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參數(shù)資料
| 型號： | TPS62201DBVR |
| 英文描述： | DC to DC Converter |
| 中文描述： | DC至DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/23頁 |
| 文件大?。?/td> | 358K |
| 代理商： | TPS62201DBVR |
SLUS446B – MAY 2000 – REVISED DECEMBER 2000
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
shutdown and synchronization
The TPS6210x family incorporates a dual function shutdown and synchronization pin. Pulsing the SD/SYNC
pin higher than 1 V forces the internal oscillator to reset, allowing synchronization to an external signal source.
It is recommended that the part not be synchronized higher than two times its nominal operating frequency. The
reason for this is that synchronizing to a higher frequency causes the internal saw-tooth voltage to have less
amplitude. Since this is the signal that is compared to the error-amplifier output to determine the duty cycle, the
reduction in amplitude causes a corresponding increase in PWM gain as well as increased susceptibility to
noise. Doubling the operating frequency through synchronization effectively cuts the saw-tooth amplitude in
half, doubling the PWM gain.
Bringing the SD/SYNC pin high and holding it for more than 20
μ
s forces the chip to enter a shutdown state.
This causes almost all sections of the chip to enter a dormant state to conserve power. Bringing this pin low
again allows the chip to resume operation, starting with a full soft-start cycle.
This pin
must not
be allowed to float, since there are no internal pulldown resistors. Floating this pin could cause
the device to operate erratically.
error amplifier
The internal error amplifier has a unity gain frequency of 3 MHz (typ). When designing a compensation network
for this chip, the response of the error amplifier may be a limiting consideration. This is especially true with the
1-MHz and 2-MHz switching frequencies. The phase and gain characteristics of the error amplifier are shown
in Figure 1.
Due to the method of sensing voltage thresholds in the variable-frequency mode, it is recommended that the
compensation loop use integral compensation (no dc path from the COMP pin to the FB pin) if the chip is allowed
to automatically switch between constant- and variable-frequency modes of operation. The reason for this is
to avoid dc offsets creeping into the sense point and changing the nominal output voltage in the
variable-frequency mode.
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| TPS62201DBVRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 300mA Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62201DBVT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 300mA Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62201DBVTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 300mA Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62202DBVR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.8V Out Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62202DBVRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.8V Out Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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