Datasheet

V
CM
V
+
10 PF
0.1 PF
+
-
0.1 PF
0.01 PF
0.01 PF
V
CLAMP
V
CM
0.01 PF
V
+
V
-
0.1 PF
0.1 PF
10 PF
10 PF
0.1 PF
+
-
0.1 PF
V
CLAMP
LMH6553
SNOSB07H –SEPTEMBER 2008–REVISED MARCH 2013 www.ti.com
Figure 66. Split Supply Bypassing Capacitors
Figure 67. Single Supply Bypassing Capacitors
POWER DISSIPATION
The LMH6553 is optimized for maximum speed and performance in the small form factor of the standard WSON
package. To ensure maximum output drive and highest performance, thermal shutdown is not provided.
Therefore, it is of utmost importance to make sure that the T
JMAX
of 150°C is never exceeded.
Follow these steps to determine the maximum power dissipation for the LMH6553:
1. Calculate the quiescent (no-load) power:
P
AMP
= I
CC
* V
S
where
• V
S
= V
+
- V
−
. (Be sure to include any current through the feedback network if V
CM
is not mid-rail.) (1)
2. Calculate the RMS power dissipated in each of the output stages:
P
D
(rms) = rms ((V
S
- V
+
OUT
) * I
+
OUT
) + rms ((V
S
− V
−
OUT
) * I
−
OUT
)
where
• V
OUT
and I
OUT
are the voltage and the current measured at the output pins of the differential amplifier as if they were
single ended amplifiers and V
S
is the total supply voltage (2)
3. Calculate the total RMS power:
P
T
= P
AMP
+ P
D
(3)
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