參數(shù)資料
型號(hào)： LLT3837EFE
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 4.40 MM, PLASTIC, TSSOP-16
文件頁數(shù)： 22/28頁
文件大小： 255K
代理商： LLT3837EFE
LT3837
3
3837fa
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specied maximum operating junction
temperature may impair device reliability.
ELECTRICAL CHARACTERISTICS The l denotes specications which apply over the full operating
temperature range, otherwise specications are TA = 25°C. VCC = 14V; PG, SG Open; VC = 1.4V, VSENSE = 0, RCMP = 1k, RTON = 90k,
RPGDLY = 27.4k, RENDLY = 90k, unless otherwise specied.
Note 3: The LT3837E is guaranteed to meet performance specications
from 0°C to 85°C. Specications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 4: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD 40°C/W)
Note 5: Supply current does not include gate charge current to the
MOSFETs. See Applications Information.
Note 6: Component value range guaranteed by design.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Feedback Amplier Voltage Gain
VC = 1V to 2V
1400
V/V
Soft-Start Charging Current
VSFST = 1.5V
16
20
25
μA
Soft-Start Discharge Current
VSFST = 1.5V, VUVLO = 0V
0.7
1.3
mA
Control Pin Threshold (VC)
Duty Cycle = Min
1.0
V
Gate Outputs
PG, SG Output High Level
PG, SG Output Low Level
l
6.6
7.4
0.01
8.0
0.05
V
PG, SG Output Shutdown Strength
VUVLO = 0V; IPG, ISG = 20mA
l
1.6
2.3
V
PG Rise Time
CPG = 1nF
11
ns
SG Rise Time
CSG = 1nF
15
ns
PG, SG Fall Time
CPG, CSG = 1nF
10
ns
Current Amplier
Switch Current Limit at Maximum VC
VSENSE +
l
88
98
110
mV
ΔVSENSE/ΔVC
0.07
V/V
Sense Voltage Overcurrent Fault Voltage
VSENSE +, VSFST < 1V
206
230
mV
Timing
Switching Frequency (fOSC)COSC = 100pF
l
84
100
110
kHz
Oscillator Capacitor Value (COSC)
(Note 6)
33
200
pF
Minimum Switch On Time (tON(MIN))
200
ns
Flyback Enable Delay Time (tED)
265
ns
PG Turn-On Delay Time (tPGDLY)
200
ns
Maximum Switch Duty Cycle
l
85
88
%
SYNC Pin Threshold
l
1.53
2.1
V
SYNC Pin Input Resistance
40
k
Ω
Load Compensation
Load Comp to VSENSE Offset Voltage
VRCMP with VSENSE+ = 0
0.8
mV
Feedback Pin Load Compensation Current
VSENSE+ = 20mV
20
μA
UVLO Function
UVLO Pin Threshold (VUVLO)
l
1.215
1.240
1.265
V
UVLO Pin Bias Current
VUVLO = 1.2V
VUVLO = 1.3V
–0.25
–4.50
0.1
–3.4
0.25
–2.50
μA
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