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Monolithic Switcher. NCP1015 Datasheet |
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NCP1015
Self-Supplied Monolithic
Switcher for Low Standby-
Power Offline SMPS
The NCP1015 integrates a fixed−frequency current−mode
controller and a 700 V voltage MOSFET. Housed in a PDIP−7 or
SOT−223 package, the NCP1015 offers everything needed to build a
rugged and low−cost power supply, including soft−start, frequency
jittering, short−circuit protection, skip−cycle, a maximum peak
current set−point and a Dynamic Self−Supply (no need for an auxiliary
winding).
Unlike other monolithic solutions, the NCP1015 is quiet by nature:
during nominal load operation, the part switches at one of the available
frequencies (65−100 kHz). When the current set−point falls below a
given value, e.g. the output power demand diminishes, the IC
automatically enters the so−called skip cycle mode and provides
excellent efficiency at light loads. Because this occurs at typically 0.25
of the maximum peak value, no acoustic noise takes place. As a result,
standby power is reduced to the minimum without acoustic noise
generation.
Short−circuit detection takes place when the feedback signal fades
away e.g. un−true short−circuit or is broken optocoupler cases. Finally
soft−start and frequency jittering further ease the designer task to
quickly develop low−cost and robust offline power supplies.
For improved standby performance, the connection of an auxiliary
winding stops the DSS operation and helps to consume less than
100 mW at high line.
Features
• Built−in 700 V MOSFET with typical RDS(on) of 11 W
• Large Creepage Distance between High−voltage Pins
• Current−mode Fixed Frequency Operation: 65 kHz − 100 kHz
• Skip−cycle Operation at Low Peak Currents Only: No Acoustic Noise!
• Dynamic Self−Supply, No Need for an Auxiliary Winding
• Internal 1 ms Soft−start
• Auto−recovery Internal Output Short−circuit Protection
• Frequency Jittering for Better EMI Signature
• Below 100 mW Standby Power if Auxiliary Winding is Used
• Internal Temperature Shutdown
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient and AC Analysis
• This is a Pb−Free Device
Typical Applications
• Low Power ac−dc Adapters for Chargers
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
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MARKING
DIAGRAMS
8
1
PDIP−7
CASE 626A
AP SUFFIX
P1015APyy
AWL
YYWWG
1
4
4 SOT−223
CASE 318E
1 ST SUFFIX
AYW
1015y G
G
1
yy
y
A
WL
YY
WW
G or G
= 06 (65 kHz), 10 (100 kHz)
= A (65 kHz), B (100 kHz)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(*Note: Microdot may be in either location)
PIN CONNECTIONS
PDIP−7
VCC 1
NC 2
8 GND
7 GND
GND 3
FB 4
5 DRAIN
(Top View)
SOT−223
VCC 1
FB 2
4 GND
DRAIN 3
(Top View)
© Semiconductor Components Industries, LLC, 2011
March, 2011 − Rev. 3
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 20 of this data sheet.
1 Publication Order Number:
NCP1015/D
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NCP1015
Indicative Maximum Output Power from NCP1015
RDS(on) − Ip
230 Vac
11 W − 450 mA DSS
14 W
11 W − 450 mA Auxiliary Winding
19 W
1. Informative values only, with: Tamb = 50°C, circuit mounted on minimum copper area as recommended.
100 − 250 Vac
6.0 W
8.0 W
Vout
+
100−250 Vac
+
+
18
27
3
45
Figure 1. Typical Application Example
GND
PIN FUNCTION DESCRIPTION
Pin No.
SOT−223
PDIP−7
Pin Name
1 1 VCC
− 2 NC
− 3 GND
2 4 FB
3 5 DRAIN
− −−
− 7 GND
4 8 GND
Function
Powers the Internal Circuitry
−
The IC Ground
Feedback Signal Input
Drain Connection
−
The IC Ground
The IC Ground
Description
This pin is connected to an external capacitor of typically
10 mF. The natural ripple superimposed on the VCC
participates to the frequency jittering. For improved
standby performance, an auxiliary VCC can be connected
to Pin 1. The VCC also includes an active shunt which
serves as an opto fail−safe protection.
−
−
By connecting an optocoupler to this pin, the peak current
setpoint is adjusted accordingly to the output power
demand.
The internal drain MOSFET connection.
−
−
−
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NCP1015
VCC 1
VCC Startup Source
Drain
8 GND
UVLO
Management
High when VCC t 3 V
Rsense
250 ns
L.E.B.
NC 2
4V
18 k
EMI Jittering
65 kHz
100 kHz
Clock
Reset
Set Flip−Flop Q
Dmax = 65%
Reset
Driver
VCC
7 GND
GND 3
FB 4
Error flag armed?
Overload?
0.5 V
−
+
Startup Sequence
Soft−Start Overload
+
-
Drain
5
DRAIN
Figure 2. Simplified Internal Circuit Architecture
MAXIMUM RATINGS
Symbol
Rating
Value
Unit
VCC Power Supply voltage on all pins, except pin 5 (drain)
Vds Drain voltage
−0.3 to 10
−0.3 to 700
V
V
Idspk
I_VCC
RqJL
RqJA
RRqqJJAL
Drain peak current during transformer saturation
Maximum current into pin 1
Thermal Characteristics
P Suffix, Case 626A
Junction−to−Lead
Junction−to−Air, 2.0 oz (70 mm) Printed Circuit Copper Clad
0.36 Sq. Inch (2.32 Sq. Cm)
1.0 Sq. Inch (6.45 Sq. Cm)
ST Suffix, Plastic Package Case 318E
Junction−to−Lead
Junction−to−Air, 2.0 oz (70 mm) Printed Circuit Copper Clad
0.36 Sq. Inch (2.32 Sq. Cm)
1.0 Sq. Inch (6.45 Sq. Cm)
1A
15 mA
°C/W
9.0
77
60
14
74
55
TJMAX
Maximum Junction Temperature
Storage Temperature Range
ESD Capability, Human Body Model (HBM) (All pins except HV)
150
−60 to +150
2
°C
°C
kV
ESD Capability, Machine Model (MM)
200 V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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