ON Semiconductor NCP1200A Technical data

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NCP1200A

PWM Current−Mode
Controller for Universal
Off−Line Supplies Featuring
Low Standby Power

Housed in SOIC−8 or PDIP−8 package, the NCP1200A enhances
the previous NCP1200 series by offering a reduced optocoupler
current together with an increased drive capability. Due to its novel
concept, the circuit allows the implementation of complete off−line
AC−DC adapters, battery charger or a SMPS where standby power is a
key parameter.

With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz, the controller supplies itself from the high−voltage rail,
avoiding the need of an auxiliary winding. This feature naturally eases
the designer task in battery charger applications. Finally,
current−mode control provides an excellent 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 excellent efficiency at light loads.
Because this occurs at a user adjustable low peak current, no acoustic
noise takes place.

The NCP1200A features an efficient protective circuitry which, in
presence of an overcurrent 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.

Features

• Pb−Free Packages are A vailable

• No Auxiliary Winding Operation

• Auto−Recovery Internal Output Short−Circuit Protection

• Extremely Low No−Load Standby Power

• Current−Mode Control with Skip−Cycle Capability

• Internal Temperature Shutdown

• Internal Leading Edge Blanking

• 250 mA Peak Current Capability

• Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz

• Direct Optocoupler Connection

• SPICE Models A vailable for TRANsient and AC Analysis

• Pin to Pin Compatible with NCP1200

T ypical Applications

• AC−DC Adapters for Portable Devices

• Offline Battery Chargers

• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

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MINIATURE PWM

CONTROLLER FOR HIGH

POWER AC−DC W ALL

ADAPTERS AND OFFLINE

BATTERY CHARGERS

MARKING

DIAGRAMS

8

1

HV

8

NC

7

V

6

Drv

5

8

200Ay
ALYW

1

1200APxxx

CC

SOIC−8

8

1

8

1

xxx = Specific Device Code

y = Specific Device Code

A = Assembly Location
WL, L = Wafer Lot
Y, YY = Year
W, WW = Work Week

GND

D SUFFIX

CASE 751

PDIP−8

P SUFFIX

CASE 626

(40, 60 or 100)

(4 for 40, 6 for 60, 1 for 100)

PIN CONNECTIONS

Adj

1

FB

2

CS

3
4

(Top View)

AWL

YYWW

 Semiconductor Components Industries, LLC, 2004

October, 2004− Rev. 5

ORDERING INFORMATION

See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.

1 Publication Order Number:

NCP1200A/D

NCP1200A

EMI

FILTER

UNIVERSAL

INPUT

*Please refer to the application information section

PIN FUNCTION DESCRIPTION

*

+

NCP1200A

Adj
FB
CS

GND

V

Drv

HV

CC

8
7
6
5

+

1
2
3
4

Figure 1. Typical Application Example

V

+

OUT

Pin No. Pin Name Function Pin Description

1 Adj Adjust the skipping peak current This pin lets you adjust the level at which the cycle skipping process takes

2 FB Sets the peak current setpoint By connecting an optocoupler to this pin, the peak current setpoint is

3 CS Current sense input This pin senses the primary current and routes it to the internal comparator

4 GND The IC ground −
5 Drv Driving pulses The driver’s output to an external MOSFET.
6 V
7 NC − This unconnected pin ensures adequate creepage distance.
8 HV Generates the VCC from the line Connected to the high−voltage rail, this pin injects a constant current into

CC

Supplies the IC This pin is connected to an external bulk capacitor of typically 10 F.

place. Shorting this pin to ground, permanently disables the skip cycle
feature.

adjusted accordingly to the output power demand.

via an L.E.B.

the V

bulk capacitor.

CC

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2

NCP1200A

Adj

FB

CURRENT

SENSE

GROUND

HV

1

8

HV CURRENT
SOURCE

80 k

1.2 V

2

SKIP CYCLE
COMPARATOR

+

−

INTERNAL V

UVLO HIGH AND LOW

INTERNAL REGULATOR

CC

NC
7

24 k

Q FLIP−FLOP
DCmax = 80%

3

250 ns

L.E.B.

40−60−100 kHz

CLOCK

20 k 57 k

V

4

REF

+

−

5 V

25 k

1 V

SET

RESET

+

−

OVERLOAD?

Q

±250 mA

V
6

Drv
5

CC

FAULT DURATION

Figure 2. Internal Circuit Architecture

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V
Thermal Resistance Junction−to−Air, PDIP−8 Version

Thermal Resistance Junction−to−Air, SOIC Version
Maximum Junction Temperature T

CC

R



JA

R



JA

J(max)

Temperature Shutdown − 145 °C
Storage Temperature Range − −60 to +150 °C
ESD Capability, HBM Model (All pins except VCC and HV) − 2.0 kV
ESD Capability, Machine Model − 200 V
Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) Grounded − 450 V
Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) Decoupled to Ground with 10 F − 500 V
Minimum Operating Voltage on Pin 8 (HV) − 40 V

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.

16 V

100
178

°C/W
°C/W

150 °C

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NCP1200A

ELECTRICAL CHARACTERISTICS (For typical values T

V

= 11 V unless otherwise noted.)

CC

Characteristic

= 25°C, for min/max values TJ = 0°C to +125°C, Max TJ = 150°C,

J

Symbol Pin Min Typ Max Unit

Dynamic Self−Supply (All frequency versions, otherwise noted)

V

Increasing Level at which the Current Source Turns−Off V

CC

VCC Decreasing Level at which the Current Source Turns−On V
VCC Decreasing Level at which the Latchoff Phase Ends V

CC(off)
CC(on)

CC(latch)

6 11.2 12.1 13.1 V
6 9.0 10 11 V
6 − 5.4 − V

Internal IC Consumption, No Output Load on Pin 5 ICC1 6 − 750 1000

(Note 1)

Internal IC Consumption, 1.0 nF Output Load on Pin 5, F

= 40 kHz ICC2 6 − 1.2 1.4

SW

(Note 2)

Internal IC Consumption, 1.0 nF Output Load on Pin 5, F

= 60 kHz ICC2 6 − 1.4 1.6

SW

(Note 2)

Internal IC Consumption, 1.0 nF Output Load on Pin 5, F

= 100 kHz ICC2 6 − 1.9 2.2

SW

(Note 2)

Internal IC Consumption, Latchoff Phase ICC3 6 − 350 − A

Internal Startup Current Source (TJ > 0°C, pin 8 biased at 50 V)

High−Voltage Current Source, V

= 10 V IC1 8 4.0 7.0 − mA

CC

High−Voltage Current Source, VCC = 0 IC2 8 − 13 − mA

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 T
Source Resistance R
Sink Resistance R

T

OH
OL

r
f

5 − 67 − ns
5 − 25 − ns
5 27 40 61 
5 5.0 10 21 

Current Comparator (Pin 5 unloaded unless otherwise noted)

Input Bias Current @ 1.0 V Input Level on Pin 3
Maximum Internal Current Setpoint (Note 3) I
Default Internal Current Setpoint for Skip Cycle Operation I
Propagation Delay from Current Detection to Gate OFF State T
Leading Edge Blanking Duration (Note 3) T

I

IB

Limit

Lskip

DEL

LEB

3 − 0.02 − A
3 0.8 0.9 1.0 V
3 − 360 − mV
3 − 90 160 ns
3 − 250 − ns

Internal Oscillator (VCC = 11 V, pin 5 loaded by 1.0 k)

Oscillation Frequency, 40 kHz Version
Built−in Frequency Jittering, fsw = 40 kHz f
Oscillation Frequency, 60 kHz Version f
Built−in Frequency Jittering, fsw = 60 kHz f
Oscillation Frequency, 100 kHz Version f
Built−in Frequency Jittering, fsw = 100 kHz f

f

OSC

jitter

OSC

jitter

OSC

jitter

− 37 43 48 kHz

− − 350 − kHz

− 53 61 68 kHz

− − 460 − kHz

− 90 103 114 kHz

− − 620 − kHz

Maximum Duty Cycle Dmax − 74 83 87 %

Feedback Section (VCC = 11 V, pin 5 unloaded)

Internal Pullup Resistor
Pin 3 to Current Setpoint Division Ratio I

R

ratio

up

2 − 20 − k

− − 3.3 − −

Skip Cycle Generation

Default Skip Mode Level
Pin 1 Internal Output Impedance Z

1. Max value at T

2. Maximum value @ T

3. Pin 5 loaded by 1.0 nF.

= 0°C.

J

= 25°C, please see characterization curves.

J

V

skip

out

1 0.95 1.2 1.45 V
1 − 22 − k

A

mA

mA

mA

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NCP1200A

5

TYPICAL CHARACTERISTICS

70

60

50

40

30

LEAKAGE (A)

20

10

0

−25 0 25 50 75 100 125
TEMPERATURE (°C)

Figure 3. HV Pin Leakage Current vs. Temperature

10.2

10.1

10.0

, (V)

9.9

CC(on)

V

9.8

9.7

12.5

12.3

12.1

11.9

11.7

, THRESHOLD (V)

11.5

CC(off)

V

11.3

11.1

−25 0 25 50 75 100 125
TEMPERATURE (°C)

Figure 4. V

900

850

800

750

ICC1 (A)

700

40 kHz

650

vs. Temperature

CC(off)

100 kHz

60 kHz

9.6

−25 0 25 50 75 100 125
TEMPERATURE (°C)

Figure 5. V

2.10

1.90

1.70

1.50

ICC2 (mA)

1.30

1.10

0.90

−25 0 25 50 75 100 125
TEMPERATURE (°C)

vs. Temperature

CC(on)

100 kHz

60 kHz

40 kHz

Figure 7. ICC2 vs. Temperature

600

−25 0 25 50 75 100 125
TEMPERATURE (°C)

Figure 6. ICC1 vs. Temperature

110
104

98
92
86
80

(kHz)

74

SW

68

F

62
56
50
44
38

−25 0 25 50 75 100 12

100 kHz

60 kHz

40 kHz

TEMPERATURE (°C)

Figure 8. Switching Frequency vs. Temperature

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