- 您现在的位置：买卖IC网 > PDF目录69257 > PTN78000AAZ (TEXAS INSTRUMENTS INC) 1-OUTPUT 9 W DC-DC REG PWR SUPPLY MODULE PDF资料下载
参数资料
| 型号： | PTN78000AAZ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 9 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-5 |
| 文件页数： | 4/19页 |
| 文件大小： | 492K |
| 代理商： | PTN78000AAZ |
www.ti.com
Power-Up Characteristics
t - Time = 5 ms/div
I (1 A/div)
I
VO (2 V/div)
VI (5 V/div)
Undervoltage Lockout
Current Limit Protection
Overtemperature Protection
PTN78000A
SLTS246B–APRIL 2005–REVISED JANUARY 2006
When configured per the standard application, the PTN78000A power module produces a regulated output
voltage following the application of a valid input source voltage. During power up, internal soft-start circuitry slows
the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the
input source. The soft-start circuitry introduces a short time delay (typically 5 ms – 10 ms) into the power-up
characteristic. This is from the point that a valid input source is recognized. Figure 18 shows the power-up
waveforms for a PTN78000A, operating from a 12-V input and with the output voltage adjusted to –5 V. The
waveforms were measured with a 1.5-A resistive load.
Figure 18. Power-Up Waveforms
The undervoltage lockout (UVLO) circuit prevents the module from attempting to power up until the input voltage
is above the UVLO threshold. This prevents the module from drawing excessive current from the input source at
power up. Below the UVLO threshold, the module is held off.
The PTN78000 modules protect against load faults with a continuous current limit characteristic. Under a load
fault condition, the output current cannot exceed the current limit value. Attempting to draw current that exceeds
the current limit value causes the module to progressively reduce its output voltage. Current is continuously
supplied to the fault until it is removed. On removal of the fault, the output voltage promptly recovers. When
limiting output current, the regulator experiences higher power dissipation, which increases its temperature. If the
temperature increase is excessive, the module's overtemperature protection begins to periodically turn the output
voltage completely off.
A thermal shutdown mechanism protects the module's internal circuitry against excessively high temperatures. A
rise in temperature may be the result of a drop in airflow, a high ambient temperature, or a sustained current-limit
condition. If the junction temperature of the internal control IC rises excessively, the module turns itself off,
reducing the output voltage to zero. The module instantly restarts when the sensed temperature decreases by a
few degrees.
Note: Overtemperature protection is a last-resort mechanism to prevent damage to the module. It should not be
relied on as permanent protection against thermal stress. Always operate the module within its temperature
derated limits, for the worst-case operating conditions of output current, ambient temperature, and airflow.
Operating the module above these limits, albeit below the thermal shutdown temperature, reduces the long-term
reliability of the module.
12
相关PDF资料 |
PDF描述 |
|---|---|
| PTN78000AAH | 1-OUTPUT 9 W DC-DC REG PWR SUPPLY MODULE |
| PTN78000HAST | 1-OUTPUT 22.5 W DC-DC REG PWR SUPPLY MODULE |
| PTN78000HAZ | 1-OUTPUT 22.5 W DC-DC REG PWR SUPPLY MODULE |
| PTN78000WAZT | 1-OUTPUT 22.5 W DC-DC REG PWR SUPPLY MODULE |
| PTN78000HAH | 1-OUTPUT 22.5 W DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PTN78000AAZT | 功能描述:DC/DC转换器 1.5A Wide Inp/ Neg Out Adj 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: |
| PTN78000H | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.5-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR |
| PTN78000HAH | 功能描述:DC/DC转换器 1.5 A Wide I/O Adj 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: |
| PTN78000HAH | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| PTN78000HAS | 功能描述:DC/DC转换器 1.5 A Wide I/O Adj 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: |
发布紧急采购，3分钟左右您将得到回复。