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參數(shù)資料
| 型號： | LTC6257IMS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP QUAD 6.5MHZ 16MSOP |
| 標準包裝： | 2,500 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 4 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 1.8 V/µs |
| 增益帶寬積： | 6.5MHz |
| -3db帶寬： | 4.5MHz |
| 電流 - 輸入偏壓： | 5nA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 65µA |
| 電流 - 輸出 / 通道： | 35mA |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TFSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-MSOP |
| 包裝： | 帶卷 (TR) |
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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