PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design

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Overview

The NCP1247 is a new fixed-frequency current-mode PWM controller featuring Dynamic Self-Supply. This function greatly simplifies the design of the auxiliary supply and the Vcc capacitor by activating the internal startup current source to supply the controller during start-up, transients, latch, stand-by etc. This device contains a special HV detector which detects the application unplug from the AC input line and triggers the X2 discharge current. The HV structure also includes brown-out detection circuitry.
The NCP1247 features a timer-based fault detection that ensures the detection of overload and an adjustable power compensation to help keep the maximum power independent of the input voltage.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for robust power supply designs.
A dedicated off mode allows the SMPS to reach extremely low no load input power consumption when combined with secondary side controller NCP4353 or NCP4354. When used together, the SMPS is capable of achieving <10 mW no load input power consumption. The secondary side controller signals the NCP1247 to enter a sleep mode, minimizing the power consumption of the control circuitry. The NCP1247 is very similar in its functionality to the NCP1246. The NCP1247 is designed to get better performance out of systems with synchronous rectification.

NCP1247
- Adds C & D option for different Brown Out threshold
- Enhanced operation with Sync Rec in light load
- Increased HV timer
- Revised X2 discharge sequence

This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.

  • AC-DC Adapters
  • LCD TV power supplies
  • USB-Pd (USB Power Delivery)
  • Offline USB Pd
  • Notebook Computers
  • Offline USB Power Delivery SMPS
  • Frequency foldback and skip mode
  • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation
  • High-voltage startup with dynamic self supply
  • Integrated brown-out detection
  • Frequency Modulation
  • Adjustable overpower protection
  • Latch off input

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Reference Price

NCP1247AD065R2G

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1247AD100R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1247BD065R2G

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Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

$0.5143

More Details

NCP1247BD100R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1247CD065R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1247CD100R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1247DD065R2G

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Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

$0.5143

More Details

NCP1247DD100R2G

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

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