Key facts
- Brand
- Fairchild
- Model
- FAN6754A
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-01
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Fairchild Semiconductor FAN6754A Design Guideline to Replace SG6742
The FAN6754A is a highly integrated PWM controller featuring green mode, frequency hopping, constant power limit, and various protection functions. It offers a direct replacement for the SG6742 with the same pin configuration, allowing for PCB layout changes without modification. Functional improvements include reduced operating current for lower standby power and enhanced efficiency through reduced current sensing loss.
The document provides detailed guidance on circuit modifications required for the transition. Key changes involve adjusting the feedback resistor to account for the higher FB impedance, modifying the HV startup circuit for better line surge immunity, and utilizing the two-step UVLO mechanism. It also covers the operation of the internal soft-start, green-mode, and burst-mode functions, along with specific considerations for the output driver and current sensing.
Fairchild FAN6754A specifications
| Operating Current | 1.7mA |
|---|---|
| Maximum Duty Cycle | 89% |
| Soft-Start Time | 8ms |
| FB Impedance | 15.5KQ |
| Gate Drive Clamping Voltage | 13V |
Source: Fairchild Semiconductor FAN6754A Design Guideline to Replace SG6742
All Fairchild FAN6754A documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
Can the FAN6754A directly replace the SG6742?
Yes, the two devices have the same pin configuration and direct replacement can be achieved without PCB layout change.
From: Fairchild Semiconductor FAN6754A Design Guideline to Replace SG6742
What is the typical standby power consumption of the FAN6754A?
The operating current is reduced to achieve less than 100mW standby power consumption for most designs.
From: Fairchild Semiconductor FAN6754A Design Guideline to Replace SG6742
What is the operating current of the FAN6754A?
The device has a low operating current of 1.5mA.
From: Fairchild Semiconductor FAN6754A PWM Controller Datasheet
How does the FAN6754A reduce EMI emission?
It integrates a frequency-hopping function internally to reduce EMI emission.
From: Fairchild Semiconductor FAN6754A PWM Controller Datasheet