參數(shù)資料
型號(hào)： TPS63700DRC
廠商： Texas Instruments, Inc.
英文描述： DC-DC INVERTER
中文描述： 直流逆變器
文件頁(yè)數(shù)： 11/22頁(yè)
文件大?。?/td> 1029K
代理商： TPS63700DRC
www.ti.com
DETAILED DESCRIPTION
Power Conversion
The converter operates in a fixed-frequency, pulse-width-modulated control scheme. So, the on-time of the
switches varies depending on input-to-output voltage ratio and the load. During this on-time, the inductor
connected to the converter is charged with current. In the remaining time, the time period set by the fixed
operating frequency, the inductor discharges into the output capacitor via the rectifier diode. Usually, at higher
loads the inductor current is continuous. During light load, the inductor current of this converter can become
discontinuous. In this case, the control circuit of the controller output automatically takes care of these changing
conditions to always operate with an optimum control setup.
Control
The controller circuit of the converter is based on a fixed-frequency, multiple-feedforward controller topology.
Input voltage, output voltage, and voltage drop across the switch are monitored and forwarded to the regulator.
Changes in the operating conditions of the converter directly affect the duty cycle.
Enable
Applying GND signal at the EN pin disables the converter, where all internal circuitry is turned off. The device
now just consumes low shutdown current flowing into the VIN pin. The output load of the converter is also
disconnected from the battery as described in the following paragraph. Pulling the EN pin to V
IN
enables the
converter. Internal circuitry, necessary to operate the converter, is then turned on.
Load Disconnect
The device supports complete load disconnection when the converter is disabled. The converter turns off the
internal PMOS switch, thus no DC current path remains between load and input voltage source.
Soft Start
The converter has a soft-start function. When the converter is enabled, the implemented switch current limit
ramps up slowly to its nominal value. Soft start is implemented to limit the input current during start-up to avoid
high peak currents at the battery which could interfere with other systems connected to the same battery.
Output Overvoltage Protection
The converter has an implemented output overvoltage protection. The output voltage is limited to –19 V in case
the feedback connection from the output to the FB pin is open.
TPS63700
SLVS530–SEPTEMBER 2005
The TPS63700 is a dc-dc converter for negative output voltages using buck-boost topology. It operates with an
input voltage range of 2.7 V to 5.5 V and generates a negative output voltage down to –15 V. The output is
controlled by a fixed-frequency, pulse-width-modulated (PWM) regulator. In normal operation mode, the
converter operates at continuous conduction mode (CCM). At light loads it can enter discontinuous conduction
mode (DCM).
The error amplifier compares the voltage on FB pin with GND to generate an accurate and stable output voltage.
The error amplifier is internally compensated. At light loads, the converter operates in discontinuous conduction
mode (DCM).
If the load will be further decreased, the energy transmitted to the output capacitor can't be absorbed by the load
and would lead to an increase of the output voltage. In this case, the converter limits the output voltage increase
by skipping switch pulses.
Without soft start, uncontrolled input peak currents flow to charge up the output capacitors and to supply the load
during start-up. This would cause significant voltage drops across the series resistance of the battery and its
connections.
11
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參數(shù)描述
TPS63700DRCR 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Adj -15V Out Inv DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
TPS63700DRCRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj -15V Out Inv DC/DC 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
TPS63700DRCT 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj -15V Out Inv DC/DC 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
TPS63700DRCT 制造商:Texas Instruments 功能描述:IC DC/DC INV -15V 10-SON 制造商:Texas Instruments 功能描述:IC, DC/DC INV -15V 10-SON 制造商:Texas Instruments 功能描述:IC, DC/DC INV -15V 10-SON; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:-2V; Output Current:360mA; Voltage Regulator Case Style:SON; No. of Pins:10; Operating Temperature Min:-40C; Operating Temperature Max:85C; ;RoHS Compliant: Yes
TPS63700DRCT 制造商:Texas Instruments 功能描述:DC/DC CONVERTER 制造商:Texas Instruments 功能描述:IC, INVERTING DC/DC CONVERTER, SON-10
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