EL2157CS datasheet(17/20 Pages) ELANTEC

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EL2150CEL2157C

125 MHz Single Supply Clamping Op Amps

Applications Information

Contd

The maximum power dissipation allowed in a

package is determined according to 1

PDMAX e

TJMAX–TAMAX

iJA

where

TJMAX e Maximum Junction Temperature

TAMAX e Maximum Ambient Temperature

iJA e Thermal Resistance of the Package

PDMAX e Maximum Power Dissipation in the

Package

The maximum power dissipation actually pro-

duced by an IC is the total quiescent supply cur-

rent times the total power supply voltage plus

the power in the IC due to the load or 2

PDMAX e VS ISMAXa(VS–VOUT)

VOUT

where

VS e Total Supply Voltage

ISMAX e Maximum Supply Current

VOUT e Maximum Output Voltage of the Appli-

cation

RL e Load Resistance tied to Ground

If we set the two PDMAX equations

equal to each other and solve for VS we can get a

family of curves for various loads and output

voltages according to 3

VS e

RL (TJMAX b TAMAX)

iJA

(VOUT)2

(IS RL) a VOUT

Figures 11 through 13 show total single supply

voltage VS vs RL for various output voltage

swings for the PDIP and SOIC packages The

curves assume WORST CASE conditions of TA

85 C and IS e 65 mA

VOUT (PDIP Package)

vs RLOAD for Various

Single Supply Voltage

2150 – 69

Figure 11

VOUT (SO Package)

vs RLOAD for Various

Single Supply Voltage

2150 – 70

Figure 12

VOUT (SOT23-5 Package)

vs RLOAD for Various

Single Supply Voltage

2150 – 73

Figure 13

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