l6590a STMicroelectronics, l6590a Datasheet - Page 14

• Manufacturer Part Number: l6590a
• Description: Fully Integrated Power Supply
• Manufacturer: STMicroelectronics

L6590A
Figure 28. Standby Function timing diagram
Brownout Protection
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 29. Brownout Function internal schematic and timing diagram
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HV Input bus
BOK
50 µA
6.4 V
2.5 V
(before filter)
STANDBY
STANDBY
+
-
(filtered)
Primary
Current
Peak
Vcc
Pout
Vout
f
sw
VinOK
L6590A
65 kHz
80 mA
2 ms
HV Input bus
small glitch
22 kHz
VinOK
PWM
Vout
V
V
regulation
190 mA
Vcc
OFF
ON
Load
1 ms