Controllers | FAN6791

Dual-PWM Combination Controller for Flyback and Forward Converter

Obsolete

Datasheet

Products

Overview

The highly integrated FAN6791 dual PWM combination controller provides several features to enhance the performance of converters.
To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency at light-load conditions. To avoid acoustic-noise problems, the minimum PWM frequency is set above 20kHz. This green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage startup circuitry, the power loss due to bleeding resistors is also eliminated. To further reduce power consumption, FAN6791 is manufactured using the CMOS process, which allows an operating current of only 6mA.
FAN6791 integrates a frequency-jittering function internally to reduce EMI emissions of a power supply with minimum line filters. The built-in synchronized slope compensation achieves stable peak-current-mode control. The proprietary internal line compensation ensures constant output power limit.
FAN6791 provides many protection functions, including brownout protection, cycle-by-cycle current limiting, and an internal open-loop protection circuit to ensure safety should an open-loop or output short-circuit failure occur. PWM output is disabled until VDD drops below the UVLO lower limit when the controller restarts. As long as VDD exceeds ~24.5V, the internal OVP circuit is triggered.

  • Desktop PC

  • High-Voltage Startup
  • Low Operating Current
  • Interleaved Stand-by PWM / Forward PWM Switching
  • Green Mode Stand-by PWM / Forward PWM
  • Linearly Decreasing Stand-by PWM Frequency to 20kHz
  • Remote On / Off
  • AC Brownout Protection
  • Forward PWM with Soft-Start
  • Frequency Hopping to Reduce EMI Emissions
  • Cycle-by-Cycle Current Limiting for Stand-by PWM / Forward PWM
  • Leading-Edge Blanking for Stand-by PWM / Forward PWM
  • Synchronized Slope Compensation for Stand-by PWM / Forward PWM
  • GATE Output Maximum Voltage Clamp
  • VDD Over-Voltage Protection (OVP)
  • Internal Open-Loop Protection for Stand-by PWM / Forward PWM
  • VDD Under-Voltage Lockout (UVLO)
  • Constant Power Limit for Stand-by PWM / Forward PWM

Tools and Resources

Product services, tools and other useful resources related to FAN6791

CAD Model

CAD Model

Material Composition

Product Change Notification

Reliability Data

Product List

If you wish to buy products or product samples, please log in to your onsemi account.

Search

Close Search

Products:

1

Share

Sort by

Product Groups:

┗

Orderable Parts:

1

Product

Status

CAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

Topology

Phases

Control Mode

VCC Min (V)

VCC Max (V)

fSW Typ (kHz)

Reference Price

FAN6791MY

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-16

751BG

3

260

REEL

2500

N

-

-

-

15

17

-

Price N/A

More Details

Show More

1-25 of 25

Products per page

Jump to :

1

Support on the go

Find and compare products, get support and connect with onsemi sales team.

Reliability Data

Die Related Summary Data

Device: FAN6791MY

Equivalent to wafer fab process: CN

Product Technology

Product Technology

Equivalent Device-Hours

MTBF/MTTF in Hours

FITS

CN

6

425600109

More Details

Re-calculate Data

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.)

New Search