NCP1605, NCP1605A, NCP1605B
http://onsemi.com
30
Figure 71. Startup and Brown Out Conditions
When the high voltage, startup current source is on, the brownout is active and its threshold is the upper one (V
BO
= V
BO
H = 1 V).
V
out
Regulation Level
V
CC
STUP
V
CC
OFF
1 V
0.5 V
The Circuit is Off e Low Consumption
V
CC
ON
OFF
V
CC
V
OUT
BrownOut
Pin Voltage
Drive Output
Circuit State
pfcOK
V
CC
INHIBIT
Fault Management Block
When any of the following faults is detected: brownout
( BO_NOK ), Undervoltage ( UVP ), shutdown
( STDWN ), Die Overtemperature ( TSD ), the circuit
immediately turns off and recovers operation as soon as the
fault disappears.
In case of UVLO (V
CC
too low to allow operation), the
circuit keeps off until the end of the next V
CC
charge phase
by the HV startup current source.
The following block diagram details the function.
HVCS_ON
Internal
Thermal
Shutdown
TSD
OFF
UVLO
(Vcc
Stdwn
BO_NOK
UVP
R
Q
S
UVLO
Latch
Figure 72. Fault Management Block
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