LT3795 Просмотр технического описания (PDF) - Linear Technology
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LT3795 Datasheet PDF : 30 Pages
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LT3795
Electrical Characteristics The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C, VIN = 24V, EN/UVLO = 24V, CTRL1 = CTRL2 = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
SENSE Input Bias Current
Current Out of Pin
65
µA
SS Sourcing Current
SS = 0V
28
µA
SS Sinking Current
ISP – ISN = 1V, SS = 2V
2.8
µA
Error Amplifier
Full Scale LED Current Sense Threshold
(V(ISP-ISN))
ISP = 48V, CTRL1 ≥ 1.2V, CTRL2 ≥ 1.2V
ISP = 0V, CTRL1 ≥ 1.2V, CTRL2 ≥ 1.2V
l
243
250
257
mV
l
243
250
257
mV
9/10th LED Current Sense Threshold
(V(ISP-ISN))
ISP = 48V, CTRL1 = 1V, CTRL2 = 1.2V
ISP = 0V, CTRL1 = 1V, CTRL2 = 1.2V
l
220
225
230
mV
l
220
225
230
mV
1/2 LED Current Sense Threshold
(V(ISP-ISN))
ISP = 48V, CTRL1 = 0.6V, CTRL2 = 1.2V
ISP = 0V, CTRL1 = 0.6V, CTRL2 = 1.2V
l
119
125
130
mV
l
119
125
130
mV
1/10th LED Current Sense Threshold
(V(ISP-ISN))
ISP = 48V, CTRL1 = 0.2V, CTRL2 = 1.2V
ISP = 0V, CTRL1 = 0.2V, CTRL2 = 1.2V
l
16
l
16
25
32
mV
25
32
mV
ISP/ISN Current Monitor Voltage (VISMON) V(ISP-ISN) = 250mV, ISP = 48V, –50µA ≤ IISMON ≤ 0 µA l
0.96
1
1.04
V
V(ISP-ISN) = 250mV, ISP = 0V, –50µA ≤ IISMON ≤ 0 µA l
0.96
1
1.04
V
ISP/ISN Overcurrent Protection Threshold
(V(ISP-ISN))
ISN = 48V
ISN = 0V
l
360
375
390
mV
l
360
375
390
mV
CTRL1, CTRL2 Input Bias Current
Current Out of Pin, CTRL = 1V
50
200
nA
ISP/ISN Current Sense Amplifier Input
Common Mode Range
0
110
V
ISP/ISN Input Current Bias Current
(Combined)
PWM = 5V (Active), ISP = 48V
PWM = 0V (Standby), ISP = 48V
700
µA
0
0.1
µA
ISP/ISN Current Sense Amplifier gm
VC Output Impedance
VC Standby Input Bias Current
FB Regulation Voltage (VFB)
V(ISP-ISN) = 250mV
PWM = 0V
ISP = ISN = 48V
ISP = ISN = 48V
350
µS
2000
kΩ
–20
20
nA
l 1.230
1.250
1.270
V
1.238
1.250
1.264
V
FB Amplifier gm
FB Pin Input Bias Current
FB Open LED Threshold
C/10 Comparator Threshold (V(ISP-ISN))
Current Out of Pin, FB = VFB
OPENLED Falling, ISP = ISN = 48V
OPENLED Falling, FB = 1.25V, ISP = 48V
OPENLED Falling, FB = 1.25V, ISN = 0V
600
µS
40
200
nA
VFB – 62mV VFB – 52mV VFB – 42mV
V
25
mV
25
mV
FB Overvoltage Threshold
VC Current Mode Gain (∆VVC/∆VSENSE)
FB SHORTLED Threshold
TG Rising
SHORTLED Falling
VFB + 35mV VFB + 50mV VFB + 60mV
V
4.2
V/V
l
300
350
mV
VC Pin Source Current
VC Pin Sink Current
Input Current Sense Amplifier
VC = 1.2V
VC = 1.2V, FB = 1.4V
10
µA
30
µA
Input Current Sense Amplifier Input Voltage
Common Range (VIVINP/VIVINN)
Input Current Sense Threshold
(VIVINP - VIVINN)
Input Current Monitor V(IVINCOMP)
VIVINP = 48V, VIN = 48V
VIVINP-VIVINN = 50mV, VIN = 48V
l
2.5
l
57
l 0.94
110
V
60
63
mV
1
1.06
V
Input Bias Current (I(IVINN))
VIVINP-VIVINN = 50mV, VIN = 48V
100
1000
nA
Input Current Sense Amplifier gm
VIVINP-VIVINN = 60mV, VIN = 48V
Input Step Response (to 50% of Output Step) ∆VSENSE = 60mV Step, VIN = 48V
IVINCOMP Pin Resistance to GND
VIN = 48V
3400
µS
1
µs
15
kΩ
For more information www.linear.com/LT3795
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