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LT3474 Datasheet(PDF) 4 Page - Analog Devices

Part # LT3474
Description  40VIN, 75VOUT LED Controllers
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3474 Datasheet(HTML) 4 Page - Analog Devices

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LT3755/LT3755-1/LT3755-2
4
Rev. E
For more information www.analog.com
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
MIN
TYP
MAX
UNITS
LED Current Sense Amplifier gm
V(ISP – ISN) = 100mV
120
µS
VC Output Impedance
1V < VC < 2V
15000
kΩ
VC Standby Input Bias Current
PWM = 0V
–20
20
nA
FB Regulation Voltage (VFB)
ISP = ISN
J-Grade
l
l
1.232
1.220
1.215
1.250
1.250
1.250
1.265
1.270
1.275
V
V
V
FB Amplifier gm
FB = VFB, ISP = ISN
480
µS
FB Pin Input Bias Current
Current Out of Pin
40
100
nA
FB Open LED Threshold
OPENLED Falling (LT3755 and LT3755-2)
VFB –
65mV
VFB –
50mV
VFB –
40mV
V
FB Overvoltage Threshold
PWMOUT Falling
VFB +
50mV
VFB +
60mV
VFB +
75mV
V
VC Current Mode Gain – (∆VVC/∆VSENSE)
4
V/V
Oscillator
Switching Frequency
RT = 100k
RT = 10k
l
90
925
100
1000
125
1050
kHz
kHz
Minimum Off-Time
170
ns
Linear Regulator
INTVCC Regulation Voltage
7
7.15
7.3
V
Dropout (VIN – INTVCC)
IINTVCC = –10mA, VIN = 7V
350
mV
INTVCC Undervoltage Lockout
3.9
4.1
4.3
V
INTVCC Current Limit
29
34
40
mA
INTVCC Current in Shutdown
SHDN/UVLO = 0V, INTVCC = 7V
8
12
µA
Logic Inputs/Outputs
PWM Input High Voltage
l
1.5
V
PWM Input Low Voltage
l
0.4
V
PWM Pin Resistance to GND
45
60
kΩ
PWMOUT Output Low (VOL)
0
50
mV
PWMOUT Output High (VOH)
INTVCC –
0.05
V
SHDN/UVLO Threshold Voltage Falling
E-, I-Grades
H-Grade
J-Grade
l
l
l
1.185
1.175
1.159
1.220
1.245
1.245
1.260
V
V
V
SHDN/UVLO Rising Hysteresis
20
mV
SHDN/UVLO Input Low Voltage
IVIN Drops Below 1µA
0.4
V
SHDN/UVLO Pin Bias Current Low
SHDN/UVLO = 1.15V
1.7
2.05
2.5
µA
SHDN/UVLO Pin Bias Current High
SHDN/UVLO = 1.30V
10
100
nA
OPENLED Output Low (VOL)
IOPENLED = 0.5mA (LT3755 and LT3755-2)
200
mV
SYNC Pin Resistance to GND
LT3755-1 Only
30
kΩ
SYNC Input High
LT3755-1 Only
1.5
V
SYNC Input Low
LT3755-1 Only
0.4
V



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