L6566BH 查看數據表（PDF） - STMicroelectronics

零件编号

产品描述 (功能)

生产厂家

L6566BH

Multimode controller for SMPS

STMicroelectronics 

L6566BH

Application information

Figure 7. Timing diagram showing short-circuit behavior (SS pin clamped at 5 V)

Vcc

(pin 5)

VccON

VccOFF

Vccrestart

Short circuit occurs here

GD

(pin 4)

Trep

t

< 0.03Trep

Vcc_OK

t

Icharge

t

0.85 mA

Figure 8. VHV rating vs. temperature

1.080

1.060

1.040

1.020

1.000

0.980

0.960

0.940

0.920

0.900

-50

-25

0

25

50

75

Tj ( C)

AM11483v1

100

125

150

AM11484v1

5.2

Zero-current detection and triggering block; oscillator block

The zero-current detection (ZCD) and triggering blocks switch on the external MOSFET if a

negative-going edge falling below 50 mV is applied to the input (pin 11, ZCD). To do so, the

triggering block must be previously armed by a positive-going edge exceeding 100 mV.

This feature is typically used to detect transformer demagnetization for QR operation, where

the signal for the ZCD input is obtained from the transformer’s auxiliary winding used also to

supply the L6566BH. The triggering block is blanked for TBLANK = 2.5 µs after MOSFET

Doc ID 16610 Rev 2

19/51

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