参数资料
| 型号： | LT3825EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO 16-TSSOP |
| 标准包装： | 95 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 88% |
| 电源电压： | 11 V ~ 18 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： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
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LT3825
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T A = 25°C. V CC = 14V; PG, SG Open; V C = 1.5V, V SENSE– = 0V; R CMP = 1k,
R tON = 90k, R PGDLY = 27.4k, R ENDLY = 90k, unless otherwise specified (Note 3).
PARAMETER
Reference Voltage Line Regulation
Feedback Amplifier Voltage Gain
Soft-Start Charging Current
Soft-Start Discharge Current
Control Pin Threshold (V C )
CONDITIONS
12V ≤ V CC ≤ 18V
V C = 1.2V to 1.7V
V SFST = 1.5V
V SFST = 1.5V, V UVLO = 0V
Duty Cycle = Min
l
MIN
16
0.8
TYP
0.005
1400
20
1.3
1.0
MAX
0.02
25
UNITS
%/V
V/V
μA
mA
V
Gate Outputs
PG, SG Output High Level
PG, SG Output Low Level
l
l
6.6
7.4
0.01
8.0
0.05
V
V
PG, SG Output Shutdown Strength
PG Rise Time
SG Rise Time
PG, SG Fall Time
V UVLO = 0V; I PG , I SG = 20mA
C PG = 1nF
C SG = 1nF
C PG , C SG = 1nF
l
1.6
11
15
10
2.3
V
ns
ns
ns
Current Amplifier
Switch Current Limit at Maximum V C
V SENSE+
l
88
98
110
mV
? V SENSE / ? V C
0.07
V/V
Sense Voltage Overcurrent Fault Voltage
V SENSE+
l
206
230
mV
Timing
Switching Frequency (f OSC )
Oscillator Capacitor Value (C OSC )
C OSC = 100pF
(Note 6)
l
84
33
100
110
200
kHz
pF
Minimum Switch On-Time (t ON(MIN) )
Flyback Enable Delay Time (t ED )
PG Turn-On Delay Time (t PGDLY )
200
265
200
ns
ns
ns
Maximum Switch Duty Cycle
l
85
88
%
SYNC Pin Threshold
SYNC Pin Input Resistance
l
1.53
40
2.1
V
kΩ
Load Compensation
Load Comp to V SENSE Offset Voltage
Feedback Pin Load Compensation Current
V RCMP with V SENSE+ = 0V
V SENSE+ = 20mV, V FB = 1.230V
1
20
mV
μA
UVLO Function
UVLO Pin Threshold (V UVLO )
UVLO Pin Bias Current
V UVLO = 1.2V
V UVLO = 1.3V
l
1.215
–0.25
–4.50
1.240
0
–3.4
1.265
±0.25
–2.50
V
μA
μA
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 specified maximum operating junction
temperature may impair device reliability.
Note 3: The LT3825 is tested under pulsed load conditions, such that T J ≈ T A .
The LT3825E is guaranteed to meet performance specifications from 0°C to
125°C. Specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with statistical
process controls. Note that the maximum ambient temperature consistent
with these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and other
environmental factors.
Note 4: 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 ? 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.
3825fe
3
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