NCP12600
Multi-Mode Controller for
Offline Power Supplies
The NCP12600 is a peak−current controller operating at a 65−kHz
or 100−kHz fixed frequency. In high power conditions, the part
operates in continuous conduction mode (CCM). As the load current
reduces, the converter enters the discontinuous conduction mode
(DCM) of operation and synchronizes the turn−on event with the
minimum of the drain voltage. The NCP12600 implements valley
switching mode with a proprietary lockout scheme ensuring
noise−free operations. As output power further reduces, the controller
folds the switching frequency back and ensures stable valley switching
www.onsemi.com
MARKING
DIAGRAM
TSOP−6
(SOT23−6)
SN SUFFIX
CASE 318G
STYLE 13
nd
operations down to the 32 valley provided the ringing is of sufficient
6zvAYWG
G
1
amplitude. The controller then enters a proprietary Quiet−Skip
skip−mode at small peak currents which reduces acoustic noise and
optimizes no−load standby power.
1
6zvAYW = Specific Device Code
Adjustable over power protection ensures a flat output power level
regardless of the operating input voltage. Slope compensation is
ensured via the insertion of a resistor in series with the current sense
pin and is thus user−adjustable. The device packs several useful
features such as an extremely fast short circuit protection, a soft start in
current and frequency plus a dedicated circuitry to avoid latch off in
case of a line cycle dropout.
z
v
A
Y
W
G
= A or 2 (frequency)
= E, F, G or H
= Assembly Location
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
Over temperature protection (OTP) is implemented at the current
sense pin and requires the connection of a simple NTC resistance to
the auxiliary winding. Over voltage protection (OVP) is done by
PIN CONNECTIONS
sampling the auxiliary plateau and exists at the V pin level.
cc
GND
FB
1
2
6
5
4
DRV
Features
V
CC
• 65−kHz or 100−kHz Fixed−frequency Operation
• Valley Switching in Discontinuous Conduction Mode for Improved
Efficiency
ZCD/Fault
3
CS
(Top View)
• Proprietary Valley Lockout for Controlled Operation in
Quasi−resonant Operation and Foldback Modes
• Proprietary Quiet Skip Mode for Noiseless Operation in Light Load
ORDERING INFORMATION
See detailed ordering, marking and shipping information on
page 3 of this data sheet.
• Adjustable Over Power Protection
• Single 64−ms Protection Timer or Dual OCP Protection in Option
• Frequency Foldback down to 25 kHz
• Auto−recovery or Latched Overload Protection
• Over Temperature Protection Combined on CS Pin
• Ultra−low Start−up Current Below 10 mA up to 125°C T
• Proprietary Quick Latched−state Reset Scheme
• These are Pb−Free and RoHS−compliant Devices
• True Output Short Circuit Protection with Pre−short
j
Compatibility
• Line Cycle Dropout Recovery in Latched OCP Mode
• 5−ms Soft Start on Both Peak Current and Frequency
for Lower Start−up Stress
Typical Applications
• Ac−dc Notebook Adapters, USB Adapters, Wall−mount
Power Supplies, Set Top Boxes, etc.
• Frequency Jitter in All Operating Modes
• Over Voltage Protection with Precise Auxiliary Voltage
Sampling Event
© Semiconductor Components Industries, LLC, 2018
1
Publication Order Number:
January, 2018 − Rev. 0
NCP12600/D
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