LT3954IUHE 데이터 시트보기 (PDF) - Linear Technology
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LT3954IUHE Datasheet PDF : 26 Pages
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LT3954
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
VIN Minimum Operating Voltage
VIN Shutdown IQ
VIN Tied to INTVCC
l
EN/UVLO = 0V, PWM = 0V
EN/UVLO = 1.15V, PWM = 0V
4.5
V
0.1
1
µA
6
µA
VIN Operating IQ (Not Switching)
VREF Voltage
VREF Line Regulation
VREF Pull-Up Current
SW Pin Current Limit
PWM = 0V
–100µA ≤ IVREF ≤ 0µA
4.5V ≤ VIN ≤ 40V
VREF = 0V
l 1.965
l 150
l
5.4
1.8
2.02
0.001
185
6.3
2.2
mA
2.06
V
%/V
210
µA
7.2
A
SW Pin Leakage
SW = 24V
5
10
µA
SW Pin Voltage Drop
DIM/SS Pull-Up Current
ISW = 3A
100
mV
Current Out of Pin, DIM/SS = 0V
l
10
12
14
µA
DIM/SS Voltage Clamp
Error Amplifier
IDIM/SS = 0µA
1.2
V
Full-Scale ISP/ISN Current Sense Threshold
(VISP–ISN)
1/10th Scale ISP/ISN Current Sense Threshold
(VISP–ISN)
Mid-Scale ISP/ISN Current Sense Threshold
(VISP–ISN)
ISP/ISN Overcurrent Threshold
CTRL ≥ 1.2V, ISP = 24V
CTRL ≥ 1.2V, ISN = 0V
CTRL = 0.2V, ISP = 24V
CTRL = 0.2V, ISN = 0V
CTRL = 0.5V, ISP = 24V
CTRL = 0.5V, ISN = 0V
l 242
250
258
mV
l
243
257
268
mV
l
21
25
30
mV
l
20
28
36
mV
l
96
l
94
100
104
mV
105
115
mV
600
mV
ISP/ISN Current Sense Amplifier Input Common Mode
Range (VISN)
ISP/ISN Input Bias Current High Side Sensing
(Combined)
PWM = 5V (Active), ISP = ISN = 24V
PWM = 0V (Standby), ISP = ISN = 24V
0
40
V
100
µA
0.1
µA
ISP/ISN Input Bias Current Low Side Sensing (Combined) PWM = 5V, ISP = ISN = 0V
–230
µA
ISP/ISN Current Sense Amplifier gm (High Side Sensing)
ISP/ISN Current Sense Amplifier gm (Low Side Sensing)
CTRL Pin Range for Linear Current Sense Threshold
Adjustment
VISP–ISN = 250mV, ISP = 24V
VISP–ISN = 250mV, ISN = 0V
l
0
120
µS
70
µS
1.0
V
CTRL Input Bias Current
Current Out of Pin
50
100
nA
VC Output Impedance
VC Standby Input Bias Current
FB Regulation Voltage (VFB)
FB Amplifier gm
FB Pin Input Bias Current
FB Open LED Threshold
C/10 Inhibit for VMODE Assertion (VISP–ISN)
FB Overvoltage Threshold
Oscillator
0.9V ≤ VC ≤ 1.5V
PWM = 0V
ISP = ISN = 24V, 0V
FB = VFB, ISP = ISN = 24V
Current Out of Pin, FB = VFB
VMODE Falling, ISP Tied to ISN
FB = VFB, ISN = 24V, 0V
PWMOUT Falling
15
MΩ
–20
20
nA
l 1.225
1.255
1.275
V
500
µS
40
100
nA
l VFB – 65mV VFB – 50mV VFB – 40mV
V
14
25
39
mV
VFB + 50mV VFB + 60mV VFB + 70mV
V
Switching Frequency
SW Minimum Off-Time
RT = 95.3kΩ
RT = 8.87kΩ
l
85
925
100
115
kHz
1000
1050
kHz
160
ns
SW Minimum On-Time
180
ns
SYNC Input Low
0.4
V
SYNC Input High
1.5
V
3954fa
For more information www.linear.com/3954
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