- 您现在的位置：买卖IC网 > PDF目录69517 > TPS62067DSGR (TEXAS INSTRUMENTS INC) 2 A SWITCHING REGULATOR, 3400 kHz SWITCHING FREQ-MAX, PDSO8 PDF资料下载
参数资料
| 型号： | TPS62067DSGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 3400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 2 MM, 0.75 MM HEIGHT, GREEN, PLASTIC, WSON-8 |
| 文件页数： | 11/28页 |
| 文件大小： | 1208K |
| 代理商： | TPS62067DSGR |
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页当前第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页第25页第26页第27页第28页
I
RMSCout + Vout
1 *
Vout
Vin
L
1
2
3
www.ti.com
SLVS833A – MARCH 2010 – REVISED MAY 2010
In case additional ceramic capacitors in the supplied system are connected to the output of the DC/DC converter,
the output capacitor COUT need to be decreased in order not to exceed the recommended effective capacitance
range. In this case a loop stability analysis must be performed as described later.
At nominal load current, the device operates in PWM mode and the RMS ripple current is calculated as:
(3)
Input Capacitor Selection
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high input
voltage spikes. For most applications a 10F ceramic capacitor is recommended. The input capacitor can be
increased without any limit for better input voltage filtering.
Take care when using only small ceramic input capacitors. When a ceramic capacitor is used at the input and the
power is being supplied through long wires, such as from a wall adapter, a load step at the output or VIN step on
the input can induce ringing at the VIN pin. This ringing can couple to the output and be mistaken as loop
instability or could even damage the part by exceeding the maximum ratings.
Table 3. List of Capacitors
CAPACITANCE
TYPE
SIZE [ mm3]
SUPPLIER
10mF
GRM188R60J106M
0603: 1.6 x 0.8 x 0.8
Murata
22mF
GRM188R60G226M
0603: 1.6 x 0.8 x 0.8
Murata
22F
CL10A226MQ8NRNC
0603: 1.6 x 0.8 x 0.8
Samsung
10F
CL10A106MQ8NRNC
0603: 1.6 x 0.8 x 0.8
Samsung
CHECKING LOOP STABILITY
The first step of circuit and stability evaluation is to look from a steady-state perspective at the following signal
Switching node, SW
Inductor current, IL
Output ripple voltage, VOUT(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 wrong L-C output filter
combinations. 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. VOUT immediately shifts by an amount equal to
ΔI(LOAD) x ESR, where ESR is the effective series resistance of COUT. ΔI(LOAD) begins to charge or discharge CO
generating a feedback error signal used by the regulator to return VOUT to its steady-state value. The results are
most easily interpreted when the device operates in PWM mode at medium to high load currents.
During this recovery time, VOUT can be monitored for settling time, overshoot, or ringing; that helps evaluate
stability of the converter. Without any ringing, the loop has usually more than 45° of phase margin.
Copyright 2010, Texas Instruments Incorporated
19
相关PDF资料 |
PDF描述 |
|---|---|
| TPS62110MRSATEP | 2.4 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PQCC16 |
| TPS62112MRSATEP | 2.4 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PQCC16 |
| TPS62120DCN | SWITCHING REGULATOR, PDSO8 |
| TPS62122DRVT | SWITCHING REGULATOR, PDSO6 |
| TPS62201DBVTG4 | 0.67 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS62067DSGT | 功能描述:直流/直流开关转换器 3MHz 2A 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 |
| TPS62067DSGT | 制造商:Texas Instruments 功能描述:VOLTAGE REGULATOR IC 制造商:Texas Instruments 功能描述:IC, STEP-DOWN CONVERTER, WSON-8 |
| TPS62067QDSGRQ1 | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 2A 8-WFDFN Exposed Pad 制造商:texas instruments 系列:汽车级，AEC-Q100 包装:剪切带（CT） 零件状态:在售 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:2.9V 电压 - 输入（最大值）:6V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:6V 电流 - 输出:2A 频率 - 开关:3MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商器件封装:8-WSON（2x2） 标准包装:1 |
| TPS62080ADSGR | 功能描述:直流/直流开关转换器 1.2A High Eff 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 |
| TPS62080ADSGT | 功能描述:直流/直流开关转换器 1.2A High Eff 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 |
发布紧急采购，3分钟左右您将得到回复。