PWM Controller, Current Mode, for Offline Power Supplies

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Overview

The NCP1250 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current. 40W Adapter
Over Power Protection (OPP) is a difficult exercise especially when no-load standby requirements drive the converter specifications. The ON proprietary integrated OPP lets you harness the maximum delivered power without affecting your standby performance simply via two external resistors. An Over Voltage Protection input is also combined on the same pin and protects the whole circuitry in case of optocoupler failure or adverse open loop operation.
Finally, a timer-based short-circuit protection offers the best protection scheme, letting you precisely select the protection trip point irrespective of a loose coupling between the auxiliary and the power windings.

  • Offline Adapters
  • AC-DC converters
  • Set-top Boxes
  • Printers
  • Notebooks and Netbooks
  • Non-dissipative internal and adjustable Over Power Protection (OPP) circuits
  • Frequency Foldback down to 26 kHz and Skip-Cycle in light load conditions
  • Internal Ramp Compensation
  • Frequency jittering from full load to skip-cycle
  • Latch input for OVP and OTP implementations
  • See NCP1251 for integrated Over Voltage Protection (OVP) monitoring on the Vcc pin

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5

Product

Status

CAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

Topology

Control Mode

fsw Typ (kHz)

Stand-by Mode

UVLO (V)

Short Circuit Protection

Latch

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Reference Price

NCP1250ASN100T1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-6

1

260

REEL

3000

N

Flyback

Current Mode

100

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

More Details

NCP1250ASN65T1G

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Last Shipments

CAD Model

Pb

A

H

P

TSOP-6

1

260

REEL

3000

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

More Details

NCP1250BP65G

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Active

CAD Model

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

28

300 / 500

$0.4581

More Details

NCP1250BSN100T1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-6

1

260

REEL

3000

N

Flyback

Current Mode

100

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

More Details

NCP1250BSN65T1G

Loading...

Active

CAD Model

Pb

A

H

P

TSOP-6

1

260

REEL

3000

Y

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

28

300 / 500

$0.2215

More Details

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