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參數(shù)資料
| 型號： | TPS6205 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 800-mA SYNCHRONOUS STEP-DOWN CONVERTER |
| 中文描述： | 800毫安同步降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 432K |
| 代理商： | TPS6205 |
www.ti.com
, nominal
VO
0.8%
1.6%
–1.6%
t
TPS62050, TPS62051
TPS62052, TPS62054, TPS62056
SLVS432D–SEPTEMBER 2002–REVISED OCTOBER 2003
APPLICATION INFORMATION (continued)
Feedforward Capacitor
The feedforward capacitor, C
(ff)
shown in Figure 20, improves the performance in SKIP mode. The comparator is
faster, therefore, there is less voltage ripple at the output in SKIP mode. Use the values listed in Table 1. Larger
values decrease stability in fixed frequency PWM mode. If the TPS6205x is only operated in fixed frequency
PWM mode, the feedforward capacitor is not needed.
Figure 16. Power-Save Mode Output Voltage Thresholds
The converter enters the fixed frequency PWM mode again as soon as the output voltage falls below the comp
low 2 threshold set to 1.6% below V
O
, nominal.
Soft-Start
The TPS6205x has an internal soft-start circuit that limits the inrush current during start-up. This prevents
possible voltage drops of the input voltage if a battery or a high impedance power source is connected to the
input of the TPS6205x.
The soft-start is implemented as a digital circuit increasing the switch current in steps of 200 mA, 400 mA, 800
mA and then the typical switch current limit of 1.2 A. Therefore the start-up time mainly depends on the output
capacitor and load current. Typical start-up time with a 22-μF output capacitor and a 200-mA load current is 1
ms.
100% Duty Cycle Low Dropout Operation
The TPS6205x offers the lowest possible input to output voltage difference while still maintaining operation with
the use of 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, i.e. The minimum input voltage to maintain regulation depends on the load
current and output voltage and can be calculated as:
11
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| TPS62050DGS | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA 10V Vin 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 |
| TPS62050DGSG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA 10V Vin 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 |
| TPS62050DGSR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA 10V Vin 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 |
| TPS62050DGSR | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
| TPS62050DGSRG4 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Adj 800mA 10V Vin Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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