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参数资料
型号： L6566BTR
厂商： STMICROELECTRONICS
元件分类： 稳压器
英文描述： 0.8 A POWER FACTOR CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16
封装： LEAD FREE, SOP-16
文件页数： 45/51页
文件大小： 624K
代理商： L6566BTR
L6566B
List of figures
5/51
List of figures
Figure 1.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Typical system block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3.
Pin connection (through top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
Multi-mode operation with QR option active . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 5.
High-voltage start-up generator: internal schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 6.
Timing diagram: normal power-up and power-down sequences . . . . . . . . . . . . . . . . . . . . 19
Figure 7.
Timing diagram showing short-circuit behavior (SS pin clamped at 5V). . . . . . . . . . . . . . . 20
Figure 8.
Zero current detection block, triggering block, oscillator block and related logic . . . . . . . . 20
Figure 9.
Drain ringing cycle skipping as the load is gradually reduced . . . . . . . . . . . . . . . . . . . . . . 22
Figure 10.
Operation of ZCD, triggering and oscillator blocks (QR option active) . . . . . . . . . . . . . . . . 23
Figure 11.
Load-dependent operating modes: timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 12.
Addition of an offset to the current sense lowers the burst-mode operation threshold . . . . 25
Figure 13.
Adaptive UVLO block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 14.
Possible feedback configurations that can be used with the L6566B . . . . . . . . . . . . . . . . . 26
Figure 15.
Externally controlled burst-mode operation by driving pin COMP: timing diagram. . . . . . . 27
Figure 16.
Typical power capability change vs. input voltage in QR flyback converters . . . . . . . . . . . 28
Figure 17.
Left: Overcurrent setpoint vs. VFF voltage; right: Line Feedforward function block . . . . . . 29
Figure 18.
Hiccup-mode OCP: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 19.
Frequency modulation circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 20.
Operation after latched disable activation: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 21.
Soft-start pin operation under different operating conditions and settings . . . . . . . . . . . . . 34
Figure 22.
OVP Function: internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 23.
OVP function: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 24.
Maximum allowed duty cycle vs. switching frequency for correct OVP detection. . . . . . . . 37
Figure 25.
Brownout protection: internal block diagram and timing diagram . . . . . . . . . . . . . . . . . . . . 38
Figure 26.
Voltage sensing techniques to implement brownout protection with the L6566B . . . . . . . . 39
Figure 27.
Slope compensation waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 28.
Typical low-cost application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 29.
Typical full-feature application schematic (QR operation) . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 30.
Typical full-feature application schematic (FF operation) . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 31.
Frequency foldback at light load (FF operation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 32.
Latched shutdown upon mains overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
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