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NCP1027 Datasheet

High Voltage Switcher

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NCP1027
High−Voltage Switcher
for Medium Power Offline
SMPS Featuring Low
Standby Power
The NCP1027 offers a new solution targeting output power levels
from a few watts up to 15 W in a universal mains flyback application.
Our proprietary high−voltage technology lets us include a power
MOSFET together with a startup current source, all directly
connected to the bulk capacitor. To prevent lethal runaway in low
input voltage conditions, an adjustable brown−out circuitry blocks
the activity until sufficient input level is reached.
Current−mode operation together with an adjustable ramp
compensation offers superior performance in universal mains
applications. Furthermore, an Over Power Protection pin brings the
ability to precisely compensate all internal delays in high input voltage
conditions and optimize the maximum output current capability.
Protection wise, a timer detects an overload or a short−circuit and
stops all operations, ensuring a safe auto−recovery, low duty cycle burst
operation. An integrated, auto−recovery, Overvoltage Protection
permanently monitors the VCC level and temporarily shuts down the
driving pulses in case of an unexpected feedback loop runaway.
Finally, a great RDS(on) figure makes the circuit an excellent choice
for standby/auxiliary offline power supplies or applications requiring
higher output power levels.
Features
Built−in 700 V MOSFET with Typical RDS(on) of 5.8 W, TJ = 25°C
Current−Mode Fixed Frequency Operation: 65 kHz and 100 kHz
Fixed Peak Current of 800 mA
Skip−Cycle Operation at Low Peak Currents
Internal Current Source for Clean and Lossless Startup Sequence
Auto−Recovery Output Short Circuit Protection with Timer−Based
Detection
Auto−Recovery Overvoltage Protection with Auxiliary Winding
Operation
Programmable Brown−Out Input for Low Input Voltage Detection
Programmable Over Power Protection
Input to Permanently Latchoff the Part
Internal Frequency Jittering for Improved EMI Signature
Extended Duty Cycle Operation to 80% Typical
No−Load Input Standby Power of 85 mW @ 265 Vac
500 mW Loaded, Input Power of 715 mW @ 230 Vac
These are Pb−Free Devices
Typical Applications
Medium Power AC−DC Adapters for Chargers
Auxiliary/Standby Power Supplies for ATX and TVS Power Supplies
Reference
230 VAC
90−265 VAC
NCP1027 − 5.8 W
25 W*
15 W*
*Typical values, open−frame, 65 kHz version, RqJA < 75°C/W, TA = 50°C.
http://onsemi.com
MARKING
DIAGRAM
8−LEAD PDIP
P SUFFIX
CASE 626A
P1027PXXX
AWL
YYWWG
XXX = 65 or 100
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
VCC
Ramp Comp.
Brown−Out
FB
GND
OPP
(Top View)
Drain
ORDERING INFORMATION
Device
Package
Shipping*
NCP1027P065G
PDIP−8 50 Units / Rail
(Pb−Free)
NCP1027P100G
PDIP−8 50 Units / Rail
(Pb−Free)
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
December, 2006 − Rev. 3
1
Publication Order Number:
NCP1027/D


  ON Semiconductor Electronic Components Datasheet  

NCP1027 Datasheet

High Voltage Switcher

No Preview Available !

NCP1027
85−265 VAC
OPP*
OVP
NCP1027
18
+
27
BO 3
+ +4
5
*Optional component
Ramp
Comp.*
Figure 1. Typical Application
Vout
+
GND
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Function
1 VCC Powers the Internal
Circuitry
2
Ramp Comp.
Ramp Compensation
in CCM
3
Brown−Out
Brown−Out and
Latchoff Input
4 FB Feedback Signal Input
5
Drain
Drain Connection
−−
7
OPP
Over Power Protection
8 GND The IC Ground
Description
This pin is connected to an external capacitor of typically 22 mF. The VCC
includes an active shunt which serves as an auto−recovery overvoltage
protection.
To extend the duty cycle operation in Continuous Conduction Mode (CCM),
pin 3 offers the ability to inject ramp compensation in the controller. If unused,
short this pin to VCC.
By monitoring the bulk level via a resistive network, the circuit protects itself
from low mains conditions. If an external event brings this pin above 4.0 V,
the part fully latches off.
By connecting an optocoupler to this pin, the peak current setpoint is adjusted
accordingly to the output power demand.
The internal drain power switch circuit connection.
This unconnected pin ensures adequate creepage distance.
Driving this pin reduces the power supply capability in high line conditions. If
no Over Power Protection is needed, short this pin to ground.
http://onsemi.com
2


Part Number NCP1027
Description High Voltage Switcher
Maker ON Semiconductor
Total Page 30 Pages
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