参数资料
| 型号： | LTC6257IMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP QUAD 6.5MHZ 16MSOP |
| 标准包装： | 37 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 1.8 V/µs |
| 增益带宽积： | 6.5MHz |
| -3db带宽： | 4.5MHz |
| 电流 - 输入偏压： | 5nA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 65µA |
| 电流 - 输出 / 通道： | 35mA |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 16-MSOP |
| 包装： | 管件 |
LTC6255/LTC6256/LTC6257
16
625567fb
Figure 5
–
+
VOUT
625567 F05
LTC6255
4
1
C2
3
6
VIN
C1
R3
V+
R1
R2
0.1F
SHDN
2
5
100k
10F
typicAl ApplicAtions
RC Component Equations
R2
=
1
1
4 Q2 Gain + 1
[
]C2
C1
4
π Q fO C2
R3
=
1
4
π2 R2 C1 C2 fO
2
Gain
=
R2
R1
=
R2
Gain
C1
> 4 Q2 Gain + 1
(
)C2
Maximum f–3dB = 100kHz and
Maximum Gain
=
100kHz
f–3dB
Table 1.
fO AND Q VALUES
2nd Order Lowpass
Butterworth
fO = f–3dB
Q = 0.707
Bessel
fO = 1.274 f–3dB
Q = 0.577
4th Order Lowpass
Butterworth
fO = f–3dB
Q = 0.541
Q = 1.307
Bessel
fO = 1.419 f–3dB
fO = 1.591 f–3dB
Q = 0.522
Q = 0.806
2s Rise Time Analog 1A Pulsed LED Current Driver
Figure 6 shows the LTC6255 applied as a fast, efficient
analog LED current driver. High power LEDs are used in
applications ranging from brake lights to video projectors.
MostLEDapplicationspulsetheLEDsforthebestefficiency,
and many applications take advantage of control of both
pulse width and analog current amplitude.
Inordertoextendthecircuit’sinputrangetoaccommodate
5V output DACs, the input voltage is initially divided by
50 through the R1:R2 divider. The reduced step is applied
to the LTC6255 non inverting input, and LTC6255 output
rises until MOSFETs Q1 through Q3 begin to turn on,
increasing the current in their drains and therefore the
LED. The amount of current is sensed on R3, and fed back
to the LTC6255 inverting input through R5. The loop is
compensated by R5 and C1, with R4 distancing the gate
capacitance from the op amp output for the best time
domain response. 10% to 90% rise time was measured
at 2s on a 10mA to 1A pulse. Starting at 0 current there
is an additional delay of 2.7s.
It may seem strange to use a micropower op amp in a
high current LED application, but it can be justified by the
low duty cycles encountered in LED drive applications. A
one amp LED is quite bright even when driven at 1% or
even 0.1% duty cycles and these constitute 10mA and
1mA average current levels respectively, in which case
the supply current of the op amp becomes noticeable. The
LTC6255combines6.5MHzofgain-bandwidthproductand
1.8V/μs slew rate on a supply current budget of only 65A.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6257IMS-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6.5MHz, 65??A Power Efficient Rail-to-Rail I/O Op Amps |
| LTC627A1G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LTC627A1P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| LTC627D1G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
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