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參數資料
| 型號： | TPS51317RGBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 3.50 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數： | 2/28頁 |
| 文件大小： | 1000K |
| 代理商： | TPS51317RGBR |
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Time (ms)
V
o
lt
a
g
e
(V
)
Current
Feedback
t
ON
t
V
CS
V
COMP
UDG-10187
V
REF
SLUSAH9
– MARCH 2011
APPLICATION INFORMATION
Functional Overview
The TPS51317 is a D-CAP+
mode adaptive on-time converter. 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. Multiple switching frequencies are provided to enable optimization of the
power chain for the cost, size and efficiency requirements of the design (see Table 4).
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 TPS51317, 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 TPS51317. 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 TPS51317 also provides a single-ended differential voltage (VOUT) feedback to increase the
system accuracy and reduce the dependence of circuit performance on layout.
10
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS51317
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS51317RGBT | 功能描述:直流/直流開關轉換器 3.3V/5Vin,6A,DCAP Mode Sync Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS51362RVER | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
| TPS51362RVET | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
| TPS51363 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:22-V Input, 8-A or 10-A Converter With Integrated FET |
| TPS51363RVER | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 3V to 22V 28-Pin VQFN EP T/R 制造商:Texas Instruments 功能描述:IC REG BCK SYNC ADJ 10/8A 28VQFN |
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