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参数资料
| 型号： | TPS622312EVM-574 |
| 厂商： | Texas Instruments |
| 文件页数： | 25/35页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR TPS622312-574 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 3，非绝缘，（3电路） |
| 输出电压： | 1.3V，1.5V，2V |
| 电流 - 输出： | 500mA |
| 输入电压： | 2.05 V ~ 6 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 3MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TPS622312，TPS622313，TPS622314 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236
TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312
TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318
SLVS941E – APRIL 2009 – REVISED DECEMBER 2010
CHECKING LOOP STABILITY
The first step of circuit and stability evaluation is to look from a steady-state perspective at the following signals:
?
?
?
Switching node, SW
Inductor current, I L
Output ripple voltage, V OUT(AC)
These are the basic signals that need to be measured when evaluating a switching converter. When the
switching waveform shows large duty cycle jitter or the output voltage or inductor current shows oscillations, the
regulation loop may be unstable. This is often a result of board layout and/or L-C combination.
As a next step in the evaluation of the regulation loop, the load transient response is tested. The time between
the application of the load transient and the turn on of the P-channel MOSFET, the output capacitor must supply
all of the current required by the load. V OUT immediately shifts by an amount equal to Δ I (LOAD) x ESR, where ESR
is the effective series resistance of C OUT . Δ I (LOAD) begins to charge or discharge C O generating a feedback error
signal used by the regulator to return V OUT to its steady-state value. The results are most easily interpreted when
the device operates in PWM mode.
During this recovery time, V OUT can be monitored for settling time, overshoot or ringing that helps judge the
converter’s stability. Without any ringing, the loop has usually more than 45° of phase margin.
Because the damping factor of the circuitry is directly related to several resistive parameters (e.g., MOSFET
r DS(on) ) that are temperature dependant, the loop stability analysis has to be done over the input voltage range,
load current range, and temperature range.
LAYOUT CONSIDERATIONS
As for all switching power supplies, the layout is an important step in the design. Proper function of the device
demands careful attention to PCB layout. Care must be taken in board layout to get the specified performance. If
the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well
as EMI problems. It is critical to provide a low inductance, impedance ground path. Therefore, use wide and
short traces for the main current paths. The input capacitor should be placed as close as possible to the IC pins
as well as the inductor and output capacitor.
Use a common Power GND node and a different node for the Signal GND to minimize the effects of ground
noise. Keep the common path to the GND PIN, which returns the small signal components and the high current
of the output capacitors as short as possible to avoid ground noise. The FB line should be connected to the
output capacitor and routed away from noisy components and traces (e.g. SW line).
Total area
V IN
GND
L1
C2
is less than
12mm2
V OUT
Figure 55. Recommended PCB Layout for TPS6223X
Copyright ? 2009–2010, Texas Instruments Incorporated
25
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS622313DRYR | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter 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 |
| TPS622313DRYT | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter 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 |
| TPS622314DRYR | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter 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 |
| TPS622314DRYT | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter 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 |
| TPS622314TDRYRQ1 | 功能描述:直流/直流开关调节器 AC 3MHz,500mA SD Cnvrtr RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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