Application Hints

The high current capability of the LM2005 allows it to contin-

uously endure either AC or DC short circuit of the output

with a maximum supply voltage of 16V This will protect the

loudspeaker in a bridge mode when a DC short of the out-

put occurs on one side of the speaker The device will pre-

vent the speaker from destruction by reducing the DC

across the load (bridge mode) to typically less than 2

method

with no damage (maximum operating voltage is 18V) The

device is also protected from load dump or dangerous tran-

sients up to 40V for 50 ms (every 1000 ms) on the supply

with no damage

Protection diodes protect the device driving inductive loads

during which the load can generate voltages greater than

supply or less than ground levels The protection diodes will

rails

The bridge configuration in

Figure 3 is designed for applica-

tions requiring minimal printed circuit board area and maxi-

mum cost effectiveness The circuit will function with the

elimination of bootstrap components R3 C4 and C5 (refer

to

Figure 1 ) This will result in less output power by decreas-

ing output voltage swing to the load By using internal feed-

back resistors (typically 10 kX) feedback components R2

R3 and C2 (

Figure 1 ) may be omitted where closed loop

voltage gain accuracy is not critical The net result is a sta-

ble cost effective circuit that will satisfy many application

needs

TLH5129 – 6

1 kHz

FIGURE 3 Minimal Component Application Circuit

Component Side (Scale 21)

TLH5129 – 7

FIGURE 4 Printed Circuit Board Layout for LM2005

7