LT3598 Просмотр технического описания (PDF) - Linear Technology
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LT3598 Datasheet PDF : 24 Pages
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LT3598
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = VIN unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Voltage
3
3.2
V
Maximum Operating Voltage
30
V
Reference Voltage
Reference Voltage Line Regulation
Maximum VREF Pin Current
FB Pin Bias Current
FB Error Amp Transconductance
3.2V < VIN < 30V, VC = 0.3V
Out of Pin
VFB = 1.230V (Note 3)
ΔI = 5μA
1.216
l 1.210
200
1.230
0.01
100
300
1.260
1.260
0.03
250
V
V
%/V
μA
nA
μmhos
FB Error Amp Voltage Gain
600
V/V
FB Pin Voltage
1.22 1.24 1.26
V
Current Loop Amp Transconductance
21
μmhos
Current Loop Amp Voltage Gain
80
V/V
VC Sink Current
Quiescent Current
Quiescent Current in Shutdown
ISET Voltage
LED Current
LED String Current Matching
VSHDN = 5V, PWM = 0V, Not Switching
VSHDN = 0V
VCTRL = 1.5V, VTSET = 1.5V, RISET = 14.7kΩ
RISET = 14.7kΩ
20mA LED Current
10
μA
3.5
5
mA
0
1
μA
0.985 1.000 1.015
V
19.5
20
20.7
mA
l
±0.5 ±1.5
%
LED Open Detection Threshold
OPENLED Sink Current
0.2
0.25
V
2
mA
Minimum LED Regulation Voltage
0.8
V
LED1-6 Leakage Current
CTRL Pin Bias Current
Switching Frequency
VLED1-6 = 1V, VOUT = 5V, PWM = 0V
VLED1-6 = 42V, VOUT = 44V, PWM = 0V
VCTRL = 0.8V (Note 4)
RT = 309kΩ
RT = 51.1kΩ
RT = 14.7kΩ
0.1
1
μA
0.2
2
μA
50
125
nA
171
190
209
kHz
0.9
1
1.1
MHz
2.25
2.5
2.75
MHz
TSET Voltage
Maximum Switch Duty Cycle
RT = 309kΩ
RT = 51.1kΩ
RT = 14.7kΩ
602
mV
90
95
%
l 87
90
%
80
86
%
Switch Current Limit
(Note 5)
1.5
2
2.5
A
Switch VCESAT
Switch Leakage Current
ISW = 0.5A
VSW = 40V
0.12
V
0.2
5
μA
3598fb
3
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