Controller, Variable Off-Time Current Mode, with Short Circuit Protection

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Overview

The NCP1351 is a current mode controller targeting low power off line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance. Based on a fixed peak current technique (quasi fixed TON), the controller decreases its switching frequency as the load becomes lighter. As a result, a power supply using the NCP1351 naturally offers excellent no load power consumption, while optimizing the efficiency in other loading conditions. When the frequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to prevent transformer mechanical resonance. The risk of acoustic noise is thus greatly diminished while keeping good standby power performance.
An externally adjustable timer permanently monitors the feedback activity and protects the supply in presence of a short circuit or an overload. Once the timer elapses, NCP1351 stops switching and stays latched for version A, and tries to restart for Version B.
The internal structure features an optimized arrangement which allows one of the lowest available startup current, a fundamental parameter when designing low standby power supplies. The negative current sensing technique minimizes the impact of the switching noise on the controller operation and offers the user to select the maximum peak voltage across his current sense resistor. Its power dissipation can thus be application optimized.
Finally, the bulk input ripple ensures a natural frequency smearing which smooths the EMI signature.

  • Auxiliary Power Supply
  • Off-line battery chargers
  • Printers
  • Adapters
  • Quasi fixed TON, Variable TOFF Current Mode Control
  • Frequency foldback with Peak Current Compression
  • Short circuit protection (latched A version or auto restart B version)
  • Primary or secondary side regulation
  • Dedicated Latch Input for OTP, OVP
  • Low start-up current
  • Natural frequency jittering
  • Negative current sensing with programmable current sense resistor

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8

Product

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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

NCP1351ADR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

NCP1351APG

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Obsolete

CAD Model

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

NCP1351BDR2G

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

NCP1351BPG

Loading...

Obsolete

CAD Model

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

NCP1351CDR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

NCP1351CPG

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Obsolete

CAD Model

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

NCP1351DDR2G

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

NCP1351DPG

Loading...

Obsolete

CAD Model

Pb

A

H

P

PDIP-8

NA

0

TUBE

50

N

Flyback

Current Mode

Variable

No

Yes

Yes

Yes

No

28

400 / 400

Price N/A

More Details

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