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| 型号： | LTC3803IS6-3#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK PWM TSOT23-6 |
| 标准包装： | 500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 90% |
| 电源电压： | 5.7 V ~ 8 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 相关产品： | 732-2263-6-ND - TRANS FLYBACK LTC3803 16.9UH 732-2263-1-ND - TRANS FLYBACK LTC3803 16.9UH 732-2263-2-ND - TRANS FLYBACK LTC3803 16.9UH |
LTC3803-3
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
junction temperature range, otherwise speci?cations are at T A = 25°C. V CC = 8V, unless otherwise noted. (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V CLAMP25mA
V MARGIN
I CC
V ITHSHDN
I ITHSTART
V FB
V IMAX
g m
V CC Shunt Regulator Voltage
V CLAMP1mA – V TURNON Margin
Input DC Supply Current
Normal Operation
Start-Up
Shutdown Threshold (at I TH /RUN)
Start-Up Current Source
Regulated Feedback Voltage
Peak Current Sense Voltage
Error Ampli?er Transconductance
I CC = 25mA, V ITH/RUN = 0V
LTC3803E-3, LTC3803I-3
LTC3803H-3
LTC3803MP-3
LTC3803E-3, LTC3803I-3,
LTC3803H-3
LTC3803MP-3
(Note 4)
V ITH/RUN = 1.3V
V CC = V TURNON – 100mV
V CC > V TURNON , V ITH/RUN Falling
LTC3803E-3
LTC3803I-3, LTC3803H-3
LTC3803MP-3
V ITH/RUN = 0V
(Note 5)
0°C ≤ T J ≤ 85°C
LTC3803E-3: –40°C ≤ T J ≤ 85°C
LTC3803I-3: –40°C ≤ T J ≤ 125°C
LTC3803H-3: –40°C ≤ T J ≤ 150°C
LTC3803MP-3: –55°C ≤ T J ≤ 150°C
R SL = 0 (Note 6)
LTC3803E-3
LTC3803I-3, LTC3803H-3
LTC3803MP-3
I TH/RUN Pin Load = ±5μA (Note 5)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
8.4
8.4
8.1
0.05
0.03
0.15
0.10
0.09
0.2
0.788
0.780
0.780
0.780
0.780
90
85
85
200
9.5
9.5
9.5
0.6
0.6
240
40
0.28
0.28
0.28
0.3
0.800
0.800
0.800
0.800
0.800
100
100
100
333
10.5
10.7
10.7
350
90
0.45
0.45
0.45
0.4
0.812
0.812
0.820
0.820
0.820
115
115
120
500
V
V
V
V
V
μA
μA
V
V
V
μA
V
V
V
V
V
mV
mV
mV
μA/V
Δ V O(LINE)
Output Voltage Line Regulation
(Note 5)
0.05
mV/V
I FB
V FB Input Current
(Note 5)
10
50
nA
f OSC
DC ON(MIN)
DC ON(MAX)
t RISE
t FALL
Oscillator Frequency
Minimum Switch On Duty Cycle
Maximum Switch On Duty Cycle
Gate Drive Rise Time
Gate Drive Fall Time
V ITH/RUN = 1.3V
V ITH/RUN = 1.3V, V FB = 0.8V
V ITH/RUN = 1.3V, V FB = 0.8V
C LOAD = 3000pF
C LOAD = 3000pF (Note 7)
270
70
300
8
80
40
40
330
9.6
90
kHz
%
%
ns
ns
I SLMAX
t SFST
Peak Slope Compensation Output Current (Note 7)
Soft-Start Time
5
1.4
μA
ms
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: The LTC3803-3 is tested under pulsed load conditions such
that T J ≈ T A . The LTC3803E-3 is guaranteed to meet speci?cations
from 0°C to 85°C junction temperature. Speci?cations over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3803I-3 is guaranteed over the –40°C to 125°C operating junction
temperature range, the LTC3803H-3 is guaranteed over the –40°C to
150°C operating junction temperature range and the LTC3803MP-3 is
tested and guaranteed over the full –55°C to 150°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes; operating lifetime is derated for junction temperatures greater
than 125°C. Note that the maximum ambient temperature consistent with
these speci?cations is determined by speci?c operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 3: Junction temperature T J is calculated from the ambient
temperature T A and power dissipation P D according to the following
formula:
T J = T A + (P D ? 230°C/W).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC3803-3 is tested in a feedback loop that servos V FB to the
output of the error ampli?er while maintaining I TH /RUN at the midpoint of
the current limit range.
Note 6: Peak current sense voltage is reduced dependent on duty cycle
and an optional external resistor in series with the SENSE pin (R SL ). For
details, refer to the programmable slope compensation feature in the
Applications Information section.
Note 7: Guaranteed by design.
38033fd
3
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