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L6590D bảng dữ liệu(PDF) 16 Page - STMicroelectronics

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Figure 34. Standby Function timing diagram
Brownout Protection (L6590D only)
Brownout Protection is basically a not-latched device shutdown functionality. It will typically be used to detect a
mains undervoltage (brownout). This condition may cause overheating of the primary power section due to an
excess of RMS current.
Figure 35. Brownout Protection Function internal schematic and timing diagram
Pout
Peak
Primary
Current
2ms
1ms
STANDBY
(filtered)
190 mA
80 mA
fsw
65 kHz
22 kHz
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000
STANDBY
(before filter)
Vout
Load
regulation
small glitch
HV Input bus
VinOK
Vcc
VON
VOFF
000000000000000000000
000000000000000000000
000000000000000000000
000000000000000000000
000000000000000000000
000000000000000000000
000000000000000000000
000000000000000000000
PWM
Vout
+
-
L6590D
2.5 V
VinOK
50 µA
HV Input bus
6.4 V
BOK
Vcc



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