LT3755/LT3755-1/LT3755-2
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
Tied to INTV
CC
MIN
TYP
MAX
UNITS
l
V
V
Minimum Operating Voltage
V
IN
4.5
V
IN
IN
Shutdown I
SHDN/UVLO = 0V, PWM = 0V
SHDN/UVLO = 1.15V, PWM = 0V
0.1
1
5
µA
µA
Q
V
V
V
Operating I (Not Switching)
PWM = 0V
1.4
2.00
0.006
108
40
1.7
mA
V
IN
Q
l
l
Voltage
100µA ≤ I
≤ 0µA
VREF
1.965
98
2.045
REF
REF
Line Regulation
4.5V ≤ V ≤ 40V
%/V
mV
µA
IN
SENSE Current Limit Threshold
118
13
SENSE Input Bias Current
Current Out of Pin
Current Out of Pin
SS Pull-Up Current
8
10
µA
Error Amplifier
l
l
l
l
ISP/ISN Full-Scale Current Sense Threshold
ISP/ISN Full-Scale Current Sense Threshold at CTRL = 0V
CTRL Pin Range for Current Sense Threshold Adjustment
CTRL Input Bias Current
FB = 0V, ISP = 48V
96
–12
0
100
103
–7
mV
mV
V
CTRL = 0V, FB = 0V, ISP = 48V
–9.5
1.1
100
75
Current Out of Pin
ISN = 0V
50
nA
V
LED Current Sense Amplifier Input Common Mode Range (V
ISP/ISN Short-Circuit Threshold
)
2.9
115
0
ISN
150
200
3
mV
V
ISP/ISN Short-Circuit Fault Sensing Common Mode Range (V
ISP/ISN Input Bias Current (Combined)
)
ISN
PWM = 5V (Active), ISP = ISN = 48V
PWM = 0V (Standby), ISP = ISN = 48V
55
0
µA
µA
0.1
LED Current Sense Amplifier g
VC Output Impedance
V
= 100mV
(ISP – ISN)
120
µS
kΩ
nA
m
1V < VC < 2V
PWM = 0V
15000
VC Standby Input Bias Current
–20
20
ꢀ
FB Regulation Voltage (V
)
FB
1.232
1.220
1.250
1.250
1.265
1.270
V
V
l
ISP = ISN
FB Amplifier g
FB = V , ISP = ISN
480
40
µS
nA
V
m
FB
FB Pin Input Bias Current
FB Open LED Threshold
Current Out of Pin
100
OPENLED Falling (LT3755 and LT3755-2)
V
–
V
FB
–
V
–
FB
FB
65mV
50mV
40mV
FB Overvoltage Threshold
PWMOUT Falling
V
+
V
+
V +
FB
75mV
V
FB
FB
50mV
60mV
4
V/V
VC Current Mode Gain – (∆V /∆V
)
SENSE
VC
Oscillator
l
Switching Frequency
R = 100k
T
90
925
100
1000
125
1050
kHz
kHz
T
R = 10k
Minimum Off-Time
170
ns
37551fd
ꢂ
LINEAR_DIMENSIONS [ Linear Dimensions ]
