LT3796 Просмотр технического описания (PDF) - Linear Technology
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LT3796
Linear Technology
LT3796 Datasheet PDF : 32 Pages
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LT3796
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, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
VIN Minimum Operating Voltage
VIN Shutdown IQ
VIN Tied to INTVCC
EN/UVLO = 0V, PWM = 0V
EN/UVLO = 1.15V, PWM = 0V
6
V
1
µA
12
µA
VIN Operating IQ (Not Switching)
VREF Voltage
VREF Pin Line Regulation
VREF Pin Load Regulation
SENSE Current Limit Threshold
RT = 82.5k to GND, FB1 = 1.5V
–100µA ≤ IREF ≤ 10µA
6V < VIN < 100V
–100µA < IREF < 0µA
l 1.97
l
100
2.5
2.015
1.5
10
113
3
mA
2.06
V
m%/V
m%/µA
125
mV
SENSE Input Bias Current
Current Out of Pin
60
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, CTRL ≥ 1.2V
ISP = 0V, CTRL ≥ 1.2V
l
243
250
257
mV
l
243
250
257
mV
9/10th LED Current Sense Threshold
(V(ISP-ISN))
CTRL = 1V, ISP = 48V
CTRL = 1V, ISP = 0V
l
220
225
230
mV
l
220
225
230
mV
1/2 LED Current Sense Threshold
(V(ISP-ISN))
CTRL = 0.6V, ISP = 48V
CTRL = 0.6V, ISP = 0V
l
119
125
131
mV
l
119
125
131
mV
1/10th LED Current Sense Threshold
(V(ISP-ISN))
CTRL = 0.2V, ISP = 48V
CTRL = 0.2V, ISP = 0V
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 Over Current Protection Threshold ISN = 48V
(V(ISP-ISN))
ISN = 0V
l
360
375
390
mV
l
360
375
390
mV
CTRL Input Bias Current
Current Out of Pin, CTRL = 1.2V
50
200
nA
ISP/ISN Current Sense Amplifier Input
Common Mode Range
0
100
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
FB1, FB2 Regulation Voltage (VFB)
V(ISP-ISN) = 250mV
PWM = 0V
ISP = ISN = 48V
ISP = ISN = 48V
400
µs
2000
kΩ
–20
20
nA
l 1.230
1.250
1.270
V
1.238
1.250
1.264
V
FB1 Amplifier gm
FB2 Amplifier gm
FB1, FB2 Pin Input Bias Current
FB1 Open LED Threshold
C/10 Comparator Threshold (V(ISP-ISN))
FB = VFB
VMODE Falling, ISP = ISN = 48V
VMODE Falling, FB1 = 1.5V, ISP = 48V
VMODE Falling, FB1 = 1.5V, ISN = 0V
800
1000
1200
µS
130
170
210
µS
100
200
nA
VFB – 70mV VFB – 60mV VFB – 50mV
V
25
mV
25
mV
FB1 Overvoltage Threshold
FB2 Overvoltage Threshold
VC Current Mode Gain (∆VVC/∆VSENSE)
FAULT Falling
TG Rising
VFB + 35mV VFB + 50mV VFB + 60mV
V
VFB + 35mV VFB + 50mV VFB + 60mV
V
4.2
V/V
3796f
3
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