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參數(shù)資料
| 型號(hào)： | TPS62222DDC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23 |
| 中文描述： | 400毫安，1.25 MHz的，高效率，降壓型轉(zhuǎn)換器薄，SOT23封裝 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大小： | 464K |
| 代理商： | TPS62222DDC |
www.ti.com
PFM Mode at Light Load
Comparator High
Comparator Low
Comparator Low 2
PWM Mode at Medium to Full Load
1.6%
0.8%
V
O
DYNAMIC VOLTAGE POSITIONING
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.
DIGITAL SELF-CALIBRATION
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.
SOFT START
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.
LOW DROPOUT OPERATION 100% DUTY CYCLE
The TPS6222x offers a low input to output voltage difference, while still maintaining operation with the 100% duty
cycle mode. In this mode, the P-channel switch is constantly turned on. This is particularly useful in
battery-powered applications to achieve longest operation time by taking full advantage of the whole battery
voltage range. The minimum input voltage to maintain regulation, depending on the load current and output
voltage, can be calculated as
TPS62220, TPS62221, TPS62222
TPS62223, TPS62224
TPS62228, TPS62229
SLVS491C–SEPTEMBER 2003–REVISED SEPTEMBER 2004
DETAILED DESCRIPTION (continued)
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.
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS62222DDCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.8V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62222DDCRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.8V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62222DDCT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.8V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62222DDCTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.8V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62223DDCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.3V Out 400mA Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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