NCL30001 Datasheet, PDF (30/31 Pages) ON Semiconductor – High-Efficiency Single Stage Power Factor Correction and Step-Down Offline LED Driver

V_CC
V_CC(on)
V_CC(off)
NCL30001
t
DRV
t
Latch−Off
V_latch(high) ^{Latch−Off}
V_latch(low)
Latch−Off
t
Figure 61. Relationship Between the Latch−Off, V_CC, and DRV
The Latch−Off pin is clamped at 3.5 V. A 50 mA (typical)
pull−up current source is always on and a 100 mA (typical)
pull−down current source is enabled once the Latch−Off pin
voltage reaches 3.5 V (typical). This effectively clamps the
Latch−Off pin voltage at 3.5 V. A minimum pull−up or
pull−down current of 50 mA is required to overcome the
internal current sources and latch the controller. The
Latch−Off input features a 50 ms (typical) filter to prevent
latching the controller due to noise or a line surge event.
The startup circuit continues to cycle V_CC between
V_CC(on) and V_CC(off) while the controller is in latch mode.
The controller exits the latch mode once power to the system
is removed and V_CC drops below V_CC(reset).
APPLICATION INFORMATION
ON Semiconductor provides an electronic design tool,
facilitate design of the NCL30001 and reduce development
cycle time. The design tool can be downloaded at
www.onsemi.com.
The electronic design tool allows the user to easily
determine most of the system parameters of a single PFC
stage The tool evaluates the power stage as well as the
frequency response of the system.
ORDERING INFORMATION
Device
Package
Shipping^†
NCL30001DR2G
SO−16
(Pb−Free)
2500 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
http://onsemi.com
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