参数资料
型号: LT1076HVCT7
厂商: Linear Technology
文件页数: 12/16页
文件大小: 0K
描述: IC REG MULTI CONFIG ADJ TO220-7
标准包装: 50
类型: 降压(降压),升压(升压),反相,回扫
输出类型: 可调式
输出数: 1
输出电压: 2.5 V ~ 50 V
输入电压: 8 V ~ 64 V
频率 - 开关: 100kHz
电流 - 输出: 2A
同步整流器:
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: TO-220-7 成形引线
包装: 管件
供应商设备封装: TO-220-7
LT1074/LT1076
PI DESCRIPTIO S
5.8V
Q4
90 μ A
Q3
90 μ A
50 μ A
D1
V C
EXTERNAL
FREQUENCY
Q1
X1.8
Q2
FB
50 μ A
D2
Q6
90 μ A
R C
COMPENSATION
2.21V
140 μ A
300 ?
ALL CURRENTS SHOWN ARE AT NULL CONDITION
Figure 10. Error Amplifier
C C
LT1074 ? PD11
A V =
G m
2 π ? f ? C C
at mid frequencies
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
A V = G m ? R C at high frequencies
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:
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
f POLE =
1
2 π ? r O ? C
r O ≈ 400 k ?
positive outputs and by D1 and D2 when the output goes
low. Low clamp voltage is approximately one diode drop
( ≈ 0.7V – 2mV/ ° C).
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 .
Note that both the FB pin and the V C pin have other internal
connections. Refer to the frequency shifting and synchro-
nizing discussions.
f ZERO =
1
2 π ? R C ? C C
sn1074 1074fds
12
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LT1076HVCT7#06 制造商:Linear Technology 功能描述:Step-Down Switching Regulator
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