参数资料
| 型号： | LT4356CS-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC SURGE STOPPER ADJ 16-SOIC |
| 产品目录绘图： | LT4356 Output Graph LT4356 Series 16-SOIC |
| 标准包装： | 2,500 |
| 电压 - 工作： | 4 ~ 80V |
| 电压 - 箝位： | 27V，可调 |
| 技术： | 混合技术 |
| 电路数： | 1 |
| 应用： | 自动 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
| 配用： | DC1018B-C-ND - DEMO BOARD FOR LT4356-3 DC1018B-B-ND - DEMO BOARD FOR LT4356-2 DC1018B-A-ND - DEMO BOARD FOR LT4356-1 |
LT4356-3
APPLICATIONS INFORMATION
C TMR ? 100mV
t WARNING =
FaultTimerCurrent
The timer current starts at around 2μA with 0.5V or less
of V DS , increasing linearly to 50μA with 75V of V DS dur-
ing an overvoltage fault (Figure 1). During an overcurrent
fault, it starts at 4μA with 0.5V or less of V DS but increases
to 260μA with 80V across the MOSFET (Figure 2). This
arrangement allows the pass transistor to turn off faster
during an overcurrent event, since more power is dissipated
during this condition. Refer to the Typical Performance
Characteristics section for the timer current at different
V DS in both overvoltage and overcurrent events.
When the voltage at the TMR pin, V TMR , reaches the 1.25V
threshold, the FLT pin pulls low to indicate the detection
of a fault condition and provide warning to the load of
the impending power loss. In the case of an overvoltage
fault, the timer current then switches to a fixed 5μA. The
interval between FLT asserting low and the MOSFET turn-
ing off is given by:
5μA
V TMR(V)
1.35
1.25
I TMR = 5μA
V DS = 75V
(I TMR = 50μA)
V DS = 10V
(I TMR = 8μA)
I TMR = 5μA
0.50
t FLT
= 15ms/μF
t WARNING
= 20ms/μF
TIME
t FLT = 93.75ms/μF
TOTAL FAULT TIMER = t FLT + t WARNING
t WARNING
= 20ms/μF
43563 F01
Figure 1. Overvoltage Fault Timer Current
V TMR(V)
1.35
1.25
V DS = 80V
(I TMR = 260μA)
V DS = 10V
(I TMR = 35μA)
0.50
t FLT
= 2.88ms/μF
t WARNING
= 0.38ms/μF
TIME
t FLT = 21.43ms/μF
TOTAL FAULT TIMER = t FLT + t WARNING
t WARNING
= 2.86ms/μF
43563 F02
Figure 2. Overcurrent Fault Timer Current
43563fb
11
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