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L6590A Datasheet(PDF) 14 Page - STMicroelectronics

Part # L6590A
Description  FULLY INTEGRATED POWER SUPPLY
PDF  19 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6590A Datasheet(HTML) 14 Page - STMicroelectronics

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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
Pout
Peak
Primary
Current
2ms
1ms
STANDBY
(filtered)
190 mA
80 mA
fsw
65 kHz
22 kHz
00000000000000000000000000000000000000000000
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00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000
STANDBY
(before filter)
Vout
Load
regulation
small glitch
HV Input bus
VinOK
Vcc
VON
VOFF
00000000000000000000
00000000000000000000
00000000000000000000
00000000000000000000
00000000000000000000
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00000000000000000000
00000000000000000000
PWM
Vout
+
-
L6590A
2.5 V
VinOK
50 µA
HV Input bus
6.4 V
BOK
Vcc



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