lt3755-2 Linear Technology Corporation, lt3755-2 Datasheet - Page 3

• Manufacturer Part Number: lt3755-2
• Description: Lt3755/lt3755-1/lt3755-2 40vin, 75vout Led Controllers Features
• Manufacturer: Linear Technology Corporation

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

%/V
kHz
kHz
V/V
mA
mV
mV
mV
mV
kΩ
µA
µA
µA
µA
nA
µA
µA
µS
nA
µS
nA
ns
V
V
V
V
V
V
V
V
V