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LT3956
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at T A = 25°C. V IN = 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
SW Pin Leakage
SW Pin Current Limit
SW Pin Voltage Drop
SS Pull-Up Current
CONDITIONS
SW = 48V
I(SW) = 2A
Current Out of Pin
l
MIN
3.3
8
TYP
5
3.9
220
10
MAX
10
4.6
13
UNITS
μA
A
mV
μA
Error Amplifier
Full-Scale Current Sense Threshold ( V (ISP–ISN) )
Current Sense Threshold at CTRL = 1V ( V (ISP–ISN) )
Current Sense Threshold at CTRL = 0.5V ( V (ISP–ISN) )
Current Sense Threshold at CTRL = 0.1V ( V (ISP–ISN) )
FB = 0V, ISP = 48V, CTRL ≥ 1.2V
CTRL = 1V, FB = 0V, ISP = 48V
CTRL = 0.5V
CTRL = 0.1V, FB = 0V, ISP = 48V
l
l
l
l
240
217
96
–2.5
250
225
100
0
257
231
103
4.5
mV
mV
mV
mV
CTRL Range for Current Sense Threshold Adjustment
0
1.1
V
CTRL Input Bias Current
Current Sense Amplifier Input Common Mode
Range ( V ISN )
Current Out of Pin, CTRL = 0V
2.9
50
100
80
nA
V
ISP/ISN Short-Circuit Threshold ( V (ISP–ISN) )
ISP/ISN Short-Circuit Fault Sensing Common Mode
Range ( V ISN )
ISP/ISN Input Bias Current (Combined)
ISN = 0V
PWM = 5V (Active), ISP = ISN = 48V
PWM = 0V (Standby), ISP = ISN = 48V
300
0
335
80
0
370
3
0.1
mV
V
μA
μA
LED Current Sense Amplifier g m
120
μS
V C Output Impedance
1V < V C < 2V
15000
kΩ
V C Standby Input Bias Current
PWM = 0V
–20
20
nA
FB Regulation Voltage (V FB )
ISP = ISN = 0V, 48V
l
1.220
1.232
1.250
1.250
1.270
1.265
V
V
FB Amplifier g m
FB = V FB , ISP = ISN
480
μS
FB Pin Input Bias Current
Current Out of Pin, FB = 1V
40
100
nA
FB Voltage Loop Active Threshold
FB Overvoltage Threshold
VMODE Falling
PWMOUT Falling
V FB –
65mV
V FB + 50mV
V FB –
50mV
V FB +
60mV
V FB –
40mV
V FB +
80mV
V
V
Oscillator
Switching Frequency
R T = 100k
R T = 10k
l
90
925
100
1000
125
1050
kHz
kHz
SW Minimum Off-Time
SW Minimum On-Time
Linear Regulator
170
200
ns
ns
INTV CC Regulation Voltage
Dropout (V IN – INTV CC )
INTV CC Undervoltage Lockout
INTV CC Current Limit
INTV CC Current in Shutdown
I INTVCC = –10mA, V IN = 7V
EN/UVLO = 0V, INTV CC = 7V
l
7
14
7.15
1
4.1
17
8
7.3
4.4
25
12
V
V
V
mA
μA
3956f
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