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參數(shù)資料
| 型號： | TPS61170DRV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1.2A High Voltage Boost Converter in 2x2mm2 QFN Package |
| 中文描述： | 1.2A的高電壓升壓轉(zhuǎn)換器2x2mm2 QFN封裝 |
| 文件頁數(shù)： | 8/22頁 |
| 文件大小： | 405K |
| 代理商： | TPS61170DRV |
www.ti.com
DETAILED DESCRIPTION
OPERATION
The TPS61170 integrates a 40-V low side FET for up to 38-V output voltages. The device regulates the output
with current mode PWM (pulse width modulation) control. The switching frequency of PWM is fixed at 1.2MHz.
The PWM control circuitry turns on the switch at the beginning of each switching cycle. The input voltage is
applied across the inductor and stores the energy as inductor current ramps up. During this portion of the
switching cycle, the load current is provided by the output capacitor. When the inductor current rises to the
threshold set by the error amplifier output, the power switch turns off and the external Schottky diode is forward
biased. The inductor transfers stored energy to replenish the output capacitor and supply the load current. This
operation repeats in every switching cycle. As shown in the block diagram, the duty cycle of the converter is
determined by the PWM control comparator which compares the error amplifier output and the current signal.
SOFT START-UP
Soft-start circuitry is integrated into the IC to avoid a high inrush current during start-up. After the device is
enabled by a logic high signal on the CTRL pin, the FB pin reference voltage ramps up in 32 steps, each step
takes 213
μ
s. This ensures that the output voltage rises slowly to reduce inrush current. Additionally, for the first
5msec after the COMP voltage ramps, the current limit of the PWM switch is set to half of the normal current limit
spec. Therefore, during this period the input current is kept below 700mA (typical). See the start-up waveform for
a typical example,
Figure 11
.
OVERCURRENT PROTECTION
TPS61170 has a cycle-by-cycle overcurrent limit feature that turns off the power switch once the inductor current
reaches the overcurrent limit. The PWM circuitry resets itself at the beginning of the next switch cycle. During an
over-current event, this results in a decrease of output voltage with respect to load. The current limit threshold as
well as input voltage, output voltage, switching frequency and inductor value determine the maximum available
output current. Larger inductor values increases the current output capability because of the reduced current
ripple. See the
APPLICATION INFORMATION
section for the output current calculation.
UNDERVOLTAGE LOCKOUT (UVLO)
An undervoltage lockout prevents mis-operation of the device at input voltages below typical 2.2V. When the
input voltage is below the undervoltage threshold, the device remains off and the internal switch FET is turned
off. The undervoltage lockout threshold is set below minimum operating voltage of 3V to avoid any transient VIN
dip triggering the UVLO and causing the device to reset. For the input voltages between UVLO threshold and 3V,
the device maintains its operation, but the specifications are not ensured.
THERMAL SHUTDOWN
An internal thermal shutdown turns off the device when the typical junction temperature of 160
°
C is exceeded.
The IC restarts when the junction temperature drops by 15
°
C.
ENABLE AND SHUTDOWN
The TPS61170 enters shutdown when the CTRL voltage is less than 0.4V for more than 2.5ms. In shutdown, the
input supply current for the device is less than 1
μ
A (max). The CTRL pin has an internal 800k
pull down
resistor to disable the device when the pin is left unconnected.
TPS61170
SLVS789–NOVEMBER 2007
A ramp signal from oscillator is added to the current ramp. This
slope
compensation is to avoid sub-harmonic
oscillation that is intrinsic to the current mode control at duty cycle higher than 50%. The feedback loop regulates
the FB pin to a reference voltage through an error amplifier. The output of the error amplifier is connected to the
COMP pin. An external RC compensation network is connected to the COMP pin to optimize the feedback loop
for stability and transient response.
8
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s):
TPS61170
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS61170DRVR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost Conv 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 |
| TPS61170DRVRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost 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 |
| TPS61170DRVT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost Conv 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 |
| TPS61170DRVT | 制造商:Texas Instruments 功能描述:Voltage Regulators |
| TPS61170DRVTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2A Sw Hi Vltg Boost 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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