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NCP1230A
Low−Standby Power Soft
Skip Mode Controller
The NCP1230A represents a major leap towards achieving low
standby power in medium−to−high power Switched−Mode Power
Supplies such as notebook adapters, off−line battery chargers and
consumer electronics equipment. Housed in a compact 8−pin package
(SO−8 or PDIP−7), the NCP1230A contains all needed control
functionality to build a rugged and efficient power supply. The
NCP1230A is a current mode controller with internal ramp
compensation. Among the unique features offered by the NCP1230A
is an event management scheme that can disable the front−end PFC
circuit during standby, thus reducing the no load power consumption.
The NCP1230A itself goes into soft skipping at light loads while
limiting peak current (to 25% of nominal peak) so that no acoustic
noise is generated. The NCP1230A has a high−voltage startup circuit
that eliminates external components and reduces power consumption.
The NCP1230A also features an internal latching function that can
be used for OVP protection. This latch is triggered by pulling the CS
pin above 3.0 V and can only be reset by pulling V
CC
to ground. True
overload protection, internal 2.5 ms soft−start, internal leading edge
blanking, internal frequency dithering for low EMI are some of the
other important features offered by the NCP1230A.
Features
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MARKING
DIAGRAMS
8
SO−8 VHVIC
D SUFFIX
CASE 751
1
230Ay
ALYWy
G
8
1
PDIP−7 VHVIC
P SUFFIX
CASE 626B
8
1
xx
yy
A
W, WW
L
Y, YY
G
G
1
1230Axx
AWL
YYWWG
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Current−Mode Operation with Internal Ramp Compensation
Internal High−Voltage Startup Current Source for Loss Less Startup
Extremely Low No−Load Standby Power
Soft Skip Mode at Low Peak Currents (Skip−Cycle)
Direct Connection to PFC Controller for Improved No−Load Standby
Power
Internal 2.5 ms Soft−Start
Internal Leading Edge Blanking
Short−Circuit Protection Independent of Auxiliary Level
Internal Frequency Dithering for Improved EMI Signature
+500 mA/−800 mA Peak Current Drive Capability
Available in Three Frequency Options: 65 kHz, 100 kHz, and 133 kHz
Direct Optocoupler Connection
SPICE Models Available for TRANsient and AC Analysis
Pb−Free Packages are Available
= Device Code: 65, 100, 133
= Device Code: 65, 100, 133
= Assembly Location
= Work Week
= Wafer Lot
= Year
= Pb−Free Package
= Pb−Free Package
PIN CONNECTIONS
PFC Vcc
FB
CS
GND
1
8
HV
V
CC
DRV
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
Typical Applications
•
High Power AC−DC Adapters for Notebooks, etc.
•
Offline Battery Chargers
•
Set−Top Boxes Power Supplies, TV, Monitors, etc.
©
Semiconductor Components Industries, LLC, 2006
July, 2006
−
Rev. 6
1
Publication Order Number:
NCP1230A/D
NCP1230A
HV
+
PFC_V
CC
OVP
V
out
1
2
+
CBulk
3
4
8
7
6
5
1
2
3
4
8
7
6
5
OVP
Gnd
MC33262/33260
NCP1230A
Ramp Comp
Rsense
10 k
V
CC
Cap
Gnd
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin No.
1
Pin Name
PFC V
CC
Function
This pin provides
the bias voltage to
the PFC controller.
Feedback Signal
Current Sense
3
4
5
6
7
8
CS/OVP
GND
DRV
V
CC
NC
HV
IC Ground
Driver Output
V
CC
Input
−
High−Voltage
Pin Description
This pin is a direct connection to the V
CC
pin (Pin 6) via a low impedance switch. In
standby and during the startup sequence, the switch is open and the PFC V
CC
is
shut down. As soon as the aux. winding is stabilized, Pin 1 connects to the V
CC
pin
and provides bias to the PFC controller. It goes down in standby and fault conditions.
An optocoupler collector pulls this pin low to regulate. When the current setpoint
reaches 25% of the maximum peak, the controller skips cycles.
This pin incorporates three different functions: the current sense function, an internal
ramp compensation signal and a 3.0 V latch−off level which latches the output off
until V
CC
is recycled.
−
With a drive capability of +500 mA /
−800
mA, the NCP1230A can drive large Qg
MOSFETs.
The controller accepts voltages up to 18 V and features a UVLO turn−off threshold of
7.7 V typical.
−
This pin connects to the bulk voltage and offers a lossless startup sequence. The
charging current is high enough to support the bias needs of a PWM controller
through Pin 1.
2
FB
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2
SW1
HV
8
1
PFC_Vcc
3.2 mAdc
/2
+
−
4Vcomp
+
Skip
0.75 Vdc
Vccreset
−
Thermal
Shutdown
4.0 Vdc
Vcc Mgmt
Vccoff=12.6V
Vccmin=7.7V
Vcclatch=5.6V
PFC_Vcc
−
PFC_Vcc
1.25 Vdc
Fault
+
VCC
Internal
Bias
20 V
125 msec
Timer
6
Vdd
Vdd
Error
R
S
PWM
−
+
+
−
Frequency
Modulation
Soft−Start Ramp (1V max)
2.5 msec
SS Timer
OSC
2.3 Vpp
Ramp
Latch−Off
+
−
3.0 Vdc
R
S
Q
Q
DRV
5
20k
NCP1230A
Figure 2. Internal Circuit Architecture
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3
2
FB
55k
10 V
25k
18 k
3
CS
LEB
10 V
4
GND
NCP1230A
MAXIMUM RATINGS
(Notes 1 and 2)
Rating
Maximum Voltage on Pin 8
Maximum Current
Power Supply Voltage, Pin 6
Current
Drive Output Voltage, Pin 5
Drive Current
Voltage Current Sense Pin, Pin 3
Current
Voltage Feedback, Pin 2
Current
Voltage, Pin 1
Maximum Continuous Current Flowing from Pin 1
Thermal Resistance, Junction−to−Air, PDIP Version
Thermal Resistance, Junction−to−Air, SOIC Version
Maximum Power Dissipation @ T
A
= 25°C
Maximum Junction Temperature
Storage Temperature Range
PDIP
SOIC
Symbol
V
DS
I
C2
V
CC
I
CC2
V
DV
I
o
V
cs
I
cs
V
fb
I
fb
V
PFC
I
PFC
R
qJA
R
qJA
P
max
T
J
T
stg
Value
−0.3
to 500
100
−0.3
to 18
100
18
1.0
10
100
10
100
18
35
100
178
1.25
0.702
150
−60
to +150
Unit
V
mA
V
mA
V
A
V
mA
V
mA
V
mA
°C/W
°C/W
W
°C
°C
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.
1. This device series contains ESD protection and exceeds the following tests:
Pin 1−6: Human Body Model 2000 V per Mil−Std−883, Method 3015.
Machine Model Method 200 V
Pin 8 is the HV startup of the device and is rated to the maximum rating of the part, or 500 V.
2. This device contains latchup protection and exceeds 100 mA per JEDEC Standard JESD78.
ORDERING INFORMATION
Device Order Number
NCP1230AD65R2
NCP1230AD65R2G
NCP1230AD100R2
NCP1230AD100R2G
NCP1230AD133R2
NCP1230AD133R2G
NCP1230AP65
NCP1230AP65G
NCP1230AP100
NCP1230AP100G
NCP1230AP133
NCP1230AP133G
Package Type
SO−8
SO−8
(Pb−Free)
SO−8
SO−8
(Pb−Free)
SO−8
SO−8
(Pb−Free)
PDIP−7
PDIP−7
(Pb−Free)
PDIP−7
PDIP−7
(Pb−Free)
PDIP−7
PDIP−7
(Pb−Free)
Tape and Reel Size
†
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
2500 / Tape & Reel
50 Units / Rail
50 Units / Rail
50 Units / Rail
50 Units / Rail
50 Units / Rail
50 Units / Rail
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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4
