© Semiconductor Components Industries, LLC, 2017
January, 2017 − Rev. 3
1 Publication Order Number:
NCP1602/D
NCP1602
Enhanced, High-Efficiency
Power Factor Controller
The 6−pin PFC controller NCP1602 is designed to drive PFC boost
stages. It is based on an innovative Valley Synchronized Frequency
Fold−back (VSFF) method. In this mode, the circuit classically
operates in Critical conduction Mode (CrM) when V
control
voltage
exceeds a programmable value V
ctrl,FF
. When V
control
is below this
preset level V
ctrl,FF
, the NCP1602 (versions [B**] and [D**]) linearly
decays the frequency down to about 30 kHz until V
control
reaches the
SKIP mode threshold. VSFF maximizes the efficiency at both
nominal and light load. In particular, the stand−by losses are reduced
to a minimum. Like in FCCrM controllers, internal circuitry allows
near−unity power factor even when the switching frequency is
reduced. Housed in a TSOP6 package, the circuit also incorporates the
features necessary for robust and compact PFC stages, with few
external components.
General Features
• Near−Unity Power Factor
• Two−Level Boost Follower Line Level Dependent (disabled by default)
• Critical Conduction Mode (CrM)
• Valley Synchronized Frequency Fold−back (VSFF): Low Frequency
Operation is Forced at Low Current Levels
• Works With or Without a Transformer w/ ZCD Winding (simple inductor)
• On−time Modulation to Maintain a Proper Current Shaping in VSFF Mode
• Skip Mode at Very Low Load Current (versions[ B**] and [D**])
• Fast Line / Load Transient Compensation (Dynamic Response Enhancer)
• Valley Turn−on
• High Drive Capability: −500 mA / +800 mA
• V
CC
Range: from 9.5 V to 30 V
• Low Start−up Consumption for:
[**C] & [**D] Versions: Low Vcc Start−up level (10.5 V)
[**A] & [**B] Versions: High Vcc Start−up level (17.0 V)
• Line Range Detection for Reduced Crossover Frequency Spread
• This is a Pb−Free Device
Safety Features
• Thermal Shutdown
• Non−latching, Over−Voltage Protection
• Second Over−Voltage Protection
• Brown−Out Detection
• Soft−Start for Smooth Start−up Operation ([**C] &
[**D] Versions)
• Over Current Limitation
• Disable Protection if the Feedback Pin is Not Connected
• Low Duty−Cycle Operation if the Bypass Diode is
Shorted
• Open Ground Pin Fault Monitoring
Typical Applications
• PC Power Supplies
• Lighting Ballasts (LED, Fluorescent)
• Flat TV
• All Off Line Appliances Requiring Power Factor
Correction
PIN CONNECTIONS
1
3
DRV
VCTRL
2
CS / ZCD
4
FB
6
(Top View)
5
V
CC
TSOP−6
SN SUFFIX
CASE 318G
MARKING DIAGRAM
GND
www.onsemi.com
(Note: Microdot may be in either location)
1
XXX AYWG
G
1
XXX = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
See detailed ordering, marking and shipping information in the
package dimensions section on page 2 of this data sheet.
ORDERING INFORMATION
