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参数资料
| 型号： | TPS62223DDCT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A SWITCHING REGULATOR, 1850 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | GREEN, PLASTIC, TSOT-23, 5 PIN |
| 文件页数： | 3/24页 |
| 文件大小： | 640K |
| 代理商： | TPS62223DDCT |
PFM Mode at Light Load
Comparator High
Comparator Low
Comparator Low 2
PWM Mode at Medium to Full Load
1.6%
0.8%
VO
DYNAMIC VOLTAGE POSITIONING
DIGITAL SELF-CALIBRATION
SOFT START
www.ti.com....................................................................................................................................... SLVS491E – SEPTEMBER 2003 – REVISED FEBRUARY 2009
Figure 14. Power-Save Mode Thresholds and Dynamic Voltage Positioning
The converter enters the fixed frequency PWM mode again as soon as the output voltage falls below the comp
low 2 threshold.
As described in the power-save mode operation sections and as detailed in Figure 14, the output voltage is
typically 0.8% above the nominal output voltage at light load currents, as the device is in power-save mode. This
gives additional headroom for the voltage drop during a load transient from light load to full load. During a load
transient from full load to light load, the voltage overshoot is also minimized due to active regulation by turning on
the N-channel rectifier switch.
In addition to the control circuit as shown in the block diagram, the TPS6222x series uses an internal digital
self-calibration of the output voltage to minimize DC load and line regulation. This method of self-calibration
allows simple internal loop compensation without the use of external components. The device monitors the
output voltage and as soon as the output voltage drops below typically 1.6% or exceeds typically 1.6% of Vout
the duty cycle will be adjusted in digital steps. As a result, the output voltage changes in digital steps either up or
down where one step is typically 1% of Vout. This results in virtually zero line and load regulation and keeps the
output voltage tolerance within ±3% overload and line variations.
The TPS6222x has an internal soft-start circuit that limits the inrush current during start-up. This prevents
possible voltage drops of the input voltage in case a battery or a high impedance power source is connected to
the input of the TPS6222x. The soft start is implemented as a digital circuit increasing the switch current in steps
of typically 83 mA, 167 mA, 335 mA and then the typical switch current limit of 670 mA. Therefore, the start-up
time mainly depends on the output capacitor and load current.
Copyright 2003–2009, Texas Instruments Incorporated
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| TPS62223DDCTG4 | 功能描述:直流/直流开关调节器 2.3V Out 400mA Step-Down Converter 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 |
| TPS62224DDCR | 功能描述:直流/直流开关调节器 1.6V Out 400mA Step-Down Converter 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 |
| TPS62224DDCRG4 | 功能描述:直流/直流开关调节器 1.6V Out 400mA Step-Down Converter 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 |
| TPS62224DDCT | 功能描述:直流/直流开关调节器 1.6V Out 400mA Step-Down Converter 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 |
| TPS62224DDCTG4 | 功能描述:直流/直流开关调节器 1.6V Out 400mA 95% Eff St-Down 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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