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参数资料
| 型号： | LTC4355IS |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件页数： | 16/16页 |
| 文件大小： | 221K |
| 代理商： | LTC4355IS |
LTC4355
9
4355f
APPLICATIONS INFORMATION
–25mV of voltage drop across the drain and source pins
of the pass transistor, a fast pulldown circuit engages to
drive the gate low faster.
The remaining system power supply delivers the load cur-
rent through the body diode of its pass transistor until the
channel turns on. The LTC4355 ramps the gate up with
20A, turning on the N-channel MOSFET to reduce the
voltage drop across it.
When the capacitances at the inputs and output are very
small, large changes in current can cause inductive tran-
sients that exceed the 100V Absolute Maximum Ratings
of the pins. A surge suppressor (TransZorb) at the output
will minimize this ringing.
Loop Stability
The servo loop is compensated by the parasitic capaci-
tance of the power N-channel MOSFET. No further com-
pensation components are normally required. In the case
when a MOSFET with less than 1000pF gate capacitance
is chosen, a 1000pF compensation capacitor connected
across the gate and source pins might be required.
Design Example
The following design example demonstrates the calcula-
tions involved for selecting components in a 36V to 72V
system with 5A maximum load current (see Figure 1).
First, choose the N-channel MOSFET. The 100V,
FDS3672 in the SO-8 package with RDS(ON) = 22mΩ(max)
offers a good solution. The maximum voltage drop across
it is:
ΔV = 5A 22mΩ = 110mV
The maximum power dissipation in the MOSFET is a mere:
P = 5A 110mV = 0.55W
Next, select the resistive dividers that guarantee the
PWRFLT pins willl not assert when the input supplies are
above 36V. The maximum VMONx(TH) is 1.245V and the
maximum IMONx(IN) is 1A. Choose a 1% tolerance resistor
R1 = 12.7kΩ. Then,
I
V
R MIN
I
V
R
MONx TH
MONx TH MAX
2
1
1 245
1
=+
=
()
()(
)
()
.
2
27
1
100
.(
%)
k
AA
+=
Use IR2 to choose R2.
R
VV
A
k
2
36
1 245
100
348
=
=
.
Adjust R2 down by 1% to 344kΩ to account for its tolerance.
The next lower standard resistor value is R2 = 340kΩ.
The LED D1, a Panasonic Green LN1351C, requires at
least 1mA of current to fully turn on. Therefore, R5 is set
to 33kΩ to accommodate the lowest input supply voltage
of 36V.
4355 F01
LTC4355
GND
GATE1
GATE2
IN1
OUT
IN2
MON1
MON2
SET
R1
12.7k
R2
340k
R3
12.7k
R4
340k
R5
33k
R7
33k
R9
33k
R6
33k
R8
33k
D1
D3
D2
D4
D5
GND
M1
FDS3672
M2
FDS3672
TO
LOAD
VIN1 = +48V
VIN2 = +48V
VDSFLT
FUSEFLT1
FUSEFLT2
PWRFLT1
PWRFLT2
F1
7A
F2
7A
GREEN LEDs
PANASONIC LN1351C
Figure 1. 36V to 72V/5A Design Example
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4355IS#PBF | 功能描述:IC IDEAL DIODE-OR 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC4355IS#PBF | 制造商:Linear Technology 功能描述:Power Management IC |
| LTC4355IS#TRPBF | 功能描述:IC IDEAL DIODE-OR 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC4355ISPBF | 制造商:Linear Technology 功能描述:Ideal Diode-OR Controller 9-80V SOIC16 |
| LTC4357CDCB#PBF | 制造商:Linear Technology 功能描述:CONTROLLER DIODE SMD DFN-6 4357 制造商:Linear Technology 功能描述:IDEAL DIODE CONTROLLER, 80V, DFN-6; IC Function:Ideal Diode Controller; Supply Voltage Min:9V; Supply Voltage Max:80V; Operating Temperature Min:0C; Operating Temperature Max:70C; Digital IC Case Style:DFN; No. of Pins:6 ;RoHS Compliant: Yes |
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