự - STR-F6626 |
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Mô tả tương tự - STR-F6626 |
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