EL5220T 데이터 시트보기 (PDF) - Renesas Electronics

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EL5220T

12MHz Rail-to-Rail Input-Output Operational Amplifier

Renesas Electronics 

EL5220T

(typical) the device automatically turns ON the outputs

by putting them in a low impedance (normal)

operating state.

Driving Capacitive Loads

As load capacitance increases, the -3dB bandwidth will

decrease and peaking can occur. Depending on the

application, it may be necessary to reduce peaking and

to improve device stability. To improve device stability,

a snubber circuit or a series resistor may be added to

the output of the EL5220T.

A snubber is a shunt load consisting of a resistor in series

with a capacitor. An optimized snubber can improve the

phase margin and the stability of the EL5220T. The

advantage of a snubber circuit is that it does not draw

any DC load current or reduce the gain.

Another method to reduce peaking is to add a series

output resistor (typically between 1 to 10).

Depending on the capacitive loading, a small value

resistor may be the most appropriate choice to

minimize any reduction in gain.

Power Dissipation

With the high-output drive capability of the EL5220T

amplifiers, it is possible to exceed the +150°C absolute

maximum junction temperature under certain load

current conditions. It is important to calculate the

maximum power dissipation of the EL5220T in the

application. Proper load conditions will ensure that the

EL5220T junction temperature stays within a safe

operating region.

The maximum power dissipation allowed in a package is

determined according to Equation 1:

PDMAX

=

T----J---M-----A----X-----–-----T----A---M-----A----X--

JA

(EQ. 1)

where:

• TJMAX = Maximum junction temperature

• TAMAX = Maximum ambient temperature

• JA = Thermal resistance of the package

• PDMAX = Maximum power dissipation allowed

The total power dissipation produced by an IC is the

total quiescent supply current times the total power

supply voltage, plus the power dissipation in the IC

due to the loads, or:

PDMAX = iVS  ISMAX + VS+ – VOUTi   ILOADi 

(EQ. 2)

when sourcing, and:

PDMAX = iVS  ISMAX + VOUTi – VS-   ILOADi 

(EQ. 3)

when sinking, where:

• i = 1 to 2

(1, 2 corresponds to Channel A, B respectively)

• VS = Total supply voltage (VS+ - VS-)

• VS+ = Positive supply voltage

• VS- = Negative supply voltage

• ISMAX = Maximum supply current per amplifier

(ISMAX = EL5220T quiescent current ÷ 2)

• VOUT = Output voltage

• ILOAD = Load current

Device overheating can be avoided by calculating the

minimum resistive load condition, RLOAD, resulting in

the highest power dissipation. To find RLOAD set the

two PDMAX equations equal to each other and solve for

VOUT/ILOAD. Reference the package power dissipation

curves, Figures 32 and 33, for further information.

JEDEC JESD51-3 LOW EFFECTIVE

THERMAL CONDUCTIVITY TEST BOARD

1.0

0.8 781mW

595mW

0.6

DFN8

JA = +160°C/W

0.4

0.2

MSOP8

JA = +210°C/W

0.0

0

25

50

75 85 100

125

AMBIENT TEMPERATURE (°C)

150

FIGURE 32. PACKAGE POWER DISSIPATION vs

AMBIENT TEMPERATURE

JEDEC JESD51-7 HIGH EFFECTIVE

THERMAL CONDUCTIVITY TEST BOARD

2.4

2.16W

2.0

DFN8

1.6

JA = +58°C/W

1.2

0.8 740mW

MSOP8

JA = +170°C/W

0.4

0.0

0

25

50

75 85 100

125

150

AMBIENT TEMPERATURE (°C)

FIGURE 33. PACKAGE POWER DISSIPATION vs

AMBIENT TEMPERATURE

FN6892 Rev 0.00

May 4, 2010

Page 12 of 15

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