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| 型号： | TPS51461RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 3/31页 |
| 文件大小： | 1627K |
| 代理商： | TPS51461RGET |
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Time (ms)
V
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lt
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(V
)
Current
Feedback
t
ON
t
V
CS
V
COMP
UDG-10187
V
REF
www.ti.com
SLUSAD9 – DECEMBER 2010
APPLICATION INFORMATION
Functional Overview
The TPS51461 is a D-CAP+ mode adaptive on-time converter. The output voltage is set using a 2-bit DAC that
outputs a reference voltage in accordance with the code defined in Table 1. VID-on-the-fly transitions are
supported with the slew rate controlled by a single capacitor on the SLEW pin. Integrated high-side and low-side
FET supports output current to a maximum of 6-ADC. The converter automatically runs in discontinuous
conduction mode (DCM) to optimize light-load efficiency. Two switching frequency selections are provided, (700
kHz and 1 MHz) to enable optimization of the power chain for the cost, size and efficiency requirements of the
design.
In adaptive on-time converters, the controller varies the on-time as a function of input and output voltage to
maintain a nearly constant frequency during steady-state conditions. In conventional constant on-time converters,
each cycle begins when the output voltage crosses to a fixed reference level. However, in the TPS51461, the
cycle begins when the current feedback reaches an error voltage level which is the amplified difference between
the reference voltage and the feedback voltage.
PWM Operation
Referring to Figure 3, in steady state, continuous conduction mode, the converter operates in the following way.
Starting with the condition that the top FET is off and the bottom FET is on, the current feedback (VCS) is higher
than the error amplifier output (VCOMP). VCS falls until it hits VCOMP, which contains a component of the output
ripple voltage. VCS is not directly accessible by measuring signals on pins of TPS51461. The PWM comparator
senses where the two waveforms cross and triggers the on-time generator.
Figure 3. D-CAP+ Mode Basic Waveforms
The current feedback is an amplified and filtered version of the voltage between PGND and SW during low-side
FET on-time. The TPS51461 also provides a single-ended differential voltage (VOUT) feedback to increase the
system accuracy and reduce the dependence of circuit performance on layout.
Copyright 2010, Texas Instruments Incorporated
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Product Folder Link(s): TPS51461
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51462 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAPa?￠ Mode Synchronous Step-Down Integrated FETs Converter With 2-Bit VID |
| TPS51462RGER | 功能描述:开关变换器、稳压器与控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS51462RGET | 功能描述:开关变换器、稳压器与控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS51463 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAP+? Mode Synchronous Step-Down Integrated FETs Converter |
| TPS51463RGER | 功能描述:直流/直流开关转换器 3.3V/5Vin,Sync SD Integr FET 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 |
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