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參數(shù)資料
| 型號： | T1074HV |
| 廠商： | Linear Technology Corporation |
| 英文描述： | BOX EXTRUD ALUM 8.66X6.30X1.20,1 |
| 中文描述： | 降壓型開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 215K |
| 代理商： | T1074HV |
LT1074/LT1076
12
Figure 10. Error Amplifier
DESCRIPTIO S
PI
U
A
G
R athigh frequencies
atmidfrequencies
A
G
V
m
C
V
m
=
=
2
π
Phase shift from the FB pin to the V
C
pin is 90
°
at mid
frequencies where the external C
C
is controlling gain, then
drops back to 0
°
(actually 180
°
since FB is an inverting
input) when the reactance of C
C
is small compared to R
C
.
The low frequency “pole” where the reactance of C
C
is
equal to the output impedance of Q4 and Q6 (r
O
), is:
f
r
Cr
k
POLE
O
O
=
≈
1
2
400
π
Although f
POLE
varies as much as 3:1 due to r
O
variations,
mid-frequency gain is dependent only on G
m
, which is
specified much tighter on the data sheet. The higher
frequency “zero” is determined solely by R
C
and C
C
.
f
R
C
ZERO
C
C
=
1
2
π
The error amplifier has asymmetrical peak output current.
Q3 and Q4 current mirrors are unity-gain, but the Q6
mirror has a gain of 1.8 at output null and a gain of 8 when
the FB pin is high (Q1 current = 0). This results in a
maximum positive output current of 140
μ
A and a maxi-
mum negative (sink) output current of
1.1mA. The asym-
metry is deliberate—it results in much less regulator
output overshoot during rapid start-up or following the
release of an output overload. Amplifier offset is kept low
by area scaling Q1 and Q2 at 1.8:1.
Amplifier swing is limited by the internal 5.8V supply for
positive outputs and by D1 and D2 when the output goes
low. Low clamp voltage is approximately one diode drop
(
≈
0.7V – 2mV/
°
C).
Note that both the FB pin and the V
C
pin have other internal
connections. Refer to the frequency shifting and synchro-
nizing discussions.
140 A
μ
Q1
LT1074 PD11
Q2
FB
V
50 A
μ
90 A
Q6
300
C
Q4
5.8V
C
C
R
C
Q3
50 A
μ
2.21V
EXTERNAL
FREQUENCY
COMPENSATION
90 A
D1
90 A
D2
X1.8
ALL CURRENTS SHOWN ARE AT NULL CONDITION
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| T10A100 | MICROMATE FEMALE PCB EDGEMT. RoHS Compliant: Yes |
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| T10A | BOX EXTRUD ALUM 8.66X6.30X2.03,1 |
| T10A062 | Glass passivated junction |
| T10A068 | Glass passivated junction |
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