PWM Controller, Current Mode, for Offline Power Supplies

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Overview

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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4

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CAD Models

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Case Outline

MSL Type

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Container Type

Container Qty.

ON Target

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Control Mode

fsw Typ (kHz)

Stand-by Mode

UVLO (V)

Short Circuit Protection

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Reference Price

NCP1253ASN100T1G

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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

NCP1253ASN65T1G

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Obsolete

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

NCP1253BSN100T1G

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Active

CAD Model

Pb

A

H

P

TSOP-6

1

260

REEL

3000

Y

Flyback

Current Mode

100

Yes

8.8

Yes

No

Yes

28

300 / 500

$0.2036

More Details

NCP1253BSN65T1G

Loading...

Active

CAD Model

Pb

A

H

P

TSOP-6

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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