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| 型号： | TPS40003EVM |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | TPS40003 Evaluation Module(TPS40003评估板) |
| 中文描述： | TPS40003评估模块（TPS40003评估板） |
| 文件页数： | 17/17页 |
| 文件大小： | 339K |
| 代理商： | TPS40003EVM |
SLUU130A – September 2002 – Revised February 2003
9
TPS40003-Based 5-A Converter in Less Than One Square Inch
Figure 2 shows the plots for the closed loop gain and phase with VIN = 3.3 V and IOUT = 4.4 A. At the crossover
frequency of 60 kHz the phase margin is approximately 51 degrees.
100
150
100
50
0
–50
–100
40
30
20
10
0
–10
–20
–30
–40
1000
10000
1000000
Frequency – Hz
100000
Phase
–150
Gain
–
db
GAIN AND PHASE MARGIN
vs
FREQUENCY
Phase
–
degrees
ILOAD = 4.4 A
VI = 3.3 V
Gain
Figure 2.
4.8
Snubber Component Selection
The switch node where Q1 and L1 come together is very noisy. An R–C network fitted between this node and
ground can help reduce ringing and voltage overshoot on Q1:B. This ringing noise should be minimized to
prevent it from confusing the control circuitry which is monitoring this node for current limit and Predictive Gate
Drive
.
As a starting point, the snubber capacitor, C9, is generally chosen to be 5 to 8 times larger than the parasitic
capacitance at the node, which is primarily COS of Q1:B. Since COS is 440 pF for Q1:B, C9 is chosen to be 3.3 nF.
R3 is empirically determined to be 2.2
, which minimizes the ringing and overshoot at the switch node. With
low input voltages the power loss, 1/2
×C×V2×f , is relatively small at 24 mW.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40004 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW-INPUT VOLTAGE-MODE SYNCHRONOUS BUCK CONTROLLER |
| TPS40004DGQ | 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 |
| TPS40004DGQG4 | 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 |
| TPS40004DGQR | 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 |
| TPS40004DGQRG4 | 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 |
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