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| 型号： | LT1074CT7 |
| 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 ~ 45 V |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 5A |
| 同步整流器： | 无 |
| 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1074CT7#06 | 制造商:Linear Technology 功能描述:5A STEP-DOWN SWITCHING REG |
| LT1074CT7#06#PBF | 制造商:Linear Technology 功能描述:5A STEP-DOWN SWITCHING REG 制造商:Linear Technology 功能描述:LT1074CT7#06#PBF |
| LT1074CT7#06PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 8V to 60V 7-Pin(7+Tab) TO-220 制造商:Linear Technology 功能描述:IC REG MULTI CONFIG ADJ TO-220-7 |
| LT1074CT7#PBF | 功能描述:IC REG MULTI CONFIG ADJ TO220-7 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT1074CT7PBF | 制造商:Linear Technology 功能描述:LT1074CT7PBF |
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