ON Semiconductor NCP1200 Technical data

NCP1200P60

NCP1200

PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies

Housed in SOIC−8 or PDIP−8 package, the NCP1200 represents a major leap toward ultra−compact Switchmode Power Supplies. Due to a novel concept, the circuit allows the implementation of a complete offline battery charger or a standby SMPS with few external components. Furthermore, an integrated output short−circuit protection lets the designer build an extremely low−cost AC−DC wall adapter associated with a simplified feedback scheme.

With an internal structure operating at a fixed 40 kHz, 60 kHz or 100 kHz, the controller drives low gate−charge switching devices like an IGBT or a MOSFET thus requiring a very small operating power. Due to current−mode control, the NCP1200 drastically simplifies the design of reliable and cheap offline converters with extremely low acoustic generation 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 skip cycle mode and provides excellent efficiency at light loads. Because this occurs at low peak current, no acoustic noise takes place.

Finally, the IC is self−supplied from the DC rail, eliminating the need of an auxiliary winding. This feature ensures operation in presence of low output voltage or shorts.

Features

•No Auxiliary Winding Operation

•Internal Output Short−Circuit Protection

•Extremely Low No−Load Standby Power

•Current−Mode with Skip−Cycle Capability

•Internal Leading Edge Blanking

•250 mA Peak Current Source/Sink Capability

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

•Direct Optocoupler Connection

•Built−in Frequency Jittering for Lower EMI

•SPICE Models Available for TRANsient and AC Analysis

•Internal Temperature Shutdown

•Pb−Free Packages are Available

Typical Applications

•AC−DC Adapters

•Offline Battery Chargers

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

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			MARKING
			DIAGRAMS
			8
		SOIC−8	200Dy
	8	D SUFFIX	ALYW
		CASE 751
	1		1
			8
		PDIP−8	1200Pxxx
		P SUFFIX
			AWL
		CASE 626
	8		YYWW
	1		1
	xxx = Device Code: 40, 60 or 100
	y	= Device Code:
		4 for 40
		6 for 60
		1 for 100
	A	= Assembly Location
	L	= Wafer Lot
	Y, YY	= Year

W, WW = Work Week

PIN CONNECTIONS

Adj				HV
	1		8
FB				NC
	2		7
CS				VCC
	3		6
GND				Drv
	4		5

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 14 of this data sheet.

Semiconductor Components Industries, LLC, 2004	1	Publication Order Number:
December, 2004 − Rev. 13		NCP1200/D

NCP1200

C3	+			*		+	6.5 V @ 600 mA
			HV		D2		C2
10 F				8
	1	Adj			1N5819
400 V	2			7			470 F/10 V
		FB	NC
	3	CS	VCC	6	M1	Rf
	4	GND Drv		5	MTD1N60E	470
EMI
Filter
				+
				C5	Rsense
			10 F			D8
Universal Input						5 V1

*Please refer to the application information section

Figure 1. Typical Application

PIN FUNCTION DESCRIPTION

Pin No.	Pin Name	Function	Description
1	Adj	Adjust the Skipping Peak Current	This pin lets you adjust the level at which the cycle skipping process takes
			place.
2	FB	Sets the Peak Current Setpoint	By connecting an Optocoupler to this pin, the peak current setpoint is ad-
			justed accordingly to the output power demand.
3	CS	Current Sense Input	This pin senses the primary current and routes it to the internal comparator
			via an L.E.B.
4	GND	The IC Ground
5	Drv	Driving Pulses	The driver's output to an external MOSFET.
6	VCC	Supplies the IC	This pin is connected to an external bulk capacitor of typically 10 F.
7	NC	No Connection	This un−connected 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
			the VCC bulk capacitor.

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NCP1200

Adj

1

HV Current

8

HV

Source

75.5 k

1.4 V

Skip Cycle

Comparator

+

Internal

UVLO

2

-

7

FB

High and Low

NC

VCC

Internal Regulator

29 k

Q Flip−Flop

Current 3

250 ns

40, 60 or

Set

DCmax = 80% Q

6

VCC

Sense

L.E.B.

100 kHz

Reset

Clock

8 k

60 k

+

4

-

5

Ground

Drv

+

Vref

20 k

1 V

±110 mA

- 5.2 V

Overload?

Fault Duration

Figure 2. Internal Circuit Architecture

MAXIMUM RATINGS

Rating	Symbol	Value	Units
Power Supply Voltage	VCC	16	V
Thermal Resistance Junction−to−Air, PDIP−8 version	R JA	100	°C/W
Thermal Resistance Junction−to−Air, SOIC version	R JA	178
Maximum Junction Temperature	TJmax	150	°C
Typical Temperature Shutdown	−	140
Storage Temperature Range	Tstg	−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)	−	30	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.

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NCP1200

ELECTRICAL CHARACTERISTICS (For typical values TJ = +25°C, for min/max values TJ = −25 °C to +125°C, Max TJ = 150°C, VCC= 11 V unless otherwise noted)

Rating	Pin	Symbol	Min	Typ	Max	Unit
DYNAMIC SELF−SUPPLY (All Frequency Versions, Otherwise Noted)
VCC Increasing Level at Which the Current Source Turns−off	6	VCCOFF	10.3	11.4	12.5	V
VCC Decreasing Level at Which the Current Source Turns−on	6	VCCON	8.8	9.8	11	V
VCC Decreasing Level at Which the Latchoff Phase Ends	6	VCClatch	−	6.3	−	V
Internal IC Consumption, No Output Load on Pin 5	6	ICC1	−	710	880	A
					Note 1
Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 40 kHz	6	ICC2	−	1.2	1.4	mA
					Note 2
Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 60 kHz	6	ICC2	−	1.4	1.6	mA
					Note 2
Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 100 kHz	6	ICC2	−	1.9	2.2	mA
					Note 2
Internal IC Consumption, Latchoff Phase	6	ICC3	−	350	−	A
INTERNAL CURRENT SOURCE
High−voltage Current Source, V CC = 10 V	8	IC1	2.8	4.0	−	mA
High−voltage Current Source, V CC = 0 V	8	IC2	−	4.9	−	mA
DRIVE OUTPUT
Output Voltage Rise−time @ CL = 1 nF, 10−90% of Output Signal	5	Tr	−	67	−	ns
Output Voltage Fall−time @ CL = 1 nF, 10−90% of Output Signal	5	Tf	−	28	−	ns
Source Resistance (drive = 0, Vgate = VCCHMAX − 1 V)	5	ROH	27	40	61
Sink Resistance (drive = 11 V, Vgate = 1 V)	5	ROL	5	12	25
CURRENT COMPARATOR (Pin 5 Un−loaded)
Input Bias Current @ 1 V Input Level on Pin 3	3	IIB	−	0.02	−	A
Maximum internal Current Setpoint	3	ILimit	0.8	0.9	1.0	V
Default Internal Current Setpoint for Skip Cycle Operation	3	ILskip	−	350	−	mV
Propagation Delay from Current Detection to Gate OFF State	3	TDEL	−	100	160	ns
Leading Edge Blanking Duration	3	TLEB	−	230	−	ns
INTERNAL OSCILLATOR (VCC = 11 V, Pin 5 Loaded by 1 k )
Oscillation Frequency, 40 kHz Version	−	fOSC	36	42	48	kHz
Oscillation Frequency, 60 kHz Version	−	fOSC	52	61	70	kHz
Oscillation Frequency, 100 kHz Version	−	fOSC	86	103	116	kHz
Built−in Frequency Jittering, F SW = 40 kHz	−	fjitter	−	300	−	Hz/V
Built−in Frequency Jittering, F SW = 60 kHz	−	fjitter	−	450	−	Hz/V
Built−in Frequency Jittering, F SW = 100 kHz	−	fjitter	−	620	−	Hz/V
Maximum Duty Cycle	−	Dmax	74	80	87	%
FEEDBACK SECTION (VCC = 11 V, Pin 5 Loaded by 1 k )
Internal Pullup Resistor	2	Rup	−	8.0	−	k
Pin 3 to Current Setpoint Division Ratio	−	Iratio	−	4.0	−	−
SKIP CYCLE GENERATION
Default skip mode level	1	Vskip	1.1	1.4	1.6	V
Pin 1 internal output impedance	1	Zout	−	25	−	k
1. Max value @ TJ = −25 °C.
2. Max value @ TJ = 25°C, please see characterization curves.

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NCP1200

	60							11.70
	50							11.60
( A)	40						(V)	11.50
	20							11.30
LEAKAGE							V
	30						CCOFF	11.40
	10							11.20
	0					100	125	11.10
	−25	0	25	50	75			−25

TEMPERATURE (°C)

Figure 3. HV Pin Leakage Current vs.

Temperature

100 kHz

60 kHz

40 kHz

0

25

50

75

100

125

TEMPERATURE (°C)

Figure 4. VCC OFF vs. Temperature

	9.85
	9.80
	9.75
(V)	9.70
CCON
	9.65
V	9.60
	9.55
	9.50
	9.45
	−25

		2.10
		1.90
	(mA)	1.70
		1.50
	CC2
	I
		1.30
		1.10
		0.90
		−25

		100 kHz					900
							850
		60 kHz
							800
						( A)	750
						CC1				100 kHz
		40 kHz				I
							700
							650	60 kHz
										40 kHz
0	25	50	75	100	125		600
							−25	0	25	50	75	100	125
	TEMPERATURE (°C)								TEMPERATURE (°C)

Figure 5. VCC ON vs. Temperature								Figure 6. ICC1 vs. Temperature
						110
		100 kHz				104
						98			100 kHz
						92
					(kHz)	86
						80
					SW	74
		60 kHz				68			60 kHz
					F
						62
		40 kHz				56
						50			40 kHz
						44
0	25	50	75	100	125	38
						−25	0	25	50	75	100	125
	TEMPERATURE (°C)							TEMPERATURE (°C)
	Figure 7. ICC2 vs. Temperature						Figure 8. Switching Frequency vs. TJ

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5

NCP1200

	6.50
	6.45
(V)	6.40
CCLATCHOFF
	6.35
V	6.30
	6.25
	6.20
	−25

	60
	50
	40
	30
	20
	10
	0
	−25

													460
													430
													400
												A)	370
													340
												(
												CC3	310
												I
													280
													250
													220
													190
0		25		50		75			100		125				0		25		50		75		100		125
													−25
		TEMPERATURE (°C)															TEMPERATURE (°C)
Figure 9. VCC Latchoff vs. Temperature																Figure 10. ICC3 vs. Temperature
													1.00
				Source								(V)	0.96
												SETPOINT
													0.92
												CURRENT
													0.84
													0.88
				Sink									0.80
0		25		50		75			100		125		−25		0		25		50		75		100		125
		TEMPERATURE (°C)															TEMPERATURE (°C)

Figure 11. DRV Source/Sink Resistances

Figure 12. Current Sense Limit vs. Temperature

Vskip (V)

1.34

1.33

1.32

1.31

1.30

1.29

1.28
−25	0	25	50	75	100	125

TEMPERATURE (°C)

DUTY−MAX (%)

86.0

84.0

82.0

80.0

78.0

76.0

74.0
−25	0	25	50	75	100	125

TEMPERATURE (°C)

Figure 13. Vskip vs. Temperature

Figure 14. Max Duty Cycle vs. Temperature

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