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| 型号： | TPS61261DRVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 2 MM, SON-6 |
| 文件页数： | 4/19页 |
| 文件大小： | 833K |
| 代理商： | TPS61261DRVT |
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TPS61260
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TPS61260, TPS61261
SLVSA99
– MAY 2011
APPLICATION INFORMATION
PROGRAMMING THE OUTPUT VOLTAGE
Within the TPS6126x family there are fixed and adjustable output voltage versions available. To properly
configure the fixed output voltage devices, the FB pin is used to sense the output voltage. This means that it
must be connected directly to VOUT. At the adjustable output voltage versions, an external resistor divider is
used to adjust the output voltage. The resistor divider must be connected between VOUT, FB and GND. When
the output voltage is regulated properly, the typical value of the voltage at the FB pin is 500 mV. The maximum
recommended value for the output voltage is 4.0 V. The current through the resistive divider should be about 100
times greater than the current into the FB pin. The typical current into the FB pin is 0.01
μA, and the voltage
across the resistor between FB and GND, R2, is typically 500 mV. Based on these two values, the recommended
value for R2 should be lower than 500 k
, in order to set the divider current at 1 μA or higher. It is also
recommended to keep the total value for the resistor divider, R1 + R2, in the range of 1 M
. From that, the value
of the resistor connected between VOUT and FB, R1, depending on the needed output voltage (VOUT), can be
calculated using Equation 1:
(1)
Figure 19. Typical Application Circuit for Adjustable Output Voltage Option
PROGRAMMING THE OUTPUT CURRENT
The devices of the TPS6126x family also support average output current regulation. An external resistor is used
to program the average output current. The resistor must be connected between RI and GND. When the average
output current is regulated properly, the typical value of the voltage at the RI pin is 400 mV. The maximum
recommended value for the regulated average output current is 100 mA. The value of the resistor R3 should be
between 2 k
Ω and 20 kΩ. It can be calculated, depending on the needed average output current (IOUT), using
(2)
Accurate regulation of the average output current only is possible if the inductor current is continuous. Please
check the INDUCTOR SELECTION section to calculate the required parameters for selecting an appropriate
inductor.
INDUCTOR SELECTION
To properly configure the TPS6126x devices, an inductor must be connected between the supply voltage and pin
L. To estimate the minimum inductance value for accurate average output current regulation, Equation 3 can be
used.
(3)
12
Copyright
2011, Texas Instruments Incorporated
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| TPS61280YFFT | 功能描述:Boost Switching Regulator IC Positive Programmable 3.15V, 3.35V 1 Output 2.475A (Switch) 16-UFBGA, DSBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:升压 输出配置:正 拓扑:升压 输出类型:可编程 输出数:1 电压 - 输入（最小值）:2.3V 电压 - 输入（最大值）:4.85V 电压 - 输出（最小值/固定）:3.15V，3.35V 电压 - 输出（最大值）:- 电流 - 输出:2.475A（开关） 频率 - 开关:2.3MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:16-UFBGA，DSBGA 供应商器件封装:16-DSBGA（1.56x1.56） 标准包装:1 |
| TPS61281AYFFR | 功能描述:Boost Switching Regulator IC Positive Programmable 3.15V, 3.35V 1 Output 2.475A (Switch) 16-UFBGA, DSBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:升压 输出配置:正 拓扑:升压 输出类型:可编程 输出数:1 电压 - 输入（最小值）:2.3V 电压 - 输入（最大值）:4.85V 电压 - 输出（最小值/固定）:3.15V，3.35V 电压 - 输出（最大值）:- 电流 - 输出:2.475A（开关） 频率 - 开关:2.3MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:16-UFBGA，DSBGA 供应商器件封装:16-DSBGA 标准包装:1 |
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