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16
Table 2. OTA COMPENSATION TRANSFER FUNCTION AND COMPENSATION VALUES
Desired OTA Gain at Cross−over
Frequency f
c
(G)
10
desired_G
fc_gain_db
20
Desired Phase Boost at Cross−
over Frequency f
c
(boost)
ǒ
q
margin
* arg
ǒ
H
ctrl_output
(
fc
)
Ǔ
180°
p
* 90°
Ǔ
p
180°
Select OTA Compensation Zero to
Coincide with Modulator Pole at
f
p1
(f
z
)
w
p1e
2p
Resulting OTA High Frequency
Pole Placement (f
p
)
f
z
f
c
) f
c
2
tan(boost)
f
c
* f
z
tan(boost)
Compensation Resistor (R
2
)
f
p
G
f
p
* f
z
V
OUT
1.2 g
m
1 )
ǒ
f
c
f
p
Ǔ
2
Ǹ
1 )
ǒ
f
z
f
p
Ǔ
Ǹ
Compensation Capacitor (C
1
)
1
2pf
2
R
2
Compensation Capacitor (C
2
)
1
2pf
p
1.2 g
m
V
OUT
OTA DC Gain (G
0_OTA
)
V
ref
V
OUT
g
m
R
0
Low Frequency Zero (w
z1e
)
1
2
ǒ
R
2
) R
esd
Ǔ
R
2
R
esd
C
2
ȧ
ȱ
Ȳ
1 * 1 * 4
R
2
R
esd
C
2
ǒ
R
2
) R
esd
Ǔ
2
C
1
Ǹ
ȧ
ȳ
ȴ
High Frequency Zero (w
z2e
)
1
2
ǒ
R
2
) R
esd
Ǔ
R
2
R
esd
C
2
ȧ
ȱ
Ȳ
1 ) 1 * 4
R
2
R
esd
C
2
ǒ
R
2
) R
esd
Ǔ
2
C
1
Ǹ
ȧ
ȳ
ȴ
Low Frequency Pole (w
p1e
)
1
2
ǒ
R
0
) R
2
) R
esd
Ǔ
R
2
ǒ
R
0
) R
esd
Ǔ
C
2
ȧ
ȱ
Ȳ
1 * 1 * 4
R
2
ǒ
R
0
) R
esd
Ǔ
C
2
ǒ
R
0
) R
2
) R
esd
Ǔ
2
C
1
Ǹ ȧ
ȳ
ȴ
High Frequency Pole (w
p2e
)
1
2
ǒ
R
0
) R
2
) R
esd
Ǔ
R
2
ǒ
R
0
) R
esd
Ǔ
C
2
ȧ
ȱ
Ȳ
1 ) 1 * 4
R
2
ǒ
R
0
) R
esd
Ǔ
C
2
ǒ
R
0
) R
2
) R
esd
Ǔ
2
C
1
Ǹ ȧ
ȳ
ȴ
OTA Transfer Function (G
OTA
(f))
−G
0_OTA
1 ) j
2pf
w
z1e
1 ) j
2pf
w
p1e
1 ) j
2pf
w
z2e
1 ) j
2pf
w
p2e
The open−loop−response in closed−loop form to verify the gain/phase margins may be obtained from the following
expressions.
T(f) + G
OTA
(f)H
ctrl_output
(f)
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PACKAGE DIMENSIONS
SOIC−8 NB
CASE 751−07
ISSUE AK
SEATING
PLANE
1
4
58
N
J
X 45
_
K
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. 751−01 THRU 751−06 ARE OBSOLETE. NEW
STANDARD IS 751−07.
A
B
S
D
H
C
0.10 (0.004)
DIM
A
MIN MAX MIN MAX
INCHES
4.80 5.00 0.189 0.197
MILLIMETERS
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.053 0.069
D 0.33 0.51 0.013 0.020
G 1.27 BSC 0.050 BSC
H 0.10 0.25 0.004 0.010
J 0.19 0.25 0.007 0.010
K 0.40 1.27 0.016 0.050
M 0 8 0 8
N 0.25 0.50 0.010 0.020
S 5.80 6.20 0.228 0.244
−X−
−Y−
G
M
Y
M
0.25 (0.010)
−Z−
Y
M
0.25 (0.010) Z
S
X
S
M
____
1.52
0.060
7.0
0.275
0.6
0.024
1.270
0.050
4.0
0.155
ǒ
mm
inches
Ǔ
SCALE 6:1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
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