NCP1654_09 ONSEMI [ON Semiconductor], NCP1654_09 Datasheet - Page 21

• Manufacturer Part Number: NCP1654_09
• Description: Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters
• Manufacturer: ONSEMI [ON Semiconductor]

V
to prevent the circuit from operating when Vcc is too low
in order to ensure a proper operation. An UVLO
comparator monitors V
to operate when V
Thermal Shutdown
drive and then keeps the power switch off when the junction
temperature exceeds 150°C. The output stage is then
cc
The device incorporates an Undervoltage Lockout block
An internal thermal circuitry disables the circuit gate
Undervoltage LockOut (UVLO)
cc
cc
State
exceeds 10.5 V typically. The
pin voltage to allow the NCP1654
I
CC
<75 mA
OFF
Figure 47. V
V
cc
CC(OFF)
http://onsemi.com
Undervoltage LockOut (UVLO)
21
6 mA
ON
comparator incorporates some hysteresis (1.5 V) to prevent
erratic operation as the V
goes below the UVLO comparator lower threshold (9 V
typically), the circuit turns off. It is illustrated in Figure 47.
After startup, the operating range is between 9 V and 20 V.
enabled once the temperature drops below typically 120°C
(i.e., 30°C hysteresis). The thermal shutdown is provided
to prevent possible device failures that could result from an
accidental overheating.
V
CC(ON)
cc
crosses the threshold. When V
V
V
CC
CC
cc