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參數資料
| 型號： | TPS53314RGFR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 1070 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 5 X 7 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數： | 11/29頁 |
| 文件大小： | 800K |
| 代理商： | TPS53314RGFR |
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IN
ON
OUT
V
t
V
÷
è
VFB
VREF
PWM
t
ON
t
OFF
UDG-10208
VFB
Compensation
Ramp
PWM
t
ON
t
OFF
VREF
UDG-10209
SLUSAK3
– MAY 2011
Adaptive On-Time D-CAP
Control
The TPS53314 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
.
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. (Leaving the resistance open sets the
switching frequency to 500 kHz.)
Table 2. Resistor and Switching Frequency
SWITCHING FREQUENCY
RESISTOR (RRF) CONNECTIONS
(kHz)
0
Ω to GND
250
187 k
Ω to GND
300
619 k
Ω to GND
400
Open
500
866 k
Ω to VREG
600
309 k
Ω to VREG
750
124 k
Ω to VREG
850
0
Ω to 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 the signal values 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 35. On-Time Control Without Ramp
Figure 36. On-Time Control With Ramp
Compensation
Copyright
2011, Texas Instruments Incorporated
19
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| TPS53314RGFT | 功能描述:直流/直流開關轉換器 4.5-25Vin,6A Step- Down 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 |
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| TPS53315RGFT | 功能描述:直流/直流開關調節器 12A Step-Down Reg 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 |
| TPS53316 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Efficiency, 5-A Step-Down Regulator with Integrated Switcher |
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