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| 型号： | LT1076IT#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 2A TO220 |
| 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： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 成形引线 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-5 |
| 产品目录页面： | 1325 (CN2011-ZH PDF) |
LT1074/LT1076
PI DESCRIPTIO S
V IN PIN
The V IN pin is both the supply voltage for internal control
circuitry and one end of the high current switch. It is
? V OUT =
( ? V GND )( V OUT )
2 . 21
important,especiallyatlowinputvoltages,thatthispinbe
bypassed with a low ESR, and low inductance capacitor to
prevent transient steps or spikes from causing erratic
operation. At full switch current of 5A, the switching
transients at the regulator input can get very large as
shown in Figure 1. Place the input capacitor very close to
the regulator and connect it with wide traces to avoid extra
inductance. Use radial lead capacitors.
To ensure good load regulation, the ground pin must be
connected directly to the proper output node, so that no
high currents flow in this path. The output divider resistor
should also be connected to this low current connection
line as shown in Figure 2.
LT1074
( ) (
dl
dt
L P
)
GND
FB
R2
STEP =
( I SW ) ( ESR )
RAMP =
( I SW ) ( T ON )
HIGH CURRENT
RETURN PATH
NEGATIVE OUTPUT NODE
WHERE LOAD REGULATION
C
LT1074?PD01
Figure 1. Input Capacitor Ripple
L P = Total inductance in input bypass connections
and capacitor.
“Spike” height (dI/dt ? L P ) is approximately 2V per
inch of lead length for LT1074 and 0.8V per inch for
LT1076.
“Step” for ESR = 0.05 ? and I SW = 5A is 0.25V.
“Ramp” for C = 200 μ F, T ON = 5 μ s, and I SW = 5A,
is 0.12V.
Input current on the V IN Pin in shutdown mode is the sum
of actual supply current ( ≈ 140 μ A, with a maximum of
300 μ A), and switch leakage current. Consult factory for
special testing if shutdown mode input current is critical.
GROUND PIN
It might seem unusual to describe a ground pin, but in the
case of regulators, the ground pin must be connected
properly to ensure good load regulation. The internal
reference voltage is referenced to the ground pin; so any
error in ground pin voltage will be multiplied at the output;
WILL BE MEASURED
LT1074?PD02
Figure 2. Proper Ground Pin Connection
FEEDBACK PIN
The feedback pin is the inverting input of an error amplifier
which controls the regulator output by adjusting duty
cycle. The noninverting input is internally connected to a
trimmed 2.21V reference. Input bias current is typically
0.5 μ A when the error amplifier is balanced (I OUT = 0). The
error amplifier has asymmetrical G M for large input sig-
nals to reduce startup overshoot. This makes the amplifier
more sensitive to large ripple voltages at the feedback pin.
100mVp-p ripple at the feedback pin will create a 14mV
offset in the amplifier, equivalent to a 0.7% output voltage
shift. To avoid output errors, output ripple (P-P) should be
less than 4% of DC output voltage at the point where the
output divider is connected.
See the “Error Amplifier” section for more details.
Frequency Shifting at the Feedback Pin
The error amplifier feedback pin (FB) is used to downshift
the oscillator frequency when the regulator output voltage
is low. This is done to guarantee that output short-circuit
sn1074 1074fds
8
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相关代理商/技术参数 |
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| LT1076MK | 制造商:Linear Technology 功能描述: |
| LT1077ACN8 | 功能描述:IC PREC OP-AMP MICRPWR SNGL 8DIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:350 V/µs 增益带宽积:180MHz -3db带宽:320MHz 电流 - 输入偏压:12.5µA 电压 - 输入偏移:800µV 电流 - 电源:15mA 电流 - 输出 / 通道:85mA 电压 - 电源，单路/双路(±):2.5 V ~ 12.6 V，±1.25 V ~ 6.3 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MSOP 包装:带卷 (TR) |
| LT1077ACN8#PBF | 功能描述:IC PREC OP-AMP MICRPWR SNGL 8DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1077AIN8 | 功能描述:IC PREC OP-AMP MICRPWR SNGL 8DIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
| LT1077AIN8#PBF | 功能描述:IC PREC OP-AMP MICRPWR SNGL 8DIP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:73 系列:Over-The-Top® 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.07 V/µs 增益带宽积:200kHz -3db带宽:- 电流 - 输入偏压:1nA 电压 - 输入偏移:285µV 电流 - 电源:50µA 电流 - 输出 / 通道:25mA 电压 - 电源，单路/双路(±):2 V ~ 44 V，±1 V ~ 22 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WFDFN 裸露焊盘 供应商设备封装:16-DFN-EP（5x3） 包装:管件 |
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