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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 |
| 文件頁數(shù)： | 15/22頁 |
| 文件大?。?/td> | 1029K |
| 代理商： | TPS63700DRC |
www.ti.com
Capacitor Selection
Input Capacitor
At least a 10-
μ
F ceramic input capacitor is recommended for a good transient behavior of the regulator, and EMI
behavior of the total power supply circuit.
Output Capacitors
Cmin
IOUT
VOUT
fS
V
VOUT
VIN
(6)
VESR
IOUT
RESR
(7)
Stabilizing the Control Loop
TPS63700
SLVS530–SEPTEMBER 2005
APPLICATION INFORMATION (continued)
The following inductor series from different suppliers have been tested with the TPS63700 converter:
List of Inductors
Output Voltage
Vendor
SUGGESTED INDUCTOR
VLF4012 4.7
μ
H
SLF6025-4.7
μ
H
LPS4018 4.7
μ
H
LPS3015 4.7
μ
H
CDRH5D18 10
μ
H
MOS6020 10
μ
H
–5V
TDK
–5V
Coilcraft
–12V
–12V
Sumida
Coilcraft
One of the major parameters necessary to define the capacitance value of the output capacitor is the maximum
allowed output voltage ripple of the converter. This ripple is determined by two parameters of the capacitor, the
capacitance and the ESR. It is possible to calculate the minimum capacitance needed for the defined ripple,
supposing that the ESR is zero, by using
Equation 6
for the inverting converter output capacitor.
Parameter
f
is the switching frequency and
V
is the maximum allowed ripple.
With a chosen ripple voltage in the range of 10 mV, a minimum capacitance of 12
μ
F is needed. The total ripple
is larger due to the ESR of the output capacitor. This additional component of the ripple can be calculated using
Equation 7
.
An additional ripple of 2 mV is the result of using a typical ceramic capacitor with an ESR in a 10-m
range. The
total ripple is the sum of the ripple caused by the capacitance, and the ripple caused by the ESR of the capacitor.
In this example, the total ripple is 12 mV. Additional ripple is caused by load transients. When the load current
increases rapidly, the output capacitor must provide the additional current until the inductor current has been
increased by the control loop by setting a higher on-time at the main switch (duty cycle). The higher duty cycle
results in longer inductor charging periods. But the rate of increase of the inductor current is also limited by the
inductance itself. When the load current decreases rapidly, the output capacitor needs to store the excessive
energy (stored in the inductor) until the regulator has decreased the inductor current by reducing the duty cycle.
The recommendation is to use higher capacitance values, as the previous calculations show.
Feedback Divider
To speed up the control loop, a feedforward capacitor of 10 pF is recommended in the feedback divider, parallel
to R3.
To avoid coupling noise into the control loop from the feedforward capacitor, the feedforward effect can be
bandwidth-limited by adding series resistor R4. A value in the range of 100 k
is suitable. The higher the
resistance, the lower the noise coupled into the control loop system.
15
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相關(guān)代理商/技術(shù)參數(shù) |
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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