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参数资料
| 型号： | TPS54326RGTR |
| 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, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 25/26页 |
| 文件大小： | 911K |
| 代理商： | TPS54326RGTR |
SLVSA13D
– OCTOBER 2009 – REVISED FEBRUARY 2011
Current Protection
The output over-current protection (OCP) is implemented using a cycle-by-cycle valley detect control circuit. The
switch current is monitored by measuring the low-side FET switch voltage between the SW pin and GND. This
voltage is proportional to the switch current. To improve accuracy, the voltage sensing is temperature
compensated.
During the on time of the high-side FET switch, the switch current increases at a linear rate determined by Vin,
Vout, the on-time and the output inductor value. During the on time of the low-side FET switch, this current
decreases linearly. The average value of the switch current is the load current Iout. If the measured voltage is
above the voltage proportional to the current limit, Then , the device constantly monitors the low-side FET switch
voltage, which is proportional to the switch current, during the low-side on-time.
The converter maintains the low-side switch on until the measured voltage is below the voltage corresponding to
the current limit at which time the switching cycle is terminated and a new switching cycle begins. In subsequent
switching cycles, the on-time is set to a fixed value and the current is monitored in the same manner.
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 TPS54326 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 TPS54326 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 TPS54326 shuts off. This protection is non-latching.
8
2009–2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS54326
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| TPS54327 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET (SWIFTTM ) |
| TPS54327DDA | 功能描述:直流/直流开关转换器 4.5-18Vin,3A Sync Step-Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54327DDAR | 功能描述:直流/直流开关转换器 4.5-18Vin,3A Sync Step-Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54327DRCR | 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 3A 10SON 制造商:Texas Instruments 功能描述:3A Single Sync DC/DC converter |
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