Offline Controllers | NCP1253

PWM Controller, Current Mode, for Offline Power Supplies

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The NCP1253 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 it's 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. To avoid sub harmonic oscillations in CCM operation, adjustable slope compensation is available via the series inclusion of a simple resistor in the current sense signal. Besides the auto-recovery timer-based short-circuit protection, an Over Voltage Protection on the Vcc pin protects the whole circuitry in case of optocoupler destruction or adverse open loop operation.

  • Offline Adapters
  • AC-DC converters

  • Set-top Boxes
  • Printers
  • Notebooks and Netbooks

  • Frequency Foldback down to 26 kHz and Skip-Cycle in Light Load
  • Internal Ramp Compensation
  • Frequency Jittering in Normal and Frequency Foldback modes
  • Over Voltage Protection (OVP) monitoring on the Vcc pin
  • Timer-based Auto-Recovery or Latched Short-Circuit Protection

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NCP1253ASN100T1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

N

Flyback

Current Mode

100

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

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NCP1253ASN65T1G

Contact Sales

Obsolete

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

More Details

NCP1253BSN100T1G

Contact Sales

Active

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

Y

Flyback

Current Mode

100

Yes

8.8

Yes

No

Yes

28

300 / 500

$0.2036

More Details

NCP1253BSN65T1G

Contact Sales

Active

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

Y

Flyback

Current Mode

65

Yes

8.8

Yes

No

Yes

28

300 / 500

$0.1768

More Details

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可靠性数据

Die Related Summary Data

Device: NCP1253BSN100T1G

Equivalent to wafer fab process: ONC25

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等效器件小时

平均故障间隔时间/平均无故障时间（按小时计算）

FITS

ONC25

1

2712519294

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Data is based on the following assumptions.

Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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