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MCP621 数据表(PDF) 24 Page - Microchip Technology

部件名 MCP621
功能描述  20 MHz, 2.5 mA Op Amps with mCal
PDF  44 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP621 数据表(HTML) 24 Page - Microchip Technology

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MCP621/2/5
DS22188A-page 24
© 2009 Microchip Technology Inc.
Figure 4-7 shows a capacitive load (CL), which is
driven by a sine wave with DC offset. The capacitive
load causes the op amp to output higher currents at
higher frequencies. Because the output rectifies IOUT,
the op amp’s dissipated power increases (even though
the capacitor does not dissipate power).
FIGURE 4-8:
Diagram for Capacitive Load
Power Calculations.
The output voltage is assumed to be:
EQUATION 4-4:
The op amp’s currents are:
EQUATION 4-5:
The op amp’s instantaneous power, average power
and peak power are:
EQUATION 4-6:
The power dissipated in a package depends on the
powers dissipated by each op amp in that package:
EQUATION 4-7:
The maximum ambient to junction temperature rise
(
ΔTJA) and junction temperature (TJ) can be calculated
using the maximum expected package power (PPKG),
ambient temperature (TA) and the package thermal
resistance (
θJA) found in Section “Temperature
Specifications”:
EQUATION 4-8:
The worst case power de-rating for the op amps in a
particular package can be easily calculated:
EQUATION 4-9:
Several techniques are available to reduce
ΔTJA for a
given package:
• Reduce
θJA
- Use another package
- Improve the PCB layout (ground plane, etc.)
- Add heat sinks and air flow
• Reduce max(PPKG)
- Increase RL
- Decrease CL
- Limit IOUT using RISO (see Figure 4-9)
- Decrease VDD
CL
VDD
VOUT
IDD
ISS
IOUT
VSS
MCP62X
V
OUT
V
DC
V
AC
ωt
()
sin
+
=
Where:
VDC =DC offset (V)
VAC = Peak output swing (VPK)
ω = Radian frequency (2π f) (rad/s)
I
OUT
C
L
dV
OUT
dt
-----------------
⋅
V
ACωCL
ωt
()
cos
==
I
DD
I
Q
max 0 I
OUT
,
()
+
≈
I
SS
I
–
Q
min 0 I
OUT
,
()
+
≈
Where:
IQ = Quiescent supply current for one op
amp (mA/amplifier)
P
OA
I
DD VDD
V
OUT
–
() I
SS VSS
V
OUT
–
()
+
=
ave P
OA
()
V
DD
V
SS
–
() I
Q
4V
AC fCL
π
------------------------
+
⎝⎠
⎛⎞
=
max P
OA
()
V
DD
V
SS
–
() I
Q
2V
AC fCL
+
()
=
P
PKG
P
OA
k1
=
n
∑
=
Where:
n = Number of op amps in package (1 or 2)
ΔT
JA
P
PKGθJA
=
T
J
T
A
ΔT
JA
+
=
P
PKG
T
Jmax
T
A
–
θ
JA
--------------------------
≤
Where:
TJmax = Absolute maximum junction
temperature (°C)
TA = Ambient temperature (°C)



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