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NCP1203
PWM Current-Mode
Controller for Universal
Off-Line Supplies Featuring
Standby and Short Circuit
Protection
Housed in SOIC-8 or PDIP-8 package, the NCP1203 represents a
major leap toward ultra-compact Switchmode Power Supplies and
represents an excellent candidate to replace the UC384X devices. Due
to its proprietary SMARTMOSt Very High Voltage Technology, the
circuit allows the implementation of complete off-line AC-DC
adapters, battery charger and a high-power SMPS with few external
components.
With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz switching frequency, the controller features a high-voltage
startup FET which ensures a clean and loss-less startup sequence. Its
current-mode control naturally provides good audio-susceptibility
and inherent pulse-by-pulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the so-called
skip cycle mode and provides improved efficiency at light loads
while offering excellent performance in standby conditions. Because
this occurs at a user adjustable low peak current, no acoustic noise
takes place.
The NCP1203 also includes an efficient protective circuitry which,
in presence of an output over load condition, disables the output
pulses while the device enters a safe burst mode, trying to restart.
Once the default has gone, the device auto-recovers. Finally, a
temperature shutdown with hysteresis helps building safe and robust
power supplies.
Features
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MARKING
DIAGRAM
8
8
1
SOIC-8
D1, D2 SUFFIX
CASE 751
1
x
A
L
Y
W
G
= 4, 6, or 1
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-Free Package
203Dx
ALYW
G
8
PDIP-8
N SUFFIX
CASE 626
1
xx
A
WL
YY
WW
G
1
= 40, 60, or 100
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-Free Package
1203Pxx
AWL
YYWWG
8
•
•
•
•
•
•
•
•
•
•
•
•
High-Voltage Startup Current Source
Auto-Recovery Internal Output Short-Circuit Protection
Extremely Low No-Load Standby Power
Current-Mode with Adjustable Skip-Cycle Capability
Internal Leading Edge Blanking
250 mA Peak Current Capability
Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
Direct Optocoupler Connection
Undervoltage Lockout at 7.8 V Typical
SPICE Models Available for TRANsient and AC Analysis
Pin to Pin Compatible with NCP1200
Pb-Free Packages are Available
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
(Top View)
8 HV
7 NC
6 V
CC
5 Drv
Applications
•
AC-DC Adapters for Notebooks, etc.
•
Offline Battery Chargers
•
Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
©
Semiconductor Components Industries, LLC, 2007
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
1
November, 2007- Rev. 9
Publication Order Number:
NCP1203/D
NCP1203
*
+
NCP1203
1
2
EMI
FILTER
UNIVERSAL
INPUT
3
4
Adj
FB
CS V
CC
GND Drv
HV
8
7
6
5
Aux.
+
V
OUT
+
*Please refer to the application information section
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin No.
1
Pin Name
Adj
Function
Adjust the skipping peak current
Pin Description
This pin lets you adjust the level at which the cycle skipping process takes
place. Shorting this pin to ground, permanently disables the skip cycle
feature.
By connecting an optocoupler to this pin, the peak current setpoint is
adjusted accordingly to the output power demand. Skip cycle occurs when
FB falls below Vpin1.
This pin senses the primary current and routes it to the internal comparator
via an L.E.B.
-
The driver's output to an external MOSFET.
This pin is connected to an external bulk capacitor of typically 22
mF.
This unconnected pin ensures adequate creepage distance.
Connected to the high-voltage rail, this pin injects a constant current into
the V
CC
capacitor during the startup sequence.
2
FB
Sets the peak current setpoint
3
4
5
6
7
8
CS
GND
Drv
V
CC
NC
HV
Current sense input
The IC ground
Driving pulses
Supplies the IC
-
Ensure a clean and lossless
startup sequence
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2
NCP1203
Adj
1
HV CURRENT
SOURCE
80 k
SKIP CYCLE
COMPARATOR
INTERNAL V
CC
24 k
CURRENT
SENSE
3
250 ns
L.E.B.
40-60-100 kHz
CLOCK
SET
Q FLIP-FLOP
DCmax = 80%
RESET
UVLO HIGH AND LOW
INTERNAL REGULATOR
HV
8
FB
2
1.2 V
+
-
NC
7
V
CC
Q
OVERLOAD
MANAGEMENT
6
20 k
GROUND
4
+
-
V
REF
57 k
+
-
Drv
1V
±250
mA
5
25 k
Figure 2. Internal Circuit Architecture
MAXIMUM RATINGS
Rating
Power Supply Voltage
Power Supply Voltage on all other pins except Pin 5 (Drv), Pin 6 (V
CC
) and Pin 8 (HV)
Maximum Current into all pins except Pin 6 (V
CC
) and Pin 8 (HV) when
10 V ESD diodes are activated
Thermal Resistance, Junction-to-Air, PDIP-8 Version
Thermal Resistance, Junction-to-Air, SOIC Version
Thermal Resistance, Junction-to-Case
Maximum Junction Temperature
Temperature Shutdown
Hysteresis in Shutdown
Operating Temperature Range
Storage Temperature Range
ESD Capability, HBM Model, All pins except Pin 6 (V
CC
) and Pin 8 (HV)
ESD Capability, Machine Model
Maximum Voltage on Pin 8 (HV) with Pin 6 (V
CC
) Decoupled to Ground with 10
mF
Symbol
V
CC
, Drv
-
-
Value
16
-0.3 to 10
5.0
100
178
57
150
170
30
-40 to +125
-60 to +150
2.0
200
500
Unit
V
V
mA
°C/W
R
qJA
R
qJA
R
qJC
TJ
MAX
-
-
T
J
T
stg
-
-
-
°C
°C
°C
°C
°C
kV
V
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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3
NCP1203
ELECTRICAL CHARACTERISTICS
(For typical values T
J
= 25°C, for min/max values T
J
= 0°C to +125°C, Max T
J
= 150°C,
V
CC
= 11 V unless otherwise noted.)
Characteristic
Supply Section
(All frequency versions, otherwise noted)
Turn-on Threshold Level, V
CC
Going Up
Minimum Operating Voltage after Turn-on
V
CC
Decreasing Level at which the Latchoff Phase Ends
Internal IC Consumption, No Output Load on Pin 5
Internal IC Consumption, 1.0 nF Output Load on Pin 5,
F
SW
= 40 kHz
Internal IC Consumption, 1.0 nF Output Load on Pin 5,
F
SW
= 60 kHz
Internal IC Consumption, 1.0 nF Output Load on Pin 5,
F
SW
= 100 kHz
Internal IC Consumption, Latch-off Phase, V
CC
= 6.0 V
Internal Startup Current Source
(Pin 8 biased at 50 V)
High-Voltage Current Source, V
CC
= 10 V
High-Voltage Current Source, V
CC
= 0
Drive Output
Output Voltage Rise-Time @ CL = 1.0 nF, 10-90% of
Output Signal
Output Voltage Fall-Time @ CL = 1.0 nF, 10-90% of
Output Signal
Source Resistance
Sink Resistance
Current Comparator
(Pin 5 loaded unless otherwise noted)
Input Bias Current @ 1.0 V Input Level on Pin 3
Maximum Internal Current Setpoint (Note 3)
Default Internal Current Setpoint for Skip Cycle Operation
Propagation Delay from Current Detection to Gate OFF
State
Leading Edge Blanking Duration (Note 3)
Internal Oscillator
(V
CC
= 11 V, Pin 5 loaded by 1 nF)
Oscillation Frequency, 40 kHz Version
Oscillation Frequency, 60 kHz Version
Oscillation Frequency, 100 kHz Version
Maximum Duty-Cycle
Feedback Section
(V
CC
= 11 V, Pin 5 unloaded)
Internal Pullup Resistor
Pin 3 to Current Setpoint Division Ratio
Skip Cycle Generation
Default Skip Mode Level
Pin 1 Internal Output Impedance
Vskip
Zout
1
1
1.0
-
1.2
22
1.4
-
V
kW
Rup
Iratio
2
-
-
-
20
3.3
-
-
kW
-
f
OSC
f
OSC
f
OSC
Dmax
-
-
-
-
37
57
90
74
42
65
103
80
47
73
115
87
kHz
kHz
kHz
%
I
IB
I
Limit
I
Lskip
T
DEL
T
LEB
3
3
3
3
3
-
0.85
-
-
-
0.02
0.92
360
90
230
-
1.0
-
160
-
mA
V
mV
ns
ns
T
r
T
f
R
OH
R
OL
5
5
5
5
-
-
27
5.0
67
28
40
10
-
-
61
20
ns
ns
W
W
IC1
IC2
8
8
3.5
-
6.0
11
9.0
-
mA
mA
V
CC(on)
V
CC(min)
V
CClatch
ICC1
ICC2
ICC2
ICC2
ICC3
6
6
6
6
6
6
6
6
12.2
7.2
-
-
-
-
-
-
12.8
7.8
4.9
750
1.2
1.4
2.0
250
14
8.4
-
880
(Note 1)
1.4
(Note 2)
1.6
(Note 2)
2.2
(Note 2)
-
V
V
V
mA
mA
mA
mA
mA
Symbol
Pin
Min
Typ
Max
Unit
1. Max value at T
J
= 0°C.
2. Maximum value @ T
J
= 25°C, please see characterization curves.
3. Pin 5 loaded by 1 nF.
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