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參數資料
| 型號： | TPS53353DQPT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO22 |
| 封裝： | 5 X 6 MM, ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁數： | 8/25頁 |
| 文件大?。?/td> | 556K |
| 代理商： | TPS53353DQPT |
VFB
VREF
PWM
t
ON
t
OFF
UDG-10208
VFB
Compensation
Ramp
PWM
t
ON
t
OFF
VREF
UDG-10209
SLUSAK2
– AUGUST 2011
Adaptive On-Time D-CAP
Control and Frequency Selection
The TPS53353 does not have a dedicated oscillator to determine switching frequency. However, the device
operates with pseudo-constant frequency by feed-forwarding the input and output voltages into the on-time
one-shot timer. The adaptive on-time control adjusts the on-time to be inversely proportional to the input voltage
and proportional to the output voltage (tON ∝ VOUT/VIN).
This makes the switching frequency fairly constant in steady state conditions over a wide input voltage range.
The switching frequency is selectable from eight preset values by a resistor connected between the RF pin and
GND or between the RF pin and the VREG pin as shown in Table 2. (Maintaining open resistance sets the
switching frequency to 500 kHz.)
Table 2. Resistor and Switching Frequency
RESISTOR (RRF)
SWITCHING
CONNECTIONS
FREQUENCY
(fSW)
VALUE (k
Ω)
CONNECT TO
(kHz)
0
GND
250
187
GND
300
619
GND
400
OPEN
n/a
500
866
VREG
650
309
VREG
750
124
VREG
850
0
VREG
970
The off-time is modulated by a PWM comparator. The VFB node voltage (the mid-point of resistor divider) is
compared to the internal 0.6-V reference voltage added with a ramp signal. When both signals match, the PWM
comparator asserts a set signal to terminate the off time (turn off the low-side MOSFET and turn on high-side
MOSFET). The set signal is valid if the inductor current level is below the OCP threshold, otherwise the off time
is extended until the current level falls below the threshold.
Figure 36. On-Time Control Without Ramp
Figure 37. On-Time Control With Ramp
Compensation
16
Copyright
2011, Texas Instruments Incorporated
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS53353DQPT | 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV 20A QFN22 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, Output Voltage:5.5V, Output Current:20A, No. of Pins:22, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:- , RoHS Compliant: No |
| TPS53353EVM-744 | 功能描述:電源管理IC開發工具 HI-EFF,20A,SYNC BUCK CONVERTER RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS53355 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Efficiency 30-A Synchronous Buck Converter with Eco-modea?￠ |
| TPS53355DQPR | 功能描述:直流/直流開關調節器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS53355DQPT | 功能描述:直流/直流開關調節器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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