Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
2940f
2
LT2940
ELECTRICAL CHARACTERISTICS
SYMBOL
Supply
V
CC
I
CC
V
CC(UVLC)
ΔV
CC(HYST)
Voltage Sense
V
VSEN(OR)
Voltage Sense Pin Operating Range
V
+
Pin and V
–
Pin
V
V
V
CC
≤ 12V
12V < V
CC
< 30V
V
CC
≥ 30V
Voltage Sense Differential Input Voltage Range V
CC
< 11V
(Note 5)
V
V
= V
V
+
– V
V
–
V
V(CL)
I
VSEN
ΔI
VSEN
Current Sense
V
ISEN(OR)
V
I
Current Sense Pin Operating Range
I
+
Pin and I
–
Pin
Current Sense Differential Input Voltage
Range (Note 6)
V
I
= V
I
+
– V
I
–
Current Sense Differential Clipping Limit
(Note 6)
Current Sense Input Bias Current
I
+
Pin and I
–
Pin
Current Sense Input Offset Current
ΔI
ISEN
= I
I
+
– I
I
–
Power Monitor Output Current Operating
Range
Power Monitor Output Current Capability
V
CC
≥ 12V, V
PMON
≥ 0V, and
V
V
= –9V, V
I
= –225mV, or
V
V
= 9V, V
I
= 225mV
V
CC
≥ 12V, V
PMON
≥ 0.5V, and
V
V
= –9V, V
I
= 225mV, or
V
V
= 9V, V
I
= –225mV
V
CC
≥ 12V, V
PMON
≥ 4V, and
V
V
= –9V, V
I
= 225mV, or
V
V
= 9V, V
I
= –225mV
V
I
+
= V
I
–
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. All specifications apply at 6V ≤ V
CC
≤ 80V, unless otherwise specified.
PARAMETER
Supply Voltage Operating Range
Supply Current
Supply Undervoltage Latch Clear
Supply Undervoltage Hysteresis
I
PMON
= +200μA, I
IMON
= +200μA
(Note 2)
V
CC
Falling
V
CC
Rising
CONDITIONS
l
l
l
l
MIN
6
2
2.3
20
–0.1
–0.1
–0.1
±(V
CC
– 3)
±8
±9
–300
TYP
MAX
80
UNITS
V
mA
V
mV
V
V
V
V
V
V
3.5
2.5
75
5
2.7
100
V
CC
– 3
9
18
V
CC
≥ 11V
V
CC
≥ 12V
Voltage Sense Differential Clipping Limit
(Note 5)
Voltage Sense Input Bias Current
V
+
Pin and V
–
Pin
Voltage Sense Input Offset Current
ΔI
VSEN
= I
V
+
– I
V
–
–100
±50
100
±150
nA
nA
V
V
+
= V
V
–
l
4
±200
80
V
mV
V
I(CL)
I
ISEN
ΔI
ISEN
l
l
l
±225
75
100
±200
125
±800
mV
μA
nA
Power Monitor (Note 2)
I
PMON(OR)
I
PMON(CAPA)
l
l
±200
900
1200
μA
μA
l
–240
–1200
μA
l
–800
–1200
μA
2940f
3
LT2940
ELECTRICAL CHARACTERISTICS
SYMBOL
V
PMON
PARAMETER
Power Monitor Output Compliance Voltage
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. All specifications apply at 6V ≤ V
CC
≤ 80V, unless otherwise specified.
CONDITIONS
V
CC
≤ 12V, I
PMON
≥ 0μA
12V < V
CC
< 30V, I
PMON
≥ 0μA
V
CC
≥ 30V, I
PMON
≥ 0μA
V
CC
≤ 12V, I
PMON
< 0μA
12V < V
CC
< 30V, I
PMON
< 0μA
V
CC
≥ 30V, I
PMON
< 0μA
l
l
l
l
l
l
MIN
0
0
0
0.5
0.5
0.5
TYP
MAX
V
CC
– 4.5
7.5
12
V
CC
– 4.5
7.5
12
UNITS
V
V
V
V
V
V
%FS
%FS
%FS
%FS
%FS
μA /V
2
mV
mV
μA
MHz
μA
E
PMON
Power Monitor Output Total Error (Note 4)
|V
V
• V
I
| ≤ 0.4V
2
|V
V
• V
I
| ≤ 0.4V
2
, 25°C < T
A
≤ 85°C
|V
V
• V
I
| ≤ 0.4V
2
, LT2940C
|V
V
• V
I
| ≤ 0.4V
2
, LT2940I
Quadrants I and III of Shaded Region
in Figure 4
l
l
l
l
l
l
l
±2
±2.5
±2.5
±3.5
±5
485
500
±40
±2
±6
0.5
l
±5
±7
±9
±12
±15
515
±100
±6
±15
K
PMON
V
V(OSP)
V
I(OSP)
I
PMON(OS)
BW
PMON
I
IMON(FS)
V
IMON
Power Monitor Scaling Coefficient
I
PMON
= K
PMON
• V
V
• V
I
Power Monitor Voltage Sense Input-Referred
Offset Voltage
Power Monitor Current Sense Input-Referred
Offset Voltage
Power Monitor Output Offset Current
Power Monitor Output Bandwidth
Current Monitor Output Current Operating
Range
Current Monitor Output Compliance Voltage
|V
V
• V
I
| = 0.4V
2
V
V
= 0V
V
I
= 0mV
V
V
–
= 0V, V
I
= 0mV
R
PMON
= 2k
Current Monitor (Note 2)
±200
0
0
0
0.5
0.5
0.5
±1.5
l
l
l
l
l
V
CC
≤ 12V, I
IMON
≥ 0μA
12V < V
CC
< 30V, I
IMON
≥ 0μA
V
CC
≥ 30V, I
IMON
≥ 0μA
V
CC
≤ 12V, I
IMON
< 0μA
12V < V
CC
< 30V, I
PMON
< 0μA
V
CC
≥ 30V, I
PMON
< 0μA
l
l
l
l
l
l
V
CC
– 4.5
7.5
12
V
CC
– 4.5
7.5
12
±3
±3.5
±4
±5
1025
±7
±2
±2
±2.5
V
V
V
V
V
V
%FS
%FS
%FS
%FS
μA /V
mV
MHz
E
IMON
Current Monitor Output Total Error (Note 4)
|V
I
| ≤ 200mV, 25°C ≤ T
A
≤ 85°C
|V
I
| ≤ 200mV, LT2940C
|V
I
| ≤ 200mV, LT2940I
200mV < |V
I
| ≤ 225mV
G
IMON
V
I(OSI)
BW
IMON
Comparator
V
CMP(TH)
ΔV
CMP(HYST)
I
CMP(BIAS)
I
CMPOUT(OL)
Current Monitor Scaling, I
IMON
= G
IMON
• V
I
Current Monitor Current Sense Input-Referred
Offset Voltage
Current Monitor Output Bandwidth
Comparator Threshold Voltage
Comparator Threshold Hysteresis
Comparator Input Bias Current
CMPOUT Output Low Voltage
V
I
= ±200mV
975
1000
±2.5
1
R
IMON
= 2k
CMP
+
Rising
CMP
+
Falling
1V ≤ V
CMP+
≤ 1.5V
CMP
+
High, I
CMPOUT
= 3mA
l
l
l
l
1.222
–15
1.240
–35
±100
0.2
1.258
–60
±300
0.4
V
mV
nA
V
2940f
4
LT2940
ELECTRICAL CHARACTERISTICS
SYMBOL
I
CMPOUT(LK)
I
CMPOUT(OL)
I
CMPOUT(LK)
t
DLY
V
LATCH(IL)
V
LATCH(IO)
V
LATCH(IH)
I
LATCH(LK)
I
LATCH(BIAS)
PARAMETER
CMPOUT Leakage Current
CMPOUT
Output Low Voltage
CMPOUT
Leakage Current
Comparator Propagation Delay
LATCH Input Low Voltage
LATCH Input Open Voltage
LATCH Input High Voltage
LATCH Input Allowable Leakage in
Open State
LATCH Input Bias Current
V
LATCH
= 0V
V
LATCH
= 80V
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:
All currents into pins are positive, and all voltages are referenced
to GND unless otherwise noted. Current sourced by the PMON pin or the
IMON pin is defined as positive; current sunk as negative.
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. All specifications apply at 6V ≤ V
CC
≤ 80V, unless otherwise specified.
CONDITIONS
CMP
+
Low, V
CC
= 36V,
0.4V ≤ V
CMPOUT
≤ 36V
CMP
+
Low, I
CMPOUT
= 3mA
CMP
+
High, V
CC
= 36V,
0.4V ≤ V
CMPOUT
≤ 36V
Output Pulling Down
l
l
l
l
l
l
l
l
l
l
MIN
TYP
±0.15
0.2
±0.15
0.7
MAX
±1
0.4
±1
2
1.2
1.95
2.5
±10
UNITS
μA
V
μA
μs
V
V
V
μA
μA
μA
0.5
1.25
2.0
0.8
1.5
2.2
–11
11
–17
17
–23
23
Note 3:
The LT2940 may safely drive its own PMON and IMON output
voltages above the absolute maximum ratings. Do not apply any external
source that drives the voltage above absolute maximum.
Note 4:
Full-scale equals ±200μA.
Note 5:
V
+
and V
–
pin voltages must each fall within the voltage sense pin
operating range specification.
Note 6:
I
+
and I
–
pin voltages must each fall within the current sense pin
白光LED光衰原因之荧光粉性能的衰退 到目前，白光 LED、尤其是小功率白光 LED 的发光性能快速衰退已越来越为人们所认识。其实，盲目地夸大宣传，只能将 LED 行业引向歧途，不正视白光 LED 存在的问题，只能延缓白光 LED 应用的发展。只有正视问题、研究问题、尽早解决问题，白光 LED 才能健康、快速发展。 白光 LED 当前面临的一个主要问题就寿命问题。由于白光 LED 的价格尚很...[详细]
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