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参数资料
| 型号： | PT5406N |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, MSMA5 |
| 封装： | METAL, VERTICAL MOUNT PACKAGE-5 |
| 文件页数： | 13/16页 |
| 文件大小： | 304K |
| 代理商： | PT5406N |
For technical support and further information, visit http://power.ti.com
PT5400 Series
Operating Features of the PT5400
SWIFT
Series of Power Modules
Under-Voltage Lockout (UVLO)
The PT5400 SWIFT series of power modules incor-
porate an under-voltage lockout (UVLO) function. The
UVLO function provides a clean transition during power-
up and power-down, allowing the regulator to tolerate a
slowly rising input voltage. The UVLO prevents opera-
tion of the module until the input voltage has risen above
2.95 V. Below this threshold the status of the inhibit
control pin is overriden, and the module will not produce
an output. When the input voltage rises above this thresh-
old, the output status of the module is determined by the
inhibit control pin. If the inhibit control is open-circuit
(not grounded), the module will automatically power up.
The UVLO circuit has approximately 0.16 V of hysteresis,
and will completely turn off the module when a falling
input voltage drops below about 2.8 V. (Note: Even though
the applied input voltage may be above the UVLO threshold,
operation to the published specifications requires that the input
voltage be at or above the minimum specified for each model in
the series. This ensures that the output voltage of the module is in
regulation.)
Soft-Start Power Up
Following either the application of a valid input source
voltage, or the removal of a ground signal to the inhibit
control pin (with input power applied), the module will
initiate a soft-start power up. The soft start has two
effects on the start-up characteristic. It introduces a short
time delay prior to the start-up of the output voltage,
and also slows the rate at which the output voltage rises.
Figure 1-1 shows the power-up characteristic of a PT5404
(1.8 V). In this example the delay time, td, is measured
from the point at which the input voltage rises above
2.95 V (the UVLO threshold), to the point that the output
voltage starts to rise. The time period t(SS) is the rise time
of the output voltage ramp. The value of td and t(SS)
are are approximately 10 ms and 7.5 ms respectively.
Vin (1V/Div)
Vout (1V/Div)
t (SS)
d
t
Vin =2.95V
HORIZ SCALE: 5ms/Div
Figure 1-1; Soft-Start Characteristic and Timing
If desired, both time periods can be lengthened with the
addition of a low value capacitor between the Inhibit
control (pin 1) and the COM (pin 3). For a given value
of external capacitance, Cinh, the formulas for calculating
the approximate effect on td and t(SS) are given below.
td
≈ (Cinh + 0.047 F) × 1.2 V
5 A
t(SS)
≈ (Cinh + 0.047 F) × 0.7 V
5 A
Note: The capacitor should be placed as close to the regulator as
possible. Adding 0.047 F of external capacitance to the Inhibit
pin approximately doubles the value of td and t(SS).
Current Limit Protection
The output current limit feature is one of two fault
protection mechanisms built into the PT5400 modules.
Its purpose is to protect both the module and input source
against the occurance of a load fault, thereby isolating the
fault and preventing it from propagating to other parts
of the power system. The PT5400 regulators sense the
current switched by the series (high-side) power MOSFET.
The circuit implements a continuous current limit char-
acteristic. Upon the removal of the fault the output voltage
will promptly recover, and the module will return to nor-
mal operation.
A current limit condition will also increase the module’s
power dissipation, which may cause the temperature of
the internal components to significantly rise. If the con-
dition persists, the module may begin to cycle in and out
of thermal shutdown.
Thermal Shutdown
Thermal shutdown is the second fault protection mecha-
nism and protects the module’s internal circuitry against
excessively high temperatures. A rise in the temperature
of the internal circuitry may be the result of a drop in
airflow, a high ambient temperature, or a sustained over-
current load fault. If the junction temperature of the
internal components exceed 150 °C, the module will
shutdown. Once in thermal shutdown, the regulator is
disabled and the output voltage is reduced to zero. The
recovery is automatic and begins with a soft-start power
up. Recovery occurs when the the sensed temperature
decreases 10 °C below the trip point.
Application Notes
相关PDF资料 |
PDF描述 |
|---|---|
| PT5404C | 5.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, MSMA5 |
| PT5406C | 5.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, MSMA5 |
| PT5408A | 6 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, MSMA5 |
| PT5405C | 5.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, MSMA5 |
| PT5403N | 5.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, MSMA5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PT5407 | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A 5-V/3.3-V Input Adjustable SWIFT Power Module |
| PT5407A | 功能描述:DC/DC转换器 1V 6A 3.3/5V Input Adj SWIFT Module RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PT5407C | 功能描述:DC/DC转换器 1V 6A 3.3/5V Input Adj SWIFT Module RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PT5407N | 功能描述:开关变换器、稳压器与控制器 1V 6A 3.3/5V Input Adj SWIFT Module RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| PT5408 | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A 5-V/3.3-V Input Adjustable SWIFT Power Module |
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