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| 型号： | TPS40130RHB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | PLASTIC, QFN-32 |
| 文件页数： | 5/38页 |
| 文件大小： | 950K |
| 代理商： | TPS40130RHB |
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Overvoltage Protection
Output Undervoltage Protection
Programmable Input Undervoltage Lockout Protection
Power-On Reset (POR)
Fault Masking Operation
Fault Conditions and MOSFET Control
SLUS602B – JUNE 2004 – REVISED SEPTEMBER 2005
FUNCTIONAL DESCRIPTION (continued)
After the device is enabled and prior to the IC starting (during the first 32 clock cycles), a 5-A current flows out
of the CS1 and CS2 pins. The current flows through the external components: current sense resistor, RCS, the
output inductor and the output capacitor(s) to ground. If the voltage on the CS1 and CS2 pins exceed 0.2 V
(resistance greater than 40 k
), a fault is declared and the device does not start. This is a fault detection feature
that insures the output inductor, current sense resistor and output capacitors are installed properly on the board.
The voltage on OVSET is compared with 0.817 V, 16% higher than VREF, in U25 to determine the output
overvoltage point. When an overvoltage is detected, the output drivers command the upper MOSFETs off and
the lower MOSFETs on. If the overvoltage is caused by a shorted upper MOSFET, latching on the lower
MOSFET should blow the input fuse and protect the output. Hiccup mode consisting of seven (7) soft-start
timing cycles is initiated and then attempts to restart. If the overvoltage condition has been cleared and the input
fuse has not opened, the output comes up and normal operation continues. If the overvoltage condition persists,
the controller restarts to allow the output to rise to the overvoltage level and return to the hiccup mode. Using a
voltage divider with the same ratio, that sets the output voltage, an output overvoltage is declared when the
output rises 16% above nominal.
If the output voltage, as sensed by U19 on the FB pin becomes less than 0.588 V, the undervoltage protection
threshold (84% of VREF), the controller enters the hiccup mode as it is described in the Overcurrent Protection
section.
A voltage divider that sets 1V on the UVLO pin determines when the controller starts operating. Operation
commences when the voltage on the UVLO pin exceeds 1.0 V.
The power-on reset (POR) function, U22, insures the VIN5 and BP5 voltages are within their regulation windows
before the controller is allowed to start.
If the SS pin voltage is externally limited below the 1-V threshold, the controller does not respond to most faults
and the PGOOD output is always low. Only the overcurrent function and current sense fault remain active. The
overcurrent protection still continues to terminate PWM cycle every time when the threshold is exceeded but the
hiccup mode is not entered.
Table 1 shows a summary of the fault conditions and the state of the MOSFETs.
Table 1. Fault Condifions
FAULT MODE
UPPER MOSFET
LOWER MOSFET
EN/SYNC = LOW
OFF
FIXED UVLO, VBP5 < 4.25 V
OFF
Programmable UVLO, < 1.0 V
OFF
ON
Output undervoltage
OFF, Hiccup mode
ON, Hiccup mode
Output overvoltage
OFF, Hiccup mode
ON, Hiccup mode
ISF, current sense fault
OFF
ON
13
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相关代理商/技术参数 |
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| TPS40130RHBR | 功能描述:DC/DC 开关控制器 2-Ch Multiphase Buck DC/DC w/Int Drvr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40130RHBRG4 | 功能描述:DC/DC 开关控制器 2-Ch Multiphase Buck DC/DC w/Int Drvr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40130RHBT | 功能描述:DC/DC 开关控制器 2-Ch Multiphase Buck DC/DC w/Int Drvr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40130RHBTG4 | 功能描述:DC/DC 开关控制器 2-Ch Multiphase Buck DC/DC w/Int Drvr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40131 | 制造商:TI 制造商全称:Texas Instruments 功能描述:TWO-PHASE, SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED MOSFET DRIVERS |
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