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參數(shù)資料
| 型號： | TPS54350MPWPREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 7.2 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 36/36頁 |
| 文件大小： | 1057K |
| 代理商： | TPS54350MPWPREP |
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5
A
Disabled
Enabled
RSS
CSS
Extending Slow Start Time
Switching Frequency (RT)
RT(kW) +
46000
s(kHz)–35.9
(4)
TPS54350-EP
SGLS308 – OCTOBER 2005
Figure 2. Interfacing to the ENA Pin
In applications that use large values of output capacitance, there may be a need to extend the slow start time to
prevent the startup current from tripping the current limit. The current limit circuit is designed to disable the high
side MOSFET and reset the internal voltage reference for a short amount of time when the high side MOSFET
current exceeds the current limit threshold. If the output capacitance and load current cause the startup current to
exceed the current limit threshold, the power supply output will not reach the desied output voltage. To extend
the slow start time and to reduce the startup current, an external resistor and capcitor can be added to the ENA
pin. The slow start capacitance is calculated using the following equation:
C
SS(F) = 5.55e-3 Tss(ms)
The RSS resistor must be 2 k and the slow start capacitor must be less than 0.47 F.
The TPS54350 has an internal oscillator that operates at twice the PWM switching frequency. The internal
oscillator frequency is controlled by the RT pin. Grounding the RT pin sets the PWM switching frequency to a
default frequency of 250 kHz. Floating the RT pin sets the PWM switching frequency to 500 kHz.
Connecting a resistor from RT to AGND sets the frequency according to the following equation (also see
The RT pin controls the SYNC pin functions. If the RT pin is floating or grounded, SYNC is an output. If the
switching frequency has been programmed using a resistor from RT to AGND, then SYNC functions as an input.
The internal voltage ramp charging current increases linearly with the set frequency and keeps the feed forward
modulator constant (Km = 8) regardless of the frequency set point.
SWITCHING FREQUENCY
SYNC PIN
RT PIN
250 kHz, internally set
Generates SYNC output signal
AGND
500 kHz, internally set
Generates SYNC output signal
Float
Externally set to 250 kHz to 700 kHz
Terminate to quiet ground with
R = 215 k
to 69 k
10-k
resistor.
Externally synchronized frequency
Synchronization signal
Use 110 k
when RT floats and 237 k when RT is grounded
and using the sync out signal of another TPS54350. Set RT
resistor equal to 90% to 110% of external synchronization
frequency.
9
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54350MPWPREPG4 | 功能描述:直流/直流開關調(diào)節(jié)器 4.5 to 20V Input,3A Step Down 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54350PWP | 功能描述:直流/直流開關調(diào)節(jié)器 4.5 to 20V Inp 3A Step-Down 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54350PWP | 制造商:Texas Instruments 功能描述:IC's |
| TPS54350PWPG4 | 功能描述:直流/直流開關調(diào)節(jié)器 4.5 to 20V Inp 3A Step-Down 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54350PWPR | 功能描述:開關變換器、穩(wěn)壓器與控制器 4.5 to 20V Inp 3A Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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