ST TDR029V1 User Manual

STEVAL-TDR029V1

RF power amplifier demonstration board based on the STAC2942B

Features
■	Excellent thermal stability
■	Frequency: 87.5 - 108 MHz
■ Supply voltage: 48 V
■ Output power: 700 W min
■ Gain: 20 dB typ.
■	Efficiency: 77 % typ
■ Harmonics: - 36 dBc max
■ Gain flatness: ± 0.5 dB max
Description			STEVAL-TDR029V1
The STEVAL-TDR029V1 is a RF broadband
power amplifier intended for FM broadcast radio		Table 1.	Device summary
transmitters over the band 87.5 to 108 MHz using
			Order code
2x STAC2942B N-channel MOS field-effect
transistors.			STEVAL-TDR029V1
STEVAL-TDR029V1 is designed in cooperation
with InnovAction S.r.l in italy.

June 2010

Doc ID 17470 Rev 1

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www.st.com

Contents	STEVAL-TDR029V1

Contents

1	Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		3
	1.1	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
2	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		3
3	Circuit layout and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		4
4	STAC2942B mounting recommendations . . . . . . . . . . . . . . . . . . . . . . . .		5
	4.1	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	4.2	Heat sink selection and preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	4.3	Surface conditions of the mounting base . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	4.4	Thermal interface material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	4.5	Seating plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	4.6	Printed circuit board (PCB) considerations . . . . . . . . . . . . . . . . . . . . . . . .	7
	4.7	Package attachment to thermal base . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7

4.7.1 Hardware: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.7.2 Procedure: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.8 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.9 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

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STEVAL-TDR029V1	Electrical data

1 Electrical data

1.1Maximum ratings

Table 2.	Absolute maximum ratings
Symbol		Parameter	Value	Unit
PIN		Input power	15	W
POUT		Output power	800	W
TSTG		Storage temperature range	-20 to +70	°C
TC		Operating base plate temperature	0 to +70	°C
IDD		Drain current	22	A
PDISS		Power dissipation	400	W

2	Electrical characteristics
	T = +25 oC, V		DD	= 48 V, I	= 2 x 200 mA
	A			dq
	Table 3.	Electrical specification
	Symbol			Test conditions			Min	Typ	Max	Unit
	Frequency	Frequency range					87.5		108	MHz
	POUT						700		750	W
	Gain	POUT = 700 W						20 ± 1		dB
	ND	POUT = 700 W						77		%
	H2	2nd harmonic @ P = 700 W						-40		dBc
					OUT
	H3	3rd harmonic @ P			OUT	= 700 W		-45		dBc
	FL	Gain flatness @ POUT = 700 W							± 0.5	dB

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