LT3518 Просмотр технического описания (PDF) - Analog Devices
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LT3518 Datasheet PDF : 20 Pages
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LT3518
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 5V, SHDN = 5V, PWM = 5V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum VIN Operating Voltage
Maximum VIN Operating Voltage
Current Sense Voltage (VISP – VISN)
10% Scale Current Sense Voltage (VISP – VISN)
Current Sense Voltage Line Regulation
VIN Supply Current
Continuous Operation (Note 3)
VCTRL = 2V, VISP = 24V, VC = 1V
VCTRL = 2V, VISP = 0V, VC = 1V
VCTRL = 100mV, VISP = 24V, VC = 1V
2V < VISP < 45V
PWM > 1.5V, VC = 0V
PWM = 0V
SHDN = 0V
3
V
30
V
l 96
100
103
mV
100
mV
9
mV
0.03
%/V
6
10
mA
4.5
mA
0.1
1
µA
Switching Frequency
RT Voltage
Soft-Start Pin Current
RT = 16.7k
RT = 4.03k
RT = 91.5k
SS = 0.5V, Out of Pin
l 0.85
1.0
1.15
MHz
2.25
2.5
2.7
MHz
220
250
270
kHz
1
V
6
9
12
µA
SYNC Pull-Down Current (Into the Pin)
SYNC Input Low
VSYNC = 2V
60
µA
0.4
V
SYNC Input High
1.5
V
Maximum Duty Cycle
Switch Current Limit
RT = 91.5k (250kHz)
SYNC = 300kHz Clock Signal, RT = 91.5k
RT = 16.7k (1MHz)
RT = 4.03k (2.5MHz)
95
97
%
94
96
%
l 85
90
%
74
%
2.3
2.8
3.5
A
Switch VCESAT
Switch Leakage Current
CTRL Input Bias Current
Error Amplifier Transconductance
ISW = 1.5A
VSW = 45V, PWM = 0V
Current Out of Pin, VCTRL = 0.1V
400
mV
2
µA
20
100
nA
550
µS
VC Output Impedance
1000
kΩ
VC Idle Input Bias Current
PWM = 0, VC = 1V
–20
0
20
nA
FB Pin Input Bias Current
FB Pin Threshold
Current Out of Pin, VFB = 0.5V
20
100
nA
l 0.98 1.01 1.04
V
ISP , ISN Idle Input Bias Current
ISP , ISN Full-Scale Input Bias Current
SHDN Voltage High
PWM = 0V
ISP Tied to ISN, VISP = 24V, VCTRL = 2V
300
nA
20
µA
l 1.2
V
SHDN Voltage Low
SHDN Pin Bias Current
–40°C ≤ TJ ≤ 125°C
125°C < TJ ≤ 150°C
0.45
V
0.40
V
60
100
µA
PWM Input High Voltage
l 1.2
V
PWM Input Low Voltage
PWM Pin Bias Current
–40°C ≤ TJ ≤ 125°C
125°C < TJ ≤ 150°C
0.45
V
0.40
V
60
120
µA
3518ff
For more information www.linear.com/LT3518
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