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| 型号： | PTN04050CAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | DIP-4 |
| 文件页数： | 3/19页 |
| 文件大小： | 640K |
| 代理商： | PTN04050CAST |
t- Time=10ms/div
V
(5V/div)
O
V (2V/div)
I
I (2 A/div)
I
SLTS251A
– SEPTEMBER 2005 – REVISED FEBRUARY 2011
Power-Up Characteristics
When configured per the standard application, the PTN04050C 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 drawn from the input
source.Figure 15 shows the power-up waveforms for a PTN04050C, operating from a 5-V input and with the
output voltage adjusted to 12 V. The waveforms were measured with a 1-A resistive load.
Figure 15. Power-Up Waveforms
Overtemperature Protection
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 overcurrent
condition. If the junction temperature of the internal control IC rises excessively, the module turns its boost
operation off. Although the module is off, an output voltage of approximately (VI – 300 mV) is still present. The
module restarts boost operation when the sensed temperature decreases by approximately 10 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.
2005–2011, Texas Instruments Incorporated
11
Product Folder Link(s): PTN04050C
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