NCP1050, NCP1051,
NCP1052, NCP1053,
NCP1054, NCP1055
Monolithic High Voltage
Gated Oscillator Power
Switching Regulator
The NCP1050 through NCP1055 are monolithic high voltage
regulators that enable end product equipment to be compliant with low
standby power requirements. This device series combines the required
converter functions allowing a simple and economical power system
solution for office automation, consumer, and industrial products.
These devices are designed to operate directly from a rectified AC line
source. In flyback converter applications they are capable of providing
an output power that ranges from 6.0 W to 40 W with a fixed AC input
of 100 V, 115 V, or 230 V, and 3.0 W to 20 W with a variable AC input
that ranges from 85 V to 265 V.
This device series features an active startup regulator circuit that
eliminates the need for an auxiliary bias winding on the converter
transformer, fault detector and a programmable timer for converter
overload protection, unique gated oscillator configuration for extremely
fast loop response with double pulse suppression, power switch current
limiting, input undervoltage lockout with hysteresis, thermal shutdown,
and auto restart fault detection. These devices are available in
economical 8−pin dual−in−line and 4−pin SOT−223 packages.
Features
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MARKING
DIAGRAMS
8
DIP−8
CASE 626A
P SUFFIX
1
Pin: 1.
2.
3, 7−8.
4.
5.
1
V
CC
Control Input
Ground
No Connection
Power Switch Drain
NCP105XZ
AWL
YYWW
8
4
4
1
SOT−223
CASE 318E
ST SUFFIX
1
Pin: 1.
2.
3.
4.
V
CC
Control Input
Power Switch Drain
Ground
•
Startup Circuit Eliminates the Need for Transformer Auxiliary Bias
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Winding
Optional Auxiliary Bias Winding Override for Lowest Standby
Power Applications
Converter Output Overload and Open Loop Protection
Auto Restart Fault Protection
IC Thermal Fault Protection
Unique, Dual Edge, Gated Oscillator Configuration for Extremely
Fast Loop Response
Oscillator Frequency Dithering with Controlled Slew Rate Driver for
Reduced EMI
Low Power Consumption Allowing European Blue Angel Compliance
On−Chip 700 V Power Switch Circuit and Active Startup Circuit
Rectified AC Line Source Operation from 85 V to 265 V
Input Undervoltage Lockout with Hysteresis
Oscillator Frequency Options of 44 kHz, 100 kHz, 136 kHz
AC−DC Converters
Wall Adapters
Portable Electronic Chargers
Low Power Standby and Keep−Alive Supplies
N5XZ
ALYW
X
Z
A
WL, L
YY, Y
WW, W
= Current Limit (0, 1, 2, 3, 4, 5)
= Oscillator Frequency (A, B, C)
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
See detailed ordering and shipping information on page 22 of
this data sheet.
Typical Applications
©
Semiconductor Components Industries, LLC, 2003
1
July, 2003 − Rev. 7
Publication Order Number:
NCP1050/D
NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055
+
AC Line
Input
+
Snubber
+
Converter
DC Output
−
Power Switch Circuit Output
V
CC
+
1
5
Startup & V
CC
Regulator Circuit
Power
Switch
Circuit
Fault Detector
Control Input 2
Oscillator &
Gating Logic
Ground
3, 7−8
Figure 1. Typical Application
Pin Function Description
Pin
(SOT−223)
1
Pin
(DIP−8)
1
Function
V
CC
Description
This is the positive supply voltage input. During startup, power is supplied to this input
from Pin 5. When V
CC
reaches V
CC
(on), the Startup Circuit turns off and the output is
allowed to begin switching with 1.0 V hysteresis on the V
CC
pin. The capacitance
connected to this pin programs fault timing and frequency modulation rate.
The Power Switch Circuit is turned off when a current greater than approximately
50
mA
is drawn out of or applied to this pin. A 10 V clamp is built onto the chip to
protect the device from ESD damage or overvoltage conditions.
This pin is the control circuit and Power Switch Circuit ground. It is part of the
integrated circuit lead frame.
2
2
Control Input
4
−
3
3, 7, 8
4
5
Ground
No Connection
Power Switch
Drain
This pin is designed to directly drive the converter transformer primary, and internally
connects to Power Switch and Startup Circuit.
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2
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