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LT3477 Datasheet(PDF) 3 Page - Analog Devices

Part # LT3477
Description  60V, 1.5A LED Driver with Internal Exponential Scale Dimming
PDF  26 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3477 Datasheet(HTML) 3 Page - Analog Devices

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LT3950
3
Rev. 0
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Range
l
3
60
V
Input (VIN) Quiescent Current
VFB = 1.25V, Not Switching
1.8
mA
Input (VIN) Shutdown Current
EN/UVLO = 0V
EN/UVLO = 0.9V, CTRL = 0V
0
130
1
200
µA
µA
EN/UVLO Shutdown Threshold (Falling)
l
1.15
1.25
1.35
V
EN/UVLO Rising Hysteresis
EN/UVLO Rising
32
mV
EN/UVLO Input Low Voltage
IVIN < 1µA
0.4
V
EN/UVLO Pin Current (Device Off)
EN/UVLO = 1.2V
2
µA
EN/UVLO Pin Current (Device On)
EN/UVLO = 1.35V
0
µA
Internal LDO Regulator
Internal Regulator Voltage
Not Switching, 1mA External Load
l
2.94
3
3.06
V
Line Regulation
Not Switching, 3.3V < VIN < 60V
0.025
%/V
Load Regulation
Not Switching, 0.1mA < ILOAD <10mA
0.05
%/mA
Max. Output Current
Not Switching, INTVCC = 2.8V
20
mA
Dropout Voltage
Not Switching, INTVCC Droop 1%, ILOAD = 10mA
350
mV
LED Current Regulation (Note 4)
ISP Common Mode Voltage Range
l
4
60
V
Current Sense Threshold (VISP – VISN)
CTRL = 1.5V (100%)
CTRL = 0.7V (50%)
CTRL = 0.3V (10%)
l
l
l
248
121
20
250
125
25
255
129
30
mV
mV
mV
Current Sense Threshold (VISP – VISN) at GND
ISP = 0V
85
mV
CTRL OFF Threshold (Falling)
l
85
100
125
mV
CTRL OFF Hysteresis
35
mV
CTRL Pin Current
–100
100
nA
ISP, ISN Pin Current (Combined)
CTRL = 1.5V (Full Scale)
CTRL = 0V (Stopped)
450
5
0.1
µA
µA
Error Amp Transconductance
60
µS
Error Amp Output Resistance
20
MΩ
LED Voltage Regulation (Note 4)
FB Regulation Threshold (VFB)
l
1.188
1.176
1.2
1.2
1.212
1.224
V
V
FB Pin Current
Current Out of Pin
20
100
nA
ISP Voltage Regulation Threshold
60
V
FB Amplifier Transconductance
500
µS
FB Amplifier Output Resistance
20
MΩ
Oscillator
Programmed Switching Frequency (fSW)
RT = 45.3k SYNC/SPRD = 0V
RT = 402k SYNC/SPRD = 0V
l
l
1880
276
2000
300
2120
324
kHz
kHz
Spread Spectrum Modulation Depth
SYNC/SPRD = 3V
25
%
Minimum Off Time
l
35
55
75
ns
Minimum On Time
45
ns
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Unless otherwise noted, VIN = EN/UVLO = 12V, FAULT = 100kΩ to 12V,
ISP = ISN = 48V, SYNC/SPRD = 0V, CTRL = 1.5V, PWM = 3V, INTVCC = 1μF to GND, RT = 45.3kΩ to GND, RP = 100kΩ to GND, FB = 1V.



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