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参数资料
| 型号： | PT5802C |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 18 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, SMA18 |
| 封装： | SMD-18 |
| 文件页数： | 8/13页 |
| 文件大小： | 228K |
| 代理商： | PT5802C |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT5800 & PT5810 Series
With the sense leads connected, the difference between
the voltage measured at Vout and GND pins, and that
measured from Sense(+) to Sense(–), is the amount of IR
drop being compensated by the regulator. This should
be limited to 0.6V. (0.3V maximum between pins 17 &
18, and also between pins 8 & 9).
Note: The remote sense feature is not designed to compensate
for the forward drop of non-linear or frequency dependent
components that may be placed in series with the converter
output. Examples include OR-ing diodes, filter inductors,
ferrite beads, and fuses. When these components are enclosed
by the remote sense connections they are effectively placed
inside the regulation control loop, which can adversely affect
the stability of the regulator.
Over-Current Protection
To protect against load faults, the regulators incorporate
output over-current protection. Applying a load that
exceeds the regulator’s over-current threshold (see data
sheet specifications) will cause the regulated output to
shut down. Following shutdown the ISR will periodically
attempt to recover by initiating a soft-start power-up.
This is often described as a “hiccup” mode of operation,
whereby the module continues in the cycle of successive
shutdown and power up until the load fault is removed.
During this period, the average current flowing into the
fault is significantly reduced. Once the fault is removed,
the converter automatically recovers and returns to nor-
mal operation.
Over-Temperature Protection
An on-board temperature sensor protects the module’s
internal circuitry against excessively high temperatures.
A rise in the internal temperature may be the result of a
drop in airflow, or a high ambient temperature. If the
internal temperature exceeds the OTP threshold (see
data sheet specifications), the regulator’s Inhibit* control
is automatically pulled low. This disables the regulator,
allowing the output voltage to drop to zero as the exter-
nal output capacitors are discharged by the load circuit.
The recovery is automatic, and begins with a soft-start
power up. It occurs when the the sensed temperature
decreases by about 10°C below the trip point.
Note: The over-temperature protection is a last resort mecha-
nism to prevent thermal stress to the regulator. Operation at
or close to the thermal shutdown temperature is not recom-
mended and will reduce the long-term reliability of the module.
Always operate the regulator within the specified Safe Operating
Area (SOA) limits for the worst-case conditions of ambient
temperature and airflow.
Differential Remote Sense
Connecting the Sense(+) and Sense(-) pins to the load
circuit allows the regulator to compensate for limited
amounts of ‘IR’ voltage drop. This voltage drop is caused
by current flowing through the connection resistance
between the regulator and the ‘point of regulation’ some
distance away. Leaving the sense pins disconnected will
not damage the regulator or load circuitry. An internal
15
resistor, connected between each sense pin and its
corresponding output node, keeps the output voltage in
regulation. However, it is important to connect Sense(–)
to GND locally, as this provides a return path for the
regulator’s internal bias currents.
Operating Features and System Considerations
for the PT5800 & PT5810 Regulator Series
The PT5800 (5-V input) and the PT5810 (3.3-V input)
series of integrated switching regulators (ISRs) provide
step-down voltage conversion for output loads of up to
18A.
Power up & Soft-Start Timing
Following either the application of a valid input source
voltage, or the removal of a ground signal to the Inhihit*
control pin (with input power applied), the regulator will
initiate a soft-start power up. The soft start slows the
rate at which the output voltage rises, and also introduces a
short time delay, td (approx. 2ms). Figure 1-1 shows the
power-up characteristic of a PT5801 (3.3V) with a 10-A
load.
Vo (2V/Div)
Vin (2V/Div)
HORIZ SCALE: 5ms/Div
t
d
Figure 1-1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PT5802N | 功能描述:开关变换器、稳压器与控制器 2.5V 18-A 5-V Input Adj Step-Down ISR 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 |
| PT5803 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:18-A 5-V Input Adjustable Integrated Switching Regulator |
| PT5803A | 功能描述:REG 1.8V 18A 4.5/5.5VIN HORZ RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT5800 设计资源:Maxi/Mini/Micro Design Guide, Appl Manual 标准包装:1 系列:Maxi 类型:隔离 输出数:1 电压 - 输入（最小）:43V 电压 - 输入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:400W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:模块 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包装:散装 工作温度:-55°C ~ 100°C 效率:* 电源（瓦特）- 最大:* |
| PT5803C | 功能描述:DC/DC转换器 1.8V 18-A 5-V Input Adj Step-Down ISR 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: |
| PT5803N | 功能描述:开关变换器、稳压器与控制器 1.8V 18-A 5-V Input Adj Step-Down ISR 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 |
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