LT1210 Linear Technology, LT1210 Datasheet - Page 12

• Manufacturer Part Number: LT1210
• Description: 1.1A/ 35MHz Current Feedback Amplifier
• Manufacturer: Linear Technology

LT1210
A
T7 Package, 7-Lead TO-220
Thermal Resistance (Junction-to-Case) = 5 C/W
Calculating Junction Temperature
The junction temperature can be calculated from the
equation:
where:
As an example, calculate the junction temperature for the
circuit in Figure 7 for the SO and R packages assuming a
70 C ambient temperature.
The device dissipation can be found by measuring the
supply currents, calculating the total dissipation and then
subtracting the dissipation in the load and feedback
network.
TYPICAL APPLICATIONS
12
V
IN
PPLICATI
OUTPUT OFFSET: < 500 V
SLEW RATE: 2V/ s
BANDWIDTH: 4MHz
STABLE WITH C
T
T
T
P
P
J
J
A
JA
D
D
= (P
= Junction Temperature
= Ambient Temperature
= Device Dissipation
= (76mA)(10V) – (1.4V)
+
–
= Thermal Resistance (Junction-to-Ambient)
LT1097
D
)(
Precision 10 High Current Amplifier
L
< 10nF
JA
O
) + T
U
S
A
500pF
I FOR ATIO
330
U
2
/ 10 = 0.56W
1k
U
+
–
W
LT1210
SD
9.09k
COMP
3k
0.01 F
U
1210 TA03
OUT
then:
Since the maximum junction temperature is 150 C,
both packages are clearly acceptable.
T
T
J
J
= (0.56W)(46 C/W) + 70 C = 96 C
for the SO package with 1000 sq. mm topside
heat sinking
= (0.56W)(27 C/W) + 70 C = 85 C
for the R package with 1000 sq. mm topside heat
sinking
220
CMOS Logic to Shutdown Interface
5V
10k
–
+
LT1210
–5V
5V
A
+
–
–15V
15V
LT1210
680
76mA
SD
Figure 7
SD
2N3904
V
1210 TA04
O
10
24k
V
O
= 1.4V
RMS
1210 F07
2V
0V
–2V