NCP1075A/B, NCP1076A/B,
NCP1077A/B, NCP1079A/B
Enhanced Off-line Switcher
for Robust and Highly
Efficient Power Supplies
The NCP107xuz products integrate a fixed frequency current mode
controller with a 700 V MOSFET. Available in a two different pin−out
of the very common PDIP−7 package, the NCP107xuz offers a high
level of integration, including soft−start, frequency−jittering,
short−circuit protection, skip−cycle, a maximum peak current
set−point, ramp compensation, and a dynamic self−supply (DSS,
eliminating the need for an auxiliary winding).
Unlike other monolithic solutions, the NCP107xuz is quiet by
nature: during nominal load operation, the part switches at one of the
available frequencies (65, 100 or 130 kHz). When the output power
demand diminishes, the IC automatically enters frequency foldback
mode and provides excellent efficiency at light loads. When the power
demand reduces further, it enters into a skip mode to reduce the
standby consumption down to a no load condition.
Protection features include: a timer to detect an overload or a
short−circuit event, Over−voltage Protection with auto−recovery. Ac
input line voltage detection prevents lethal runaway in low input
voltage conditions (Brown−out) as well as too high an input line (Ac
line Over−voltage Protection). This also allows an Over−power
Protection to compensate all internal delays in high input voltage
conditions and optimize the maximum output current capability.
For improved standby performance, the connection of an auxiliary
winding stops the DSS operation and helps to reduce input power
consumption below 50 mW at high line.
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MARKING
DIAGRAMS
P107xPuzy
AWL
YYWWG
PDIP−7
(PDIP−8 LESS PIN 6)
CASE 626A
PDIP−7
(PDIP−8 LESS PIN 3)
CASE 626AS
x
u
z
y
A
WL
Y, YY
W, WW
G
P107xPuzy
AWL
YYWWG
= Power Version (5, 6, 7, 9)
= Pin Connections (A, B)
= 2nd level OCP enabled/disabled (A, B)
= Oscillator Frequency 65, 100, 130 (A, B, C)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
Features
See detailed ordering and shipping information on page 31 of
this data sheet.
•
Built−in 700 V MOSFET with R
DS(ON)
of 13.5
W
•
•
•
•
•
•
•
•
•
(NCP1075uz), 4.8
W
(NCP1076uz/77uz) and 2.9
W
(NCP1079uz)
Large Creepage Distance Between High Voltage Pins
Current−mode Fixed Frequency Operation –
65 / 100 / 130 kHz
Various Options for Maximum Peak Current: see below
table
Fixed Slope Compensation
Skip−cycle Operation at Low Peak Currents Only
Dynamic Self−supply: No Need for an Auxiliary
Winding
Internal 10 ms Soft−start
Auto−recovery Output Short−circuit Protection with
Timer−based Detection
Auto−recovery Over−voltage Protection with Auxiliary
Winding Operation
•
Adjustable Brown−out Protection and OVP
•
2
nd
Leading Edge Blanking – Current Protection
•
•
•
•
•
•
•
•
•
(NCP107xuA version only)
Over Power Protection
Frequency Jittering for Better EMI Signature
No Load Input Consumption < 50 mW
Frequency Foldback to Improve Efficiency at Light
Load
These are Pb−free Devices
Typical Applications
Auxiliary / Standby Isolated Power Supplies
Major Home Appliances Power Supplies
Power Meter SMPS
Wide Input Industrial SMPS
©
Semiconductor Components Industries, LLC, 2017
1
September, 2018 − Rev. 3
Publication Order Number:
NCP1076A/D
NCP1075A/B, NCP1076A/B, NCP1077A/B, NCP1079A/B
PIN CONNECTIONS
VCC
BO/AC_OVP
GND
FB
(Top View)
PDIP−7
NCP107xA
DRAIN
DRAIN
(Top View)
PDIP−7
NCP107xB
GND
GND
FB
VCC
BO/AC_OVP
GND
GND
GND
PIN FUNCTION DESCRIPTION
Pin No
PDIP 7 A
1
PDIP 7 B
2
Pin Name
VCC
Function
IC supply pin
Pin Description
This pin is connected to an external capacitor.
The V
CC
management includes an auto−recov-
ery over−voltage protection.
Detects both input voltage conditions (Brown−
out) and too high an input voltage (Ac line OVP).
Do not leave this pin floating – if this pin is not
used it should be directly connected do GND.
2
8
BO/AC_OVP
Brown−out / Ac Line
Over−voltage protection
3
4
5
1
GND
FB
The IC Ground
Feedback signal input
By connecting an opto−coupler to this pin, the
peak current set−point is adjusted accordingly to
the output power demand.
The internal drain MOSFET connection
This un−connected pin ensures adequate creep-
age distance
The IC Ground
The IC Ground
5
6
7
8
4
3
6
7
DRAIN
NC
GND
GND
Drain connection
PRODUCTS INFOS & INDICATIVE MAXIMUM OUTPUT POWER
230 Vrms
+15%
Product
NCP1075uz
NCP1076uz / NCP1077uz
NCP1079uz
NOTE:
R
DS(ON)
13.5
W
4.8
W
2.9
W
I
PK
400 mA
800 mA
1050 mA
Adapter
8.5 W
19 W
25 W
Open Frame
14 W
31 W
41 W
85−265 Vrms
Adapter
6W
14 W
18 W
Open Frame
10 W
23 W
30 W
Informative values only, with T
amb
= 25°C, T
case
= 100°C, PDIP−7 package, Self−supply via Auxiliary winding and circuit mounted
on minimum copper area as recommended.
QUICK SELECTION TABLE
Device
NCP1075uz
NCP1076uz
NCP1077uz
NCP1079uz
Frequency [kHz]
65, 100, 130*
65, 100, 130*
65, 100, 130*
65, 100, 130*
R
DS(ON)
[W]
13.5
4.8
4.8
2.9
I
PK
[mA]
400
650
800
1050
PDIP−7
(Pb−Free)
Package type
*NOTE: 130 kHz option available in pin connection B only
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2
NCP1075A/B, NCP1076A/B, NCP1077A/B, NCP1079A/B
MAXIMUM RATINGS
TABLE
(All voltages related to GND terminal)
Rating
Power supply voltage, VCC pin, continuous voltage
Voltage on all pins, except DRAIN and VCC pin
DRAIN voltage
Maximum Current into VCC pin
Drain Current Peak during Transformer Saturation (T
J
= 150°C):
NCP1075uz
NCP1076uz/77uz
NCP1079uz
Drain Current Peak during Transformer Saturation (T
J
= 25°C):
NCP1075uz
NCP1076uz/77uz
NCP1079uz
Thermal Resistance Junction−to−Air – PDIP7
0.36 Sq. Inch
1.0 Sq. Inch
Maximum Junction Temperature
Storage Temperature Range
Human Body Model ESD Capability (All pins except HV pin) per JEDEC JESD22−A114F
Human Body Model ESD Capability (Drain pin) per JEDEC JESD22−A114F
Charged−Device Model ESD Capability per JEDEC JESD22−C101E
Machine Model ESD Capability per JEDEC JESD22−A115−A
HBM
HBM
CDM
MM
T
JMAX
R
θJ−A
Symbol
V
CC
Vinmax
BV
DSS
I
CC
I
DS(PK)
0.9
2.2
3.6
Value
−0.3 to 20
−0.3 to 10
−0.3 to 700
15
Unit
V
V
V
mA
A
1.5
3.9
6.4
77
68
150
−60 to +150
2
1
1
200
°C
°C
kV
kV
kV
V
°C/W
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.
2. Maximum drain current I
DS(PK)
is obtained when the transformer saturates. It should not be mixed with short pulses that can be seen at turn
on. Figure 4 below provides spike limits the device can tolerate.
i
D
(t)
<
1.5 x
I
DS(PK)
< t
LEB
I
DS(PK)
Transformer
Saturation
t
Figure 4. Spike Limits
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