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参数资料
| 型号： | TPS40000DGQG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 4/27页 |
| 文件大小： | 663K |
| 代理商： | TPS40000DGQG4 |
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TPS40000, TPS40001
TPS40002, TPS40003
TPS40004, TPS40005
SLUS507D JANUARY 2002 REVISED NOVEMBER 2005
12
www.ti.com
APPLICATION INFORMATION
Figure 4 shows the behavior of key signals during initial startup, during a fault and a successfully fault recovery.
At time t0, power is applied to the converter. The voltage on the soft-start capacitor (VCSS) begins to ramp up
and acts as the reference until it passes the internal reference voltage at t1. At this point the soft-start period
is over and the converter is regulating its output at the desired voltage level. From t0 to t1, pulse-by-pulse current
limiting is in effect, and from t1 onward, overcurrent pulses are counted for purposes of determining a possible
fault condition. At t2, a heavy overload is applied to the converter. This overload is in excess of the overcurrent
threshold. The converter starts limiting current and the output voltage falls to some level depending on the
overload applied. During the period from t2 to t3, the counter is counting overcurrent pulses, and at time t3
reaches a full count of 7. The soft-start capacitor is then discharged, the counter is decremented, and a fault
condition is declared.
VCSS
VOUT
ILOAD
UDG01144
t
t0
t1
t2 t3
t10
0
6
5
4
3
2
1
0
t4
t5
t6
t7
t8
t9
1
2
3
4
5
6
7
0.7 V
FAULT
Figure 4. Switch Node Waveforms for Synchronous Buck Converter
When the soft start capacitor is fully discharged, it begins charging again at the same rate that it does on startup,
with a nominal 3-
A current source. As the capacitor voltage reaches full charge, it is discharged again and the
counter is decremented by one count. These transitions occur at t3 through t9. At t9, the counter has been
decremented to 0. The fault logic is then cleared, the outputs are enabled, and the converter attempts to restart
with a full soft-start cycle. The converter comes into regulation at t10.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40000DGQR | 功能描述:电压模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40000DGQRG4 | 功能描述:电压模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40001 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW-INPUT VOLTAGE-MODE SYNCHRONOUS BUCK CONTROLLER |
| TPS40001DGQ | 功能描述:电压模式 PWM 控制器 Lo-Inp Voltage Mode Sync buck Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40001DGQG4 | 功能描述:电压模式 PWM 控制器 Lo-Inp Voltage Mode Sync buck Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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