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參數(shù)資料
| 型號： | LTBDM |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Micropower Buck Regulator with Integrated Boost and Catch Diodes |
| 中文描述： | 微功耗降壓穩(wěn)壓器與集成升壓二極管和捕捉 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 205K |
| 代理商： | LTBDM |
13
LT3470
3470f
Figure 6: A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT3470 is Connected to a Live Supply
+
LT3470
2.2
μ
F
V
IN
10V/DIV
I
IN
10A/DIV
10
μ
s/DIV
V
IN
CLOSING SWITCH
SIMULATES HOT PLUG
I
IN
(6a)
(6b)
(6c)
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
+
LT3470
2.2
μ
F
10
μ
F
35V
AI.EI.
LT3470
2.2
μ
F
0.1
μ
F
1
3470 F06
in the circuit. An alternative solution is shown in Figure 6c.
A 1
resistor is added in series with the input to eliminate
the voltage overshoot (it also reduces the peak input
current). A 0.1
μ
F capacitor improves high frequency filter-
ing. This solution is smaller and less expensive than the
electrolytic capacitor. For high input voltages its impact on
efficiency is minor, reducing efficiency less than one half
percent for a 5V output at full load operating from 24V.
High Temperature Considerations
The die temperature of the LT3470 must be lower than the
maximum rating of 125
°
C. This is generally not a concern
unless the ambient temperature is above 85
°
C. For higher
temperatures, care should be taken in the layout of the
circuit to ensure good heat sinking of the LT3470. The
maximum load current should be derated as the ambient
temperature approaches 125
°
C. The die temperature is
calculated by multiplying the LT3470 power dissipation
by the thermal resistance from junction to ambient.
Power dissipation within the LT3470 can be estimated by
calculating the total power loss from an efficiency mea-
surement. Thermal resistance depends on the layout of
the circuit board, but a value of 150
°
C/W is typical. The
temperature rise for an LT3470 producing 5V at 200mA
is approximately 30
°
C, allowing it to deliver full load to
100
°
C ambient. Above this temperature the load current
should be reduced. For 3.3V at 200mA the temperature
rise is 20
°
C. Finally, be aware that at high ambient
temperatures the internal Schottky diode will have signifi-
cant leakage current (See Typical Performance Charac-
teristics) increasing the quiescent current of the LT3470
converter.
APPLICATIU
W
U
U
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