Variable Off Time Controller

Obsolete

Overview

The NCP1215A is a controller for low power off-line flyback Switched Mode Power Supplies (SMPS) featuring low size, weight and cost constraints together with a good low standby power performance. The operating principle uses switching frequency reduction at light load by increasing the OFF Time. Also, when OFF Time expands, the peak current is gradually reduced down to approximately 1/4 of the maximum peak current to prevent from exciting the transformer mechanical resonances. The risk of acoustic noise is thus greatly diminished while keeping good standby power performance.

  • Auxiliary Power Supply
  • Stand-by Power Supply
  • AC/DC Adapter
  • Off-line Battery Charger

  • Variable OFF Time Control Method
  • Very Low Current Consumption at Start-up
  • Natural Frequency Dithering for Improved EMI Signature
  • Current Mode Control Operation
  • Peak Current Compression Reduces Transformer Noise
  • Programmable Current Sense Resistor Peak Voltage
  • Undervoltage Lockout
  • Pb-Free Packages are Available

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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

Soft Start

VCC Max (V)

Drive Cap. (mA)

Reference Price

NCP1215ASNT1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-6

1

260

REEL

3000

N

Flyback

Current Mode

Variable

Yes

Yes

No

No

No

18

30 / 30

Price N/A

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