1

4

5

1N4001

C1

C2

D1

C3

220

µF

470

µF

0.1

µF

63

2

7

R1

RT1

10k

Ω

4.7k

Ω

V

S

C4

0.22

µF

R7

1.5

Ω

C6

4.7

µF

R3

R4

R2

5.6k

Ω

12k

Ω

8.2k

Ω

C5

R5

R6

Ly

Iy

24.6mH

Ry

2200

µF

330

Ω

9.6

Ω

R5 Iy

to

to

GND

IN

to

t

fly

7

V

*

REF

Re comme nde d for V

filtering

V

REF

8.2

Ω

TDA8172

Figure 2 : AC Test Circuit

Figure 3 : Mounting Examples

MOUNTING INSTRUCTIONS

The power dissipated in the circuit must be re-

moved by adding an external heatsink.

Thanks to the HEPTAWATT

the heatsink is very simple, a screw or a compres-

sion spring (clip) being sufficient.

Between the heatsink and the package it is better

to insert a layer of silicon grease, to optimize the

thermal contact ; no electrical isolation is needed

between the two surfaces, since the tab is con-

nected to Pin 4 which is ground.

TDA8172

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