(Note 2).................................................. –40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 125°C
MS PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 130°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT3519EMS#PBF
LT3519IMS#PBF
TAPE AND REEL
LT3519EMS#TRPBF
LT3519IMS#TRPBF
PART MARKING*
3519
3519
PACKAGE DESCRIPTION
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Operating Voltage Range
V
IN
Supply Current
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V,
SHDN/UVLO
= 12V, CTRL = 2V, PWM = 5V,
unless otherwise noted.
CONDITIONS
Continuous Operation (Note 3)
SHDN/UVLO
= 0V
(Shutdown)
PWM = 0V
(Idle)
PWM > 1.5V, FB = 1.5V (Active, Not Switching)
ISP = 24V, CTRL = 2V
ISP = 0V, CTRL = 2V
ISP = 24V, CTRL = 100mV
2.5V < ISP < 45V
400kHz (LT3519)
400kHz (LT3519)
l
l
l
MIN
3
TYP
0.1
2.0
2.5
MAX
30
UNITS
V
μA
mA
mA
Current Sense Voltage (V
ISP
-V
ISN
)
Zero Current Sense Voltage (V
ISP
-V
ISN
)
Current Sense Voltage Line Regulation
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
Switch V
CESAT
240
–12
320
94
750
250
250
–6
0.02
400
97
980
300
260
0
440
1150
mV
mV
mV
%/V
kHz
%
mA
mV
I
SW
= 500mA
3519f
2
LT3519
ELECTRICAL CHARACTERISTICS
PARAMETER
Switch Leakage Current
CTRL for Full-Scale LED Current
CTRL Pin Bias Current
PWM Input High Voltage
PWM Input Low Voltage
PWM Pin Resistance to GND
FB Regulation Voltage (V
FB
)
FB Pin Threshold Voltage for
OPENLED
Falling
FB Pin Bias Current
ISP , ISN Idle Input Bias Current
ISP , ISN Full-Scale Input Bias Current
Schottky Forward Drop
Schottky Leakage Current
SHDN/UVLO
Threshold Voltage Falling
SHDN/UVLO
Input Low Voltage
SHDN/UVLO
Pin Bias Current Low
SHDN/UVLO
Pin Bias Current High
V
REF
Output Voltage
V
REF
Output Pin Regulation
OPENLED
Output Low (V
OL
)
OPENLED
Leakage Current
I
VIN
Drops Below 1μA
SHDN/UVLO
= 1.15V
SHDN/UVLO
= 1.30V
–100μA ≤ I
VREF
≤ 0μA
3V < V
IN
< 40V
I
OPENLED
= 1mA
FB = 0V,
OPENLED
= 40V
l
l
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V,
SHDN/UVLO
= 12V, CTRL = 2V, PWM = 5V,
unless otherwise noted.
CONDITIONS
SW = 45V, PWM = 0V
1.2
Current Out of Pin, CTRL = 0.1V
1.5
0.4
70
1.190
1.220
V
FB
– 60mV
Current Out of Pin, FB = 1V
PWM = 0V
ISP = ISN = 24V
I
SCHOTTKY
= 500mA
CATHODE = 24V, ANODE = 0V
l
MIN
TYP
MAX
2
UNITS
μA
V
nA
V
V
kΩ
V
V
nA
μA
μA
V
50
100
1.250
120
1
60
17
0.8
4
1.180
1.8
1.96
1.220
2.2
10
2
1.270
0.4
2.6
100
2.04
0.04
240
1
μA
V
V
μA
nA
V
%/V
mV
μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2.
The LT3519E is guaranteed to meet specified performance
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization and
correlation with statistical process controls. The LT3519I is guaranteed
to meet performance specifications over the –40°C to 125°C operating
temperature range.
Note 3.
Absolute maximum voltage at V
IN
and
OPENLED
is 40V for
nonrepetitive one second transients and 30V for continuous operation.
请问如何解决这个问题
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//
// Use of this source code is subject to the terms of the Microsoft end-user
// li ......
在电能源的使用中，照明用电占据了相当大的比例，我们现在常用的日光灯、节能灯等灯具，较之早先的普通白炽灯，在发光效率上有了很大提高，得到了广泛的应用。随着制造工艺水平的不断提高，LED（发光二极管）也被广泛用于各种照明领域。 LED 具有更高的发光效率，更低的耗电量，使用寿命也更长，在城市亮灯工程和家居照明当中起到了非常好的效果。在当前能源紧缺的环境下，LED 节能技术将成为一项很重要的...[详细]
DSP 与 ARM 处理器
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