12

LT1210

1210fa

S

APPLICATI

I FOR ATIO

then:

for the SO package with 1000 sq. mm topside

heat sinking

for the R package with 1000 sq. mm topside heat

sinking

Since the maximum junction temperature is 150

°C,

both packages are clearly acceptable.

–

+

LT1210

SD

–15V

15V

24k

10k

5V

2N3904

1210 TA04

CMOS Logic to Shutdown Interface

Precision

×10 High Current Amplifier

–

+

LT1097

–

+

LT1210

SD

COMP

0.01

µF

3k

330

Ω

9.09k

1k

OUT

OUTPUT OFFSET: < 500

µV

SLEW RATE: 2V/

µs

BANDWIDTH: 4MHz

1210 TA03

500pF

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.

–

+

LT1210

SD

5V

–5V

680

Ω

220

Ω

10

Ω

0V

2V

76mA

1210 F07

–2V

A

Figure 7