High Voltage Switching Regulator for Offline SMPS

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概览

The NCP1072 / NCP1075 products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a PDIP-7 or SOT-223 package, the NCP1072/5 offer a high level of integration, including soft-start, frequency-jittering, short-circuit protection, skip-cycle, a maximum peak current set point, ramp compensation, and a Dynamic Self-Supply (eliminating the need for an auxiliary winding).

Unlike other monolithic solutions, the NCP1072/5 is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65, 100 or 130 kHz). When the output power demand diminishes, the IC automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, it enters into a skip mode to reduce the standby consumption down to a no load condition.

Protection features include: a timer to detect an overload or a short-circuit event, Overvoltage Protection with auto-recovery and AC input line voltage detection.

For improved standby performance, the connection of an auxiliary winding stops the DSS operation and helps to reduce input power consumption below 50 mW at high line.

  • Auxiliary Supply
  • Isolated Standby Power Supply
  • White Goods
  • Smart Meter / E-Meter
  • Integrated 700 V MOSFET with RDS(on) of 11 Ω
  • Current-Mode Fixed Frequency Operation (65/100/130 kHz)
  • Peak Current: NCP1072 = 250mA / NCP1075 = 450 mA
  • Skip-Cycle Operation at Low Peak Current
  • Dynamic Self-Supply (DSS)
  • Auto-Recovery Output Short Circuit Protection with Timer-Based Detection
  • Frequency Foldback Operation
  • 300µA No Load Power Consumption
  • Frequency Jittering (including during frequency foldback mode)
  • AC Input Voltage Line Detection

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fsw Typ (kHz)

fJitter Typ (%)

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Reference Price

NCP1072P065G

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Obsolete

CAD Model

Pb

A

H

P

PDIP-7

NA

0

TUBE

50

N

Current Mode

65

Yes

Yes

11

700

250

Yes

8

6.4

Yes

No

No

No

Price N/A

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NCP1072P100BG

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Active

CAD Model

Pb

A

H

P

PDIP-7

NA

0

TUBE

50

Y

Current Mode

100

Yes

Yes

11

700

250

Yes

8

6.4

Yes

No

No

No

$0.4836

More Details

NCP1072P100G

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Last Shipments

CAD Model

Pb

A

H

P

PDIP-7

NA

0

TUBE

50

N

Current Mode

100

Yes

Yes

11

700

250

Yes

8

6.4

Yes

No

No

No

Price N/A

More Details

NCP1072STAT3G

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Active

CAD Model

Pb

A

H

P

SOT-223-4 / TO-261-4D

1

260

REEL

4000

Y

Current Mode

65

Yes

Yes

11

700

250

Yes

8

6.4

Yes

No

No

No

$0.5762

More Details

NCP1072STBT3G

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Active

CAD Model

Pb

A

H

P

SOT-223-4 / TO-261-4D

1

260

REEL

4000

Y

Current Mode

100

Yes

Yes

11

700

250

Yes

8

6.4

Yes

No

No

No

$0.5762

More Details

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