Description

The 3309P-1-204 is a trimmer potentiometer belonging to the product category of trimmer potentiometers, which are electronic components used for adjusting and calibrating resistive values in circuits. This specific model is designed as an Adaptive Alternator Voltage Regulator, aimed at regulating the output voltage in diode-rectified alternator charging systems common to automotive applications. One of its key features is the provision of either an analog or digital fixed frequency duty cycle (ON/OFF ratio) control of an alternator’s field current. It also boasts four Load Response Control (LRC) rates selectable by connecting pins 7 and 8 to ground, which facilitate controlling the alternator field current under prevailing engine conditions to eliminate engine speed hunting and vibrations caused by abrupt torque loading of the engine owing to sudden electrical loads being applied to the system at low engine RPM. Additional features include stable output voltage with minimal variation over engine speeds and field current levels, externally controlled MOSFET and field flyback diode recovery characteristics for minimum RFI (Radio-Frequency Interference), and trimmable devices available at 14.6 V and 14.8 V (typical) Vset.

Specifications and features

• Product Model: 3309P-1-204
• Product Category: Trimmer Potentiometers
• Application: Adaptive Alternator Voltage Regulator for diode-rectified automotive charging systems
• Control: Analog or Digital fixed frequency duty cycle (ON/OFF ratio) control of an alternator’s field current
• Features:
  • External High-Side MOSFET Control of a Ground-Referenced Field Winding
  • Load Response Control (LRC):
  • Selectable LRC rates by connecting pins 7 and 8 to ground
  • LRC active during initial start
  • Stable Output Voltage:
  • Vset at ±0.1 V @ 25°C
  • <0.1 V Variation Over Engine Speeds of 2,000 to 10,000 RPM
  • <0.2 V Variation Over 10% to 95% of Maximum Field Current
  • Controlled MOSFET and Field Flyback Diode Recovery Characteristics for Minimum RFI
  • Trimmable Devices Available at 14.6 V and 14.8 V (typical) Vset
  • Pb-Free Packaging Designated by Suffix Code EG

Application Scenarios

The 3309P-1-204 is primarily designed for use as an Adaptive Alternator Voltage Regulator in diode-rectified automotive charging systems. It can also be used as a trimmer potentiometer in a variety of circuits that require adjustment and calibration of resistive values.

Comparison

• Stable Output Voltage
• LRC feature eliminates engine speed hunting and vibrations caused by abrupt torque loading of the engine
• Controlled MOSFET and Field Flyback Diode Recovery Characteristics minimize RFI

• Designed specifically for diode-rectified alternator charging systems used in automotive applications
• May not be suitable for applications where stable output voltage regulation is not a primary requirement