NXP Semiconductors MRF300AN User manual

QUICK START GUIDE
MRF300AN KIT
MRF300AN ESSENTIALS KIT
Accelerate your RF amplifier design with the MRF300AN
RF Essentials Component Kit.

GET TO KNOW THE MRF300AN KIT
R8 Potentiometer
RFout
RFin
Drain Voltage Ground
JP1
Figure 1: MRF300AN Board Connections
Alternatively, the jumper JP1 can be removed to supply
an external gate voltage on the J1 connector

HOW TO GET STARTED
If the fixture is a new build:
1. Set gate bias to minimum by turning pot fully clockwise (12 turns).
2. Remove JP1 and check drain DC power terminal using an ohmmeter: DC power
terminal should read a high impedance.
3. Replace JP1.
Initial power on:
1. Mount baseplate onto a heatsink capable of dissipating more than 100 W.
2. Terminate RF output with a 50 ohm load capable of dissipating more than 330 W.
3. Connect RF input to a 50 ohm source with RF off.
4. Ensure the drain DC is set to 0 V.
5. Connect ground, drain DC.
6. Raise drain DC slowly to 50 Vdc. Current should be 0 A.
7. Adjust gate bias to desired target current, typically 50-500 mA.
8. Slowly increment RF input power source not exceeding 1 W. Monitor drain DC
current and RF output power (typically less than 10 A max at 300 W).
9. Check drain DC current, RF output power and temperature.
Shutdown:
1. Shut off RF input power.
2. Remove drain DC voltage.
QUICK START GUIDE MRF300AN KIT

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Document Number: MRF300ANEKITQRC Rev. 0
Assembly notes:
• Mount all SMT devices on PCB (device values are dependent on frequency
of operation).
• Make sure no solder blobs are on non-component side of board.
• Trim leads of MRF300AN to shoulder.
• Mount board onto baseplate.
• Mount device using thermal grease, solder only after tightening device
mounting screw.
• Mount connectors and solder center pins.
• Connect power wires