ON Semiconductor NCP1027 Technical data

NCP1027

High-Voltage Switcher
for Medium Power Offline
SMPS Featuring Low
Standby Power

The NCP1027 offers a new solution targeting output power levels
from a few watts up to 15 W in a universal mains flyback application.
Our proprietary high- voltage technology lets us include a power
MOSFET together with a startup current source, all directly
connected to the bulk capacitor. To prevent lethal runaway in low
input voltage conditions, an adjustable brown- out circuitry blocks
the activity until sufficient input level is reached.

Current- mode operation together with an adjustable ramp
compensation offers superior performance in universal mains
applications. Furthermore, an Over Power Protection pin brings the
ability to precisely compensate all internal delays in high input voltage
conditions and optimize the maximum output current capability.

Protection wise, a timer detects an overload or a short- circuit and
stops all operations, ensuring a safe auto- recovery, low duty cycle burst
operation. An integrated, auto- recovery, Overvoltage Protection
permanently monitors the VCC level and temporarily shuts down the
driving pulses in case of an unexpected feedback loop runaway.

Finally, a great R
for standby/auxiliary offline power supplies or applications requiring
higher output power levels.

Features

•Built-in 700 V MOSFET with Typical R

•Current-Mode Fixed Frequency Operation: 65 kHz and 100 kHz

•Fixed Peak Current of 800 mA

•Skip-Cycle Operation at Low Peak Currents

•Internal Current Source for Clean and Lossless Startup Sequence

•Auto-Recovery Output Short Circuit Protection with Timer-Based

Detection

•Auto-Recovery Overvoltage Protection with Auxiliary Winding

Operation

•Programmable Brown-Out Input for Low Input Voltage Detection

•Programmable Over Power Protection

•Input to Permanently Latchoff the Part

•Internal Frequency Jittering for Improved EMI Signature

•Extended Duty Cycle Operation to 80% Typical

•No-Load Input Standby Power of 85 mW @ 265 Vac

•500 mW Loaded, Input Power of 715 mW @ 230 Vac

•These are Pb-Free Devices

figure makes the circuit an excellent choice

DS(on)

of 5.8 W, TJ = 25°C

DS(on)

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MARKING
DIAGRAM

8-LEAD PDIP

P SUFFIX

CASE 626A

XXX = 65 or 100
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb-Free Package

PIN CONNECTIONS

V

CC

Ramp Comp.

Brown-Out

FB

(Top View)

ORDERING INFORMATION

Device Package Shipping*

NCP1027P065G PDIP-8

(Pb-Free)

NCP1027P100G PDIP-8

(Pb-Free)

*For additional information on our Pb-Free strategy

and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.

P1027PXXX

AWL

YYWWG

GND

OPP

Drain

50 Units / Rail

50 Units / Rail

Typical Applications

•Medium Power AC-DC Adapters for Chargers

•Auxiliary/Standby Power Supplies for ATX and TVS Power Supplies

Reference 230 VAC 90-265 VAC

NCP1027 - 5.8 W 25 W* 15 W*

*Typical values, open-frame, 65 kHz version, R

© Semiconductor Components Industries, LLC, 2007

May, 2007 - Rev. 4

< 75°C/W, TA = 50°C.

q

JA

1 Publication Order Number:

NCP1027/D

NCP1027

V

out

OPP*

NCP1027

1

2

3

4

8

7

5

85-265 VAC

*Optional component

OVP

+

BO

+

Ramp

Comp.*

+

Figure 1. Typical Application

PIN FUNCTION DESCRIPTION

Pin No. Symbol Function Description

1 V

2 Ramp Comp. Ramp Compensation

3 Brown-Out Brown-Out and

4 FB Feedback Signal Input By connecting an optocoupler to this pin, the peak current setpoint is adjusted

5 Drain Drain Connection The internal drain power switch circuit connection.

- - - This unconnected pin ensures adequate creepage distance.

7 OPP Over Power Protection Driving this pin reduces the power supply capability in high line conditions. If

8 GND The IC Ground -

CC

Powers the Internal

Circuitry

in CCM

Latchoff Input

This pin is connected to an external capacitor of typically 22 mF. The V
includes an active shunt which serves as an auto-recovery overvoltage
protection.

To extend the duty cycle operation in Continuous Conduction Mode (CCM),
pin 3 offers the ability to inject ramp compensation in the controller. If unused,
short this pin to VCC.

By monitoring the bulk level via a resistive network, the circuit protects itself
from low mains conditions. If an external event brings this pin above 4.0 V,
the part fully latches off.

accordingly to the output power demand.

no Over Power Protection is needed, short this pin to ground.

+

GND

CC

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2

V

BO

CC

Vclamp

Auto-Recovery OVP

+

Vlatch

IBO

+

VBO

20 ms RC

+

-

VCC < 4 V

Reset

+

-

+

S

Q
Q

R

NCP1027

+

-

50 ms RC

IC1

V

CC

Mngt
Fault

Timer

LEB

UVLOs

4 V rst
V

DD

GND

OPP

Ramp

Comp.

FB

Jittering

Icomp

+

V

25%
of lp

V

dd

dd

RFB

65 kHz or

100 kHz

CLOCK

Skip

+

-

Ip Flag

V

cc

S

Q
Q

R

-

+

Soft-Start

UVLO

Drain

+

-

Max Ip Selection

Over Power

Protection Input

Ip Flag

Ramp Compensation

Figure 2. Internal Block Diagram

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3

NCP1027

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage on all Pins, Except Pin 5 (Drain) V

CC

Drain Voltage BVdss -0.3 to 700 V

Drain Current Peak During Transformer Saturation IDS(pk) 1.8 A

Maximum Current into Pin 1 when Activating the 8.7 V Active Clamp I_V

Thermal Resistance, Junction-to-Air – PDIP7 R

Thermal Resistance, Junction-to-Air – PDIP7 with 1.0 cm@ of 35 m Copper Area R

Maximum Junction Temperature TJ

CC

q

JA

q

JA

MAX

Storage Temperature Range - -60 to +150 °C

ESD Capability, Human Body Model (HBM) (All Pins Except HV) - 2.0 kV

ESD Capability, Machine Model (MM) - 200 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.

1. This device series contains ESD protection and exceeds the following tests:

Human Body Model 2000 V per Mil-Std-883, Method 3015.
Machine Model Method 200 V.

2. This device contains latchup protection and exceeds 100 mA per JEDEC Standard JESD78.

-0.3 to 10 V

15 mA

100 °C/W

75 °C/W

150 °C

ELECTRICAL CHARACTERISTICS (For typical values T

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

J

VCC = 8.0 V, unless otherwise noted.)

Characteristic Pin Symbol Min Typ Max Unit

SUPPLY SECTION AND VCC MANAGEMENT

VCC Increasing Level at which the Switcher Starts to Operate 1 VCC

VCC Decreasing Level at which the Switcher Stops Operation 1 VCC

Hysteresis between VCCON and VCC

(min)

- VCC

Offset Voltage above VCCON at which the Internal Clamp Activates 1 VCC

VCC Voltage at which the Internal Latch is Reset 1 VCC

ON

(min)

hyste

clamp

reset

7.9 8.5 8.9 V

6.7 7.2 7.9 V

- 1.2 - V

140 200 300 mV

- 4.0 - V

Internal IC Consumption, MOSFET Switching at 65 kHz or 100 kHz 1 ICC1 - 1.4 1.9 mA

POWER SWITCH CIRCUIT

Power Switch Circuit On-State Resistance
NCP1027 (Id = 100 mA)

TJ = 25°C
TJ = 125°C

Power Switch Circuit and Startup Breakdown Voltage
(ID

= 120 mA, TJ = 25°C)

(off)

Power Switch and Startup Breakdown Voltage Off-State

5 R

DS(on)

-

-

5.8

9.8

7.0
11

5 BVdss 700 - - V

Idss(OFF)

W

mA

Leakage Current

TJ = 25°C (Vds = 700 V)
TJ = 125°C (Vds = 700 V)

5
5

-

-

50
30

-

-

Switching Characteristics (RL = 50 W, Vds Set for
Idrain = 0.7 x Ilim)

Turn-on Time (90%-10%)
Turn-off Time (10%-90%)

5
5

t

on

t

off

-

-

35
35

-

-

ns
ns

INTERNAL STARTUP CURRENT SOURCE

High-Voltage Current Source, VCC = VCCON – 200 mV 1 IC1 3.5 6.0 8.0 mA

High-Voltage Current Source, VCC = 0 1 IC2 350 650 900 mA

VCC Transition Level for IC1 to IC2 Toggling Point 1 V

CCTh

- 1.3 - V

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4

NCP1027

ELECTRICAL CHARACTERISTICS (continued) (For typical values T

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

J

Max TJ = 150°C, VCC = 8.0 V, unless otherwise noted.)

Characteristic Pin Symbol Min Typ Max Unit

CURRENT COMPARATOR

Maximum Internal Current Setpoint, Pin 4 Open, TJ = 25°C,
FSW = 65 kHz (Note 3)

Final Switch Current with a Primary Slope of 200 mA/ms,
FSW = 65 kHz (Note 4)

Maximum Internal Current Setpoint, Pin 4 Open, TJ = 25°C,
FSW = 100 kHz (Note 3)

Final Switch Current with a Primary Slope of 200 mA/ms,
FSW = 100 kHz (Note 4)

- Ipeak_27_CS_
65 k

- Ipeak_27_SW_
65 k

- Ipeak_27_CS_

100 k

- Ipeak_27_SW_

100 k

720 800 880 mA

- 820 - mA

720 800 880 mA

- 820 - mA

Setpoint Decrease for a Pin 7 Injected Current of 40 mA, TJ = 25°C 7 IOPP - 23 - %

Voltage Level in Pin 7 at which OPP Starts to Operate 7 IOPPtripV - 1.5 - V

Soft-Start Duration - T

Propagation Delay from Current Detection to Drain OFF State - T

Leading Edge Blanking Duration - T

SS

prop

LEB

- 1.0 - ms

- 100 - ns

- 200 - ns

INTERNAL OSCILLATOR

Oscillation Frequency (Note 5)
65 kHz Version, TJ = 25°C

Oscillation Frequency (Note 5)
100 kHz Version, TJ = 25°C

Frequency Jittering in Percentage of f

OSC

- f

- f

- f

OSC

OSC

Jitter

58.5 65 71.5

90 100 110

- "6.0 - %

Jittering Swing Frequency - fswing - 300 - Hz

Maximum Duty Cycle - Dmax 74 80 87 %

FEEDBACK SECTION

Internal Pullup Resistor 4 Rupp - 16 - kW

Ramp Compensation Level on Pin 1 – Rramp = 100 kW 2 Rlevel - 2.75 - V

SKIP CYCLE GENERATION

Internal Skip Mode Level, in Percentage of Maximum Peak Current - Iskip - 25 - %

PROTECTIONS

Brown-Out Level 3 VBO 510 570 620 mV

Brown-Out Hysteresis Current, TJ = 25°C (Note 3) 3 IBOhyste 10 11.5 13 mA

Brown-Out Hysteresis Current, TJ = 0°C to 125°C 3 IBOhyste - 10 - mA

Fault Validation further to Error Flag Assertion - TimerON 40 55 - ms

OFF Phase in Fault Mode - TimerOFF - 440 - ms

Latching Voltage on Brown-Out Pin 3 Vlatch 3.15 3.5 3.85 V

Latch Input Integrating Filter Time Constant 3 TdelBOL - 20 - ms

OVP Integrating Filter Time Constant - TdelOVP - 50 - ms

VCC Current at which the Switcher Stops Pulsing 1 IOVP 6.0 8.5 11 mA

TEMPERATURE MANAGEMENT

Temperature Shutdown - TSD 160 - - °C

Hysteresis in Shutdown - - - 40 - °C

3. See characterization curves for full temperature span evolution.

4. The final switch current is: Ipeak_2X_CS + Tprop x Vin / Lp, with Vin the input voltage and Lp the primary inductor in a flyback.

5. Oscillator frequency is measured with disabled jittering.

kHz

kHz

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5

NCP1027

(

)

11

10

9

8

IOVP (mA)

7

6

140120100806040200-20

TEMPERATURE (°C)

8.9

8.8

8.7

8.6

8.5

(V)

8.4

CCON

8.3

V

8.2

8.1

8.0

7.9

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 3. Figure 4.

7.9

7.8

7.7

7.6

7.5

V

7.4

7.3

CCMIN

7.2

V

7.1

7.0

6.9

6.8

6.7

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

(V)

CCClamp

V

0.24

0.22

0.20

0.18

0.16

0.14

140120100806040200-20

TEMPERATURE (°C)

Figure 5. Figure 6.

1.8

1.6

1.4

ICC1 (mA)

1.2

1.0

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 7. Figure 8.

900

850

800

750

700

650

600

IC2 (mA)

550

500

450

400

350

-20 0 20 40 60 80 100 120 140

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6

TEMPERATURE (°C)

NCP1027

8.0

7.5

7.0

6.5

6.0

5.5

IC1 (mA)

5.0

4.5

4.0

3.5

-20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)

Figure 9. Figure 10.

120

100

80

60

Fosc (kHz)

40

71.0

70.0

69.0

68.0

67.0

66.0

65.0

64.0

Fosc (kHz)

63.0

62.0

61.0

60.0

59.0

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

87.0

85.0

83.0

81.0

Dmax (%)

79.0

20

0

-40 -20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 11. Figure 12.

610

600

590

580

570

560

550

VBO (mV)

540

530

520

510

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 13.

77.0

75.0

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

13.0

12.5

12.0

11.5

11.0

10.5

10.0

IBO HYSTERESIS (mA)

9.5

9.0

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 14.

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7

NCP1027

0

I

k

(

A)

0

0

880

860

840

820

m

800

pea

780

760

740

720

-20 0 20 40 60 80 100 120 140

3.8

3.7

3.6

3.5

Vlatch (V)

3.4

3.3

TEMPERATURE (°C)

Figure 15.

11

10

9

8

7

6

@ ID = 100 mA (W)

5

DS(on)

4

R

3

2

-20 0 20 40 60 80 100 120 14
TEMPERATURE (°C)

Figure 16.

30

28

26

24

22

Iopp (%)

20

18

Ipin 7 = 40 mA

3.2

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 17.

400

380

360

340

320

300

280

260

Tleb + Tpropdelay (ns)

240

220

200

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 19.

16

-20 0 20 40 60 80 100 120 14

TEMPERATURE (°C)

Figure 18.

2.8

2.7

2.6

RAMP COMPENSATION LEVEL (V)

2.5

-20 0 20 40 60 80 100 120 14

TEMPERATURE (°C)

Figure 20.

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8

NCP1027

70

68

66

64

62

60

58

TimerON (ms)

56

54

52

50

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 21.

100%

90%

80%

70%

60%

50%

40%

30%

IPEAK REDUCTION (%)

20%

10%

0%

Figure 23. Ipeak Reduction = F(lopp, @ temperature)

-40 °C

140°C

IOPP (mA)

100

90

80

70

60

50

Idss OFF (mA)

40

30

20

10

-20 0 20 40 60 80 100 120 140

TEMPERATURE (°C)

Figure 22.

85°C

125°C

25°C

0°C

-20 °C

250200150100500

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9