LT3795
elecTrical characTerisTics
PARAMETER
SENSE Input Bias Current
SS Sourcing Current
SS Sinking Current
Error Amplifier
Full Scale LED Current Sense Threshold
(V
(ISP-ISN)
)
9/10th LED Current Sense Threshold
(V
(ISP-ISN)
)
1/2 LED Current Sense Threshold
(V
(ISP-ISN)
)
1/10th LED Current Sense Threshold
(V
(ISP-ISN)
)
ISP/ISN Current Monitor Voltage (V
ISMON
)
ISP/ISN Overcurrent Protection Threshold
(V
(ISP-ISN)
)
CTRL1, CTRL2 Input Bias Current
ISP/ISN Current Sense Amplifier Input
Common Mode Range
ISP/ISN Input Current Bias Current
(Combined)
ISP/ISN Current Sense Amplifier g
m
V
C
Output Impedance
V
C
Standby Input Bias Current
FB Regulation Voltage (V
FB
)
FB Amplifier g
m
FB Pin Input Bias Current
FB Open LED Threshold
C/10 Comparator Threshold (V
(ISP-ISN)
)
FB Overvoltage Threshold
V
C
Current Mode Gain (∆V
VC
/∆V
SENSE
)
FB
SHORTLED
Threshold
V
C
Pin Source Current
V
C
Pin Sink Current
Input Current Sense Amplifier
Input Current Sense Amplifier Input Voltage
Common Range (V
IVINP
/V
IVINN
)
Input Current Sense Threshold
(V
IVINP
- V
IVINN
)
Input Current Monitor V(IVINCOMP)
Input Bias Current (I(IVINN))
Input Current Sense Amplifier g
m
IVINCOMP Pin Resistance to GND
V
IVINP
= 48V, V
IN
= 48V
V
IVINP
-V
IVINN
= 50mV
V
IVINP
-V
IVINN
= 50mV
V
IVINP
-V
IVINN
= 60mV
l
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
= 24V, EN/UVLO = 24V, CTRL1 = CTRL2 = 2V, PWM = 5V, unless otherwise noted.
CONDITIONS
Current Out of Pin
SS = 0V
ISP – ISN = 1V, SS = 2V
ISP = 48V, CTRL1 ≥ 1.2V, CTRL2 ≥ 1.2V
ISP = 0V, CTRL1 ≥ 1.2V, CTRL2 ≥ 1.2V
ISP = 48V, CTRL1 = 1V, CTRL2 = 1.2V
ISP = 0V, CTRL1 = 1V, CTRL2 = 1.2V
ISP = 48V, CTRL1 = 0.6V, CTRL2 = 1.2V
ISP = 0V, CTRL1 = 0.6V, CTRL2 = 1.2V
ISP = 48V, CTRL1 = 0.2V, CTRL2 = 1.2V
ISP = 0V, CTRL1 = 0.2V, CTRL2 = 1.2V
V
(ISP-ISN)
= 250mV, ISP = 48V, –50µA ≤ I
ISMON
≤ 0 µA
V
(ISP-ISN)
= 250mV, ISP = 0V, –50µA ≤ I
ISMON
≤ 0 µA
ISN = 48V
ISN = 0V
Current Out of Pin, CTRL = 1V
0
PWM = 5V (Active), ISP = 48V
PWM = 0V (Standby), ISP = 48V
V
(ISP-ISN)
= 250mV
PWM = 0V
ISP = ISN = 48V
ISP = ISN = 48V
Current Out of Pin, FB = V
FB
OPENLED
Falling, ISP = ISN = 48V
OPENLED
Falling, FB = 1.25V, ISP = 48V
OPENLED
Falling, FB = 1.25V, ISN = 0V
TG Rising
SHORTLED
Falling
V
C
= 1.2V
V
C
= 1.2V, FB = 1.4V
2.5
57
0.94
60
1
100
3400
1
15
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
TYP
65
28
2.8
MAX
UNITS
µA
µA
µA
243
243
220
220
119
119
16
16
0.96
0.96
360
360
250
250
225
225
125
125
25
25
1
1
375
375
50
257
257
230
230
130
130
32
32
1.04
1.04
390
390
200
110
mV
mV
mV
mV
mV
mV
mV
mV
V
V
mV
mV
nA
V
µA
µA
µS
kΩ
700
0
350
2000
–20
1.230
1.238
1.250
1.250
600
40
25
25
0.1
20
1.270
1.264
200
nA
V
V
µS
nA
V
mV
mV
V
V/V
mV
µA
µA
V
FB
– 62mV V
FB
– 52mV V
FB
– 42mV
V
FB
+ 35mV V
FB
+ 50mV V
FB
+ 60mV
4.2
300
10
30
110
63
1.06
1000
350
V
mV
V
nA
µS
µs
kΩ
3795f
Input Step Response (to 50% of Output Step) ∆V
SENSE
= 60mV Step
For more information
3
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
