L6566BH Ver la hoja de datos (PDF) - STMicroelectronics

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L6566BH

Multimode controller for SMPS

STMicroelectronics 

L6566BH

List of figures

List of figures

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Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Typical system block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Pin connection (through top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Multimode operation with QR option active . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

High voltage startup generator: internal schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Timing diagram: normal power-up and power-down sequences . . . . . . . . . . . . . . . . . . . . 18

Timing diagram showing short-circuit behavior (SS pin clamped at 5 V) . . . . . . . . . . . . . . 19

VHV rating vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Drain ringing cycle skipping as the load is gradually reduced . . . . . . . . . . . . . . . . . . . . . . 20

Operation of ZCD, triggering and oscillator blocks (QR option active) . . . . . . . . . . . . . . . . 22

Load-dependent operating modes: timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Addition of an offset to the current sense lowers the burst-mode operation threshold . . . . 23

Adaptive UVLO block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Possible feedback configurations that can be used with the L6566BH . . . . . . . . . . . . . . . 24

Externally controlled burst-mode operation by driving the COMP pin: timing diagram. . . . 25

Typical power capability change vs. input voltage in QR flyback converters . . . . . . . . . . . 26

Left: overcurrent setpoint vs. VFF voltage; right: line feedforward function block. . . . . . . . 27

Hiccup-mode OCP: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Frequency modulation circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Operation after latched disable activation: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . 32

Soft-start pin operation under different operating conditions and settings . . . . . . . . . . . . . 33

OVP function: internal block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

OVP function: timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Maximum allowed duty cycle vs. switching frequency for correct OVP detection. . . . . . . . 36

Brownout protection: internal block diagram and timing diagram . . . . . . . . . . . . . . . . . . . . 37

Voltage sensing techniques to implement brownout protection with the L6566BH . . . . . . 38

Slope compensation waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Typical low-cost application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Typical full-feature application schematic (QR operation) . . . . . . . . . . . . . . . . . . . . . . . . . 43

Typical full-feature application schematic (FF operation) . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Frequency foldback at light load (FF operation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Latched shutdown upon mains overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

SO16N package drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Recommended footprint (dimensions are in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Doc ID 16610 Rev 2

5/51

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