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参数资料
| 型号： | TPS54225TPWPRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO14 |
| 封装： | PLASTIC, TSSOP-14 |
| 文件页数： | 17/18页 |
| 文件大小： | 354K |
| 代理商： | TPS54225TPWPRQ1 |
SLVSAV9
– JUNE 2011
There are some important considerations for this type of over-current protection. The load current one half of the
peak-to-peak inductor current higher than the over-current threshold. Also when the current is being limited, the
output voltage tends to fall as the demanded load current may be higher than the current available from the
converter. This may cause the output under-voltage protection circuit to be activated. When the over current
condition is removed, the output voltage will return to the regulated value. This protection is non-latching.
Over/Undervoltage Protection
The TPS54225-Q1 detects over and undervoltage conditions by monitoring the feedback voltage (VFB). This
function is enabled after approximately 1.7 times the soft-start time.When the feedback voltage becomes higher
than 120% of the target voltage, the OVP comparator output goes high and the circuit latches the high-side
MOSFET driver turns off and the low-side MOSFET turns on. When the feedback voltage becomes lower than
70% of the target voltage, the UVP comparator output goes high and an internal UVP delay counter begins. After
250
μs, the device latches off both internal top and bottom MOSFET.
UVLO Protection
Undervoltage lock out protection (UVLO) monitors the voltage of the VREG5 pin. When the VREG5 voltage is lower
than UVLO threshold voltage, the TPS54225-Q1 is shut off. This is protection is non-latching.
Thermal Shutdown
Thermal protection is self-activating. If the junction temperature exceeds the threshold value (typically 150
°C),
the TPS54225-Q1 shuts off. This protection is non-latching.
8
Copyright
2011, Texas Instruments Incorporated
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